├── .gitignore
├── .idea
├── caches
│ └── build_file_checksums.ser
├── codeStyles
│ └── Project.xml
├── gradle.xml
├── misc.xml
├── modules.xml
├── runConfigurations.xml
└── vcs.xml
├── app
├── .gitignore
├── build.gradle
├── proguard-rules.pro
└── src
│ ├── androidTest
│ └── java
│ │ └── com
│ │ └── dalvinlabs
│ │ └── recyclerviewmultiselect
│ │ └── ExampleInstrumentedTest.java
│ ├── main
│ ├── AndroidManifest.xml
│ ├── java
│ │ └── com
│ │ │ └── dalvinlabs
│ │ │ └── recyclerviewmultiselect
│ │ │ ├── Adapter.java
│ │ │ ├── MainActivity.java
│ │ │ ├── Product.java
│ │ │ └── ViewModel.java
│ └── res
│ │ ├── drawable-v24
│ │ └── ic_launcher_foreground.xml
│ │ ├── drawable
│ │ └── ic_launcher_background.xml
│ │ ├── layout
│ │ ├── activity_main.xml
│ │ └── item_recycler.xml
│ │ ├── menu
│ │ └── 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
│ │ ├── strings.xml
│ │ └── styles.xml
│ └── test
│ └── java
│ └── com
│ └── dalvinlabs
│ └── recyclerviewmultiselect
│ └── ExampleUnitTest.java
├── build.gradle
├── gradle.properties
├── gradle
└── wrapper
│ ├── gradle-wrapper.jar
│ └── gradle-wrapper.properties
├── gradlew
├── gradlew.bat
└── settings.gradle
/.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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/.idea/caches/build_file_checksums.ser:
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/app/.gitignore:
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1 | /build
2 |
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/app/build.gradle:
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1 | apply plugin: 'com.android.application'
2 |
3 | android {
4 | compileSdkVersion 'android-P'
5 | defaultConfig {
6 | applicationId "com.dalvinlabs.recyclerviewmultiselect"
7 | minSdkVersion 'P'
8 | targetSdkVersion 'P'
9 | versionCode 1
10 | versionName "1.0"
11 | testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
12 | }
13 | buildTypes {
14 | release {
15 | minifyEnabled false
16 | proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
17 | }
18 | }
19 | dataBinding {
20 | enabled = true
21 | }
22 | sourceSets { main { res.srcDirs = ['src/main/res', 'src/main/res/menu'] } }
23 | }
24 |
25 | dependencies {
26 | implementation 'com.android.support.constraint:constraint-layout:1.0.2'
27 | implementation 'com.android.support:appcompat-v7:28.0.0-alpha1'
28 | implementation "com.android.support:recyclerview-v7:28.0.0-alpha1"
29 | implementation "com.android.support:recyclerview-selection:28.0.0-alpha1"
30 | implementation "com.android.support:cardview-v7:28.0.0-alpha1"
31 | }
32 |
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/app/proguard-rules.pro:
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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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/app/src/androidTest/java/com/dalvinlabs/recyclerviewmultiselect/ExampleInstrumentedTest.java:
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1 | package com.dalvinlabs.recyclerviewmultiselect;
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 | * 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() throws Exception {
21 | // Context of the app under test.
22 | Context appContext = InstrumentationRegistry.getTargetContext();
23 |
24 | assertEquals("com.dalvinlabs.recyclerviewmultiselect", appContext.getPackageName());
25 | }
26 | }
27 |
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/app/src/main/AndroidManifest.xml:
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/app/src/main/java/com/dalvinlabs/recyclerviewmultiselect/Adapter.java:
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1 | package com.dalvinlabs.recyclerviewmultiselect;
2 |
3 | import android.support.annotation.NonNull;
4 | import android.support.annotation.Nullable;
5 | import android.support.v7.widget.RecyclerView;
6 | import android.view.LayoutInflater;
7 | import android.view.MotionEvent;
8 | import android.view.View;
9 | import android.view.ViewGroup;
10 | import androidx.recyclerview.selection.ItemDetailsLookup;
11 | import androidx.recyclerview.selection.ItemKeyProvider;
12 | import androidx.recyclerview.selection.SelectionTracker;
13 | import com.dalvinlabs.recyclerviewmultiselect.databinding.ItemRecyclerBinding;
14 | import java.util.List;
15 |
16 | public class Adapter extends RecyclerView.Adapter {
17 |
18 | private final List products;
19 | private SelectionTracker selectionTracker;
20 |
21 | Adapter(List products) {
22 | this.products = products;
23 | }
24 |
25 | public void setSelectionTracker(
26 | SelectionTracker selectionTracker) {
27 | this.selectionTracker = selectionTracker;
28 | }
29 |
30 | static class Details extends ItemDetailsLookup.ItemDetails {
31 |
32 | long position;
33 |
34 | Details() {
35 | }
36 |
37 | @Override
38 | public int getPosition() {
39 | return (int) position;
40 | }
41 |
42 | @Nullable
43 | @Override
44 | public Long getSelectionKey() {
45 | return position;
46 | }
47 |
48 | @Override
49 | public boolean inSelectionHotspot(@NonNull MotionEvent e) {
50 | return true;
51 | }
52 | }
53 |
54 | static class KeyProvider extends ItemKeyProvider {
55 |
56 | KeyProvider(RecyclerView.Adapter adapter) {
57 | super(ItemKeyProvider.SCOPE_MAPPED);
58 | }
59 |
60 | @Nullable
61 | @Override
62 | public Long getKey(int position) {
63 | return (long) position;
64 | }
65 |
66 | @Override
67 | public int getPosition(@NonNull Long key) {
68 | long value = key;
69 | return (int) value;
70 | }
71 | }
72 |
73 | static class DetailsLookup extends ItemDetailsLookup {
74 |
75 | private RecyclerView recyclerView;
76 |
77 | DetailsLookup(RecyclerView recyclerView) {
78 | this.recyclerView = recyclerView;
79 | }
80 |
81 | @Nullable
82 | @Override
83 | public ItemDetails getItemDetails(@NonNull MotionEvent e) {
84 | View view = recyclerView.findChildViewUnder(e.getX(), e.getY());
85 | if (view != null) {
86 | RecyclerView.ViewHolder viewHolder = recyclerView.getChildViewHolder(view);
87 | if (viewHolder instanceof MyViewHolder) {
88 | return ((MyViewHolder) viewHolder).getItemDetails();
89 | }
90 | }
91 | return null;
92 | }
93 | }
94 |
95 | static class Predicate extends SelectionTracker.SelectionPredicate {
96 |
97 | @Override
98 | public boolean canSetStateForKey(@NonNull Long key, boolean nextState) {
99 | return true;
100 | }
101 |
102 | @Override
103 | public boolean canSetStateAtPosition(int position, boolean nextState) {
104 | return true;
105 | }
106 |
107 | @Override
108 | public boolean canSelectMultiple() {
109 | return true;
110 | }
111 | }
112 |
113 | class MyViewHolder extends RecyclerView.ViewHolder {
114 |
115 | private ItemRecyclerBinding binding;
116 | private Details details;
117 |
118 | MyViewHolder(@NonNull ItemRecyclerBinding itemRecyclerBinding) {
119 | super(itemRecyclerBinding.getRoot());
120 | binding = itemRecyclerBinding;
121 | details = new Details();
122 | }
123 |
124 | void bind(ViewModel viewModel, int position) {
125 | details.position = position;
126 | binding.setViewModel(viewModel);
127 | binding.executePendingBindings();
128 | if (selectionTracker != null) {
129 | if (Adapter.this.selectionTracker.isSelected(details.getSelectionKey())) {
130 | binding.getViewModel().textColor.set(
131 | binding.getRoot().getContext().getColor(R.color.colorAccent));
132 | binding.getRoot().setActivated(true);
133 | } else {
134 | binding.getViewModel().textColor.set(
135 | binding.getRoot().getContext().getColor(R.color.colorPrimary));
136 | binding.getRoot().setActivated(false);
137 | }
138 | }
139 | }
140 |
141 | Details getItemDetails() {
142 | return details;
143 | }
144 | }
145 |
146 | @Override
147 | public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
148 | return new MyViewHolder(
149 | ItemRecyclerBinding.inflate(LayoutInflater.from(parent.getContext()), parent, false));
150 | }
151 |
152 | @Override
153 | public void onBindViewHolder(MyViewHolder holder, int position) {
154 | holder.bind(new ViewModel(products.get(position)), position);
155 | }
156 |
157 | @Override
158 | public int getItemCount() {
159 | return products.size();
160 | }
161 | }
162 |
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/app/src/main/java/com/dalvinlabs/recyclerviewmultiselect/MainActivity.java:
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1 | package com.dalvinlabs.recyclerviewmultiselect;
2 |
3 | import android.databinding.DataBindingUtil;
4 | import android.os.Bundle;
5 | import android.support.v7.app.AppCompatActivity;
6 | import android.view.Menu;
7 | import android.view.MenuItem;
8 | import android.widget.Toast;
9 | import androidx.recyclerview.selection.SelectionTracker;
10 | import androidx.recyclerview.selection.StorageStrategy;
11 | import com.dalvinlabs.recyclerviewmultiselect.databinding.ActivityMainBinding;
12 |
13 | public class MainActivity extends AppCompatActivity {
14 |
15 | private SelectionTracker selectionTracker;
16 |
17 | @Override
18 | protected void onCreate(Bundle savedInstanceState) {
19 | super.onCreate(savedInstanceState);
20 | ActivityMainBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
21 | Adapter adapter = new Adapter(Product.getProducts());
22 | binding.recyclerView.setAdapter(adapter);
23 | selectionTracker = new SelectionTracker.Builder<>("my_selection",
24 | binding.recyclerView,
25 | new Adapter.KeyProvider(binding.recyclerView.getAdapter()),
26 | new Adapter.DetailsLookup(binding.recyclerView),
27 | StorageStrategy.createLongStorage())
28 | .withSelectionPredicate(new Adapter.Predicate())
29 | .build();
30 | adapter.setSelectionTracker(selectionTracker);
31 | }
32 |
33 | @Override
34 | public boolean onCreateOptionsMenu(Menu menu) {
35 | getMenuInflater().inflate(R.menu.main, menu);
36 | return true;
37 | }
38 |
39 | @Override
40 | public boolean onOptionsItemSelected(MenuItem item) {
41 | int id = item.getItemId();
42 | if (id == R.id.action_selections) {
43 | Toast.makeText(this, selectionTracker.getSelection().toString(), Toast.LENGTH_LONG).show();
44 | }
45 | return super.onOptionsItemSelected(item);
46 | }
47 | }
48 |
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/app/src/main/java/com/dalvinlabs/recyclerviewmultiselect/Product.java:
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1 | package com.dalvinlabs.recyclerviewmultiselect;
2 |
3 | import java.util.ArrayList;
4 | import java.util.List;
5 |
6 | public class Product {
7 |
8 | public final String name;
9 | public final String size;
10 | public final String color;
11 | public final String price;
12 |
13 | public Product(String name, String size, String color, String price) {
14 | this.name = name;
15 | this.size = size;
16 | this.color = color;
17 | this.price = price;
18 | }
19 |
20 | public static List getProducts() {
21 | List list = new ArrayList<>();
22 | list.add(
23 | new Product("These are good socks", "This is small size", "This is a red color", "$10"));
24 | list.add(new Product("These are good shirts", "This is medium size", "This is a green color",
25 | "$20"));
26 | list.add(
27 | new Product("These are good shoes", "This is large size", "This is a blue color", "$30"));
28 | list.add(
29 | new Product("These are good pants", "This is large size", "This is a black color", "$40"));
30 | list.add(
31 | new Product("These are good socks", "This is small size", "This is a red color", "$10"));
32 | list.add(new Product("These are good shirts", "This is medium size", "This is a green color",
33 | "$20"));
34 | list.add(
35 | new Product("These are good shoes", "This is large size", "This is a blue color", "$30"));
36 | list.add(
37 | new Product("These are good pants", "This is large size", "This is a black color", "$40"));
38 |
39 | return list;
40 | }
41 | }
42 |
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/app/src/main/java/com/dalvinlabs/recyclerviewmultiselect/ViewModel.java:
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1 | package com.dalvinlabs.recyclerviewmultiselect;
2 |
3 | import android.databinding.ObservableInt;
4 |
5 | public class ViewModel {
6 |
7 | public final String name;
8 | public final String size;
9 | public final String color;
10 | public final String price;
11 |
12 | public final ObservableInt textColor = new ObservableInt(R.color.colorPrimary);
13 |
14 | public ViewModel(Product product) {
15 | this.name = product.name;
16 | this.size = product.size;
17 | this.color = product.color;
18 | this.price = product.price;
19 | }
20 | }
21 |
22 |
23 |
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