popu bin view設置 and col cas mda rac data

個人認為 RecyclerView組件確實值得學習並用到我們的項目中去，前面學了相關的內容。今天再補充一些相關的東東。

1，實現對RecyclerView中的數據進行加入和刪除操作。還是一樣直接上代碼：

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://加入操作
if (mAdapter != null) {
mAdapter.add(1);// 我們加入在第2個位置，相應position=1
}
break;
case R.id.action_del://刪除操作
if (mAdapter != null) {
mAdapter.delete(1);// 我們刪除第2個位置。相應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;
}

/**加入數據*/
public void add(int pos) {
TestData data = new TestData();
data.setContent("這是添加");
data.setTitle("加入");
mDatas.add(pos, data);
notifyItemInserted(pos);// 一定是調用 notifyItemInserted而不是調用 notifyDataSetChanged()
}

/**刪除數據*/
public void delete(int pos) {
mDatas.remove(pos);
notifyItemRemoved(pos);// 一定是調用notifyItemRemoved而不是調用 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。給RecyclerView中的Item加入分隔線：

實現addItemDecoration(RecyclerView.ItemDecoration itemDecoration)方法。我們須要寫個類去繼承ItemDecoration，現實現分隔功能。然後僅僅須要一句代碼：

mRecyclerView.addItemDecoration(new DividerItemDecoration(this,DividerItemDecoration.VERTICAL_LIST));//DividerItemDecoration在網上能夠找到哦，還有非常多相關動畫實現的，能夠參考：https://github.com/yqritc/RecyclerView-FlexibleDivider

3。部分小總結：

a,在給RecyclerView設置LinearLayoutManager時，

LinearLayoutManager ll = new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false);//第三個參數假設寫成true。則我們item的pos順序與展示的是反向的
mRecyclerView.setLayoutManager(ll);

b,我們相同能夠給RecyclerView實現絢麗的分隔線，比方：https://github.com/yqritc/RecyclerView-FlexibleDivider

Android學習筆記：超能RecyclerView組件使用總結