CameraWidgetFrame.java revision 57f928fc4afc02d2fe45523efea687eee7f86c02 
1/*
2 * Copyright (C) 2012 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.internal.policy.impl.keyguard;
18
19import android.content.Context;
20import android.content.pm.PackageManager.NameNotFoundException;
21import android.graphics.Bitmap;
22import android.graphics.Canvas;
23import android.graphics.Color;
24import android.graphics.Point;
25import android.os.Handler;
26import android.os.SystemClock;
27import android.util.Log;
28import android.view.LayoutInflater;
29import android.view.MotionEvent;
30import android.view.View;
31import android.view.ViewGroup;
32import android.view.WindowManager;
33import android.widget.FrameLayout;
34import android.widget.ImageView;
35import android.widget.ImageView.ScaleType;
36
37import com.android.internal.R;
38import com.android.internal.policy.impl.keyguard.KeyguardActivityLauncher.CameraWidgetInfo;
39
40public class CameraWidgetFrame extends KeyguardWidgetFrame implements View.OnClickListener {
41    private static final String TAG = CameraWidgetFrame.class.getSimpleName();
42    private static final boolean DEBUG = KeyguardHostView.DEBUG;
43    private static final int WIDGET_ANIMATION_DURATION = 250; // ms
44    private static final int WIDGET_WAIT_DURATION = 650; // ms
45    private static final int RECOVERY_DELAY = 1000; // ms
46
47    interface Callbacks {
48        void onLaunchingCamera();
49        void onCameraLaunchedSuccessfully();
50        void onCameraLaunchedUnsuccessfully();
51    }
52
53    private final Handler mHandler = new Handler();
54    private final KeyguardActivityLauncher mActivityLauncher;
55    private final Callbacks mCallbacks;
56    private final WindowManager mWindowManager;
57    private final Point mRenderedSize = new Point();
58    private final int[] mScreenLocation = new int[2];
59
60    private View mWidgetView;
61    private long mLaunchCameraStart;
62    private boolean mActive;
63    private boolean mTransitioning;
64    private boolean mRecovering;
65    private boolean mDown;
66
67    private final Runnable mTransitionToCameraRunnable = new Runnable() {
68        @Override
69        public void run() {
70            transitionToCamera();
71        }};
72
73    private final Runnable mTransitionToCameraEndAction = new Runnable() {
74        @Override
75        public void run() {
76            if (!mTransitioning)
77                return;
78            Handler worker =  getWorkerHandler() != null ? getWorkerHandler() : mHandler;
79            mLaunchCameraStart = SystemClock.uptimeMillis();
80            if (DEBUG) Log.d(TAG, "Launching camera at " + mLaunchCameraStart);
81            mActivityLauncher.launchCamera(worker, mSecureCameraActivityStartedRunnable);
82        }};
83
84    private final Runnable mRecoverRunnable = new Runnable() {
85        @Override
86        public void run() {
87            recover();
88        }};
89
90    private final Runnable mRecoverEndAction = new Runnable() {
91        @Override
92        public void run() {
93            if (!mRecovering)
94                return;
95            mCallbacks.onCameraLaunchedUnsuccessfully();
96            reset();
97        }};
98
99    private final Runnable mRenderRunnable = new Runnable() {
100        @Override
101        public void run() {
102            render();
103        }};
104
105    private final Runnable mSecureCameraActivityStartedRunnable = new Runnable() {
106        @Override
107        public void run() {
108            onSecureCameraActivityStarted();
109        }
110    };
111
112    private final KeyguardUpdateMonitorCallback mCallback = new KeyguardUpdateMonitorCallback() {
113        private boolean mShowing;
114        void onKeyguardVisibilityChanged(boolean showing) {
115            if (mShowing == showing)
116                return;
117            mShowing = showing;
118            CameraWidgetFrame.this.onKeyguardVisibilityChanged(mShowing);
119        };
120    };
121
122    private CameraWidgetFrame(Context context, Callbacks callbacks,
123            KeyguardActivityLauncher activityLauncher) {
124        super(context);
125        mCallbacks = callbacks;
126        mActivityLauncher = activityLauncher;
127        mWindowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
128        KeyguardUpdateMonitor.getInstance(context).registerCallback(mCallback);
129        if (DEBUG) Log.d(TAG, "new CameraWidgetFrame instance " + instanceId());
130    }
131
132    public static CameraWidgetFrame create(Context context, Callbacks callbacks,
133            KeyguardActivityLauncher launcher) {
134        if (context == null || callbacks == null || launcher == null)
135            return null;
136
137        CameraWidgetInfo widgetInfo = launcher.getCameraWidgetInfo();
138        if (widgetInfo == null)
139            return null;
140        View widgetView = widgetInfo.layoutId > 0 ?
141                inflateWidgetView(context, widgetInfo) :
142                inflateGenericWidgetView(context);
143        if (widgetView == null)
144            return null;
145
146        ImageView preview = new ImageView(context);
147        preview.setLayoutParams(new FrameLayout.LayoutParams(
148                FrameLayout.LayoutParams.MATCH_PARENT,
149                FrameLayout.LayoutParams.MATCH_PARENT));
150        preview.setScaleType(ScaleType.FIT_CENTER);
151        preview.setContentDescription(preview.getContext().getString(
152                R.string.keyguard_accessibility_camera));
153        CameraWidgetFrame cameraWidgetFrame = new CameraWidgetFrame(context, callbacks, launcher);
154        cameraWidgetFrame.addView(preview);
155        cameraWidgetFrame.mWidgetView = widgetView;
156        preview.setOnClickListener(cameraWidgetFrame);
157        return cameraWidgetFrame;
158    }
159
160    private static View inflateWidgetView(Context context, CameraWidgetInfo widgetInfo) {
161        if (DEBUG) Log.d(TAG, "inflateWidgetView: " + widgetInfo.contextPackage);
162        View widgetView = null;
163        Exception exception = null;
164        try {
165            Context cameraContext = context.createPackageContext(
166                    widgetInfo.contextPackage, Context.CONTEXT_RESTRICTED);
167            LayoutInflater cameraInflater = (LayoutInflater)
168                    cameraContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
169            cameraInflater = cameraInflater.cloneInContext(cameraContext);
170            widgetView = cameraInflater.inflate(widgetInfo.layoutId, null, false);
171        } catch (NameNotFoundException e) {
172            exception = e;
173        } catch (RuntimeException e) {
174            exception = e;
175        }
176        if (exception != null) {
177            Log.w(TAG, "Error creating camera widget view", exception);
178        }
179        return widgetView;
180    }
181
182    private static View inflateGenericWidgetView(Context context) {
183        if (DEBUG) Log.d(TAG, "inflateGenericWidgetView");
184        ImageView iv = new ImageView(context);
185        iv.setImageResource(com.android.internal.R.drawable.ic_lockscreen_camera);
186        iv.setScaleType(ScaleType.CENTER);
187        iv.setBackgroundColor(Color.argb(127, 0, 0, 0));
188        return iv;
189    }
190
191    public void render() {
192        final Throwable[] thrown = new Throwable[1];
193        final Bitmap[] offscreen = new Bitmap[1];
194        try {
195            final int width = getRootView().getWidth();
196            final int height = getRootView().getHeight();
197            if (mRenderedSize.x == width && mRenderedSize.y == height) {
198                if (DEBUG) Log.d(TAG, String.format("Already rendered at size=%sx%s",
199                        width, height));
200                return;
201            }
202            if (width == 0 || height == 0) {
203                return;
204            }
205            final long start = SystemClock.uptimeMillis();
206            offscreen[0] = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
207            final Canvas c = new Canvas(offscreen[0]);
208            mWidgetView.measure(
209                    MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY),
210                    MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY));
211            mWidgetView.layout(0, 0, width, height);
212            mWidgetView.draw(c);
213
214            final long end = SystemClock.uptimeMillis();
215            if (DEBUG) Log.d(TAG, String.format(
216                    "Rendered camera widget in %sms size=%sx%s instance=%s at %s",
217                    end - start,
218                    width, height,
219                    instanceId(),
220                    end));
221            mRenderedSize.set(width, height);
222        } catch (Throwable t) {
223            thrown[0] = t;
224        }
225
226        mHandler.post(new Runnable() {
227            @Override
228            public void run() {
229                if (thrown[0] == null) {
230                    try {
231                        ((ImageView) getChildAt(0)).setImageBitmap(offscreen[0]);
232                    } catch (Throwable t) {
233                        thrown[0] = t;
234                    }
235                }
236                if (thrown[0] == null)
237                    return;
238
239                Log.w(TAG, "Error rendering camera widget", thrown[0]);
240                try {
241                    removeAllViews();
242                    final View genericView = inflateGenericWidgetView(mContext);
243                    addView(genericView);
244                } catch (Throwable t) {
245                    Log.w(TAG, "Error inflating generic camera widget", t);
246                }
247            }});
248    }
249
250    private void transitionToCamera() {
251        if (mTransitioning || mDown) return;
252
253        mTransitioning = true;
254
255        final View child = getChildAt(0);
256        final View root = getRootView();
257
258        final int startWidth = child.getWidth();
259        final int startHeight = child.getHeight();
260
261        final int finishWidth = root.getWidth();
262        final int finishHeight = root.getHeight();
263
264        final float scaleX = (float) finishWidth / startWidth;
265        final float scaleY = (float) finishHeight / startHeight;
266        final float scale = Math.round( Math.max(scaleX, scaleY) * 100) / 100f;
267
268        final int[] loc = new int[2];
269        root.getLocationInWindow(loc);
270        final int finishCenter = loc[1] + finishHeight / 2;
271
272        child.getLocationInWindow(loc);
273        final int startCenter = loc[1] + startHeight / 2;
274
275        if (DEBUG) Log.d(TAG, String.format("Transitioning to camera. " +
276                "(start=%sx%s, finish=%sx%s, scale=%s,%s, startCenter=%s, finishCenter=%s)",
277                startWidth, startHeight,
278                finishWidth, finishHeight,
279                scaleX, scaleY,
280                startCenter, finishCenter));
281
282        enableWindowExitAnimation(false);
283        animate()
284            .scaleX(scale)
285            .scaleY(scale)
286            .translationY(finishCenter - startCenter)
287            .setDuration(WIDGET_ANIMATION_DURATION)
288            .withEndAction(mTransitionToCameraEndAction)
289            .start();
290
291        mCallbacks.onLaunchingCamera();
292    }
293
294    private void recover() {
295        if (DEBUG) Log.d(TAG, "recovering at " + SystemClock.uptimeMillis());
296        mRecovering = true;
297        animate()
298            .scaleX(1)
299            .scaleY(1)
300            .translationY(0)
301            .setDuration(WIDGET_ANIMATION_DURATION)
302            .withEndAction(mRecoverEndAction)
303            .start();
304    }
305
306    @Override
307    public void onClick(View v) {
308        if (DEBUG) Log.d(TAG, "clicked");
309        if (mTransitioning) return;
310        if (mActive) {
311            cancelTransitionToCamera();
312            transitionToCamera();
313        }
314    }
315
316    @Override
317    protected void onDetachedFromWindow() {
318        if (DEBUG) Log.d(TAG, "onDetachedFromWindow: instance " + instanceId()
319                + " at " + SystemClock.uptimeMillis());
320        super.onDetachedFromWindow();
321        KeyguardUpdateMonitor.getInstance(mContext).removeCallback(mCallback);
322        cancelTransitionToCamera();
323        mHandler.removeCallbacks(mRecoverRunnable);
324    }
325
326    @Override
327    public void onActive(boolean isActive) {
328        mActive = isActive;
329        if (mActive) {
330            rescheduleTransitionToCamera();
331        } else {
332            reset();
333        }
334    }
335
336    @Override
337    public boolean onUserInteraction(MotionEvent event) {
338        if (mTransitioning) {
339            if (DEBUG) Log.d(TAG, "onUserInteraction eaten: mTransitioning");
340            return true;
341        }
342
343        getLocationOnScreen(mScreenLocation);
344        int rawBottom = mScreenLocation[1] + getHeight();
345        if (event.getRawY() > rawBottom) {
346            if (DEBUG) Log.d(TAG, "onUserInteraction eaten: below widget");
347            return true;
348        }
349
350        int action = event.getAction();
351        mDown = action == MotionEvent.ACTION_DOWN || action == MotionEvent.ACTION_MOVE;
352        if (mActive) {
353            rescheduleTransitionToCamera();
354        }
355        if (DEBUG) Log.d(TAG, "onUserInteraction observed, not eaten");
356        return false;
357    }
358
359    @Override
360    protected void onFocusLost() {
361        if (DEBUG) Log.d(TAG, "onFocusLost at " + SystemClock.uptimeMillis());
362        cancelTransitionToCamera();
363        super.onFocusLost();
364    }
365
366    public void onScreenTurnedOff() {
367        if (DEBUG) Log.d(TAG, "onScreenTurnedOff");
368        reset();
369    }
370
371    private void rescheduleTransitionToCamera() {
372        if (DEBUG) Log.d(TAG, "rescheduleTransitionToCamera at " + SystemClock.uptimeMillis());
373        mHandler.removeCallbacks(mTransitionToCameraRunnable);
374        mHandler.postDelayed(mTransitionToCameraRunnable, WIDGET_WAIT_DURATION);
375    }
376
377    private void cancelTransitionToCamera() {
378        if (DEBUG) Log.d(TAG, "cancelTransitionToCamera at " + SystemClock.uptimeMillis());
379        mHandler.removeCallbacks(mTransitionToCameraRunnable);
380    }
381
382    private void onCameraLaunched() {
383        mCallbacks.onCameraLaunchedSuccessfully();
384        reset();
385    }
386
387    private void reset() {
388        if (DEBUG) Log.d(TAG, "reset at " + SystemClock.uptimeMillis());
389        mLaunchCameraStart = 0;
390        mTransitioning = false;
391        mRecovering = false;
392        mDown = false;
393        cancelTransitionToCamera();
394        mHandler.removeCallbacks(mRecoverRunnable);
395        animate().cancel();
396        setScaleX(1);
397        setScaleY(1);
398        setTranslationY(0);
399        enableWindowExitAnimation(true);
400    }
401
402    @Override
403    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
404        if (DEBUG) Log.d(TAG, String.format("onSizeChanged new=%sx%s old=%sx%s at %s",
405                w, h, oldw, oldh, SystemClock.uptimeMillis()));
406        final Handler worker =  getWorkerHandler();
407        (worker != null ? worker : mHandler).post(mRenderRunnable);
408        super.onSizeChanged(w, h, oldw, oldh);
409    }
410
411    private void enableWindowExitAnimation(boolean isEnabled) {
412        View root = getRootView();
413        ViewGroup.LayoutParams lp = root.getLayoutParams();
414        if (!(lp instanceof WindowManager.LayoutParams))
415            return;
416        WindowManager.LayoutParams wlp = (WindowManager.LayoutParams) lp;
417        int newWindowAnimations = isEnabled ? com.android.internal.R.style.Animation_LockScreen : 0;
418        if (newWindowAnimations != wlp.windowAnimations) {
419            if (DEBUG) Log.d(TAG, "setting windowAnimations to: " + newWindowAnimations
420                    + " at " + SystemClock.uptimeMillis());
421            wlp.windowAnimations = newWindowAnimations;
422            mWindowManager.updateViewLayout(root, wlp);
423        }
424    }
425
426    private void onKeyguardVisibilityChanged(boolean showing) {
427        if (DEBUG) Log.d(TAG, "onKeyguardVisibilityChanged " + showing
428                + " at " + SystemClock.uptimeMillis());
429        if (mTransitioning && !showing) {
430          mTransitioning = false;
431          mRecovering = false;
432          mHandler.removeCallbacks(mRecoverRunnable);
433          if (mLaunchCameraStart > 0) {
434              long launchTime = SystemClock.uptimeMillis() - mLaunchCameraStart;
435              if (DEBUG) Log.d(TAG, String.format("Camera took %sms to launch", launchTime));
436              mLaunchCameraStart = 0;
437              onCameraLaunched();
438          }
439        }
440    }
441
442    private void onSecureCameraActivityStarted() {
443        if (DEBUG) Log.d(TAG, "onSecureCameraActivityStarted at " + SystemClock.uptimeMillis());
444        mHandler.postDelayed(mRecoverRunnable, RECOVERY_DELAY);
445    }
446
447    private String instanceId() {
448        return Integer.toHexString(hashCode());
449    }
450}
451