我将 arecyclerView
与 a 结合使用,coordinator layout
并且遇到了一个小问题。当您向下滚动列表并且第一项即将通过状态栏时,它总是会出现障碍或停止大约一毫秒,然后再继续。这是非常微妙但引人注目的。这是一个 gif,请注意我的光标。当第一项即将通过状态栏时,我的光标会移动,但列表不会。这很烦人!它发生在手机和模拟器上。
请看 gif 以获得澄清:http: //i.imgur.com/80A5YNL.gifv
我注意到的是,你刷得越快,你注意到的障碍就越少。此外,只有在第一次将手指从屏幕上移开,第一个项目完全可见,然后超级慢地向下滚动列表,直到第一个项目位于状态栏后面时,才会重现故障。
这是activity_main.xml
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context=".MainActivity">
<android.support.design.widget.AppBarLayout
android:id="@+id/appBar"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?actionBarSize"
app:layout_scrollFlags="scroll|enterAlways"/>
</android.support.design.widget.AppBarLayout>
<android.support.v7.widget.RecyclerView
android:id="@+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"/>
</android.support.design.widget.CoordinatorLayout>
MainActivity.java
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
RecyclerView mRecyclerView = (RecyclerView)findViewById(R.id.recycler_view);
mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
mRecyclerView.setAdapter(new MainAdapter());
}
}
回收站视图适配器
public class MainAdapter extends RecyclerView.Adapter<MainAdapter.MainViewHolder> {
private String[] FRUITS = new String[] { "Apple", "Avocado", "Banana",
"Blueberry", "Coconut", "Durian", "Guava", "Kiwi", "Jackfruit", "Mango",
"Olive", "Pear", "Sugar-apple", "Orange", "Strawberry", "Pineapple",
"Watermelon", "Grape", "PassionFruit", "DragonFruit", "Honey-dew",
"Cantaloupe", "Papaya"};
public MainAdapter (){
}
public class MainViewHolder extends RecyclerView.ViewHolder{
TextView mTextView;
public MainViewHolder(View itemView) {
super(itemView);
mTextView = (TextView) itemView.findViewById(R.id.text_view_list_item);
}
}
@Override
public MainViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
View v = inflater.inflate(R.layout.list_item, parent, false);
return new MainViewHolder(v);
}
@Override
public void onBindViewHolder(MainViewHolder holder, int position) {
holder.mTextView.setText(FRUITS[position]);
}
@Override
public int getItemCount() {
return FRUITS.length;
}
}
我的代码很简单,找不到任何可能导致这种情况的东西。