我试图覆盖onoverscrolled(),但它没有被触发:
public class MyRecyclerView extends RecyclerView {
public MyRecyclerView(@NonNull Context context) {
super(context);
}
public MyRecyclerView(@NonNull Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
}
public MyRecyclerView(@NonNull Context context, @Nullable AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
protected void onOverScrolled(int scrollX, int scrollY, boolean clampedX, boolean clampedY) {
super.onOverScrolled(scrollX, scrollY, clampedX, clampedY);
Toast.makeText(getContext(), "overScrolled", Toast.LENGTH_SHORT).show();
}
}
我的回收服务已
recyclerView.setOverScrollMode(View.OVER_SCROLL_ALWAYS);
最佳答案
尝试查找bottom overscroll
和top overscroll
使用LayoutManager查找bottom overscroll
和top overscroll
。
import android.os.Bundle;
import java.util.ArrayList;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
public class MainActivity extends AppCompatActivity {
RecyclerView myRecyclerView;
ArrayList<String> arrayList = new ArrayList<>();
DataAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myRecyclerView = findViewById(R.id.myRecyclerView);
LinearLayoutManager linearLayoutManager= new LinearLayoutManager(this){
@Override
public int scrollVerticallyBy ( int dx, RecyclerView.Recycler recycler, RecyclerView.State state ) {
int scrollRange = super.scrollVerticallyBy(dx, recycler, state);
int overScroll = dx - scrollRange;
if (overScroll > 0) {
Utils.printLog("NILU_PILU :-> BOTTOM OVERSCROLL");
} else if (overScroll < 0) {
Utils.printLog("NILU_PILU :-> TOP OVERSCROLL");
}
return scrollRange;
}
};
myRecyclerView.setLayoutManager(linearLayoutManager);
myRecyclerView.setHasFixedSize(true);
addDataToList();
adapter = new DataAdapter(this, arrayList);
myRecyclerView.setAdapter(adapter);
}
private void addDataToList() {
for (int i = 0; i < 50; i++) {
arrayList.add("NILU_PILU :-> " + i);
}
}
}
使用
bottom overscroll
查找RecyclerView.addOnScrollListener()
myRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
if (dy > 0) {
int pos = linearLayoutManager.findLastVisibleItemPosition();
int numItems = myRecyclerView.getAdapter().getItemCount();
if (pos >= numItems - 1 ) {
Utils.printLog("NILU_PILU :-> BOTTOM OVERSCROLL");
}
}
}
});