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

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);