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      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