LockTaskNotify.java revision 62515beee67307d8859beec521b7baedfa54b2b5 
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
17package com.android.server.am;
18
19import android.content.BroadcastReceiver;
20import android.content.Context;
21import android.content.Intent;
22import android.content.IntentFilter;
23import android.graphics.PixelFormat;
24import android.os.Handler;
25import android.os.Message;
26import android.util.DisplayMetrics;
27import android.util.Slog;
28import android.view.Gravity;
29import android.view.MotionEvent;
30import android.view.View;
31import android.view.ViewGroup;
32import android.view.WindowManager;
33import android.widget.FrameLayout;
34
35import com.android.internal.R;
36
37/**
38 *  Helper to manage showing/hiding a image to notify them that they are entering
39 *  or exiting lock-to-app mode.
40 */
41public class LockTaskNotify {
42    private static final String TAG = "LockTaskNotify";
43
44    private static final int SHOW_LENGTH_MS = 1500;
45
46    private final Context mContext;
47    private final H mHandler;
48
49    private ClingWindowView mClingWindow;
50    private WindowManager mWindowManager;
51    private boolean mIsStarting;
52
53    public LockTaskNotify(Context context) {
54        mContext = context;
55        mHandler = new H();
56        mWindowManager = (WindowManager)
57                mContext.getSystemService(Context.WINDOW_SERVICE);
58    }
59
60    public void show(boolean starting) {
61        mIsStarting = starting;
62        mHandler.obtainMessage(H.SHOW).sendToTarget();
63    }
64
65    public WindowManager.LayoutParams getClingWindowLayoutParams() {
66        final WindowManager.LayoutParams lp = new WindowManager.LayoutParams(
67                ViewGroup.LayoutParams.MATCH_PARENT,
68                ViewGroup.LayoutParams.MATCH_PARENT,
69                WindowManager.LayoutParams.TYPE_TOAST,
70                0
71                        | WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN
72                        | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
73                        | WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED
74                ,
75                PixelFormat.TRANSLUCENT);
76        lp.privateFlags |= WindowManager.LayoutParams.PRIVATE_FLAG_SHOW_FOR_ALL_USERS;
77        lp.setTitle("LockTaskNotify");
78        lp.windowAnimations = com.android.internal.R.style.Animation_RecentApplications;
79        lp.gravity = Gravity.FILL;
80        return lp;
81    }
82
83    public FrameLayout.LayoutParams getImageLayoutParams() {
84        return new FrameLayout.LayoutParams(
85                ViewGroup.LayoutParams.WRAP_CONTENT,
86                ViewGroup.LayoutParams.WRAP_CONTENT,
87                Gravity.CENTER_HORIZONTAL | Gravity.CENTER_VERTICAL);
88    }
89
90    private void handleShow() {
91        mClingWindow = new ClingWindowView(mContext);
92
93        // we will be hiding the nav bar, so layout as if it's already hidden
94        mClingWindow.setSystemUiVisibility(
95                View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
96              | View.SYSTEM_UI_FLAG_LAYOUT_STABLE);
97
98        // show the confirmation
99        WindowManager.LayoutParams lp = getClingWindowLayoutParams();
100        mWindowManager.addView(mClingWindow, lp);
101    }
102
103    private void handleHide() {
104        if (mClingWindow != null) {
105            mWindowManager.removeView(mClingWindow);
106            mClingWindow = null;
107        }
108    }
109
110
111    private class ClingWindowView extends FrameLayout {
112        private View mView;
113
114        private Runnable mUpdateLayoutRunnable = new Runnable() {
115            @Override
116            public void run() {
117                if (mView != null && mView.getParent() != null) {
118                    mView.setLayoutParams(getImageLayoutParams());
119                }
120            }
121        };
122
123        private BroadcastReceiver mReceiver = new BroadcastReceiver() {
124            @Override
125            public void onReceive(Context context, Intent intent) {
126                if (intent.getAction().equals(Intent.ACTION_CONFIGURATION_CHANGED)) {
127                    post(mUpdateLayoutRunnable);
128                }
129            }
130        };
131
132        public ClingWindowView(Context context) {
133            super(context);
134            setClickable(true);
135        }
136
137        @Override
138        public void onAttachedToWindow() {
139            super.onAttachedToWindow();
140
141            DisplayMetrics metrics = new DisplayMetrics();
142            mWindowManager.getDefaultDisplay().getMetrics(metrics);
143
144            int id = R.layout.lock_to_app_exit;
145            if (mIsStarting) {
146                id = R.layout.lock_to_app_enter;
147            }
148            mView = View.inflate(getContext(), id, null);
149
150            addView(mView, getImageLayoutParams());
151
152            mContext.registerReceiver(mReceiver,
153                    new IntentFilter(Intent.ACTION_CONFIGURATION_CHANGED));
154            mHandler.sendMessageDelayed(mHandler.obtainMessage(H.HIDE), SHOW_LENGTH_MS);
155        }
156
157        @Override
158        public void onDetachedFromWindow() {
159            mContext.unregisterReceiver(mReceiver);
160        }
161
162        @Override
163        public boolean onTouchEvent(MotionEvent motion) {
164            Slog.v(TAG, "ClingWindowView.onTouchEvent");
165            return true;
166        }
167    }
168
169    private final class H extends Handler {
170        private static final int SHOW = 1;
171        private static final int HIDE = 2;
172
173        @Override
174        public void handleMessage(Message msg) {
175            switch(msg.what) {
176                case SHOW:
177                    handleShow();
178                    break;
179                case HIDE:
180                    handleHide();
181                    break;
182            }
183        }
184    }
185}
186