<!-- extend one of the Theme.AppCompat themes --><style name="Theme.MyTheme" parent="Theme.AppCompat.Light">  <!-- customize the color palette -->  <item name="colorPrimary">@color/material_blue_500</item>  <item name="colorPrimaryDark">@color/material_blue_700</item>  <item name="colorAccent">@color/material_green_A200</item></style>

dependencies {  compile 'com.android.support:appcompat-v7:21.0.+'  compile 'com.android.support:cardview-v7:21.0.+'  compile 'com.android.support:recyclerview-v7:21.0.+'}

// Check if we're running on Android 5.0 or higherif (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {  // Call some material design APIs here} else {  // Implement this feature without material design}

import android.app.Activity; import android.os.Bundle; import android.support.v7.widget.GridLayoutManager; import android.support.v7.widget.RecyclerView; import android.support.v7.widget.RecyclerView.LayoutParams; import android.view.LayoutInflater; import android.view.ViewGroup; import android.widget.TextView;  public class RecyclerViewActivity extends Activity {   /*    * recyclerview提供這些內置的布局管理器：    * linearlayoutmanager       顯示垂直滾動列表或水平的項目。    * gridlayoutmanager        顯示在一個網格項目。    * staggeredgridlayoutmanager    顯示在交錯網格項目。    * 自定義的布局管理器，需要繼承recyclerview.layoutmanager類。    *    * add/remove items時的動畫是默認啟用的。    * 自定義這些動畫需要繼承RecyclerView.ItemAnimator，并實現RecyclerView.setItemAnimator()    */    private RecyclerView mRecyclerView;    private RecyclerView.Adapter mAdapter;    private RecyclerView.LayoutManager mLayoutManager;    private String[] myDataset;    @Override   protected void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);          setContentView(R.layout.recycler_view);     mRecyclerView = (RecyclerView) findViewById(R.id.my_recycler_view);      // use this setting to improve performance if you know that changes     // in content do not change the layout size of the RecyclerView     mRecyclerView.setHasFixedSize(true);      // use a linear layout manager //    mLayoutManager = new LinearLayoutManager(this);      //    mLayoutManager = new GridLayoutManager(this, 3, GridLayoutManager.VERTICAL, true);     //true 表示，將layout內容反轉     mLayoutManager = new GridLayoutManager(this, 3, GridLayoutManager.VERTICAL, false);     //HORIZONTAL 橫向滾動顯示內容  VERTICAL縱向 //    mLayoutManager = new GridLayoutManager(this, 3, GridLayoutManager.HORIZONTAL, false);          //方向也是指示滾動方向，例子中橫向開頭的數據交錯了一點， 縱向的無交錯 //    mLayoutManager = new StaggeredGridLayoutManager(3, StaggeredGridLayoutManager.HORIZONTAL); //    mLayoutManager = new StaggeredGridLayoutManager(4, StaggeredGridLayoutManager.VERTICAL);          mRecyclerView.setLayoutManager(mLayoutManager); //    mRecyclerView.setLayoutManager(new MyLayoutMnager()); //數據不顯示，可能還需要重寫什么東西。。      // specify an adapter (see also next example)         setDatas();     mAdapter = new MyAdapter(myDataset);     mRecyclerView.setAdapter(mAdapter);   }      private void setDatas() {     int len = 200;     myDataset = new String[len];     for (int i = 0; i < len; i++) {       switch (i%3) {       case 0:         myDataset[i] = "中國" + i;         break;       case 1:         myDataset[i] = "美國" + i;         break;       case 2:         myDataset[i] = "澳大利亞" + i;         break;       }     }   }      class MyLayoutMnager extends RecyclerView.LayoutManager {      @Override     public LayoutParams generateDefaultLayoutParams() {       LayoutParams params = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);       params.topMargin = 5;       return params;     }   }      class MyAdapter extends RecyclerView.Adapter<ViewHolder> {     private String[] mDataset;      // Provide a reference to the views for each data item     // Complex data items may need more than one view per item, and     // you provide access to all the views for a data item in a view holder      // Provide a suitable constructor (depends on the kind of dataset)     public MyAdapter(String[] myDataset) {       mDataset = myDataset;     }      // Create new views (invoked by the layout manager)     @Override     public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {       // create a new view       TextView tv = (TextView) LayoutInflater.from(parent.getContext())           .inflate(R.layout.my_text_view, parent, false);       // set the view's size, margins, paddings and layout parameters       //...       ViewHolder vh = new ViewHolder(tv); //構建一個ViewHolder       return vh;     }      // Replace the contents of a view (invoked by the layout manager)     @Override     public void onBindViewHolder(ViewHolder holder, int position) {       // - get element from your dataset at this position       // - replace the contents of the view with that element       holder.mTextView.setText(mDataset[position]);      }      // Return the size of your dataset (invoked by the layout manager)     @Override     public int getItemCount() {       return mDataset.length;     }   }      static class ViewHolder extends RecyclerView.ViewHolder {     // each data item is just a string in this case     public TextView mTextView;     public ViewHolder(TextView v) {       super(v);       mTextView = v;     }   } }