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); 
  } 
  ... 
} 

adapter

public 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.+' 
}