Android RecyclerView详解之实现 ListView GridView瀑布流效果

dependencies { 
compile fileTree(dir: 'libs', include: ['*.jar']) 
compile 'com.android.support:appcompat-v7:21.0.3' 
compile 'com.android.support:recyclerview-v7:21.0.3' 
... 
} 

//继承自 RecyclerView.Adapter 
class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> { 
//RecyclerView显示的子View 
//该方法返回是ViewHolder，当有可复用View时，就不再调用 
@Override 
public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) { 
View v = getLayoutInflater().inflate(R.layout.recycler_item, null); 
return new ViewHolder(v); 
} 
//将数据绑定到子View，会自动复用View 
@Override 
public void onBindViewHolder(ViewHolder viewHolder, int i) { 
viewHolder.textView.setText(data[i]); 
} 
//RecyclerView显示数据条数 
@Override 
public int getItemCount() { 
return data.length; 
} 
//自定义的ViewHolder,减少findViewById调用次数 
class ViewHolder extends RecyclerView.ViewHolder { 
TextView textView; 
ImageView imageView; 
//在布局中找到所含有的UI组件 
public ViewHolder(View itemView) { 
super(itemView); 
textView = (TextView) itemView.findViewById(R.id.textView); 
imageView = (ImageView) itemView.findViewById(R.id.imageView); 
} 
} 
} 

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="match_parent" 
android:layout_height="match_parent"> 
<ImageView 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:id="@+id/imageView" 
android:src="@drawable/ic_launcher" /> 
<TextView 
android:layout_width="wrap_content" 
android:layout_height="match_parent" 
android:text="Medium Text" 
android:layout_marginLeft="5dp" 
android:gravity="center_vertical" 
android:id="@+id/textView" /> 
</LinearLayout> 

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
tools:context=".MainActivity"> 
<android.support.v7.widget.RecyclerView 
android:id="@+id/recyclerView" 
android:layout_width="match_parent" 
android:layout_height="match_parent" /> 
</RelativeLayout> 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.activity_main); 
//找到 RecyclerView 
RecyclerView recylcer = (RecyclerView) findViewById(R.id.recyclerView); 
//ListView效果的 LinearLayoutManager 
LinearLayoutManager mgr = new LinearLayoutManager(this); 
//VERTICAL纵向，类似ListView，HORIZONTAL<span style="font-family: Arial, Helvetica, sans-serif;">横向，类似Gallery</span> 
mgr.setOrientation(LinearLayoutManager.VERTICAL); 
recylcer.setLayoutManager(mgr); 
//设置适配器 
recylcer.setAdapter(new MyAdapter()); 
} 

//GridLayout 3列 
GridLayoutManager mgr=new GridLayoutManager(this,3); 
recylcer.setLayoutManager(mgr); 

//3列 方向垂直 
StaggeredGridLayoutManager mgr = new StaggeredGridLayoutManager(3, StaggeredGridLayoutManager.VERTICAL); 
recylcer.setLayoutManager(mgr); 

//将数据绑定到子View 
@Override 
public void onBindViewHolder(ViewHolder viewHolder, int i) { 
viewHolder.textView.setText(data[i]); 
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams( 
LinearLayout.LayoutParams.MATCH_PARENT, 
<span style="white-space:pre"> </span>100+(int) (Math.random() * 50)); 
viewHolder.imageView.setLayoutParams(lp); 
}