本例重写了listDivider
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar"> ... <item name="android:listDivider">@drawable/divider_bg</item> </style> <?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://www.easck.com/apk/res/android" android:shape="rectangle"> <solid android:color="#ff00ff"/> <size android:height="4dp"/> <size android:width="4dp"/> </shape>
7. ItemAnimator
动画效果比较复杂, 使用默认动画. 如要定制的话, 继承DefaultItemAnimator; 如设置null, 则不显示任何动画.
private void initItemAnimator(RecyclerView recyclerView) {
recyclerView.setItemAnimator(new DefaultItemAnimator()); // 默认动画
}
8. 最终Activity
public class MainActivity extends AppCompatActivity {
private MyAdapter mAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
// 初始化RecyclerView
initRecyclerView((RecyclerView) findViewById(R.id.test_recycler_view));
}
/**
* 初始化RecyclerView
*
* @param recyclerView 主控件
*/
private void initRecyclerView(RecyclerView recyclerView) {
recyclerView.setHasFixedSize(true); // 设置固定大小
initRecyclerLayoutManager(recyclerView); // 初始化LayoutManager
initRecyclerAdapter(recyclerView); // 初始化Adapter
initItemDecoration(recyclerView); // 初始化边界装饰
initItemAnimator(recyclerView); // 初始化动画效果
}
/**
* 初始化RecyclerView的LayoutManager
*
* @param recyclerView 主控件
*/
private void initRecyclerLayoutManager(RecyclerView recyclerView) {
// 错列网格布局
recyclerView.setLayoutManager(new StaggeredGridLayoutManager(4,
StaggeredGridLayoutManager.VERTICAL));
}
/**
* 初始化RecyclerView的Adapter
*
* @param recyclerView 主控件
*/
private void initRecyclerAdapter(RecyclerView recyclerView) {
mAdapter = new MyAdapter(getData());
recyclerView.setAdapter(mAdapter);
}
/**
* 初始化RecyclerView的(ItemDecoration)项目装饰
*
* @param recyclerView 主控件
*/
private void initItemDecoration(RecyclerView recyclerView) {
recyclerView.addItemDecoration(new MyItemDecoration(this));
}
/**
* 初始化RecyclerView的(ItemAnimator)项目动画
*
* @param recyclerView 主控件
*/
private void initItemAnimator(RecyclerView recyclerView) {
recyclerView.setItemAnimator(new DefaultItemAnimator()); // 默认动画
}
/**
* 模拟的数据
*
* @return 数据
*/
private ArrayList<DataModel> getData() {
int count = 57;
ArrayList<DataModel> data = new ArrayList<>();
for (int i = 0; i < count; i++) {
DataModel model = new DataModel();
model.setDateTime(getBeforeDay(new Date(), i));
model.setLabel("No. " + i);
data.add(model);
}
return data;
}
/**
* 获取日期的前一天
*
* @param date 日期
* @param i 偏离
* @return 新的日期
*/
private static Date getBeforeDay(Date date, int i) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.add(Calendar.DAY_OF_YEAR, i * (-1));
return calendar.getTime();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
switch (item.getItemId()) {
case R.id.id_action_add:
mAdapter.addData(1);
break;
case R.id.id_action_delete:
mAdapter.removeData(1);
break;
}
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
