1 /* 2 * Copyright (C) 2013 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.server.am; 18 19 import android.app.ActivityManager; 20 import android.content.Context; 21 import android.os.Handler; 22 import android.os.Message; 23 import android.view.WindowManager; 24 import android.view.accessibility.AccessibilityManager; 25 import android.widget.Toast; 26 27 import com.android.internal.R; 28 29 /** 30 * Helper to manage showing/hiding a image to notify them that they are entering 31 * or exiting lock-to-app mode. 32 */ 33 public class LockTaskNotify { 34 private static final String TAG = "LockTaskNotify"; 35 36 private final Context mContext; 37 private final H mHandler; 38 private AccessibilityManager mAccessibilityManager; 39 private Toast mLastToast; 40 41 public LockTaskNotify(Context context) { 42 mContext = context; 43 mAccessibilityManager = (AccessibilityManager) 44 mContext.getSystemService(Context.ACCESSIBILITY_SERVICE); 45 mHandler = new H(); 46 } 47 48 public void showToast(int lockTaskModeState) { 49 mHandler.obtainMessage(H.SHOW_TOAST, lockTaskModeState, 0 /* Not used */).sendToTarget(); 50 } 51 52 public void handleShowToast(int lockTaskModeState) { 53 String text = null; 54 if (lockTaskModeState == ActivityManager.LOCK_TASK_MODE_LOCKED) { 55 text = mContext.getString(R.string.lock_to_app_toast_locked); 56 } else if (lockTaskModeState == ActivityManager.LOCK_TASK_MODE_PINNED) { 57 text = mContext.getString(mAccessibilityManager.isEnabled() 58 ? R.string.lock_to_app_toast_accessible : R.string.lock_to_app_toast); 59 } 60 if (text == null) { 61 return; 62 } 63 if (mLastToast != null) { 64 mLastToast.cancel(); 65 } 66 mLastToast = makeAllUserToastAndShow(text); 67 } 68 69 public void show(boolean starting) { 70 int showString = R.string.lock_to_app_exit; 71 if (starting) { 72 showString = R.string.lock_to_app_start; 73 } 74 makeAllUserToastAndShow(mContext.getString(showString)); 75 } 76 77 private Toast makeAllUserToastAndShow(String text) { 78 Toast toast = Toast.makeText(mContext, text, Toast.LENGTH_LONG); 79 toast.getWindowParams().privateFlags |= 80 WindowManager.LayoutParams.PRIVATE_FLAG_SHOW_FOR_ALL_USERS; 81 toast.show(); 82 return toast; 83 } 84 85 private final class H extends Handler { 86 private static final int SHOW_TOAST = 3; 87 88 @Override 89 public void handleMessage(Message msg) { 90 switch(msg.what) { 91 case SHOW_TOAST: 92 handleShowToast(msg.arg1); 93 break; 94 } 95 } 96 } 97 } 98