| /* |
| * Copyright (C) 2017 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.settingslib; |
| |
| import android.os.SystemClock; |
| import android.view.MotionEvent; |
| import android.view.View; |
| import android.widget.Toast; |
| |
| /** |
| * A touch listener which consumes touches when another window is partly or wholly obscuring the |
| * window containing the view this listener is attached to. |
| * Optionally accepts a string to show the user as a toast when consuming an insecure touch |
| */ |
| public class SecureTouchListener implements View.OnTouchListener { |
| |
| private static final long TAP_DEBOUNCE_TIME = 2000; |
| private long mLastToastTime = 0; |
| private String mWarningText; |
| |
| public SecureTouchListener() { |
| this(null); |
| } |
| |
| public SecureTouchListener(String warningText) { |
| mWarningText = warningText; |
| } |
| |
| @Override |
| public boolean onTouch(View v, MotionEvent event) { |
| if ((event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0 |
| || (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_PARTIALLY_OBSCURED) != 0) { |
| if (mWarningText != null) { |
| // Show a toast warning the user |
| final long currentTime = SystemClock.uptimeMillis(); |
| if (currentTime - mLastToastTime > TAP_DEBOUNCE_TIME) { |
| mLastToastTime = currentTime; |
| Toast.makeText(v.getContext(), mWarningText, Toast.LENGTH_SHORT).show(); |
| } |
| } |
| // Consume the touch event |
| return true; |
| } |
| return false; |
| } |
| } |