├── app ├── .gitignore ├── build.gradle ├── proguard-rules.pro └── src │ ├── androidTest │ └── java │ │ └── com │ │ └── xiashengming │ │ └── widget │ │ └── ExampleInstrumentedTest.java │ ├── main │ ├── AndroidManifest.xml │ ├── java │ │ └── com │ │ │ └── xiashengming │ │ │ └── widget │ │ │ ├── MainActivity.java │ │ │ └── looppagerecyclerview │ │ │ ├── LooperLayoutManager.java │ │ │ └── MyAdapter.java │ └── res │ │ ├── drawable-v24 │ │ └── ic_launcher_foreground.xml │ │ ├── drawable │ │ ├── ic_launcher_background.xml │ │ ├── pic1.jpg │ │ ├── pic2.jpg │ │ ├── pic5.jpg │ │ ├── pic6.jpg │ │ ├── pic_emotion_01.png │ │ ├── pic_emotion_02.png │ │ ├── pic_emotion_03.png │ │ ├── pic_emotion_04.png │ │ ├── pic_emotion_05.png │ │ ├── pic_emotion_06.png │ │ └── pic_emotion_07.png │ │ ├── layout │ │ ├── activity_main.xml │ │ └── item_view.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 │ └── xiashengming │ └── widget │ └── ExampleUnitTest.java ├── build.gradle ├── gradle.properties ├── gradle └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat └── settings.gradle /app/.gitignore: -------------------------------------------------------------------------------- 1 | /build 2 | -------------------------------------------------------------------------------- /app/build.gradle: -------------------------------------------------------------------------------- 1 | apply plugin: 'com.android.application' 2 | 3 | android { 4 | compileSdkVersion 28 5 | defaultConfig { 6 | applicationId "com.xiashengming.widget" 7 | minSdkVersion 15 8 | targetSdkVersion 28 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 | } 20 | 21 | dependencies { 22 | implementation fileTree(include: ['*.jar'], dir: 'libs') 23 | implementation 'com.android.support:appcompat-v7:28.0.0' 24 | implementation 'com.android.support.constraint:constraint-layout:1.1.3' 25 | testImplementation 'junit:junit:4.12' 26 | androidTestImplementation 'com.android.support.test:runner:1.0.2' 27 | androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2' 28 | implementation 'com.android.support:recyclerview-v7:28.0.0' 29 | } 30 | -------------------------------------------------------------------------------- /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/com/xiashengming/widget/ExampleInstrumentedTest.java: -------------------------------------------------------------------------------- 1 | package com.xiashengming.widget; 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() { 21 | // Context of the app under test. 22 | Context appContext = InstrumentationRegistry.getTargetContext(); 23 | 24 | assertEquals("com.xiashengming.widget", appContext.getPackageName()); 25 | } 26 | } 27 | -------------------------------------------------------------------------------- /app/src/main/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 2 | 4 | 5 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | -------------------------------------------------------------------------------- /app/src/main/java/com/xiashengming/widget/MainActivity.java: -------------------------------------------------------------------------------- 1 | package com.xiashengming.widget; 2 | 3 | import android.support.v7.app.AppCompatActivity; 4 | import android.os.Bundle; 5 | import android.support.v7.widget.RecyclerView; 6 | 7 | import com.xiashengming.widget.looppagerecyclerview.LooperLayoutManager; 8 | import com.xiashengming.widget.looppagerecyclerview.MyAdapter; 9 | import java.util.ArrayList; 10 | 11 | public class MainActivity extends AppCompatActivity { 12 | private ArrayList mList = new ArrayList<>(); 13 | private RecyclerView recyclerView; 14 | 15 | @Override 16 | protected void onCreate(Bundle savedInstanceState) { 17 | super.onCreate(savedInstanceState); 18 | setContentView(R.layout.activity_main); 19 | recyclerView = findViewById(R.id.recyclerview); 20 | recyclerView.setAdapter(new MyAdapter()); 21 | LooperLayoutManager layoutManager = new LooperLayoutManager(); 22 | layoutManager.setLooperEnable(true); 23 | recyclerView.setLayoutManager(layoutManager); 24 | } 25 | 26 | } 27 | -------------------------------------------------------------------------------- /app/src/main/java/com/xiashengming/widget/looppagerecyclerview/LooperLayoutManager.java: -------------------------------------------------------------------------------- 1 | package com.xiashengming.widget.looppagerecyclerview; 2 | 3 | import android.support.v7.widget.RecyclerView; 4 | import android.util.Log; 5 | import android.view.View; 6 | import android.view.ViewGroup; 7 | 8 | public class LooperLayoutManager extends RecyclerView.LayoutManager { 9 | private static final String TAG = "LooperLayoutManager"; 10 | private boolean looperEnable = true; 11 | 12 | public LooperLayoutManager() {} 13 | 14 | public void setLooperEnable(boolean looperEnable) { 15 | this.looperEnable = looperEnable; 16 | } 17 | 18 | @Override 19 | public RecyclerView.LayoutParams generateDefaultLayoutParams() { 20 | return new RecyclerView.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, 21 | ViewGroup.LayoutParams.WRAP_CONTENT); 22 | } 23 | 24 | @Override 25 | public boolean canScrollHorizontally() { 26 | return true; 27 | } 28 | 29 | @Override 30 | public boolean canScrollVertically() { 31 | return false; 32 | } 33 | 34 | @Override 35 | public void onLayoutChildren(RecyclerView.Recycler recycler, RecyclerView.State state) { 36 | if (getItemCount() <= 0) { 37 | return; 38 | } 39 | //preLayout主要支持动画，直接跳过 40 | if (state.isPreLayout()) { 41 | return; 42 | } 43 | //将视图分离放入scrap缓存中，以准备重新对view进行排版 44 | detachAndScrapAttachedViews(recycler); 45 | 46 | int autualWidth = 0; 47 | for (int i = 0; i < getItemCount(); i++) { 48 | //初始化，将在屏幕内的view填充 49 | View itemView = recycler.getViewForPosition(i); 50 | addView(itemView); 51 | //测量itemView的宽高 52 | measureChildWithMargins(itemView, 0, 0); 53 | int width = getDecoratedMeasuredWidth(itemView); 54 | int height = getDecoratedMeasuredHeight(itemView); 55 | //根据itemView的宽高进行布局 56 | layoutDecorated(itemView, autualWidth, 0, autualWidth + width, height); 57 | 58 | autualWidth += width; 59 | //如果当前布局过的itemView的宽度总和大于RecyclerView的宽，则不再进行布局 60 | if (autualWidth > getWidth()) { 61 | break; 62 | } 63 | } 64 | } 65 | 66 | @Override 67 | public int scrollHorizontallyBy(int dx, RecyclerView.Recycler recycler, RecyclerView.State state) { 68 | //1.左右滑动的时候，填充子view 69 | int travl = fill(dx, recycler, state); 70 | if (travl == 0) { 71 | return 0; 72 | } 73 | 74 | //2.滚动 75 | offsetChildrenHorizontal(travl * -1); 76 | 77 | //3.回收已经离开界面的 78 | recyclerHideView(dx, recycler, state); 79 | return travl; 80 | } 81 | 82 | /** 83 | * 左右滑动的时候，填充 84 | */ 85 | private int fill(int dx, RecyclerView.Recycler recycler, RecyclerView.State state) { 86 | if (dx > 0) { 87 | //标注1.向左滚动 88 | View lastView = getChildAt(getChildCount() - 1); 89 | if (lastView == null) { 90 | return 0; 91 | } 92 | int lastPos = getPosition(lastView); 93 | //标注2.可见的最后一个itemView完全滑进来了，需要补充新的 94 | if (lastView.getRight() < getWidth()) { 95 | View scrap = null; 96 | //标注3.判断可见的最后一个itemView的索引， 97 | // 如果是最后一个，则将下一个itemView设置为第一个，否则设置为当前索引的下一个 98 | if (lastPos == getItemCount() - 1) { 99 | if (looperEnable) { 100 | scrap = recycler.getViewForPosition(0); 101 | } else { 102 | dx = 0; 103 | } 104 | } else { 105 | scrap = recycler.getViewForPosition(lastPos + 1); 106 | } 107 | if (scrap == null) { 108 | return dx; 109 | } 110 | //标注4.将新的itemViewadd进来并对其测量和布局 111 | addView(scrap); 112 | measureChildWithMargins(scrap, 0, 0); 113 | int width = getDecoratedMeasuredWidth(scrap); 114 | int height = getDecoratedMeasuredHeight(scrap); 115 | layoutDecorated(scrap,lastView.getRight(), 0, 116 | lastView.getRight() + width, height); 117 | return dx; 118 | } 119 | } else { 120 | //向右滚动 121 | View firstView = getChildAt(0); 122 | if (firstView == null) { 123 | return 0; 124 | } 125 | int firstPos = getPosition(firstView); 126 | 127 | if (firstView.getLeft() >= 0) { 128 | View scrap = null; 129 | if (firstPos == 0) { 130 | if (looperEnable) { 131 | scrap = recycler.getViewForPosition(getItemCount() - 1); 132 | } else { 133 | dx = 0; 134 | } 135 | } else { 136 | scrap = recycler.getViewForPosition(firstPos - 1); 137 | } 138 | if (scrap == null) { 139 | return 0; 140 | } 141 | addView(scrap, 0); 142 | measureChildWithMargins(scrap,0,0); 143 | int width = getDecoratedMeasuredWidth(scrap); 144 | int height = getDecoratedMeasuredHeight(scrap); 145 | layoutDecorated(scrap, firstView.getLeft() - width, 0, 146 | firstView.getLeft(), height); 147 | } 148 | } 149 | return dx; 150 | } 151 | 152 | /** 153 | * 回收界面不可见的view 154 | */ 155 | private void recyclerHideView(int dx, RecyclerView.Recycler recycler, RecyclerView.State state) { 156 | for (int i = 0; i < getChildCount(); i++) { 157 | View view = getChildAt(i); 158 | if (view == null) { 159 | continue; 160 | } 161 | if (dx > 0) { 162 | //向左滚动，移除一个左边不在内容里的view 163 | if (view.getRight() < 0) { 164 | removeAndRecycleView(view, recycler); 165 | Log.d(TAG, "循环: 移除 一个view childCount=" + getChildCount()); 166 | } 167 | } else { 168 | //向右滚动，移除一个右边不在内容里的view 169 | if (view.getLeft() > getWidth()) { 170 | removeAndRecycleView(view, recycler); 171 | Log.d(TAG, "循环: 移除 一个view childCount=" + getChildCount()); 172 | } 173 | } 174 | } 175 | 176 | } 177 | } 178 | -------------------------------------------------------------------------------- /app/src/main/java/com/xiashengming/widget/looppagerecyclerview/MyAdapter.java: -------------------------------------------------------------------------------- 1 | package com.xiashengming.widget.looppagerecyclerview; 2 | 3 | import android.support.annotation.NonNull; 4 | import android.support.v7.widget.RecyclerView; 5 | import android.view.LayoutInflater; 6 | import android.view.View; 7 | import android.view.ViewGroup; 8 | import android.widget.Button; 9 | 10 | import com.xiashengming.widget.R; 11 | 12 | import java.util.ArrayList; 13 | 14 | public class MyAdapter extends RecyclerView.Adapter { 15 | ArrayList data = new ArrayList(); 16 | 17 | public MyAdapter() { 18 | initData(); 19 | } 20 | 21 | @Override 22 | public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 23 | View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_view,parent,false); 24 | return new MyViewHolder(view); 25 | } 26 | 27 | @Override 28 | public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, final int position) { 29 | ((MyViewHolder) holder).btn.setText(data.get(position)); 30 | } 31 | 32 | @Override 33 | public int getItemCount() { 34 | return data.size(); 35 | } 36 | 37 | public class MyViewHolder extends RecyclerView.ViewHolder{ 38 | Button btn; 39 | public MyViewHolder(View itemView) { 40 | super(itemView); 41 | btn = itemView.findViewById(R.id.btn); 42 | } 43 | } 44 | 45 | private void initData(){ 46 | String[] str = new String[]{"AAAAAAA","BBBBBBBBB","CCCCCCCCCC"}; 47 | for (int i = 0; i < 9; i++) { 48 | data.add(i, str[i % 3]); 49 | 50 | } 51 | } 52 | } 53 | -------------------------------------------------------------------------------- /app/src/main/res/drawable-v24/ic_launcher_foreground.xml: -------------------------------------------------------------------------------- 1 | 7 | 12 | 13 | 19 | 22 | 25 | 26 | 27 | 28 | 34 | 35 | -------------------------------------------------------------------------------- /app/src/main/res/drawable/ic_launcher_background.xml: -------------------------------------------------------------------------------- 1 | 2 | 7 | 10 | 15 | 20 | 25 | 30 | 35 | 40 | 45 | 50 | 55 | 60 | 65 | 70 | 75 | 80 | 85 | 90 | 95 | 100 | 105 | 110 | 115 | 120 | 125 | 130 | 135 | 140 | 145 | 150 | 155 | 160 | 165 | 170 | 171 | -------------------------------------------------------------------------------- /app/src/main/res/drawable/pic1.jpg: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Xiasm/LooperLayoutManager/7cbe2b091e91b50b06e562a9da212d498dd53950/app/src/main/res/drawable/pic1.jpg -------------------------------------------------------------------------------- /app/src/main/res/drawable/pic2.jpg: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Xiasm/LooperLayoutManager/7cbe2b091e91b50b06e562a9da212d498dd53950/app/src/main/res/drawable/pic2.jpg 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