/
ItemTouchListenerAdapter.java
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/
ItemTouchListenerAdapter.java
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/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* /
*/
package com.du.android.recyclerview;
import android.support.annotation.Nullable;
import android.support.v7.widget.RecyclerView;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
/**
* As RecyclerView does not have standard way to add click listeners to the items,
* this RecyclerView.OnItemTouchListener intercepts touch events and translates them to simple onItemClick and onItemLongClick callbacks.
*
* Simply add it as follows:
* <pre>
* {@code
* recyclerView.addOnItemTouchListener(new ItemTouchListenerAdapter(recyclerView, this));
*
* }
* </pre>
*/
public class ItemTouchListenerAdapter extends GestureDetector.SimpleOnGestureListener implements RecyclerView.OnItemTouchListener {
public interface RecyclerViewOnItemClickListener {
void onItemClick(RecyclerView parent, View clickedView, int position);
void onItemLongClick(RecyclerView parent, View clickedView, int position);
}
private RecyclerViewOnItemClickListener listener;
private RecyclerView recyclerView;
private GestureDetector gestureDetector;
public ItemTouchListenerAdapter(RecyclerView recyclerView, RecyclerViewOnItemClickListener listener) {
if (recyclerView == null || listener == null) {
throw new IllegalArgumentException("RecyclerView and Listener arguments can not be null");
}
this.recyclerView = recyclerView;
this.listener = listener;
this.gestureDetector = new GestureDetector(recyclerView.getContext(), this);
}
@Override
public boolean onInterceptTouchEvent(RecyclerView recyclerView, MotionEvent motionEvent) {
gestureDetector.onTouchEvent(motionEvent);
return false;
}
@Override
public void onTouchEvent(RecyclerView recyclerView, MotionEvent motionEvent) {
}
@Override
public void onShowPress(MotionEvent e) {
View view = getChildViewUnder(e);
if (view != null) {
view.setPressed(true);
}
}
@Override
public boolean onSingleTapUp(MotionEvent e) {
View view = getChildViewUnder(e);
if (view == null) return false;
view.setPressed(false);
int position = recyclerView.getChildPosition(view);
listener.onItemClick(recyclerView, view, position);
return true;
}
public void onLongPress(MotionEvent e) {
View view = getChildViewUnder(e);
if (view == null) return;
int position = recyclerView.getChildPosition(view);
listener.onItemLongClick(recyclerView, view, position);
view.setPressed(false);
}
@Nullable
private View getChildViewUnder(MotionEvent e) {
return recyclerView.findChildViewUnder(e.getX(), e.getY());
}
}