Android学习笔记：超能RecyclerView组件使用（中）---秒变

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       RecyclerView最强大的功能在于秒变功能，只需要改动很少的代码就可以实现ListView，GridView及水平ListViw的切换功能

public class MainActivity extends ActionBarActivity {
private RecyclerView mRecyclerView;
private List<TestData> mDatas;
private TestAdapter mAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initDatas();
initViews();
}
 
private void initDatas() {
mDatas=new ArrayList<TestData>();
TestData data=new TestData();
for (int i = 'A'; i < 'z'; i++) {
data.setTitle("Title"+(char)i);
data.setContent("Content"+(char)i);
mDatas.add(data);
}
}


private void initViews() {
mRecyclerView=(RecyclerView) findViewById(R.id.test_rcv);
mAdapter=new TestAdapter(this, mDatas);
mRecyclerView.setAdapter(mAdapter);

                 /************水平ListView效果****************************************/
LinearLayoutManager ll=new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, true);
       mRecyclerView.setLayoutManager(ll);

               /************垂直ListView效果****************************************/
LinearLayoutManager ll=new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, true);//实现ListView效果
mRecyclerView.setLayoutManager(ll);

                /************水平滚动的GridView效果****************************************/

               StaggeredGridLayoutManager  ll=new StaggeredGridLayoutManager(5, StaggeredGridLayoutManager.HORIZONTAL);//水平GridView效果，5列展示
mRecyclerView.setLayoutManager(ll);

              /************GridView效果****************************************/
GridLayoutManager ll=new GridLayoutManager(this, 4);//4列展示
mRecyclerView.setLayoutManager(ll);
}
}

下面就是实现瀑布流操作，主要改的就是我们的适配器，要在适配器中动态计算item的高度

public class WaterFlowAdapter extends Adapter<WaterFlowAdapter.TestViewHolder> {
private Context mContext;
private List<TestData> mDatas;
private List<Integer> heightArray;


public WaterFlowAdapter(Context mContext, List<TestData> mDatas) {
this.mContext = mContext;
this.mDatas = mDatas;
heightArray=new ArrayList<Integer>();
for (int i = 0; i < mDatas.size(); i++) {
heightArray.add((int)(100+Math.random()*300));
}
}

@Override
public WaterFlowAdapter.TestViewHolder onCreateViewHolder(ViewGroup paramViewGroup, int paramInt) {
View v = LayoutInflater.from(mContext).inflate(R.layout.lv_item, null);
TestViewHolder holder = new WaterFlowAdapter.TestViewHolder(v);
return holder;
}

@Override
public void onBindViewHolder(WaterFlowAdapter.TestViewHolder paramVH, int paramInt) {
LayoutParams lp=paramVH.itemView.getLayoutParams();
lp.height=heightArray.get(paramInt);
paramVH.itemView.setLayoutParams(lp);
paramVH.titleTv.setText(mDatas.get(paramInt).getTitle());
paramVH.contentTv.setText(mDatas.get(paramInt).getContent());
}

@Override
public int getItemCount() {
// TODO Auto-generated method stub
return mDatas.size();
}


class TestViewHolder extends ViewHolder {
ImageView iconIv;
TextView titleTv;
TextView contentTv;

public TestViewHolder(View holder) {
super(holder);
iconIv = (ImageView) holder.findViewById(R.id.item_iv);
titleTv = (TextView) holder.findViewById(R.id.item_title);
contentTv = (TextView) holder.findViewById(R.id.item_content);
}

}
}

最后在Activity中：

mAdapter=new WaterFlowAdapter(this, mDatas);
mRecyclerView.setAdapter(mAdapter);

StaggeredGridLayoutManager  ll=new StaggeredGridLayoutManager(4, StaggeredGridLayoutManager.VERTICAL);//水平GridView效果，5列展示
mRecyclerView.setLayoutManager(ll);

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