LockTaskNotify.java revision a8f569c10a423ced5be7e019c3df2bca11b052f5 
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.content.res.Resources;
24import android.graphics.BitmapFactory;
25import android.graphics.PixelFormat;
26import android.os.Handler;
27import android.os.Message;
28import android.text.Spannable;
29import android.text.SpannableString;
30import android.text.style.DynamicDrawableSpan;
31import android.text.style.ImageSpan;
32import android.util.DisplayMetrics;
33import android.util.Slog;
34import android.view.Gravity;
35import android.view.MotionEvent;
36import android.view.View;
37import android.view.ViewGroup;
38import android.view.WindowManager;
39import android.widget.FrameLayout;
40import android.widget.TextView;
41import android.widget.Toast;
42
43import com.android.internal.R;
44
45/**
46 *  Helper to manage showing/hiding a image to notify them that they are entering
47 *  or exiting lock-to-app mode.
48 */
49public class LockTaskNotify {
50    private static final String TAG = "LockTaskNotify";
51
52    private static final int SHOW_LENGTH_MS = 1500;
53
54    private final Context mContext;
55    private final H mHandler;
56
57    private ClingWindowView mClingWindow;
58    private WindowManager mWindowManager;
59    private boolean mIsStarting;
60
61    public LockTaskNotify(Context context) {
62        mContext = context;
63        mHandler = new H();
64        mWindowManager = (WindowManager)
65                mContext.getSystemService(Context.WINDOW_SERVICE);
66    }
67
68    public void showToast(boolean isLocked) {
69        mHandler.obtainMessage(H.SHOW_TOAST, isLocked ? 1 : 0, 0 /* Not used */).sendToTarget();
70    }
71
72    public void handleShowToast(boolean isLocked) {
73        final Resources r = Resources.getSystem();
74        String text = mContext.getString(isLocked
75                ? R.string.lock_to_app_toast_locked : R.string.lock_to_app_toast);
76        Toast toast = Toast.makeText(mContext, text, Toast.LENGTH_LONG);
77        TextView tv = (TextView) toast.getView().findViewById(R.id.message);
78
79        if (isLocked) {
80            tv.setText(text);
81        } else {
82            final SpannableString formattedText =
83                    new SpannableString(text.replace('$', ' '));
84            final ImageSpan imageSpan = new ImageSpan(mContext,
85                    BitmapFactory.decodeResource(r, R.drawable.ic_recent),
86                    DynamicDrawableSpan.ALIGN_BOTTOM);
87            final int index = text.indexOf('$');
88            if (index >= 0) {
89                formattedText.setSpan(imageSpan, index, index + 1,
90                        Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
91            }
92
93            // Make icon fit.
94            final float width = imageSpan.getDrawable().getIntrinsicWidth();
95            final float height = imageSpan.getDrawable().getIntrinsicHeight();
96            final int lineHeight = tv.getLineHeight();
97            imageSpan.getDrawable().setBounds(0, 0, (int) (lineHeight * width / height),
98                    lineHeight);
99
100            tv.setText(formattedText);
101        }
102
103
104        toast.show();
105    }
106
107    public void show(boolean starting) {
108        mIsStarting = starting;
109        mHandler.obtainMessage(H.SHOW).sendToTarget();
110    }
111
112    public WindowManager.LayoutParams getClingWindowLayoutParams() {
113        final WindowManager.LayoutParams lp = new WindowManager.LayoutParams(
114                ViewGroup.LayoutParams.MATCH_PARENT,
115                ViewGroup.LayoutParams.MATCH_PARENT,
116                WindowManager.LayoutParams.TYPE_TOAST,
117                0
118                        | WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN
119                        | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
120                        | WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED
121                ,
122                PixelFormat.TRANSLUCENT);
123        lp.privateFlags |= WindowManager.LayoutParams.PRIVATE_FLAG_SHOW_FOR_ALL_USERS;
124        lp.setTitle("LockTaskNotify");
125        lp.windowAnimations = com.android.internal.R.style.Animation_RecentApplications;
126        lp.gravity = Gravity.FILL;
127        return lp;
128    }
129
130    public FrameLayout.LayoutParams getImageLayoutParams() {
131        return new FrameLayout.LayoutParams(
132                ViewGroup.LayoutParams.WRAP_CONTENT,
133                ViewGroup.LayoutParams.WRAP_CONTENT,
134                Gravity.CENTER_HORIZONTAL | Gravity.CENTER_VERTICAL);
135    }
136
137    private void handleShow() {
138        mClingWindow = new ClingWindowView(mContext);
139
140        // we will be hiding the nav bar, so layout as if it's already hidden
141        mClingWindow.setSystemUiVisibility(
142                View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
143              | View.SYSTEM_UI_FLAG_LAYOUT_STABLE);
144
145        // show the confirmation
146        WindowManager.LayoutParams lp = getClingWindowLayoutParams();
147        mWindowManager.addView(mClingWindow, lp);
148    }
149
150    private void handleHide() {
151        if (mClingWindow != null) {
152            mWindowManager.removeView(mClingWindow);
153            mClingWindow = null;
154        }
155    }
156
157
158    private class ClingWindowView extends FrameLayout {
159        private View mView;
160
161        private Runnable mUpdateLayoutRunnable = new Runnable() {
162            @Override
163            public void run() {
164                if (mView != null && mView.getParent() != null) {
165                    mView.setLayoutParams(getImageLayoutParams());
166                }
167            }
168        };
169
170        private BroadcastReceiver mReceiver = new BroadcastReceiver() {
171            @Override
172            public void onReceive(Context context, Intent intent) {
173                if (intent.getAction().equals(Intent.ACTION_CONFIGURATION_CHANGED)) {
174                    post(mUpdateLayoutRunnable);
175                }
176            }
177        };
178
179        public ClingWindowView(Context context) {
180            super(context);
181            setClickable(true);
182        }
183
184        @Override
185        public void onAttachedToWindow() {
186            super.onAttachedToWindow();
187
188            DisplayMetrics metrics = new DisplayMetrics();
189            mWindowManager.getDefaultDisplay().getMetrics(metrics);
190
191            int id = R.layout.lock_to_app_exit;
192            if (mIsStarting) {
193                id = R.layout.lock_to_app_enter;
194            }
195            mView = View.inflate(getContext(), id, null);
196
197            addView(mView, getImageLayoutParams());
198
199            mContext.registerReceiver(mReceiver,
200                    new IntentFilter(Intent.ACTION_CONFIGURATION_CHANGED));
201            mHandler.sendMessageDelayed(mHandler.obtainMessage(H.HIDE), SHOW_LENGTH_MS);
202        }
203
204        @Override
205        public void onDetachedFromWindow() {
206            mContext.unregisterReceiver(mReceiver);
207        }
208
209        @Override
210        public boolean onTouchEvent(MotionEvent motion) {
211            Slog.v(TAG, "ClingWindowView.onTouchEvent");
212            return true;
213        }
214    }
215
216    private final class H extends Handler {
217        private static final int SHOW = 1;
218        private static final int HIDE = 2;
219        private static final int SHOW_TOAST = 3;
220
221        @Override
222        public void handleMessage(Message msg) {
223            switch(msg.what) {
224                case SHOW:
225                    handleShow();
226                    break;
227                case HIDE:
228                    handleHide();
229                    break;
230                case SHOW_TOAST:
231                    handleShowToast(msg.arg1 != 0);
232                    break;
233            }
234        }
235    }
236}
237