DrawerLayout friendly ViewPager that will ignore rogue touch events from the bezel swipe gesture.

DrawerSafeViewPager.java

/*
 * 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);
	}
	
}