1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.packageinstaller.permission.ui; 18 19 import android.content.Context; 20 import android.util.AttributeSet; 21 import android.view.MotionEvent; 22 import android.widget.Button; 23 24 /** 25 * Extension of Button that uses the hidden MotionEvent flag for partially obscured windows to 26 * prevent tapjacking attacks. 27 */ 28 public class SecureButtonView extends Button { 29 30 public SecureButtonView(Context context) { 31 this(context, null); 32 } 33 34 public SecureButtonView(Context context, AttributeSet attrs) { 35 this(context, attrs, 0); 36 } 37 38 public SecureButtonView(Context context, AttributeSet attrs, int defStyleAttr) { 39 this(context, attrs, defStyleAttr, 0); 40 } 41 42 public SecureButtonView(Context context, AttributeSet attrs, int defStyleAttr, 43 int defStyleRes) { 44 super(context, attrs, defStyleAttr, defStyleRes); 45 } 46 47 @Override 48 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 49 if ((event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0 50 || (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_PARTIALLY_OBSCURED) != 0) { 51 // Window is obscured, drop this touch. 52 return false; 53 } 54 return true; 55 } 56 } 57