Android Material设计中列表和卡片的创建方法解析

<!-- A RecyclerView with some commonly used attributes --> <android.support.v7.widget.RecyclerView   android:id="@+id/my_recycler_view"   android:scrollbars="vertical"   android:layout_width="match_parent"   android:layout_height="match_parent"/> 

public class MyActivity extends Activity {   private RecyclerView mRecyclerView;   private RecyclerView.Adapter mAdapter;   private RecyclerView.LayoutManager mLayoutManager;    @Override   protected void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.my_activity);     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); //使用固定size 以优化性能      // use a linear layout manager     mLayoutManager = new LinearLayoutManager(this);     mRecyclerView.setLayoutManager(mLayoutManager);      // specify an adapter (see also next example)     mAdapter = new MyAdapter(myDataset);     mRecyclerView.setAdapter(mAdapter);   }   ... } adapterpublic class MyAdapter extends RecyclerView.Adapter<MyAdapter.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   public 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;     }   }    // 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 MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent,                           int viewType) {     // create a new view     TextView v = (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(v);     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;   } } 

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"   xmlns:tools="http://schemas.android.com/tools"   xmlns:card_view="http://schemas.android.com/apk/res-auto"   ... >   <!-- A CardView that contains a TextView -->   <android.support.v7.widget.CardView     xmlns:card_view="http://schemas.android.com/apk/res-auto"     android:id="@+id/card_view"     android:layout_gravity="center"     android:layout_width="200dp"     android:layout_height="200dp"     card_view:cardCornerRadius="4dp">      <TextView       android:id="@+id/info_text"       android:layout_width="match_parent"       android:layout_height="match_parent" />   </android.support.v7.widget.CardView> </LinearLayout> 

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