├── README.md
├── VegaLayoutManager
├── .gitignore
├── app
│ ├── .gitignore
│ ├── build.gradle
│ ├── proguard-rules.pro
│ └── src
│ │ ├── androidTest
│ │ └── java
│ │ │ └── com
│ │ │ └── stone
│ │ │ └── vega
│ │ │ └── ExampleInstrumentedTest.java
│ │ ├── main
│ │ ├── AndroidManifest.xml
│ │ ├── java
│ │ │ └── com
│ │ │ │ └── stone
│ │ │ │ └── vega
│ │ │ │ ├── MainActivity.java
│ │ │ │ ├── StockEntity.java
│ │ │ │ └── Utils.java
│ │ └── res
│ │ │ ├── drawable-xxhdpi
│ │ │ ├── down_green.png
│ │ │ └── up_red.png
│ │ │ ├── layout
│ │ │ ├── activity_main.xml
│ │ │ └── recycler_item.xml
│ │ │ ├── mipmap-hdpi
│ │ │ └── ic_launcher.png
│ │ │ ├── mipmap-mdpi
│ │ │ └── ic_launcher.png
│ │ │ ├── mipmap-xhdpi
│ │ │ └── ic_launcher.png
│ │ │ ├── mipmap-xxhdpi
│ │ │ └── ic_launcher.png
│ │ │ ├── mipmap-xxxhdpi
│ │ │ └── ic_launcher.png
│ │ │ ├── values-v21
│ │ │ └── dimens.xml
│ │ │ ├── values-w820dp
│ │ │ └── dimens.xml
│ │ │ └── values
│ │ │ ├── colors.xml
│ │ │ ├── dimens.xml
│ │ │ ├── strings.xml
│ │ │ └── styles.xml
│ │ └── test
│ │ └── java
│ │ └── com
│ │ └── stone
│ │ └── vega
│ │ └── ExampleUnitTest.java
├── build.gradle
├── gradle.properties
├── gradle
│ └── wrapper
│ │ ├── gradle-wrapper.jar
│ │ └── gradle-wrapper.properties
├── gradlew
├── gradlew.bat
├── library
│ ├── .gitignore
│ ├── build.gradle
│ ├── proguard-rules.pro
│ └── src
│ │ ├── androidTest
│ │ └── java
│ │ │ └── com
│ │ │ └── stone
│ │ │ └── vega
│ │ │ └── library
│ │ │ └── ExampleInstrumentedTest.java
│ │ ├── main
│ │ ├── AndroidManifest.xml
│ │ ├── java
│ │ │ └── com
│ │ │ │ └── stone
│ │ │ │ └── vega
│ │ │ │ └── library
│ │ │ │ ├── StartSnapHelper.java
│ │ │ │ └── VegaLayoutManager.java
│ │ └── res
│ │ │ └── values
│ │ │ └── strings.xml
│ │ └── test
│ │ └── java
│ │ └── com
│ │ └── stone
│ │ └── vega
│ │ └── library
│ │ └── ExampleUnitTest.java
└── settings.gradle
├── app-debug.apk
├── capture.gif
└── capture2.png
/README.md:
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1 | # VegaLayoutManager
2 | a customized LayoutManager - fade and shrink the head itemView when scrolling.
3 |
4 | ### 实现效果
5 | 
![]()
6 | Dribbble设计：[链接](https://dribbble.com/shots/3793079-iPhone-8-iOS-11)
7 | IOS实现：[VegaScroll](https://github.com/AppliKeySolutions/VegaScroll)
8 |
9 | ### 代码思路
10 | RecyclerView最顶部的itemView，会随着手指滑动实现收缩隐藏与放大显示，并伴随recycler的回收与复用。
11 | 代码比较简单粗暴，使用自定义的LayoutManger，内置SnapHelper。
12 | 由于想要在任意时刻都能snap到第一个子View，所以在LayoutManager中用了比较讨巧的方法去设定scroll的最大值。
13 |
14 | ### 使用方法
15 | 1. gradle引入
16 | ```gradle
17 | compile 'com.stone.vega.library:VegaLayoutManager:1.0.1'
18 | ```
19 | 2. java文件中设定LayoutManager
20 | ```java
21 | recyclerView.setLayoutManager(new VegaLayoutManager());
22 | ```
23 |
24 | ### demo下载
25 | [点击下载](https://github.com/xmuSistone/VegaLayoutManager/blob/master/app-debug.apk?raw=true)
26 |
27 |
28 | ### License
29 |
30 | Copyright 2017, xmuSistone
31 |
32 | Licensed under the Apache License, Version 2.0 (the "License");
33 | you may not use this file except in compliance with the License.
34 | You may obtain a copy of the License at
35 |
36 | http://www.apache.org/licenses/LICENSE-2.0
37 |
38 | Unless required by applicable law or agreed to in writing, software
39 | distributed under the License is distributed on an "AS IS" BASIS,
40 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
41 | See the License for the specific language governing permissions and
42 | limitations under the License.
43 |
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/VegaLayoutManager/.gitignore:
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1 | *.iml
2 | .gradle
3 | /local.properties
4 | /.idea/workspace.xml
5 | /.idea/libraries
6 | .DS_Store
7 | /build
8 | /captures
9 | .externalNativeBuild
10 |
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/VegaLayoutManager/app/.gitignore:
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1 | /build
2 |
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/VegaLayoutManager/app/build.gradle:
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1 | apply plugin: 'com.android.application'
2 |
3 | android {
4 | compileSdkVersion 25
5 | buildToolsVersion "25.0.3"
6 | defaultConfig {
7 | applicationId "com.stone.vega"
8 | minSdkVersion 14
9 | targetSdkVersion 25
10 | versionCode 1
11 | versionName "1.0"
12 | testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
13 | }
14 | buildTypes {
15 | release {
16 | minifyEnabled false
17 | proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
18 | }
19 | }
20 | }
21 |
22 | dependencies {
23 | compile fileTree(include: ['*.jar'], dir: 'libs')
24 | androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
25 | exclude group: 'com.android.support', module: 'support-annotations'
26 | })
27 | compile 'com.android.support:appcompat-v7:25.3.1'
28 | compile 'com.android.support:design:25.3.1'
29 | compile 'com.android.support:cardview-v7:25.3.1'
30 | testCompile 'junit:junit:4.12'
31 | compile project(':library')
32 | }
33 |
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/VegaLayoutManager/app/proguard-rules.pro:
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1 | # Add project specific ProGuard rules here.
2 | # By default, the flags in this file are appended to flags specified
3 | # in D:\adt-bundle-windows-x86-20130917\sdk/tools/proguard/proguard-android.txt
4 | # You can edit the include path and order by changing the proguardFiles
5 | # directive in build.gradle.
6 | #
7 | # For more details, see
8 | # http://developer.android.com/guide/developing/tools/proguard.html
9 |
10 | # Add any project specific keep options here:
11 |
12 | # If your project uses WebView with JS, uncomment the following
13 | # and specify the fully qualified class name to the JavaScript interface
14 | # class:
15 | #-keepclassmembers class fqcn.of.javascript.interface.for.webview {
16 | # public *;
17 | #}
18 |
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/VegaLayoutManager/app/src/androidTest/java/com/stone/vega/ExampleInstrumentedTest.java:
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1 | package com.stone.vega;
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.*;
11 |
12 | /**
13 | * Instrumentation 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() throws Exception {
21 | // Context of the app under test.
22 | Context appContext = InstrumentationRegistry.getTargetContext();
23 |
24 | assertEquals("com.stone.vega", appContext.getPackageName());
25 | }
26 | }
27 |
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/VegaLayoutManager/app/src/main/AndroidManifest.xml:
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/VegaLayoutManager/app/src/main/java/com/stone/vega/MainActivity.java:
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1 | package com.stone.vega;
2 |
3 | import android.graphics.Color;
4 | import android.os.Bundle;
5 | import android.support.v7.app.AppCompatActivity;
6 | import android.support.v7.widget.RecyclerView;
7 | import android.support.v7.widget.Toolbar;
8 | import android.view.LayoutInflater;
9 | import android.view.MenuItem;
10 | import android.view.View;
11 | import android.view.ViewGroup;
12 | import android.widget.ImageView;
13 | import android.widget.TextView;
14 |
15 | import com.stone.vega.library.VegaLayoutManager;
16 |
17 | import java.util.ArrayList;
18 | import java.util.List;
19 |
20 | public class MainActivity extends AppCompatActivity {
21 |
22 | private List dataList = new ArrayList<>();
23 | private int redColor, greenColor;
24 |
25 | @Override
26 | protected void onCreate(Bundle savedInstanceState) {
27 | super.onCreate(savedInstanceState);
28 | setContentView(R.layout.activity_main);
29 |
30 | // 1. 沉浸式状态栏 + dark模式
31 | View positionView = findViewById(R.id.main_position_view);
32 | boolean immerse = Utils.immerseStatusBar(this);
33 | boolean darkMode = Utils.setDarkMode(this);
34 | if (immerse) {
35 | ViewGroup.LayoutParams lp = positionView.getLayoutParams();
36 | lp.height = Utils.getStatusBarHeight(this);
37 | positionView.setLayoutParams(lp);
38 | if (!darkMode) {
39 | positionView.setBackgroundColor(Color.BLACK);
40 | }
41 | } else {
42 | positionView.setVisibility(View.GONE);
43 | }
44 |
45 | // 2. toolbar
46 | Toolbar toolbar = (Toolbar) findViewById(R.id.main_toolbar);
47 | setSupportActionBar(toolbar);
48 | getSupportActionBar().setDisplayHomeAsUpEnabled(true);
49 |
50 | // 3. recyclerView数据填充
51 | RecyclerView recyclerView = (RecyclerView) findViewById(R.id.main_recycler_view);
52 | recyclerView.setLayoutManager(new VegaLayoutManager());
53 | RecyclerView.Adapter adapter = getAdapter();
54 | recyclerView.setAdapter(adapter);
55 |
56 | redColor = getResources().getColor(R.color.red);
57 | greenColor = getResources().getColor(R.color.green);
58 |
59 | prepareDataList();
60 | adapter.notifyDataSetChanged();
61 | }
62 |
63 | private void prepareDataList() {
64 | for (int i = 0; i < 5; i++) {
65 | dataList.add(new StockEntity("Google Inc.", 921.59f, 1, "+6.59 (+0.72%)"));
66 | dataList.add(new StockEntity("Apple Inc.", 158.73f, 1, "+0.06 (+0.04%)"));
67 | dataList.add(new StockEntity("Vmware Inc.", 109.74f, -1, "-0.24 (-0.22%)"));
68 | dataList.add(new StockEntity("Microsoft Inc.", 75.44f, 1, "+0.28 (+0.37%)"));
69 | dataList.add(new StockEntity("Facebook Inc.", 172.52f, 1, "+2.51 (+1.48%)"));
70 | dataList.add(new StockEntity("IBM Inc.", 144.40f, -1, "-0.15 (-0.10%)"));
71 | dataList.add(new StockEntity("Alibaba Inc.", 180.04f, 1, "+0.06 (+0.03%)"));
72 | dataList.add(new StockEntity("Tencent Inc.", 346.400f, 1, "+2.200 (+0.64%)"));
73 | dataList.add(new StockEntity("Baidu Inc.", 237.92f, -1, "-1.15 (-0.48%)"));
74 | dataList.add(new StockEntity("Amazon Inc.", 969.47f, -1, "-4.72 (-0.48%)"));
75 | dataList.add(new StockEntity("Oracle Inc.", 48.03f, -1, "-0.30 (-0.62%)"));
76 | dataList.add(new StockEntity("Intel Inc.", 37.22f, 1, "+0.22 (+0.61%)"));
77 | dataList.add(new StockEntity("Cisco Systems Inc.", 32.49f, -1, "-0.03 (-0.08%)"));
78 | dataList.add(new StockEntity("Qualcomm Inc.", 52.30f, 1, "+0.05 (+0.10%)"));
79 | dataList.add(new StockEntity("Sony Inc.", 37.65f, -1, "-0.74 (-1.93%)"));
80 | }
81 | }
82 |
83 | @Override
84 | public boolean onOptionsItemSelected(MenuItem item) {
85 | switch (item.getItemId()) {
86 | case android.R.id.home:// 点击返回图标事件
87 | finish();
88 | default:
89 | return super.onOptionsItemSelected(item);
90 | }
91 | }
92 |
93 | private RecyclerView.Adapter getAdapter() {
94 | final LayoutInflater inflater = LayoutInflater.from(this);
95 | RecyclerView.Adapter adapter = new RecyclerView.Adapter() {
96 | @Override
97 | public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
98 | View view = inflater.inflate(R.layout.recycler_item, parent, false);
99 | return new MyViewHolder(view);
100 | }
101 |
102 | @Override
103 | public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
104 | MyViewHolder myHolder = (MyViewHolder) holder;
105 | myHolder.bindData(dataList.get(position));
106 | }
107 |
108 | @Override
109 | public int getItemCount() {
110 | return dataList.size();
111 | }
112 | };
113 | return adapter;
114 | }
115 |
116 | class MyViewHolder extends RecyclerView.ViewHolder {
117 |
118 | TextView nameTv;
119 | TextView currentPriceTv;
120 | ImageView trendFlagIv;
121 | TextView grossTv;
122 |
123 | public MyViewHolder(View itemView) {
124 | super(itemView);
125 | this.nameTv = (TextView) itemView.findViewById(R.id.item_name_tv);
126 | this.currentPriceTv = (TextView) itemView.findViewById(R.id.item_current_price);
127 | this.trendFlagIv = (ImageView) itemView.findViewById(R.id.item_trend_flag);
128 | this.grossTv = (TextView) itemView.findViewById(R.id.item_gross);
129 | }
130 |
131 | public void bindData(StockEntity stockEntity) {
132 | nameTv.setText(stockEntity.getName());
133 | currentPriceTv.setText("$" + stockEntity.getPrice());
134 | trendFlagIv.setImageResource(stockEntity.getFlag() > 0 ? R.drawable.up_red : R.drawable.down_green);
135 | grossTv.setText(stockEntity.getGross());
136 | grossTv.setTextColor(stockEntity.getFlag() > 0 ? redColor : greenColor);
137 | }
138 | }
139 | }
140 |
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/VegaLayoutManager/app/src/main/java/com/stone/vega/StockEntity.java:
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1 | package com.stone.vega;
2 |
3 | /**
4 | * Created by xmuSistone on 2017/9/20.
5 | */
6 |
7 | public class StockEntity {
8 |
9 | private String name;
10 | private float price;
11 | private int flag;
12 | private String gross;
13 |
14 | public StockEntity(String name, float price, int flag, String gross) {
15 | this.name = name;
16 | this.price = price;
17 | this.flag = flag;
18 | this.gross = gross;
19 | }
20 |
21 | public String getName() {
22 | return name;
23 | }
24 |
25 | public float getPrice() {
26 | return price;
27 | }
28 |
29 | public int getFlag() {
30 | return flag;
31 | }
32 |
33 | public String getGross() {
34 | return gross;
35 | }
36 | }
37 |
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/VegaLayoutManager/app/src/main/java/com/stone/vega/Utils.java:
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1 | package com.stone.vega;
2 |
3 | import android.app.Activity;
4 | import android.content.Context;
5 | import android.graphics.Color;
6 | import android.os.Build;
7 | import android.view.View;
8 | import android.view.Window;
9 | import android.view.WindowManager;
10 |
11 | import java.lang.reflect.Field;
12 | import java.lang.reflect.Method;
13 |
14 | public class Utils {
15 |
16 | public static int getStatusBarHeight(Context context) {
17 | Class c = null;
18 | Object obj = null;
19 | Field field = null;
20 | int x = 0, statusBarHeight = 0;
21 | try {
22 | c = Class.forName("com.android.internal.R$dimen");
23 | obj = c.newInstance();
24 | field = c.getField("status_bar_height");
25 | x = Integer.parseInt(field.get(obj).toString());
26 | statusBarHeight = context.getResources().getDimensionPixelSize(x);
27 | } catch (Exception e1) {
28 | e1.printStackTrace();
29 | }
30 | return statusBarHeight;
31 | }
32 |
33 |
34 | /******************************以下代码段是为处理顶部状态栏的************************************/
35 |
36 | /**
37 | * 沉浸式状态栏
38 | */
39 | public static boolean immerseStatusBar(Activity activity) {
40 | boolean success = false;
41 | if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
42 | success = true;
43 | activity.getWindow().setStatusBarColor(Color.TRANSPARENT);
44 | activity.getWindow()
45 | .getDecorView()
46 | .setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
47 | } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
48 | success = true;
49 | activity.getWindow()
50 | .setFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS, WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
51 | }
52 | return success;
53 | }
54 |
55 | public static boolean setDarkMode(Activity activity) {
56 | return setDarkMode(activity, true);
57 | }
58 |
59 | /**
60 | * darkMode设置
61 | *
62 | * @return 是否成功
63 | */
64 | public static boolean setDarkMode(Activity activity, boolean darkMode) {
65 | String brand = Build.BRAND;
66 | boolean success = false;
67 | if (brand.contains("Xiaomi")) {
68 | success = setXiaomiDarkMode(activity, darkMode);
69 | } else if (brand.contains("Meizu")) {
70 | success = setMeizuDarkMode(activity, darkMode);
71 | } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
72 | final int lFlags = activity.getWindow().getDecorView().getSystemUiVisibility();
73 | activity.getWindow().getDecorView().setSystemUiVisibility(darkMode ? (lFlags | View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR) : (lFlags & ~View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR));
74 | success = true;
75 | }
76 |
77 | return success;
78 | }
79 |
80 | private static boolean setXiaomiDarkMode(Activity activity, boolean darkmode) {
81 | Class clazz = activity.getWindow().getClass();
82 | try {
83 | int darkModeFlag = 0;
84 | Class layoutParams = Class.forName("android.view.MiuiWindowManager$LayoutParams");
85 | Field field = layoutParams.getField("EXTRA_FLAG_STATUS_BAR_DARK_MODE");
86 | darkModeFlag = field.getInt(layoutParams);
87 | Method extraFlagField = clazz.getMethod("setExtraFlags", int.class, int.class);
88 | extraFlagField.invoke(activity.getWindow(), darkmode ? darkModeFlag : 0, darkModeFlag);
89 | return true;
90 | } catch (Exception e) {
91 | e.printStackTrace();
92 | }
93 | return false;
94 | }
95 |
96 | private static boolean setMeizuDarkMode(Activity activity, boolean dark) {
97 | boolean result = false;
98 | if (activity != null) {
99 | try {
100 | WindowManager.LayoutParams lp = activity.getWindow().getAttributes();
101 | Field darkFlag = WindowManager.LayoutParams.class
102 | .getDeclaredField("MEIZU_FLAG_DARK_STATUS_BAR_ICON");
103 | Field meizuFlags = WindowManager.LayoutParams.class
104 | .getDeclaredField("meizuFlags");
105 | darkFlag.setAccessible(true);
106 | meizuFlags.setAccessible(true);
107 | int bit = darkFlag.getInt(null);
108 | int value = meizuFlags.getInt(lp);
109 | if (dark) {
110 | value |= bit;
111 | } else {
112 | value &= ~bit;
113 | }
114 | meizuFlags.setInt(lp, value);
115 | activity.getWindow().setAttributes(lp);
116 | result = true;
117 | } catch (Exception e) {
118 | }
119 | }
120 | return result;
121 | }
122 | }
123 |
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/VegaLayoutManager/app/src/main/res/drawable-xxhdpi/down_green.png:
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https://raw.githubusercontent.com/iammert/VegaLayoutManager/413ef925713d1eaa14f9451110d0f6a8e2680edf/VegaLayoutManager/app/src/main/res/drawable-xxhdpi/down_green.png
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/VegaLayoutManager/app/src/main/res/drawable-xxhdpi/up_red.png:
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https://raw.githubusercontent.com/iammert/VegaLayoutManager/413ef925713d1eaa14f9451110d0f6a8e2680edf/VegaLayoutManager/app/src/main/res/drawable-xxhdpi/up_red.png
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/VegaLayoutManager/app/src/main/res/layout/activity_main.xml:
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/VegaLayoutManager/app/src/main/res/layout/recycler_item.xml:
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/VegaLayoutManager/app/src/main/res/mipmap-hdpi/ic_launcher.png:
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https://raw.githubusercontent.com/iammert/VegaLayoutManager/413ef925713d1eaa14f9451110d0f6a8e2680edf/VegaLayoutManager/app/src/main/res/mipmap-hdpi/ic_launcher.png
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/VegaLayoutManager/app/src/main/res/mipmap-mdpi/ic_launcher.png:
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/VegaLayoutManager/app/src/main/res/mipmap-xhdpi/ic_launcher.png:
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/VegaLayoutManager/app/src/main/res/mipmap-xxhdpi/ic_launcher.png:
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/VegaLayoutManager/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png:
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/VegaLayoutManager/app/src/main/res/values-v21/dimens.xml:
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4 | 16dp
5 | 6dp
6 | 10dp
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/VegaLayoutManager/app/src/main/res/values-w820dp/dimens.xml:
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5 | 64dp
6 |
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/VegaLayoutManager/app/src/main/res/values/colors.xml:
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3 | #3F51B5
4 | #303F9F
5 | #FF4081
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7 | #17bb0b
8 | #e50b1f
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/VegaLayoutManager/app/src/main/res/values/dimens.xml:
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3 | 10dp
4 | 1dp
5 | 2dp
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/VegaLayoutManager/app/src/main/res/values/strings.xml:
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2 | VegaLayoutManager
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/VegaLayoutManager/app/src/main/res/values/styles.xml:
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1 |
2 |
3 |
4 |
10 |
11 |
12 |
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/VegaLayoutManager/app/src/test/java/com/stone/vega/ExampleUnitTest.java:
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1 | package com.stone.vega;
2 |
3 | import org.junit.Test;
4 |
5 | import static org.junit.Assert.*;
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() throws Exception {
15 | assertEquals(4, 2 + 2);
16 | }
17 | }
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/VegaLayoutManager/build.gradle:
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1 | // Top-level build file where you can add configuration options common to all sub-projects/modules.
2 |
3 | buildscript {
4 | repositories {
5 | jcenter()
6 | }
7 | dependencies {
8 | classpath 'com.android.tools.build:gradle:2.2.3'
9 |
10 | classpath 'com.android.tools.build:gradle:1.2.3'
11 | classpath 'com.novoda:bintray-release:0.3.4'
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 | jcenter()
21 | }
22 | }
23 |
24 | task clean(type: Delete) {
25 | delete rootProject.buildDir
26 | }
27 |
28 | tasks.getByPath(":library:mavenAndroidJavadocs").enabled = false
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/VegaLayoutManager/gradle.properties:
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1 | # Project-wide Gradle settings.
2 |
3 | # IDE (e.g. Android Studio) users:
4 | # Gradle settings configured through the IDE *will override*
5 | # any settings specified in this file.
6 |
7 | # For more details on how to configure your build environment visit
8 | # http://www.gradle.org/docs/current/userguide/build_environment.html
9 |
10 | # Specifies the JVM arguments used for the daemon process.
11 | # The setting is particularly useful for tweaking memory settings.
12 | org.gradle.jvmargs=-Xmx1536m
13 |
14 | # When configured, Gradle will run in incubating parallel mode.
15 | # This option should only be used with decoupled projects. More details, visit
16 | # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
17 | # org.gradle.parallel=true
18 |
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/VegaLayoutManager/gradle/wrapper/gradle-wrapper.jar:
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https://raw.githubusercontent.com/iammert/VegaLayoutManager/413ef925713d1eaa14f9451110d0f6a8e2680edf/VegaLayoutManager/gradle/wrapper/gradle-wrapper.jar
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/VegaLayoutManager/gradle/wrapper/gradle-wrapper.properties:
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1 | #Mon Dec 28 10:00:20 PST 2015
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-2.14.1-all.zip
7 |
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/VegaLayoutManager/gradlew:
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1 | #!/usr/bin/env bash
2 |
3 | ##############################################################################
4 | ##
5 | ## Gradle start up script for UN*X
6 | ##
7 | ##############################################################################
8 |
9 | # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
10 | DEFAULT_JVM_OPTS=""
11 |
12 | APP_NAME="Gradle"
13 | APP_BASE_NAME=`basename "$0"`
14 |
15 | # Use the maximum available, or set MAX_FD != -1 to use that value.
16 | MAX_FD="maximum"
17 |
18 | warn ( ) {
19 | echo "$*"
20 | }
21 |
22 | die ( ) {
23 | echo
24 | echo "$*"
25 | echo
26 | exit 1
27 | }
28 |
29 | # OS specific support (must be 'true' or 'false').
30 | cygwin=false
31 | msys=false
32 | darwin=false
33 | case "`uname`" in
34 | CYGWIN* )
35 | cygwin=true
36 | ;;
37 | Darwin* )
38 | darwin=true
39 | ;;
40 | MINGW* )
41 | msys=true
42 | ;;
43 | esac
44 |
45 | # Attempt to set APP_HOME
46 | # Resolve links: $0 may be a link
47 | PRG="$0"
48 | # Need this for relative symlinks.
49 | while [ -h "$PRG" ] ; do
50 | ls=`ls -ld "$PRG"`
51 | link=`expr "$ls" : '.*-> \(.*\)$'`
52 | if expr "$link" : '/.*' > /dev/null; then
53 | PRG="$link"
54 | else
55 | PRG=`dirname "$PRG"`"/$link"
56 | fi
57 | done
58 | SAVED="`pwd`"
59 | cd "`dirname \"$PRG\"`/" >/dev/null
60 | APP_HOME="`pwd -P`"
61 | cd "$SAVED" >/dev/null
62 |
63 | CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
64 |
65 | # Determine the Java command to use to start the JVM.
66 | if [ -n "$JAVA_HOME" ] ; then
67 | if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
68 | # IBM's JDK on AIX uses strange locations for the executables
69 | JAVACMD="$JAVA_HOME/jre/sh/java"
70 | else
71 | JAVACMD="$JAVA_HOME/bin/java"
72 | fi
73 | if [ ! -x "$JAVACMD" ] ; then
74 | die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
75 |
76 | Please set the JAVA_HOME variable in your environment to match the
77 | location of your Java installation."
78 | fi
79 | else
80 | JAVACMD="java"
81 | which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
82 |
83 | Please set the JAVA_HOME variable in your environment to match the
84 | location of your Java installation."
85 | fi
86 |
87 | # Increase the maximum file descriptors if we can.
88 | if [ "$cygwin" = "false" -a "$darwin" = "false" ] ; then
89 | MAX_FD_LIMIT=`ulimit -H -n`
90 | if [ $? -eq 0 ] ; then
91 | if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
92 | MAX_FD="$MAX_FD_LIMIT"
93 | fi
94 | ulimit -n $MAX_FD
95 | if [ $? -ne 0 ] ; then
96 | warn "Could not set maximum file descriptor limit: $MAX_FD"
97 | fi
98 | else
99 | warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
100 | fi
101 | fi
102 |
103 | # For Darwin, add options to specify how the application appears in the dock
104 | if $darwin; then
105 | GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
106 | fi
107 |
108 | # For Cygwin, switch paths to Windows format before running java
109 | if $cygwin ; then
110 | APP_HOME=`cygpath --path --mixed "$APP_HOME"`
111 | CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
112 | JAVACMD=`cygpath --unix "$JAVACMD"`
113 |
114 | # We build the pattern for arguments to be converted via cygpath
115 | ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
116 | SEP=""
117 | for dir in $ROOTDIRSRAW ; do
118 | ROOTDIRS="$ROOTDIRS$SEP$dir"
119 | SEP="|"
120 | done
121 | OURCYGPATTERN="(^($ROOTDIRS))"
122 | # Add a user-defined pattern to the cygpath arguments
123 | if [ "$GRADLE_CYGPATTERN" != "" ] ; then
124 | OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
125 | fi
126 | # Now convert the arguments - kludge to limit ourselves to /bin/sh
127 | i=0
128 | for arg in "$@" ; do
129 | CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
130 | CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option
131 |
132 | if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition
133 | eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
134 | else
135 | eval `echo args$i`="\"$arg\""
136 | fi
137 | i=$((i+1))
138 | done
139 | case $i in
140 | (0) set -- ;;
141 | (1) set -- "$args0" ;;
142 | (2) set -- "$args0" "$args1" ;;
143 | (3) set -- "$args0" "$args1" "$args2" ;;
144 | (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
145 | (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
146 | (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
147 | (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
148 | (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
149 | (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
150 | esac
151 | fi
152 |
153 | # Split up the JVM_OPTS And GRADLE_OPTS values into an array, following the shell quoting and substitution rules
154 | function splitJvmOpts() {
155 | JVM_OPTS=("$@")
156 | }
157 | eval splitJvmOpts $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS
158 | JVM_OPTS[${#JVM_OPTS[*]}]="-Dorg.gradle.appname=$APP_BASE_NAME"
159 |
160 | exec "$JAVACMD" "${JVM_OPTS[@]}" -classpath "$CLASSPATH" org.gradle.wrapper.GradleWrapperMain "$@"
161 |
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/VegaLayoutManager/gradlew.bat:
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1 | @if "%DEBUG%" == "" @echo off
2 | @rem ##########################################################################
3 | @rem
4 | @rem Gradle startup script for Windows
5 | @rem
6 | @rem ##########################################################################
7 |
8 | @rem Set local scope for the variables with windows NT shell
9 | if "%OS%"=="Windows_NT" setlocal
10 |
11 | @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
12 | set DEFAULT_JVM_OPTS=
13 |
14 | set DIRNAME=%~dp0
15 | if "%DIRNAME%" == "" set DIRNAME=.
16 | set APP_BASE_NAME=%~n0
17 | set APP_HOME=%DIRNAME%
18 |
19 | @rem Find java.exe
20 | if defined JAVA_HOME goto findJavaFromJavaHome
21 |
22 | set JAVA_EXE=java.exe
23 | %JAVA_EXE% -version >NUL 2>&1
24 | if "%ERRORLEVEL%" == "0" goto init
25 |
26 | echo.
27 | echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
28 | echo.
29 | echo Please set the JAVA_HOME variable in your environment to match the
30 | echo location of your Java installation.
31 |
32 | goto fail
33 |
34 | :findJavaFromJavaHome
35 | set JAVA_HOME=%JAVA_HOME:"=%
36 | set JAVA_EXE=%JAVA_HOME%/bin/java.exe
37 |
38 | if exist "%JAVA_EXE%" goto init
39 |
40 | echo.
41 | echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
42 | echo.
43 | echo Please set the JAVA_HOME variable in your environment to match the
44 | echo location of your Java installation.
45 |
46 | goto fail
47 |
48 | :init
49 | @rem Get command-line arguments, handling Windowz variants
50 |
51 | if not "%OS%" == "Windows_NT" goto win9xME_args
52 | if "%@eval[2+2]" == "4" goto 4NT_args
53 |
54 | :win9xME_args
55 | @rem Slurp the command line arguments.
56 | set CMD_LINE_ARGS=
57 | set _SKIP=2
58 |
59 | :win9xME_args_slurp
60 | if "x%~1" == "x" goto execute
61 |
62 | set CMD_LINE_ARGS=%*
63 | goto execute
64 |
65 | :4NT_args
66 | @rem Get arguments from the 4NT Shell from JP Software
67 | set CMD_LINE_ARGS=%$
68 |
69 | :execute
70 | @rem Setup the command line
71 |
72 | set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
73 |
74 | @rem Execute Gradle
75 | "%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
76 |
77 | :end
78 | @rem End local scope for the variables with windows NT shell
79 | if "%ERRORLEVEL%"=="0" goto mainEnd
80 |
81 | :fail
82 | rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
83 | rem the _cmd.exe /c_ return code!
84 | if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
85 | exit /b 1
86 |
87 | :mainEnd
88 | if "%OS%"=="Windows_NT" endlocal
89 |
90 | :omega
91 |
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/VegaLayoutManager/library/.gitignore:
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1 | /build
2 |
--------------------------------------------------------------------------------
/VegaLayoutManager/library/build.gradle:
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1 | apply plugin: 'com.android.library'
2 | apply plugin: 'com.novoda.bintray-release'
3 |
4 | android {
5 | compileSdkVersion 25
6 | buildToolsVersion "25.0.3"
7 |
8 | defaultConfig {
9 | minSdkVersion 14
10 | targetSdkVersion 25
11 | versionCode 101
12 | versionName "1.0.1"
13 |
14 | testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
15 |
16 | }
17 | buildTypes {
18 | release {
19 | minifyEnabled false
20 | proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
21 | }
22 | }
23 | }
24 |
25 | dependencies {
26 | compile fileTree(dir: 'libs', include: ['*.jar'])
27 | androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
28 | exclude group: 'com.android.support', module: 'support-annotations'
29 | })
30 | compile 'com.android.support:appcompat-v7:25.3.1'
31 | compile 'com.android.support:design:25.3.1'
32 | testCompile 'junit:junit:4.12'
33 | }
34 |
35 |
36 |
37 | publish {
38 | userOrg = 'xmuzll'
39 | groupId = 'com.stone.vega.library'
40 | artifactId = 'VegaLayoutManager'
41 | publishVersion = '1.0.1'
42 | desc = 'Vega Layout'
43 | website = 'https://github.com/xmuSistone/VegaLayoutManager'
44 | }
45 |
46 | // .gradlew clean build bintrayUpload -PbintrayUser=xmuzll -PbintrayKey=xxxxxxxxxxxxxxxxxxxxxx -PdryRun=false
47 |
48 |
49 |
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/VegaLayoutManager/library/proguard-rules.pro:
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1 | # Add project specific ProGuard rules here.
2 | # By default, the flags in this file are appended to flags specified
3 | # in D:\adt-bundle-windows-x86-20130917\sdk/tools/proguard/proguard-android.txt
4 | # You can edit the include path and order by changing the proguardFiles
5 | # directive in build.gradle.
6 | #
7 | # For more details, see
8 | # http://developer.android.com/guide/developing/tools/proguard.html
9 |
10 | # Add any project specific keep options here:
11 |
12 | # If your project uses WebView with JS, uncomment the following
13 | # and specify the fully qualified class name to the JavaScript interface
14 | # class:
15 | #-keepclassmembers class fqcn.of.javascript.interface.for.webview {
16 | # public *;
17 | #}
18 |
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/VegaLayoutManager/library/src/androidTest/java/com/stone/vega/library/ExampleInstrumentedTest.java:
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1 | package com.stone.vega.library;
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.*;
11 |
12 | /**
13 | * Instrumentation 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() throws Exception {
21 | // Context of the app under test.
22 | Context appContext = InstrumentationRegistry.getTargetContext();
23 |
24 | assertEquals("com.stone.vega.library.test", appContext.getPackageName());
25 | }
26 | }
27 |
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/VegaLayoutManager/library/src/main/AndroidManifest.xml:
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1 |
3 |
4 |
6 |
7 |
8 |
9 |
10 |
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/VegaLayoutManager/library/src/main/java/com/stone/vega/library/StartSnapHelper.java:
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1 | package com.stone.vega.library;
2 |
3 | import android.support.annotation.NonNull;
4 | import android.support.v7.widget.LinearSnapHelper;
5 | import android.support.v7.widget.RecyclerView;
6 | import android.view.View;
7 |
8 | /**
9 | * 定位到第一个子View的SnapHelper
10 | * Created by xmuSistone on 2017/9/19.
11 | */
12 | public class StartSnapHelper extends LinearSnapHelper {
13 |
14 | @Override
15 | public int[] calculateDistanceToFinalSnap(@NonNull RecyclerView.LayoutManager layoutManager,
16 | @NonNull View targetView) {
17 | int[] out = new int[2];
18 | out[0] = 0;
19 | out[1] = ((VegaLayoutManager) layoutManager).getSnapHeight();
20 | return out;
21 | }
22 |
23 | @Override
24 | public View findSnapView(RecyclerView.LayoutManager layoutManager) {
25 | VegaLayoutManager custLayoutManager = (VegaLayoutManager) layoutManager;
26 | return custLayoutManager.findSnapView();
27 | }
28 | }
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/VegaLayoutManager/library/src/main/java/com/stone/vega/library/VegaLayoutManager.java:
--------------------------------------------------------------------------------
1 | package com.stone.vega.library;
2 |
3 | import android.graphics.Rect;
4 | import android.support.v7.widget.RecyclerView;
5 | import android.util.SparseArray;
6 | import android.view.View;
7 | import android.view.ViewGroup;
8 |
9 | /**
10 | * Created by xmuSistone on 2017/9/20.
11 | */
12 | public class VegaLayoutManager extends RecyclerView.LayoutManager {
13 |
14 | private int mDecoratedMeasuredWidth;
15 | private int mDecoratedMeasuredHeight;
16 | private int scroll = 0;
17 | private SparseArray locationRects = new SparseArray<>();
18 | private SparseArray attachedItems = new SparseArray<>();
19 | private boolean needSnap = false;
20 | private int lastDy = 0;
21 | private int maxScroll = -1;
22 |
23 | @Override
24 | public RecyclerView.LayoutParams generateDefaultLayoutParams() {
25 | return new RecyclerView.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
26 | }
27 |
28 | @Override
29 | public void onLayoutChildren(RecyclerView.Recycler recycler, RecyclerView.State state) {
30 | super.onLayoutChildren(recycler, state);
31 | int itemCount = getItemCount();
32 | if (itemCount <= 0 || state.isPreLayout()) {
33 | return;
34 | }
35 |
36 | if (getChildCount() == 0) {
37 | // 通过第一个itemView，获取一些中间变量
38 | View itemView = recycler.getViewForPosition(0);
39 | addView(itemView);
40 | measureChildWithMargins(itemView, 0, 0);
41 | mDecoratedMeasuredWidth = getDecoratedMeasuredWidth(itemView);
42 | mDecoratedMeasuredHeight = getDecoratedMeasuredHeight(itemView);
43 | }
44 |
45 | int tempPosition = getPaddingTop();
46 | for (int i = 0; i < itemCount; i++) {
47 | Rect rect = new Rect();
48 | rect.left = getPaddingLeft();
49 | rect.top = tempPosition;
50 | rect.right = mDecoratedMeasuredWidth - getPaddingRight();
51 | rect.bottom = rect.top + mDecoratedMeasuredHeight;
52 | locationRects.put(i, rect);
53 | attachedItems.put(i, false);
54 |
55 | tempPosition = tempPosition + mDecoratedMeasuredHeight;
56 | }
57 |
58 | // 得到中间变量后，第一个View先回收放到缓存，后面会再次统一layout
59 | detachAndScrapAttachedViews(recycler);
60 | layoutItemsOnCreate(recycler);
61 | computeMaxScroll();
62 | }
63 |
64 |
65 | /**
66 | * 对外提供接口，找到第一个可视view的index
67 | */
68 | public int findFirstVisibleItemPosition() {
69 | int count = locationRects.size();
70 | Rect displayRect = new Rect(0, scroll, getWidth(), getHeight() + scroll);
71 | for (int i = 0; i < count; i++) {
72 | if (Rect.intersects(displayRect, locationRects.get(i)) &&
73 | attachedItems.get(i)) {
74 | return i;
75 | }
76 | }
77 | return 0;
78 | }
79 |
80 | /**
81 | * 计算可滑动的最大值
82 | */
83 | private void computeMaxScroll() {
84 | maxScroll = locationRects.get(locationRects.size() - 1).bottom - getHeight();
85 | if (maxScroll < 0) {
86 | maxScroll = 0;
87 | return;
88 | }
89 |
90 | int childCount = getChildCount();
91 | int screenFilledHeight = 0;
92 | for (int i = childCount - 1; i >= 0; i--) {
93 | Rect rect = locationRects.get(i);
94 | screenFilledHeight = screenFilledHeight + (rect.bottom - rect.top);
95 | if (screenFilledHeight > getHeight()) {
96 | int extraSnapHeight = getHeight() - (screenFilledHeight - (rect.bottom - rect.top));
97 | maxScroll = maxScroll + extraSnapHeight;
98 | break;
99 | }
100 | }
101 | }
102 |
103 | /**
104 | * 初始化的时候，layout子View
105 | */
106 | private void layoutItemsOnCreate(RecyclerView.Recycler recycler) {
107 | int itemCount = getItemCount();
108 |
109 | for (int i = 0; i < itemCount; i++) {
110 | View childView = recycler.getViewForPosition(i);
111 | addView(childView);
112 | measureChildWithMargins(childView, 0, 0);
113 | layoutItem(childView, locationRects.get(i));
114 | attachedItems.put(i, true);
115 | childView.setPivotY(0);
116 | childView.setPivotX(childView.getMeasuredWidth() / 2);
117 |
118 | if (locationRects.get(i).top > getHeight()) {
119 | break;
120 | }
121 | }
122 | }
123 |
124 |
125 | /**
126 | * 初始化的时候，layout子View
127 | */
128 | private void layoutItemsOnScroll(RecyclerView.Recycler recycler, RecyclerView.State state, int dy) {
129 | int childCount = getChildCount();
130 | if (state.isPreLayout() || childCount == 0) {
131 | return;
132 | }
133 |
134 | // 1. 已经在屏幕上显示的child
135 | int itemCount = getItemCount();
136 | Rect displayRect = new Rect(0, scroll, getWidth(), getHeight() + scroll);
137 | for (int i = 0; i < childCount; i++) {
138 | View child = getChildAt(i);
139 | if (child == null) {
140 | continue;
141 | }
142 | int position = getPosition(child);
143 | if (!Rect.intersects(displayRect, locationRects.get(position))) {
144 | // 回收滑出屏幕的View
145 | removeAndRecycleView(child, recycler);
146 | attachedItems.put(position, false);
147 | } else {
148 | // Item还在显示区域内，更新滑动后Item的位置
149 | layoutItem(child, locationRects.get(position)); //更新Item位置
150 | }
151 | }
152 |
153 | // 2. 复用View添加
154 | for (int i = 0; i < itemCount; i++) {
155 | if (Rect.intersects(displayRect, locationRects.get(i)) &&
156 | !attachedItems.get(i)) {
157 | // 重新加载可见范围内的Item
158 | View scrap = recycler.getViewForPosition(i);
159 | measureChildWithMargins(scrap, 0, 0);
160 | scrap.setPivotY(0);
161 | scrap.setPivotX(scrap.getMeasuredWidth() / 2);
162 | if (dy > 0) {
163 | addView(scrap);
164 | } else {
165 | addView(scrap, 0);
166 | }
167 | // 将这个Item布局出来
168 | layoutItem(scrap, locationRects.get(i));
169 | attachedItems.put(i, true);
170 | }
171 | }
172 | }
173 |
174 | private void layoutItem(View child, Rect rect) {
175 | int topDistance = scroll - rect.top;
176 | int layoutTop, layoutBottom;
177 | if (topDistance < mDecoratedMeasuredHeight && topDistance >= 0) {
178 | float rate1 = (float) topDistance / mDecoratedMeasuredHeight;
179 | float rate2 = 1 - rate1 * rate1 / 3;
180 | float rate3 = 1 - rate1 * rate1;
181 | child.setScaleX(rate2);
182 | child.setScaleY(rate2);
183 | child.setAlpha(rate3);
184 |
185 | layoutTop = 0;
186 | layoutBottom = mDecoratedMeasuredHeight;
187 | } else {
188 | child.setScaleX(1);
189 | child.setScaleY(1);
190 | child.setAlpha(1);
191 |
192 | layoutTop = rect.top - scroll;
193 | layoutBottom = rect.bottom - scroll;
194 | }
195 | layoutDecorated(child, rect.left, layoutTop, rect.right, layoutBottom);
196 | }
197 |
198 | @Override
199 | public boolean canScrollVertically() {
200 | return true;
201 | }
202 |
203 | @Override
204 | public int scrollVerticallyBy(int dy, RecyclerView.Recycler recycler, RecyclerView.State state) {
205 | if (getItemCount() == 0 || dy == 0) {
206 | return 0;
207 | }
208 | int travel = dy;
209 | if (dy + scroll < 0) {
210 | travel = -scroll;
211 | } else if (dy + scroll > maxScroll) {
212 | travel = maxScroll - scroll;
213 | }
214 | scroll += travel; //累计偏移量
215 | lastDy = dy;
216 | layoutItemsOnScroll(recycler, state, dy);
217 | return travel;
218 | }
219 |
220 | @Override
221 | public void onAttachedToWindow(RecyclerView view) {
222 | super.onAttachedToWindow(view);
223 | new StartSnapHelper().attachToRecyclerView(view);
224 | }
225 |
226 | @Override
227 | public void onScrollStateChanged(int state) {
228 | if (state == RecyclerView.SCROLL_STATE_DRAGGING) {
229 | needSnap = true;
230 | }
231 | super.onScrollStateChanged(state);
232 | }
233 |
234 | public int getSnapHeight() {
235 | if (!needSnap) {
236 | return 0;
237 | }
238 | needSnap = false;
239 |
240 | Rect displayRect = new Rect(0, scroll, getWidth(), getHeight() + scroll);
241 | int itemCount = getItemCount();
242 | for (int i = 0; i < itemCount; i++) {
243 | Rect itemRect = locationRects.get(i);
244 | if (displayRect.intersect(itemRect)) {
245 |
246 | if (lastDy > 0) {
247 | // scroll变大，属于列表往下走，往下找下一个为snapView
248 | if (i < itemCount - 1) {
249 | Rect nextRect = locationRects.get(i + 1);
250 | return nextRect.top - displayRect.top;
251 | }
252 | }
253 | return itemRect.top - displayRect.top;
254 | }
255 | }
256 | return 0;
257 | }
258 |
259 | public View findSnapView() {
260 | if (getChildCount() > 0) {
261 | return getChildAt(0);
262 | }
263 | return null;
264 | }
265 | }
266 |
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/VegaLayoutManager/library/src/main/res/values/strings.xml:
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1 |
2 | library
3 |
4 |
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/VegaLayoutManager/library/src/test/java/com/stone/vega/library/ExampleUnitTest.java:
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1 | package com.stone.vega.library;
2 |
3 | import org.junit.Test;
4 |
5 | import static org.junit.Assert.*;
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() throws Exception {
15 | assertEquals(4, 2 + 2);
16 | }
17 | }
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/VegaLayoutManager/settings.gradle:
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1 | include ':app', ':library'
2 |
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/app-debug.apk:
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https://raw.githubusercontent.com/iammert/VegaLayoutManager/413ef925713d1eaa14f9451110d0f6a8e2680edf/app-debug.apk
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/capture.gif:
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https://raw.githubusercontent.com/iammert/VegaLayoutManager/413ef925713d1eaa14f9451110d0f6a8e2680edf/capture.gif
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/capture2.png:
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https://raw.githubusercontent.com/iammert/VegaLayoutManager/413ef925713d1eaa14f9451110d0f6a8e2680edf/capture2.png
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