├── .gitignore
├── LICENSE.txt
├── README.md
├── app
├── .gitignore
├── build.gradle
├── proguard-rules.pro
└── src
│ ├── androidTest
│ └── java
│ │ └── ru
│ │ └── astrocode
│ │ └── sample
│ │ └── ExampleInstrumentedTest.java
│ ├── main
│ ├── AndroidManifest.xml
│ ├── java
│ │ └── ru
│ │ │ └── astrocode
│ │ │ └── sample
│ │ │ └── ActivityMain.java
│ └── res
│ │ ├── drawable-v24
│ │ └── ic_launcher_foreground.xml
│ │ ├── drawable
│ │ ├── ic_close.xml
│ │ ├── ic_launcher_background.xml
│ │ ├── shape_chips.xml
│ │ └── shape_chips_close_btn.xml
│ │ ├── layout
│ │ └── activity_main.xml
│ │ ├── mipmap-anydpi-v26
│ │ ├── ic_launcher.xml
│ │ └── ic_launcher_round.xml
│ │ ├── mipmap-hdpi
│ │ ├── ic_launcher.png
│ │ └── ic_launcher_round.png
│ │ ├── mipmap-mdpi
│ │ ├── ic_launcher.png
│ │ └── ic_launcher_round.png
│ │ ├── mipmap-xhdpi
│ │ ├── ic_launcher.png
│ │ └── ic_launcher_round.png
│ │ ├── mipmap-xxhdpi
│ │ ├── ic_launcher.png
│ │ └── ic_launcher_round.png
│ │ ├── mipmap-xxxhdpi
│ │ ├── ic_launcher.png
│ │ └── ic_launcher_round.png
│ │ └── values
│ │ ├── colors.xml
│ │ ├── dimens.xml
│ │ ├── strings.xml
│ │ └── styles.xml
│ └── test
│ └── java
│ └── ru
│ └── astrocode
│ └── sample
│ └── ExampleUnitTest.java
├── build.gradle
├── flow-layout-manager
├── .gitignore
├── build.gradle
├── proguard-rules.pro
└── src
│ ├── androidTest
│ └── java
│ │ └── ru
│ │ └── astrocode
│ │ └── flm
│ │ └── ExampleInstrumentedTest.java
│ ├── main
│ ├── AndroidManifest.xml
│ ├── java
│ │ └── ru
│ │ │ └── astrocode
│ │ │ └── flm
│ │ │ └── FLMFlowLayoutManager.java
│ └── res
│ │ └── values
│ │ └── strings.xml
│ └── test
│ └── java
│ └── ru
│ └── astrocode
│ └── flm
│ └── ExampleUnitTest.java
├── flow_layout_manager_vertical.gif
├── gradle.properties
├── gradle
└── wrapper
│ └── gradle-wrapper.properties
└── settings.gradle
/.gitignore:
--------------------------------------------------------------------------------
1 | *.iml
2 | .gradle
3 | /local.properties
4 |
5 | /.idea/modules.xml
6 | /.idea/libraries/
7 | /.idea/gradle.xml
8 | /.idea/workspace.xml
9 | /.idea/tasks.xml
10 | /.idea/.name
11 | /.idea/compiler.xml
12 | /.idea/copyright/profiles_settings.xml
13 | /.idea/encodings.xml
14 | /.idea/misc.xml
15 | /.idea/modules.xml
16 | /.idea/scopes/scope_settings.xml
17 | /.idea/vcs.xml
18 | /.idea/runConfigurations.xml
19 | /.idea/codeStyles/Project.xml
20 | /.idea/caches/build_file_checksums.ser
21 | /.idea/markdown-navigator.xml
22 | /.idea/markdown-navigator/profiles_settings.xml
23 | *.iml
24 | .DS_Store
25 | /build
26 | /captures
27 | .externalNativeBuild
28 |
--------------------------------------------------------------------------------
/LICENSE.txt:
--------------------------------------------------------------------------------
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/README.md:
--------------------------------------------------------------------------------
1 | # FlowLayoutManager
2 |
3 | Flow layout manager for RecyclerView.Supports **API 10(Android 2.3)** and above.
4 |
5 | 
6 |
7 | ## Features
8 |
9 | 1. Vertical/Horizontal orientation;
10 | 2. Custom gravity;
11 | 3. Maximum items in line;
12 | 4. Spaces between items and/or lines;
13 | 5. Stores position during orientation changes;
14 | 6. Scroll/Smooth scroll.
15 |
16 | ## Usage
17 |
18 | Instead standard layout manager use FLMFlowLayoutManager:
19 |
20 | ...
21 |
22 | FLMFlowLayoutManager layoutManager = new FLMFlowLayoutManager(FLMFlowLayoutManager.VERTICAL);
23 |
24 | RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
25 | recyclerView.setLayoutManager(layoutManager);
26 | recyclerView.setAdapter(new Adapter(this));
27 |
28 | ...
29 |
30 | To change gravity of the layout manager:
31 |
32 | ...
33 |
34 | layoutManager.setGravity(Gravity.START|Gravity.CENTER_HORIZONTAL);
35 |
36 | ...
37 |
38 | To change maximum items count in line:
39 |
40 | ...
41 |
42 | layoutManager.setMaxItemsInLine(4);
43 |
44 | ...
45 |
46 | To change spaces between items and lines:
47 |
48 | ...
49 |
50 | layoutManager.setSpacingBetweenItems(10);
51 | layoutManager.setSpacingBetweenLines(10);
52 |
53 | ...
54 |
55 | ## License
56 |
57 | Copyright 2018 Astrocode011235813
58 |
59 | Licensed under the Apache License, Version 2.0 (the "License");
60 | you may not use this file except in compliance with the License.
61 | You may obtain a copy of the License at
62 |
63 | http://www.apache.org/licenses/LICENSE-2.0
64 |
65 | Unless required by applicable law or agreed to in writing, software
66 | distributed under the License is distributed on an "AS IS" BASIS,
67 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
68 | See the License for the specific language governing permissions and
69 | limitations under the License.
--------------------------------------------------------------------------------
/app/.gitignore:
--------------------------------------------------------------------------------
1 | /build
2 |
--------------------------------------------------------------------------------
/app/build.gradle:
--------------------------------------------------------------------------------
1 | apply plugin: 'com.android.application'
2 |
3 | android {
4 | compileSdkVersion 25
5 | defaultConfig {
6 | applicationId "ru.astrocode.sample"
7 | minSdkVersion 10
8 | targetSdkVersion 25
9 | versionCode 1
10 | versionName "1.0"
11 | testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
12 | vectorDrawables.useSupportLibrary = true
13 |
14 | }
15 | buildTypes {
16 | release {
17 | minifyEnabled false
18 | proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
19 | }
20 | }
21 | buildToolsVersion '27.0.3'
22 | productFlavors {
23 | }
24 | }
25 |
26 | dependencies {
27 | implementation fileTree(include: ['*.jar'], dir: 'libs')
28 | implementation 'com.android.support.constraint:constraint-layout:1.1.1'
29 | testImplementation 'junit:junit:4.12'
30 | androidTestImplementation 'com.android.support.test:runner:1.0.2'
31 | androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
32 | implementation project(':flow-layout-manager')
33 | implementation 'com.android.support:appcompat-v7:25.4.0'
34 | implementation 'com.android.support:recyclerview-v7:25.4.0'
35 | implementation 'com.android.support:design:25.4.0'
36 | }
37 |
--------------------------------------------------------------------------------
/app/proguard-rules.pro:
--------------------------------------------------------------------------------
1 | # Add project specific ProGuard rules here.
2 | # You can control the set of applied configuration files using the
3 | # proguardFiles setting in build.gradle.
4 | #
5 | # For more details, see
6 | # http://developer.android.com/guide/developing/tools/proguard.html
7 |
8 | # If your project uses WebView with JS, uncomment the following
9 | # and specify the fully qualified class name to the JavaScript interface
10 | # class:
11 | #-keepclassmembers class fqcn.of.javascript.interface.for.webview {
12 | # public *;
13 | #}
14 |
15 | # Uncomment this to preserve the line number information for
16 | # debugging stack traces.
17 | #-keepattributes SourceFile,LineNumberTable
18 |
19 | # If you keep the line number information, uncomment this to
20 | # hide the original source file name.
21 | #-renamesourcefileattribute SourceFile
22 |
--------------------------------------------------------------------------------
/app/src/androidTest/java/ru/astrocode/sample/ExampleInstrumentedTest.java:
--------------------------------------------------------------------------------
1 | package ru.astrocode.sample;
2 |
3 | import android.content.Context;
4 | import android.support.test.InstrumentationRegistry;
5 | import android.support.test.runner.AndroidJUnit4;
6 |
7 | import org.junit.Test;
8 | import org.junit.runner.RunWith;
9 |
10 | import static org.junit.Assert.assertEquals;
11 |
12 | /**
13 | * Instrumented test, which will execute on an Android device.
14 | *
15 | * @see Testing documentation
16 | */
17 | @RunWith(AndroidJUnit4.class)
18 | public class ExampleInstrumentedTest {
19 | @Test
20 | public void useAppContext() {
21 | // Context of the app under test.
22 | Context appContext = InstrumentationRegistry.getTargetContext();
23 |
24 | assertEquals("ru.astrocode.sample", appContext.getPackageName());
25 | }
26 | }
27 |
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/app/src/main/AndroidManifest.xml:
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1 |
2 |
4 |
5 |
12 |
13 |
14 |
15 |
16 |
17 |
18 |
19 |
20 |
21 |
--------------------------------------------------------------------------------
/app/src/main/java/ru/astrocode/sample/ActivityMain.java:
--------------------------------------------------------------------------------
1 | package ru.astrocode.sample;
2 |
3 | import android.content.Context;
4 | import android.graphics.Color;
5 | import android.os.Bundle;
6 | import android.support.annotation.NonNull;
7 | import android.support.constraint.ConstraintLayout;
8 | import android.support.v7.app.AppCompatActivity;
9 | import android.support.v7.widget.AppCompatImageButton;
10 | import android.support.v7.widget.RecyclerView;
11 | import android.util.TypedValue;
12 | import android.view.Gravity;
13 | import android.view.View;
14 | import android.view.ViewGroup;
15 | import android.widget.ImageButton;
16 | import android.widget.ImageView;
17 | import android.widget.TextView;
18 |
19 | import java.util.ArrayList;
20 | import java.util.Arrays;
21 |
22 | import ru.astrocode.flm.FLMFlowLayoutManager;
23 |
24 | public class ActivityMain extends AppCompatActivity {
25 |
26 | @Override
27 | protected void onCreate(Bundle savedInstanceState) {
28 | super.onCreate(savedInstanceState);
29 | setContentView(R.layout.activity_main);
30 |
31 | int item_spacing = getResources().getDimensionPixelSize(R.dimen.spacing_between_items);
32 | int lines_spacing = getResources().getDimensionPixelSize(R.dimen.spacing_between_lines);
33 |
34 | final Adapter adapter = new Adapter(this);
35 | final FLMFlowLayoutManager layoutManager =
36 | new FLMFlowLayoutManager(FLMFlowLayoutManager.VERTICAL,Gravity.CENTER,item_spacing,lines_spacing);
37 |
38 | final RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
39 | recyclerView.setLayoutManager(layoutManager);
40 | recyclerView.setAdapter(adapter);
41 | }
42 |
43 | private final class Adapter extends RecyclerView.Adapter {
44 | private final static int sBtnCloseSize = 16;
45 | private final static int sBtnCloseLeftMargin = 5;
46 |
47 | private final Context mContext;
48 | private final int mBtnCloseSize,mBtnCloseLeftMargin;
49 |
50 | private ArrayList mData;
51 |
52 |
53 | public Adapter(Context context) {
54 | mContext = context;
55 | mData = new ArrayList<>(Arrays.asList(context.getResources().getStringArray(R.array.Countries)));
56 | mBtnCloseSize = Math.round(sBtnCloseSize*context.getResources().getDisplayMetrics().density);
57 | mBtnCloseLeftMargin = Math.round(sBtnCloseLeftMargin*context.getResources().getDisplayMetrics().density);
58 | }
59 |
60 | @NonNull
61 | @Override
62 | public Adapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
63 |
64 | ConstraintLayout view = new ConstraintLayout(mContext);
65 | view.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
66 | ViewGroup.LayoutParams.WRAP_CONTENT));
67 | view.setBackgroundResource(R.drawable.shape_chips);
68 |
69 | TextView title = new TextView(mContext);
70 | title.setGravity(Gravity.CENTER);
71 | title.setTextColor(Color.BLACK);
72 | title.setTextSize(TypedValue.COMPLEX_UNIT_SP,12);
73 | title.setId(R.id.textView);
74 |
75 | ConstraintLayout.LayoutParams lp = new ConstraintLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
76 | ViewGroup.LayoutParams.WRAP_CONTENT);
77 |
78 | view.addView(title,lp);
79 |
80 | AppCompatImageButton imageButton = new AppCompatImageButton(mContext);
81 | imageButton.setBackgroundResource(R.drawable.shape_chips_close_btn);
82 | imageButton.setImageResource(R.drawable.ic_close);
83 | imageButton.setScaleType(ImageView.ScaleType.FIT_XY);
84 | imageButton.setId(R.id.imageButton);
85 |
86 | lp = new ConstraintLayout.LayoutParams(mBtnCloseSize,mBtnCloseSize);
87 | lp.leftMargin = mBtnCloseLeftMargin;
88 | lp.leftToRight = R.id.textView;
89 |
90 | view.addView(imageButton,lp);
91 |
92 | return new ViewHolder(view);
93 | }
94 |
95 | @Override
96 | public void onBindViewHolder(@NonNull Adapter.ViewHolder holder, int position) {
97 | holder.mText.setText(mData.get(position));
98 | }
99 |
100 | @Override
101 | public int getItemCount() {
102 | return mData.size();
103 | }
104 |
105 | final class ViewHolder extends RecyclerView.ViewHolder {
106 | TextView mText;
107 | ImageButton mDeleteButton;
108 |
109 | public ViewHolder(View itemView) {
110 | super(itemView);
111 |
112 | mText = (TextView)itemView.findViewById(R.id.textView);
113 |
114 | mDeleteButton = (ImageButton)itemView.findViewById(R.id.imageButton);
115 | mDeleteButton.setVisibility(View.VISIBLE);
116 | mDeleteButton.setOnClickListener(mListener);
117 | }
118 |
119 | private final View.OnClickListener mListener = new View.OnClickListener() {
120 | @Override
121 | public void onClick(View view) {
122 | mData.remove(getAdapterPosition());
123 | notifyItemRemoved(getAdapterPosition());
124 | }
125 | };
126 | }
127 | }
128 | }
129 |
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/app/src/main/res/drawable-v24/ic_launcher_foreground.xml:
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/app/src/main/res/drawable/ic_close.xml:
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/app/src/main/res/drawable/shape_chips_close_btn.xml:
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/app/src/main/res/layout/activity_main.xml:
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/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml:
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5 |
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/app/src/main/res/values/colors.xml:
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1 |
2 |
3 | #3F51B5
4 | #303F9F
5 | #FF4081
6 |
7 | #E0E0E0
8 |
9 |
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/app/src/main/res/values/dimens.xml:
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1 |
2 |
3 | 10dp
4 | 10dp
5 |
6 |
7 |
8 |
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/app/src/main/res/values/strings.xml:
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1 |
2 | FlowLayoutManager
3 |
4 | - Afghanistan
5 | - Albania
6 | - Algeria
7 | - Andorra
8 | - Angola
9 | - Antigua and Barbuda
10 | - Argentina
11 | - Armenia
12 | - Australia
13 | - Austria
14 | - Azerbaijan
15 | - Bahamas
16 | - Bahrain
17 | - Bangladesh
18 | - Barbados
19 | - Belarus
20 | - Belgium
21 | - Belize
22 | - Benin
23 | - Bhutan
24 | - Bolivia
25 | - Bosnia and Herzegovina
26 | - Botswana
27 | - Brazil
28 | - Brunei
29 | - Bulgaria
30 | - Burkina Faso
31 | - Burundi
32 | - Cabo Verde
33 | - Cambodia
34 | - Cameroon
35 | - Canada
36 | - Central African Republic
37 | - Chad
38 | - Chile
39 | - China
40 | - Colombia
41 | - Comoros
42 | - Congo
43 | - Costa Rica
44 | - Cote d\'Ivoire
45 | - Croatia
46 | - Cuba
47 | - Cyprus
48 | - Czech Republic
49 | - Denmark
50 | - Djibouti
51 | - Dominica
52 | - Dominican Republic
53 | - Ecuador
54 | - Egypt
55 | - El Salvador
56 | - Equatorial Guinea
57 | - Eritrea
58 | - Estonia
59 | - Ethiopia
60 | - Fiji
61 | - Finland
62 | - France
63 | - Gabon
64 | - Gambia
65 | - Georgia
66 | - Germany
67 | - Ghana
68 | - Greece
69 | - Grenada
70 | - Guatemala
71 | - Guinea
72 | - Guinea-Bissau
73 | - Guyana
74 | - Haiti
75 | - Honduras
76 | - Hungary
77 | - Iceland
78 | - India
79 | - Indonesia
80 | - Iran
81 | - Iraq
82 | - Ireland
83 | - Israel
84 | - Italy
85 | - Jamaica
86 | - Japan
87 | - Jordan
88 | - Kazakhstan
89 | - Kenya
90 | - Kiribati
91 | - Kosovo
92 | - Kuwait
93 | - Kyrgyzstan
94 | - Laos
95 | - Latvia
96 | - Lebanon
97 | - Lesotho
98 | - Liberia
99 | - Libya
100 | - Liechtenstein
101 | - Lithuania
102 | - Luxembourg
103 | - Macedonia
104 | - Madagascar
105 | - Malawi
106 | - Malaysia
107 | - Maldives
108 | - Mali
109 | - Malta
110 | - Marshall Islands
111 | - Mauritania
112 | - Mauritius
113 | - Mexico
114 | - Micronesia
115 | - Moldova
116 | - Monaco
117 | - Mongolia
118 | - Montenegro
119 | - Morocco
120 | - Mozambique
121 | - Myanmar
122 | - Namibia
123 | - Nauru
124 | - Nepal
125 | - Netherlands
126 | - New Zealand
127 | - Nicaragua
128 | - Niger
129 | - Nigeria
130 | - North Korea
131 | - Norway
132 | - Oman
133 | - Pakistan
134 | - Palau
135 | - Palestine
136 | - Panama
137 | - Papua New Guinea
138 | - Paraguay
139 | - Peru
140 | - Philippines
141 | - Poland
142 | - Portugal
143 | - Qatar
144 | - Romania
145 | - Russia
146 | - Rwanda
147 | - Saint Kitts and Nevis
148 | - Saint Lucia
149 | - Saint Vincent and the Grenadines
150 | - Samoa
151 | - San Marino
152 | - Sao Tome and Principe
153 | - Saudi Arabia
154 | - Senegal
155 | - Serbia
156 | - Seychelles
157 | - Sierra Leone
158 | - Singapore
159 | - Slovakia
160 | - Slovenia
161 | - Solomon Islands
162 | - Somalia
163 | - South Africa
164 | - South Korea
165 | - South Sudan
166 | - Spain
167 | - Sri Lanka
168 | - Sudan
169 | - Suriname
170 | - Swaziland
171 | - Sweden
172 | - Switzerland
173 | - Syria
174 | - Taiwan
175 | - Tajikistan
176 | - Tanzania
177 | - Thailand
178 | - Timor-Leste
179 | - Togo
180 | - Tonga
181 | - Trinidad and Tobago
182 | - Tunisia
183 | - Turkey
184 | - Turkmenistan
185 | - Tuvalu
186 | - Uganda
187 | - Ukraine
188 | - United Arab Emirates
189 | - United Kingdom
190 | - United States of America
191 | - Uruguay
192 | - Uzbekistan
193 | - Vanuatu
194 | - Vatican City
195 | - Venezuela
196 | - Vietnam
197 | - Yemen
198 | - Zambia
199 | - Zimbabwe
200 |
201 |
202 |
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/app/src/main/res/values/styles.xml:
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1 |
2 |
3 |
4 |
10 |
11 |
12 |
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/app/src/test/java/ru/astrocode/sample/ExampleUnitTest.java:
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1 | package ru.astrocode.sample;
2 |
3 | import org.junit.Test;
4 |
5 | import static org.junit.Assert.assertEquals;
6 |
7 | /**
8 | * Example local unit test, which will execute on the development machine (host).
9 | *
10 | * @see Testing documentation
11 | */
12 | public class ExampleUnitTest {
13 | @Test
14 | public void addition_isCorrect() {
15 | assertEquals(4, 2 + 2);
16 | }
17 | }
--------------------------------------------------------------------------------
/build.gradle:
--------------------------------------------------------------------------------
1 | // Top-level build file where you can add configuration options common to all sub-projects/modules.
2 |
3 | buildscript {
4 |
5 | repositories {
6 | google()
7 | jcenter()
8 | }
9 | dependencies {
10 | classpath 'com.android.tools.build:gradle:3.1.4'
11 |
12 |
13 | // NOTE: Do not place your application dependencies here; they belong
14 | // in the individual module build.gradle files
15 | }
16 | }
17 |
18 | allprojects {
19 | repositories {
20 | google()
21 | jcenter()
22 | }
23 | }
24 |
25 | task clean(type: Delete) {
26 | delete rootProject.buildDir
27 | }
28 |
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/flow-layout-manager/.gitignore:
--------------------------------------------------------------------------------
1 | /build
2 |
--------------------------------------------------------------------------------
/flow-layout-manager/build.gradle:
--------------------------------------------------------------------------------
1 | apply plugin: 'com.android.library'
2 |
3 | android {
4 | compileSdkVersion 25
5 | defaultConfig {
6 | minSdkVersion 10
7 | targetSdkVersion 25
8 | versionCode 1
9 | versionName "1.0"
10 |
11 | testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
12 |
13 | }
14 | buildTypes {
15 | release {
16 | minifyEnabled false
17 | proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
18 | }
19 | }
20 | productFlavors {
21 | }
22 | }
23 |
24 | dependencies {
25 | implementation fileTree(include: ['*.jar'], dir: 'libs')
26 | testImplementation 'junit:junit:4.12'
27 | androidTestImplementation 'com.android.support.test:runner:1.0.2'
28 | androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
29 | implementation 'com.android.support:recyclerview-v7:25.4.0'
30 | }
31 |
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/flow-layout-manager/proguard-rules.pro:
--------------------------------------------------------------------------------
1 | # Add project specific ProGuard rules here.
2 | # You can control the set of applied configuration files using the
3 | # proguardFiles setting in build.gradle.
4 | #
5 | # For more details, see
6 | # http://developer.android.com/guide/developing/tools/proguard.html
7 |
8 | # If your project uses WebView with JS, uncomment the following
9 | # and specify the fully qualified class name to the JavaScript interface
10 | # class:
11 | #-keepclassmembers class fqcn.of.javascript.interface.for.webview {
12 | # public *;
13 | #}
14 |
15 | # Uncomment this to preserve the line number information for
16 | # debugging stack traces.
17 | #-keepattributes SourceFile,LineNumberTable
18 |
19 | # If you keep the line number information, uncomment this to
20 | # hide the original source file name.
21 | #-renamesourcefileattribute SourceFile
22 |
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/flow-layout-manager/src/androidTest/java/ru/astrocode/flm/ExampleInstrumentedTest.java:
--------------------------------------------------------------------------------
1 | package ru.astrocode.flm;
2 |
3 | import android.content.Context;
4 | import android.support.test.InstrumentationRegistry;
5 | import android.support.test.runner.AndroidJUnit4;
6 |
7 | import org.junit.Test;
8 | import org.junit.runner.RunWith;
9 |
10 | import static org.junit.Assert.assertEquals;
11 |
12 | /**
13 | * Instrumented test, which will execute on an Android device.
14 | *
15 | * @see Testing documentation
16 | */
17 | @RunWith(AndroidJUnit4.class)
18 | public class ExampleInstrumentedTest {
19 | @Test
20 | public void useAppContext() {
21 | // Context of the app under test.
22 | Context appContext = InstrumentationRegistry.getTargetContext();
23 |
24 | assertEquals("ru.astrocode.flm.test", appContext.getPackageName());
25 | }
26 | }
27 |
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/flow-layout-manager/src/main/AndroidManifest.xml:
--------------------------------------------------------------------------------
1 |
2 |
--------------------------------------------------------------------------------
/flow-layout-manager/src/main/java/ru/astrocode/flm/FLMFlowLayoutManager.java:
--------------------------------------------------------------------------------
1 | package ru.astrocode.flm;
2 |
3 | import android.graphics.PointF;
4 | import android.os.Bundle;
5 | import android.os.Parcelable;
6 | import android.support.annotation.NonNull;
7 | import android.support.v4.view.GravityCompat;
8 | import android.support.v7.widget.LinearSmoothScroller;
9 | import android.support.v7.widget.OrientationHelper;
10 | import android.support.v7.widget.RecyclerView;
11 | import android.util.Log;
12 | import android.view.Gravity;
13 | import android.view.View;
14 | import android.view.ViewGroup;
15 |
16 | import java.util.ArrayList;
17 |
18 | /**
19 | * Created by Astrocode on 26.05.18.
20 | */
21 | public class FLMFlowLayoutManager extends RecyclerView.LayoutManager implements RecyclerView.SmoothScroller.ScrollVectorProvider {
22 |
23 | public final static int VERTICAL = OrientationHelper.VERTICAL, HORIZONTAL = OrientationHelper.HORIZONTAL;
24 | public final static int DEFAULT_COUNT_ITEM_IN_LINE = -1;
25 |
26 | private final static String TAG_FIRST_ITEM_ADAPTER_INDEX = "TAG_FIRST_ITEM_ADAPTER_INDEX";
27 | private final static String TAG_FIRST_LINE_START_POSITION = "TAG_FIRST_LINE_START_POSITION";
28 |
29 | private final static String ERROR_UNKNOWN_ORIENTATION = "Unknown orientation!";
30 | private final static String ERROR_BAD_ARGUMENT = "Inappropriate field value!";
31 |
32 | private int mGravity;
33 | private int mOrientation;
34 |
35 | private int mMaxItemsInLine;
36 |
37 | private int mSpacingBetweenItems;
38 | private int mSpacingBetweenLines;
39 |
40 | private FLMLayoutManagerHelper mLayoutManagerHelper;
41 |
42 | private ArrayList mCurrentLines;
43 |
44 | private int mFirstItemAdapterIndex;
45 | private int mFirstLineStartPosition;
46 |
47 | public FLMFlowLayoutManager(int orientation) {
48 | this(orientation, Gravity.START, DEFAULT_COUNT_ITEM_IN_LINE, 0, 0);
49 | }
50 |
51 | public FLMFlowLayoutManager(int orientation, int gravity) {
52 | this(orientation, gravity, DEFAULT_COUNT_ITEM_IN_LINE, 0, 0);
53 | }
54 |
55 | public FLMFlowLayoutManager(int orientation, int gravity, int spacingBetweenItems, int spacingBetweenLines) {
56 | this(orientation, gravity, DEFAULT_COUNT_ITEM_IN_LINE, spacingBetweenItems, spacingBetweenLines);
57 | }
58 |
59 | public FLMFlowLayoutManager(int orientation, int gravity, int maxItemsInLine, int spacingBetweenItems, int spacingBetweenLines) {
60 | mCurrentLines = new ArrayList<>();
61 |
62 | mGravity = gravity;
63 |
64 | mFirstItemAdapterIndex = 0;
65 | mFirstLineStartPosition = -1;
66 |
67 | if (maxItemsInLine == 0 || maxItemsInLine < -1) {
68 | throw new IllegalArgumentException(ERROR_BAD_ARGUMENT);
69 | }
70 |
71 | mMaxItemsInLine = maxItemsInLine;
72 |
73 | if (mSpacingBetweenItems < 0) {
74 | throw new IllegalArgumentException(ERROR_BAD_ARGUMENT);
75 | }
76 |
77 | mSpacingBetweenItems = spacingBetweenItems;
78 |
79 | if (mSpacingBetweenLines < 0) {
80 | throw new IllegalArgumentException(ERROR_BAD_ARGUMENT);
81 | }
82 |
83 | mSpacingBetweenLines = spacingBetweenLines;
84 |
85 | if (orientation != HORIZONTAL && orientation != VERTICAL) {
86 | throw new IllegalArgumentException(ERROR_UNKNOWN_ORIENTATION);
87 | }
88 | mOrientation = orientation;
89 |
90 | mLayoutManagerHelper = FLMLayoutManagerHelper.createLayoutManagerHelper(this, orientation, mGravity);
91 | }
92 |
93 | @Override
94 | public RecyclerView.LayoutParams generateDefaultLayoutParams() {
95 | return new RecyclerView.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
96 | ViewGroup.LayoutParams.WRAP_CONTENT);
97 | }
98 |
99 | @Override
100 | public void onLayoutChildren(RecyclerView.Recycler recycler, RecyclerView.State state) {
101 | Line currentLine = null;
102 |
103 | if (mFirstLineStartPosition == -1) {
104 | mFirstLineStartPosition = mLayoutManagerHelper.getStartAfterPadding();
105 | }
106 |
107 | int topOrLeft = mFirstLineStartPosition;
108 |
109 | detachAndScrapAttachedViews(recycler);
110 | mCurrentLines.clear();
111 |
112 | for (int i = mFirstItemAdapterIndex; i < getItemCount(); i += currentLine.mItemsCount) {
113 | currentLine = addLineToEnd(i, topOrLeft, recycler);
114 |
115 | mCurrentLines.add(currentLine);
116 |
117 | topOrLeft = mSpacingBetweenLines + currentLine.mEndValueOfTheHighestItem;
118 |
119 | if (currentLine.mEndValueOfTheHighestItem > mLayoutManagerHelper.getEndAfterPadding()) {
120 | break;
121 | }
122 | }
123 |
124 | if (mFirstItemAdapterIndex > 0 && currentLine != null) {
125 | int availableOffset = currentLine.mEndValueOfTheHighestItem - mLayoutManagerHelper.getEnd() + mLayoutManagerHelper.getEndPadding();
126 |
127 | if (availableOffset < 0) {
128 | if (mOrientation == VERTICAL) {
129 | scrollVerticallyBy(availableOffset, recycler, state);
130 | } else {
131 | scrollHorizontallyBy(availableOffset, recycler, state);
132 | }
133 | }
134 | }
135 |
136 | }
137 |
138 | @Override
139 | public void onRestoreInstanceState(Parcelable state) {
140 | Bundle data = (Bundle) state;
141 |
142 | mFirstItemAdapterIndex = data.getInt(TAG_FIRST_ITEM_ADAPTER_INDEX);
143 | mFirstLineStartPosition = data.getInt(TAG_FIRST_LINE_START_POSITION);
144 | }
145 |
146 | @Override
147 | public Parcelable onSaveInstanceState() {
148 | Bundle data = new Bundle();
149 |
150 | data.putInt(TAG_FIRST_ITEM_ADAPTER_INDEX, mFirstItemAdapterIndex);
151 | data.putInt(TAG_FIRST_LINE_START_POSITION, mFirstLineStartPosition);
152 |
153 | return data;
154 | }
155 |
156 | /**
157 | * Change orientation of the layout manager
158 | *
159 | * @param orientation New orientation.
160 | */
161 |
162 | public void setOrientation(int orientation) {
163 |
164 | if (orientation != HORIZONTAL && orientation != VERTICAL) {
165 | throw new IllegalArgumentException(ERROR_UNKNOWN_ORIENTATION);
166 | }
167 |
168 | if (orientation != mOrientation) {
169 | assertNotInLayoutOrScroll(null);
170 |
171 | mOrientation = orientation;
172 | mLayoutManagerHelper = FLMLayoutManagerHelper.createLayoutManagerHelper(this, orientation, mGravity);
173 |
174 | requestLayout();
175 | }
176 | }
177 |
178 | public void setMaxItemsInLine(int maxItemsInLine) {
179 |
180 | if (maxItemsInLine <= 0) {
181 | throw new IllegalArgumentException(ERROR_BAD_ARGUMENT);
182 | }
183 |
184 | assertNotInLayoutOrScroll(null);
185 |
186 | mMaxItemsInLine = maxItemsInLine;
187 |
188 | requestLayout();
189 | }
190 |
191 | public void setSpacingBetweenItems(int spacingBetweenItems) {
192 |
193 | if (spacingBetweenItems < 0) {
194 | throw new IllegalArgumentException(ERROR_BAD_ARGUMENT);
195 | }
196 |
197 | assertNotInLayoutOrScroll(null);
198 |
199 | mSpacingBetweenItems = spacingBetweenItems;
200 |
201 | requestLayout();
202 | }
203 |
204 | public void setSpacingBetweenLines(int spacingBetweenLines) {
205 |
206 | if (spacingBetweenLines < 0) {
207 | throw new IllegalArgumentException(ERROR_BAD_ARGUMENT);
208 | }
209 |
210 | assertNotInLayoutOrScroll(null);
211 |
212 | mSpacingBetweenLines = spacingBetweenLines;
213 |
214 | requestLayout();
215 | }
216 |
217 | /**
218 | * Return current orientation of the layout manager.
219 | */
220 | public int getOrientation() {
221 | return mOrientation;
222 | }
223 |
224 | /**
225 | * Change gravity of the layout manager.
226 | *
227 | * @param gravity New gravity.
228 | */
229 | public void setGravity(int gravity) {
230 | assertNotInLayoutOrScroll(null);
231 |
232 | if (gravity != mGravity) {
233 | mGravity = gravity;
234 | mLayoutManagerHelper.setGravity(gravity);
235 |
236 | requestLayout();
237 | }
238 | }
239 |
240 | /**
241 | * Return current gravity of the layout manager.
242 | */
243 | public int getGravity() {
244 | return mGravity;
245 | }
246 |
247 | /**
248 | * Add one line to the end of recyclerView.
249 | *
250 | * @param startAdapterIndex Adapter index of first item of new line.
251 | * @param start Start position(Top - if orientation is VERTICAL or Left - if orientation is HORIZONTAL) of the new line.
252 | * @return New line.
253 | */
254 | @NonNull
255 | private Line addLineToEnd(int startAdapterIndex, int start, RecyclerView.Recycler recycler) {
256 | boolean isEndOfLine = false;
257 |
258 | int currentAdapterIndex = startAdapterIndex;
259 | int currentItemsSize = 0;
260 | int currentMaxValue = 0;
261 |
262 | Line line = new Line();
263 | line.mStartValueOfTheHighestItem = start;
264 |
265 | while (!isEndOfLine && currentAdapterIndex < getItemCount()) {
266 | final View view = recycler.getViewForPosition(currentAdapterIndex);
267 |
268 | addView(view);
269 |
270 | measureChildWithMargins(view, 0, 0);
271 |
272 | final int widthOrHeight = mLayoutManagerHelper.getDecoratedMeasurementInOther(view);
273 | final int heightOrWidth = mLayoutManagerHelper.getDecoratedMeasurement(view);
274 |
275 | if (line.mItemsCount == mMaxItemsInLine || (currentItemsSize + widthOrHeight) >= mLayoutManagerHelper.getLineSize()) {
276 | isEndOfLine = true;
277 |
278 | if (currentItemsSize == 0) {
279 | currentMaxValue = heightOrWidth;
280 |
281 | line.mEndValueOfTheHighestItem = line.mStartValueOfTheHighestItem + currentMaxValue;
282 | line.mItemsCount++;
283 | } else {
284 | detachAndScrapView(view, recycler);
285 | continue;
286 | }
287 | } else {
288 | if (heightOrWidth > currentMaxValue) {
289 | currentMaxValue = heightOrWidth;
290 | line.mEndValueOfTheHighestItem = line.mStartValueOfTheHighestItem + currentMaxValue;
291 | }
292 | line.mItemsCount++;
293 | }
294 |
295 | currentItemsSize += widthOrHeight + mSpacingBetweenItems;
296 |
297 | currentAdapterIndex++;
298 | }
299 |
300 | layoutItemsToEnd(currentItemsSize - mSpacingBetweenItems, currentMaxValue, line.mItemsCount, line.mStartValueOfTheHighestItem);
301 |
302 | return line;
303 | }
304 |
305 | /**
306 | * Arrange of views from start to end.
307 | *
308 | * @param itemsSize Size(width - if orientation is VERTICAL or height - if orientation is HORIZONTAL) of all items(include spacing) in line.
309 | * @param maxItemHeightOrWidth Max item height(if VERTICAL) or width(if HORIZONTAL) in line.
310 | * @param itemsInLine Item count in line.
311 | * @param startValueOfTheHighestItem Start position(Top - if orientation is VERTICAL or Left - if orientation is HORIZONTAL) of the line.
312 | */
313 | private void layoutItemsToEnd(int itemsSize, int maxItemHeightOrWidth, int itemsInLine, int startValueOfTheHighestItem) {
314 | int currentStart = mLayoutManagerHelper.getStartPositionOfFirstItem(itemsSize);
315 |
316 | int i = itemsInLine;
317 | int childCount = getChildCount();
318 | int currentStartValue;
319 |
320 | while (i > 0) {
321 | final View view = getChildAt(childCount - i);
322 |
323 | final int widthOrHeight = mLayoutManagerHelper.getDecoratedMeasurementInOther(view);
324 | final int heightOrWidth = mLayoutManagerHelper.getDecoratedMeasurement(view);
325 |
326 | currentStartValue = startValueOfTheHighestItem + mLayoutManagerHelper.getPositionOfCurrentItem(maxItemHeightOrWidth, heightOrWidth);
327 |
328 | if (mOrientation == VERTICAL) {
329 | layoutDecoratedWithMargins(view, currentStart, currentStartValue,
330 | currentStart + widthOrHeight, currentStartValue + heightOrWidth);
331 | } else {
332 | layoutDecoratedWithMargins(view, currentStartValue, currentStart,
333 | currentStartValue + heightOrWidth, currentStart + widthOrHeight);
334 | }
335 |
336 | currentStart += widthOrHeight + mSpacingBetweenItems;
337 |
338 | i--;
339 | }
340 | }
341 |
342 | /**
343 | * Add one line to the start of recyclerView.
344 | *
345 | * @param startAdapterIndex Adapter index of first item of new line.
346 | * @param end End position(Bottom - if orientation is VERTICAL or Right - if orientation is HORIZONTAL) of the new line.
347 | * @return New line.
348 | */
349 | @NonNull
350 | private Line addLineToStart(int startAdapterIndex, int end, RecyclerView.Recycler recycler) {
351 | boolean isEndOfLine = false;
352 |
353 | int currentAdapterIndex = startAdapterIndex;
354 | int currentItemsSize = 0;
355 | int currentMaxValue = 0;
356 |
357 | Line line = new Line();
358 | line.mEndValueOfTheHighestItem = end;
359 |
360 | while (!isEndOfLine && currentAdapterIndex >= 0) {
361 | final View view = recycler.getViewForPosition(currentAdapterIndex);
362 |
363 | addView(view, 0);
364 |
365 | measureChildWithMargins(view, 0, 0);
366 |
367 | final int widthOrHeight = mLayoutManagerHelper.getDecoratedMeasurementInOther(view);
368 | final int heightOrWidth = mLayoutManagerHelper.getDecoratedMeasurement(view);
369 |
370 | if (line.mItemsCount == mMaxItemsInLine || (currentItemsSize + widthOrHeight) >= mLayoutManagerHelper.getLineSize()) {
371 | isEndOfLine = true;
372 |
373 | if (currentItemsSize == 0) {
374 | currentMaxValue = heightOrWidth;
375 |
376 | line.mStartValueOfTheHighestItem = line.mEndValueOfTheHighestItem - currentMaxValue;
377 | line.mItemsCount++;
378 | } else {
379 | detachAndScrapView(view, recycler);
380 | continue;
381 | }
382 | } else {
383 | if (heightOrWidth > currentMaxValue) {
384 | currentMaxValue = heightOrWidth;
385 | line.mStartValueOfTheHighestItem = line.mEndValueOfTheHighestItem - currentMaxValue;
386 | }
387 | line.mItemsCount++;
388 | }
389 |
390 | currentItemsSize += widthOrHeight + mSpacingBetweenItems;
391 |
392 | currentAdapterIndex--;
393 | }
394 |
395 | layoutItemsToStart(currentItemsSize - mSpacingBetweenItems, currentMaxValue, line.mItemsCount, line.mStartValueOfTheHighestItem);
396 |
397 | return line;
398 | }
399 |
400 | /**
401 | * Arrange of views from end to start.
402 | *
403 | * @param itemsSize Size(width - if orientation is VERTICAL or height - if orientation is HORIZONTAL) of all items(include spacing) in line.
404 | * @param maxItemHeightOrWidth Max item height(if VERTICAL) or width(if HORIZONTAL) in line.
405 | * @param itemsInLine Item count in line.
406 | * @param startValueOfTheHighestItem Start position(Top - if orientation is VERTICAL or Left - if orientation is HORIZONTAL) of the line.
407 | */
408 | private void layoutItemsToStart(int itemsSize, int maxItemHeightOrWidth, int itemsInLine, int startValueOfTheHighestItem) {
409 | int currentStart = mLayoutManagerHelper.getStartPositionOfFirstItem(itemsSize);
410 |
411 | int i = 0;
412 | int currentStartValue;
413 |
414 | while (i < itemsInLine) {
415 | final View view = getChildAt(i);
416 |
417 | final int widthOrHeight = mLayoutManagerHelper.getDecoratedMeasurementInOther(view);
418 | final int heightOrWidth = mLayoutManagerHelper.getDecoratedMeasurement(view);
419 |
420 | currentStartValue = startValueOfTheHighestItem + mLayoutManagerHelper.getPositionOfCurrentItem(maxItemHeightOrWidth, heightOrWidth);
421 |
422 | if (mOrientation == VERTICAL) {
423 | layoutDecoratedWithMargins(view, currentStart, currentStartValue,
424 | currentStart + widthOrHeight, currentStartValue + heightOrWidth);
425 |
426 | } else {
427 | layoutDecoratedWithMargins(view, currentStartValue, currentStart,
428 | currentStartValue + heightOrWidth, currentStart + widthOrHeight);
429 | }
430 |
431 | currentStart += widthOrHeight + mSpacingBetweenItems;
432 |
433 | i++;
434 | }
435 | }
436 |
437 | /**
438 | * Adds to start (and delete from end) of the recyclerView the required number of lines depending on the offset.
439 | *
440 | * @param offset Original offset.
441 | * @param recycler
442 | * @return Real offset.
443 | */
444 | private int addLinesToStartAndDeleteFromEnd(int offset, RecyclerView.Recycler recycler) {
445 | Line line = mCurrentLines.get(0);
446 |
447 | final int availableOffset = line.mStartValueOfTheHighestItem - mLayoutManagerHelper.getStartAfterPadding();
448 |
449 | int currentOffset = availableOffset < offset ? offset : availableOffset;
450 | int adapterViewIndex = getPosition(getChildAt(0)) - 1;
451 |
452 | int startValueOfNewLine = line.mStartValueOfTheHighestItem - mSpacingBetweenLines;
453 |
454 | while (adapterViewIndex >= 0) {
455 |
456 | if (currentOffset <= offset) {
457 | deleteLinesFromEnd(offset, recycler);
458 | break;
459 | } else {
460 | deleteLinesFromEnd(currentOffset, recycler);
461 | }
462 |
463 | line = addLineToStart(adapterViewIndex, startValueOfNewLine, recycler);
464 | mCurrentLines.add(0, line);
465 |
466 | startValueOfNewLine = line.mStartValueOfTheHighestItem - mSpacingBetweenLines;
467 |
468 | currentOffset = line.mStartValueOfTheHighestItem;
469 | adapterViewIndex -= line.mItemsCount;
470 | }
471 |
472 | return currentOffset < offset ? offset : currentOffset;
473 | }
474 |
475 | /**
476 | * Removes lines from the end. The number of deleted lines depends on the offset.
477 | *
478 | * @param offset Current offset.
479 | * @param recycler
480 | */
481 | private void deleteLinesFromEnd(int offset, RecyclerView.Recycler recycler) {
482 | Line lineToDel = mCurrentLines.get(mCurrentLines.size() - 1);
483 |
484 | while (lineToDel != null) {
485 | if (lineToDel.mStartValueOfTheHighestItem - offset >
486 | mLayoutManagerHelper.getEndAfterPadding()) {
487 | for (int i = 0; i < lineToDel.mItemsCount; i++) {
488 | removeAndRecycleView(getChildAt(getChildCount() - 1), recycler);
489 | }
490 | mCurrentLines.remove(lineToDel);
491 | lineToDel = mCurrentLines.get(mCurrentLines.size() - 1);
492 | } else {
493 | lineToDel = null;
494 | }
495 | }
496 | }
497 |
498 | /**
499 | * Adds to end (and delete from start) of the recyclerView the required number of lines depending on the offset.
500 | *
501 | * @param offset Original offset.
502 | * @param recycler
503 | * @return Real offset.
504 | */
505 | private int addLinesToEndAndDeleteFromStart(int offset, RecyclerView.Recycler recycler) {
506 | Line line = mCurrentLines.get(mCurrentLines.size() - 1);
507 |
508 | int availableOffset = line.mEndValueOfTheHighestItem - mLayoutManagerHelper.getEnd() + mLayoutManagerHelper.getEndPadding();
509 |
510 | int currentOffset = availableOffset > offset ? offset : availableOffset;
511 | int adapterViewIndex = getPosition(getChildAt(getChildCount() - 1)) + 1;
512 |
513 | int startValueOfNewLine = line.mEndValueOfTheHighestItem + mSpacingBetweenLines;
514 |
515 | while (adapterViewIndex < getItemCount()) {
516 |
517 | if (currentOffset >= offset) {
518 | deleteLinesFromStart(offset, recycler);
519 | break;
520 | } else {
521 | deleteLinesFromStart(currentOffset, recycler);
522 | }
523 |
524 | line = addLineToEnd(adapterViewIndex, startValueOfNewLine, recycler);
525 | mCurrentLines.add(line);
526 |
527 | startValueOfNewLine = line.mEndValueOfTheHighestItem + mSpacingBetweenLines;
528 |
529 | currentOffset = line.mEndValueOfTheHighestItem - mLayoutManagerHelper.getEnd();
530 | adapterViewIndex += line.mItemsCount;
531 | }
532 |
533 |
534 | return currentOffset > offset ? offset : currentOffset;
535 | }
536 |
537 | /**
538 | * Removes lines from the start. The number of deleted lines depends on the offset.
539 | *
540 | * @param offset Current offset.
541 | * @param recycler
542 | */
543 | private void deleteLinesFromStart(int offset, RecyclerView.Recycler recycler) {
544 | Line lineToDel = mCurrentLines.get(0);
545 |
546 | while (lineToDel != null) {
547 | if (lineToDel.mEndValueOfTheHighestItem - offset <
548 | mLayoutManagerHelper.getStartAfterPadding()) {
549 | for (int i = 0; i < lineToDel.mItemsCount; i++) {
550 | removeAndRecycleView(getChildAt(0), recycler);
551 | }
552 | mCurrentLines.remove(lineToDel);
553 | // mItemsInLines.add(lineToDel.mItemsCount);
554 |
555 | lineToDel = mCurrentLines.get(0);
556 | } else {
557 | lineToDel = null;
558 | }
559 | }
560 | }
561 |
562 | @Override
563 | public int scrollVerticallyBy(int dy, RecyclerView.Recycler recycler, RecyclerView.State state) {
564 | int offset = 0;
565 |
566 | if (getChildCount() > 0 && dy != 0) {
567 |
568 | if (dy > 0) {
569 | offset = addLinesToEndAndDeleteFromStart(dy, recycler);
570 | } else {
571 | offset = addLinesToStartAndDeleteFromEnd(dy, recycler);
572 | }
573 |
574 | if (offset != 0) {
575 | for (int i = 0; i < mCurrentLines.size(); i++) {
576 | mCurrentLines.get(i).offset(-offset);
577 | }
578 | offsetChildrenVertical(-offset);
579 | }
580 |
581 | final View firstView = getChildAt(0);
582 |
583 | mFirstLineStartPosition = mLayoutManagerHelper.getDecoratedStart(firstView);
584 | mFirstItemAdapterIndex = getPosition(firstView);
585 | }
586 |
587 | return offset;
588 | }
589 |
590 | @Override
591 | public int scrollHorizontallyBy(int dx, RecyclerView.Recycler recycler, RecyclerView.State state) {
592 | int offset = 0;
593 |
594 | if (getChildCount() > 0 && dx != 0) {
595 |
596 | if (dx > 0) {
597 | offset = addLinesToEndAndDeleteFromStart(dx, recycler);
598 | } else {
599 | offset = addLinesToStartAndDeleteFromEnd(dx, recycler);
600 | }
601 |
602 | if (offset != 0) {
603 | for (int i = 0; i < mCurrentLines.size(); i++) {
604 | mCurrentLines.get(i).offset(-offset);
605 | }
606 | offsetChildrenHorizontal(-offset);
607 | }
608 |
609 | final View firstView = getChildAt(0);
610 |
611 | mFirstLineStartPosition = mLayoutManagerHelper.getDecoratedStart(firstView);
612 | mFirstItemAdapterIndex = getPosition(firstView);
613 | }
614 |
615 | return offset;
616 | }
617 |
618 | @Override
619 | public boolean canScrollVertically() {
620 | return mOrientation == VERTICAL;
621 | }
622 |
623 | @Override
624 | public boolean canScrollHorizontally() {
625 | return mOrientation == HORIZONTAL;
626 | }
627 |
628 | @Override
629 | public void scrollToPosition(int position) {
630 | if (position >= 0 && position <= getItemCount() - 1) {
631 | mFirstItemAdapterIndex = position;
632 | mFirstLineStartPosition = -1;
633 | requestLayout();
634 | }
635 | }
636 |
637 | @Override
638 | public void smoothScrollToPosition(RecyclerView recyclerView, RecyclerView.State state, int position) {
639 | LinearSmoothScroller linearSmoothScroller = new LinearSmoothScroller(recyclerView.getContext());
640 | linearSmoothScroller.setTargetPosition(position);
641 |
642 | startSmoothScroll(linearSmoothScroller);
643 | }
644 |
645 | @Override
646 | public PointF computeScrollVectorForPosition(int targetPosition) {
647 | if (getChildCount() == 0) {
648 | return null;
649 | }
650 |
651 | final int firstChildPos = getPosition(getChildAt(0));
652 | final int direction = targetPosition < firstChildPos ? -1 : 1;
653 |
654 | if (mOrientation == HORIZONTAL) {
655 | return new PointF(direction, 0);
656 | } else {
657 | return new PointF(0, direction);
658 | }
659 | }
660 |
661 | /**
662 | * Representation of line in RecyclerView.
663 | */
664 | private final static class Line {
665 |
666 | int mStartValueOfTheHighestItem;
667 | int mEndValueOfTheHighestItem;
668 |
669 | int mItemsCount;
670 |
671 | void offset(int offset) {
672 | mStartValueOfTheHighestItem += offset;
673 | mEndValueOfTheHighestItem += offset;
674 | }
675 | }
676 |
677 | /**
678 | * Orientation and gravity helper.
679 | */
680 | private static abstract class FLMLayoutManagerHelper {
681 |
682 | RecyclerView.LayoutManager mLayoutManager;
683 | int mGravity;
684 |
685 | private FLMLayoutManagerHelper(RecyclerView.LayoutManager layoutManager, int gravity) {
686 | mLayoutManager = layoutManager;
687 | mGravity = gravity;
688 | }
689 |
690 | public void setGravity(int gravity) {
691 | mGravity = gravity;
692 | }
693 |
694 | public abstract int getEnd();
695 |
696 | public abstract int getEndPadding();
697 |
698 | public abstract int getLineSize();
699 |
700 | public abstract int getEndAfterPadding();
701 |
702 | public abstract int getStartAfterPadding();
703 |
704 | public abstract int getDecoratedStart(View view);
705 |
706 | public abstract int getDecoratedMeasurement(View view);
707 |
708 | public abstract int getDecoratedMeasurementInOther(View view);
709 |
710 | public abstract int getStartPositionOfFirstItem(int itemsSize);
711 |
712 | public abstract int getPositionOfCurrentItem(int itemMaxSize, int itemSize);
713 |
714 | public static FLMLayoutManagerHelper createLayoutManagerHelper(RecyclerView.LayoutManager layoutManager, int orientation, int gravity) {
715 | switch (orientation) {
716 | case VERTICAL:
717 | return createVerticalLayoutManagerHelper(layoutManager, gravity);
718 | case HORIZONTAL:
719 | return createHorizontalLayoutManagerHelper(layoutManager, gravity);
720 | default:
721 | throw new IllegalArgumentException(ERROR_UNKNOWN_ORIENTATION);
722 | }
723 | }
724 |
725 | private static FLMLayoutManagerHelper createVerticalLayoutManagerHelper(final RecyclerView.LayoutManager layoutManager, int gravity) {
726 | return new FLMLayoutManagerHelper(layoutManager, gravity) {
727 | @Override
728 | public int getEnd() {
729 | return mLayoutManager.getHeight();
730 | }
731 |
732 | @Override
733 | public int getEndPadding() {
734 | return mLayoutManager.getPaddingBottom();
735 | }
736 |
737 | @Override
738 | public int getLineSize() {
739 | return mLayoutManager.getWidth() - mLayoutManager.getPaddingLeft() - mLayoutManager.getPaddingRight();
740 | }
741 |
742 | @Override
743 | public int getEndAfterPadding() {
744 | return mLayoutManager.getHeight() - mLayoutManager.getPaddingBottom();
745 | }
746 |
747 | @Override
748 | public int getStartAfterPadding() {
749 | return mLayoutManager.getPaddingTop();
750 | }
751 |
752 | @Override
753 | public int getDecoratedStart(View view) {
754 | RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) view.getLayoutParams();
755 |
756 | return this.mLayoutManager.getDecoratedTop(view) - params.topMargin;
757 | }
758 |
759 | @Override
760 | public int getDecoratedMeasurement(View view) {
761 | final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) view.getLayoutParams();
762 |
763 | return mLayoutManager.getDecoratedMeasuredHeight(view) + params.topMargin + params.bottomMargin;
764 | }
765 |
766 | @Override
767 | public int getDecoratedMeasurementInOther(View view) {
768 | final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) view.getLayoutParams();
769 |
770 | return mLayoutManager.getDecoratedMeasuredWidth(view) + params.leftMargin + params.rightMargin;
771 | }
772 |
773 | @Override
774 | public int getStartPositionOfFirstItem(int itemsSize) {
775 | int horizontalGravity = GravityCompat.getAbsoluteGravity(mGravity, mLayoutManager.getLayoutDirection());
776 | int startPosition;
777 |
778 | switch (horizontalGravity & Gravity.HORIZONTAL_GRAVITY_MASK) {
779 | case Gravity.RIGHT:
780 | startPosition = mLayoutManager.getWidth() - mLayoutManager.getPaddingRight() - itemsSize;
781 | break;
782 | case Gravity.CENTER_HORIZONTAL:
783 | startPosition = (mLayoutManager.getWidth() - mLayoutManager.getPaddingLeft() - mLayoutManager.getPaddingRight()) / 2
784 | - itemsSize / 2;
785 | break;
786 | default:
787 | startPosition = mLayoutManager.getPaddingLeft();
788 | break;
789 | }
790 |
791 | return startPosition;
792 | }
793 |
794 | @Override
795 | public int getPositionOfCurrentItem(int itemMaxSize, int itemSize) {
796 | int verticalGravity = mGravity & Gravity.VERTICAL_GRAVITY_MASK;
797 | int currentPosition;
798 |
799 | switch (verticalGravity) {
800 | case Gravity.CENTER_VERTICAL:
801 | currentPosition = itemMaxSize / 2 - itemSize / 2;
802 | break;
803 | case Gravity.BOTTOM:
804 | currentPosition = itemMaxSize - itemSize;
805 | break;
806 | default:
807 | currentPosition = 0;
808 | break;
809 | }
810 | return currentPosition;
811 | }
812 |
813 | };
814 | }
815 |
816 | private static FLMLayoutManagerHelper createHorizontalLayoutManagerHelper(RecyclerView.LayoutManager layoutManager, int gravity) {
817 | return new FLMLayoutManagerHelper(layoutManager, gravity) {
818 |
819 | @Override
820 | public int getEnd() {
821 | return mLayoutManager.getWidth();
822 | }
823 |
824 | @Override
825 | public int getEndPadding() {
826 | return mLayoutManager.getPaddingRight();
827 | }
828 |
829 | @Override
830 | public int getLineSize() {
831 | return mLayoutManager.getHeight() - mLayoutManager.getPaddingTop() - mLayoutManager.getPaddingBottom();
832 | }
833 |
834 | @Override
835 | public int getEndAfterPadding() {
836 | return mLayoutManager.getWidth() - mLayoutManager.getPaddingRight();
837 | }
838 |
839 | @Override
840 | public int getStartAfterPadding() {
841 | return mLayoutManager.getPaddingLeft();
842 | }
843 |
844 | @Override
845 | public int getDecoratedStart(View view) {
846 | RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) view.getLayoutParams();
847 |
848 | return this.mLayoutManager.getDecoratedLeft(view) - params.leftMargin;
849 | }
850 |
851 | @Override
852 | public int getDecoratedMeasurement(View view) {
853 | return mLayoutManager.getDecoratedMeasuredWidth(view);
854 | }
855 |
856 | @Override
857 | public int getDecoratedMeasurementInOther(View view) {
858 | return mLayoutManager.getDecoratedMeasuredHeight(view);
859 | }
860 |
861 | @Override
862 | public int getStartPositionOfFirstItem(int itemsSize) {
863 | int verticalGravity = mGravity & Gravity.VERTICAL_GRAVITY_MASK;
864 | int startPosition;
865 |
866 | switch (verticalGravity) {
867 | case Gravity.CENTER_VERTICAL:
868 | startPosition = (mLayoutManager.getHeight() - mLayoutManager.getPaddingTop() - mLayoutManager.getPaddingBottom()) / 2
869 | - itemsSize / 2;
870 | break;
871 | case Gravity.BOTTOM:
872 | startPosition = mLayoutManager.getHeight() - mLayoutManager.getPaddingBottom() - itemsSize;
873 | break;
874 | default:
875 | startPosition = mLayoutManager.getPaddingTop();
876 | break;
877 | }
878 |
879 | return startPosition;
880 | }
881 |
882 | @Override
883 | public int getPositionOfCurrentItem(int itemMaxSize, int itemSize) {
884 | int horizontalGravity = GravityCompat.getAbsoluteGravity(mGravity, mLayoutManager.getLayoutDirection());
885 | int currentPosition;
886 |
887 | switch (horizontalGravity & Gravity.HORIZONTAL_GRAVITY_MASK) {
888 | case Gravity.CENTER_HORIZONTAL:
889 | currentPosition = itemMaxSize / 2 - itemSize / 2;
890 | break;
891 | case Gravity.RIGHT:
892 | currentPosition = itemMaxSize - itemSize;
893 | break;
894 | default:
895 | currentPosition = 0;
896 | break;
897 | }
898 | return currentPosition;
899 | }
900 | };
901 | }
902 | }
903 | }
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/flow-layout-manager/src/main/res/values/strings.xml:
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1 |
2 | FlowLayoutManager
3 |
4 |
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/flow-layout-manager/src/test/java/ru/astrocode/flm/ExampleUnitTest.java:
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1 | package ru.astrocode.flm;
2 |
3 | import org.junit.Test;
4 |
5 | import static org.junit.Assert.assertEquals;
6 |
7 | /**
8 | * Example local unit test, which will execute on the development machine (host).
9 | *
10 | * @see Testing documentation
11 | */
12 | public class ExampleUnitTest {
13 | @Test
14 | public void addition_isCorrect() {
15 | assertEquals(4, 2 + 2);
16 | }
17 | }
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/flow_layout_manager_vertical.gif:
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https://raw.githubusercontent.com/Astrocode011235813/FlowLayoutManager/d1cef697e9458c6651e7f40d438d270b2bc6d709/flow_layout_manager_vertical.gif
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/gradle.properties:
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1 | # Project-wide Gradle settings.
2 | # IDE (e.g. Android Studio) users:
3 | # Gradle settings configured through the IDE *will override*
4 | # any settings specified in this file.
5 | # For more details on how to configure your build environment visit
6 | # http://www.gradle.org/docs/current/userguide/build_environment.html
7 | # Specifies the JVM arguments used for the daemon process.
8 | # The setting is particularly useful for tweaking memory settings.
9 | org.gradle.jvmargs=-Xmx1536m
10 | # When configured, Gradle will run in incubating parallel mode.
11 | # This option should only be used with decoupled projects. More details, visit
12 | # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
13 | # org.gradle.parallel=true
14 |
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/gradle/wrapper/gradle-wrapper.properties:
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1 | #Sat May 26 10:28:15 MSK 2018
2 | distributionBase=GRADLE_USER_HOME
3 | distributionPath=wrapper/dists
4 | zipStoreBase=GRADLE_USER_HOME
5 | zipStorePath=wrapper/dists
6 | distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-all.zip
7 |
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/settings.gradle:
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1 | include ':app', ':flow-layout-manager'
2 |
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