Android学习笔记：超能RecyclerView组件使用总结

个人觉得 RecyclerView组件确实值得学习并用到我们的项目中去，前面学了相关的内容，今天再补充一些相关的东东。

1，实现对RecyclerView中的数据进行添加和删除操作，还是一样直接上代码：

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);

LinearLayoutManager ll = new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false);

mRecyclerView.setLayoutManager(ll);

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

getMenuInflater().inflate(R.menu.main, menu);

return true;

}

@Override

public boolean onOptionsItemSelected(MenuItem item) {

int id = item.getItemId();

switch (id) {

case R.id.action_add://添加操作

if (mAdapter != null) {

mAdapter.add(1);// 我们添加在第2个位置，对应position=1

}

break;

case R.id.action_del://删除操作

if (mAdapter != null) {

mAdapter.delete(1);// 我们删除第2个位置，对应position=1

}

break;

}

return super.onOptionsItemSelected(item);

}

}

------------Adapter----------------------------------

public class TestAdapter extends Adapter<TestViewHolder> {

private Context mContext;

private List<TestData> mDatas;

public TestAdapter(Context mContext, List<TestData> mDatas) {

this.mContext = mContext;

this.mDatas = mDatas;

}

/**添加数据*/

public void add(int pos) {

TestData data = new TestData();

data.setContent("这是增加");

data.setTitle("添加");

mDatas.add(pos, data);

notifyItemInserted(pos);// 一定是调用 notifyItemInserted而不是调用 notifyDataSetChanged()

}

/**删除数据*/

public void delete(int pos) {

mDatas.remove(pos);

notifyItemRemoved(pos);// 一定是调用notifyItemRemoved而不是调用 notifyDataSetChanged()

}

@Override

public TestViewHolder onCreateViewHolder(ViewGroup paramViewGroup, int paramInt) {

View v = LayoutInflater.from(mContext).inflate(R.layout.lv_item, null);

TestViewHolder holder = new TestViewHolder(v);

return holder;

}

@Override

public void onBindViewHolder(final TestViewHolder paramVH, final int paramInt) {

paramVH.titleTv.setText(mDatas.get(paramInt).getTitle());

paramVH.contentTv.setText(mDatas.get(paramInt).getContent());

}

@Override

public int getItemCount() {

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);

}

}

2，给RecyclerView中的Item添加分隔线：

实现addItemDecoration(RecyclerView.ItemDecoration itemDecoration)方法，我们需要写个类去继承ItemDecoration，现实现分隔功能。然后只需要一句代码：

mRecyclerView.addItemDecoration(new DividerItemDecoration(this,DividerItemDecoration.VERTICAL_LIST));//DividerItemDecoration在网上可以找到哦，还有很多相关动画实现的，可以参考：https://github.com/yqritc/RecyclerView-FlexibleDivider

3，部分小总结：

a,在给RecyclerView设置LinearLayoutManager时，

LinearLayoutManager ll = new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false);//第三个参数如果写成true，则我们item的pos顺序与展示的是反向的

mRecyclerView.setLayoutManager(ll);

b,我们同样可以给RecyclerView实现绚丽的分隔线，比如：https://github.com/yqritc/RecyclerView-FlexibleDivider