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[英]How Lists (specifically, RecyclerView with CardViews) in Android work
[英]How to work with RecyclerView in Android?
我已经在main_activity.xml
使用以下代码来添加Floating Button
:
<android.support.design.widget.FloatingActionButton
android:id="@+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|right"
android:layout_margin="16dp"
android:clickable="true"
android:src="@drawable/ic_refresh" />
我正在使用以下方法在RecyclerView
加载数据:
public void getWarehouse(){
.....
//Some retrofit calls
.....
mRecyclerView = (RecyclerView) mActivity.findViewById(R.id.staggering_grid);
mRecyclerView.setLayoutManager(new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL));
mAdapter = new StaggeredGridAdapter(mContext);
mAdapter.addItems(response);
mRecyclerView.setAdapter(mAdapter);
GridItemSpaces decoration = new GridItemSpaces(10);
mRecyclerView.addItemDecoration(decoration);
}
getWareHouse()
方法的目的:在RecyclerView Staggered Grid View
加载数据。
FloatingButton
目的:刷新API calls
的数据。 简而言之,我从FloatingActionButton
OnClickListner
调用getWareHouse()
:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
setContentView(R.layout.activity_main);
wareHousAPIWrapper = new WareHousAPIWrapper(getApplicationContext(), MainActivity.this);
mToolbar = (Toolbar) findViewById(R.id.tool_bar);
FloatingActionButton mFab = (FloatingActionButton) findViewById(R.id.fab);
mFab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
wareHousAPIWrapper.getWarehouse();
}
});
if (mToolbar != null) {
setSupportActionBar(mToolbar);
getSupportActionBar().setTitle("sample");
}
wareHousAPIWrapper.getWarehouse();
}
单击FloatingButton
时,我可以在RecyclerView
看到加载的数据,但是每次单击Staggered
的刷新长度都会增加。
为什么会这样呢?
看截图:
getWarehouse
方法定义 //Making request to API
adapter.create(WarehouseAPI.class).getWarehouse()
.subscribeOn(Schedulers.newThread())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Observer<List<Warehouse>>() {
@Override
public void onCompleted() {
Log.d(this.getClass().getName(), "OnCompleted ()");
}
@Override
public void onError(Throwable e) {
Log.d(this.getClass().getName(), "Error:" + e.toString());
}
@Override
public void onNext(List<Warehouse> response) {
// code for `RecyclerView` I have posted above
}
});
随着每次调用wareHouseAPIWrapper.getWarehouse()
您要添加另一个项目的装饰器mRecyclerView
。 这导致每次单击刷新按钮时, RecyclerView
的项目变小。 您仅应在初始化活动时添加项目装饰器,如下所示:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
setContentView(R.layout.activity_main);
wareHousAPIWrapper = new WareHousAPIWrapper(getApplicationContext(), MainActivity.this);
mToolbar = (Toolbar) findViewById(R.id.tool_bar);
FloatingActionButton mFab = (FloatingActionButton) findViewById(R.id.fab);
mFab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
wareHousAPIWrapper.getWarehouse();
}
});
if (mToolbar != null) {
setSupportActionBar(mToolbar);
getSupportActionBar().setTitle("sample");
}
wareHousAPIWrapper.getWarehouse();
RecyclerView mRecyclerView = (RecyclerView) findViewById(R.id.staggering_grid);
GridItemSpaces decoration = new GridItemSpaces(10);
mRecyclerView.addItemDecoration(decoration);
}
不再需要在getWarehouse()
添加项目装饰器:
public void getWarehouse(){
.....
//Some retrofit calls
.....
mRecyclerView = (RecyclerView) mActivity.findViewById(R.id.staggering_grid);
mRecyclerView.setLayoutManager(new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL));
mAdapter = new StaggeredGridAdapter(mContext);
mAdapter.addItems(response);
mRecyclerView.setAdapter(mAdapter);
}
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