| /* |
| * Copyright (C) 2013 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.server.am; |
| |
| import android.content.Context; |
| import android.os.Handler; |
| import android.os.Message; |
| import android.os.SystemClock; |
| import android.util.Slog; |
| import android.view.WindowManager; |
| import android.widget.Toast; |
| |
| import com.android.internal.R; |
| |
| /** |
| * Helper to manage showing/hiding a image to notify them that they are entering |
| * or exiting screen pinning mode. |
| */ |
| public class LockTaskNotify { |
| private static final String TAG = "LockTaskNotify"; |
| private static final long SHOW_TOAST_MINIMUM_INTERVAL = 1000; |
| |
| private final Context mContext; |
| private final H mHandler; |
| private Toast mLastToast; |
| private long mLastShowToastTime; |
| |
| public LockTaskNotify(Context context) { |
| mContext = context; |
| mHandler = new H(); |
| } |
| |
| /** Show "Screen pinned" toast. */ |
| void showPinningStartToast() { |
| makeAllUserToastAndShow(R.string.lock_to_app_start); |
| } |
| |
| /** Show "Screen unpinned" toast. */ |
| void showPinningExitToast() { |
| makeAllUserToastAndShow(R.string.lock_to_app_exit); |
| } |
| |
| /** Show a toast that describes the gesture the user should use to escape pinned mode. */ |
| void showEscapeToast() { |
| mHandler.obtainMessage(H.SHOW_ESCAPE_TOAST).sendToTarget(); |
| } |
| |
| private void handleShowEscapeToast() { |
| long showToastTime = SystemClock.elapsedRealtime(); |
| if ((showToastTime - mLastShowToastTime) < SHOW_TOAST_MINIMUM_INTERVAL) { |
| Slog.i(TAG, "Ignore toast since it is requested in very short interval."); |
| return; |
| } |
| if (mLastToast != null) { |
| mLastToast.cancel(); |
| } |
| mLastToast = makeAllUserToastAndShow(R.string.lock_to_app_toast); |
| mLastShowToastTime = showToastTime; |
| } |
| |
| private Toast makeAllUserToastAndShow(int resId) { |
| Toast toast = Toast.makeText(mContext, resId, Toast.LENGTH_LONG); |
| toast.getWindowParams().privateFlags |= |
| WindowManager.LayoutParams.PRIVATE_FLAG_SHOW_FOR_ALL_USERS; |
| toast.show(); |
| return toast; |
| } |
| |
| private final class H extends Handler { |
| private static final int SHOW_ESCAPE_TOAST = 3; |
| |
| @Override |
| public void handleMessage(Message msg) { |
| switch(msg.what) { |
| case SHOW_ESCAPE_TOAST: |
| handleShowEscapeToast(); |
| break; |
| } |
| } |
| } |
| } |