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DrawerLayout friendly ViewPager that will ignore rogue touch events from the bezel swipe gesture.
/*
* Copyright (C) 2013 readyState Software Ltd
*
* 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.example;
import android.content.Context;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.MotionEvent;
public class DrawerSafeViewPager extends ViewPager {
private static final int DEFAULT_GUTTER_SIZE = 16; // dips
private int mDefaultGutterSize;
private int mGutterSize;
public DrawerSafeViewPager(Context context) {
super(context);
init();
}
public DrawerSafeViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
void init() {
final float density = getContext().getResources().getDisplayMetrics().density;
mDefaultGutterSize = (int) (DEFAULT_GUTTER_SIZE * density);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
final int measuredWidth = getMeasuredWidth();
final int maxGutterSize = measuredWidth / 10;
mGutterSize = Math.min(maxGutterSize, mDefaultGutterSize);
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
// Don't handle events within the left gutter. This fixes an issue with
// ViewPager briefly intercepting the bezel swipe gesture within a DrawerLayout
// and starting a drag movement, causing a visual stutter.
if (ev.getAction() != MotionEvent.ACTION_UP && ev.getX() < mGutterSize) {
return false;
}
return super.onTouchEvent(ev);
}
}
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