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/*
* Copyright (C) 2016 The Android Open Source Project
*
* 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.android.packageinstaller.permission.ui;
import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.Button;
/**
* Extension of Button that uses the hidden MotionEvent flag for partially obscured windows to
* prevent tapjacking attacks.
*/
public class SecureButtonView extends Button {
public SecureButtonView(Context context) {
this(context, null);
}
public SecureButtonView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public SecureButtonView(Context context, AttributeSet attrs, int defStyleAttr) {
this(context, attrs, defStyleAttr, 0);
}
public SecureButtonView(Context context, AttributeSet attrs, int defStyleAttr,
int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}
@Override
public boolean onFilterTouchEventForSecurity(MotionEvent event) {
if ((event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0
|| (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_PARTIALLY_OBSCURED) != 0) {
// Window is obscured, drop this touch.
return false;
}
return true;
}
}
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