GlobalScreenshot.java revision d859fa399133da32705415e138c897f263ae99ad 
1/*
2 * Copyright (C) 2011 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.systemui.screenshot;
18
19import android.animation.Animator;
20import android.animation.AnimatorListenerAdapter;
21import android.animation.AnimatorSet;
22import android.animation.ObjectAnimator;
23import android.animation.TimeInterpolator;
24import android.animation.ValueAnimator;
25import android.animation.ValueAnimator.AnimatorUpdateListener;
26import android.app.Activity;
27import android.content.ContentValues;
28import android.content.Context;
29import android.graphics.Bitmap;
30import android.graphics.Canvas;
31import android.graphics.Matrix;
32import android.graphics.PixelFormat;
33import android.media.MediaScannerConnection;
34import android.net.Uri;
35import android.os.AsyncTask;
36import android.os.Binder;
37import android.os.Environment;
38import android.os.ServiceManager;
39import android.provider.MediaStore;
40import android.util.DisplayMetrics;
41import android.util.Log;
42import android.view.Display;
43import android.view.IWindowManager;
44import android.view.LayoutInflater;
45import android.view.MotionEvent;
46import android.view.Surface;
47import android.view.View;
48import android.view.ViewGroup;
49import android.view.WindowManager;
50import android.widget.FrameLayout;
51import android.widget.ImageView;
52import android.widget.TextView;
53import android.widget.Toast;
54
55import com.android.systemui.R;
56
57import java.io.File;
58import java.io.FileOutputStream;
59import java.io.IOException;
60import java.io.OutputStream;
61import java.lang.Thread;
62import java.text.SimpleDateFormat;
63import java.util.Date;
64
65/**
66 * POD used in the AsyncTask which saves an image in the background.
67 */
68class SaveImageInBackgroundData {
69    Context context;
70    Bitmap image;
71    int result;
72}
73
74/**
75 * An AsyncTask that saves an image to the media store in the background.
76 */
77class SaveImageInBackgroundTask extends AsyncTask<SaveImageInBackgroundData, Void,
78        SaveImageInBackgroundData> {
79    private static final String TAG = "SaveImageInBackgroundTask";
80    private static final String SCREENSHOTS_DIR_NAME = "Screenshots";
81    private static final String SCREENSHOT_FILE_PATH_TEMPLATE = "%s/%s/Screenshot_%s-%d.png";
82
83    @Override
84    protected SaveImageInBackgroundData doInBackground(SaveImageInBackgroundData... params) {
85        if (params.length != 1) return null;
86
87        Context context = params[0].context;
88        Bitmap image = params[0].image;
89
90        try {
91            long currentTime = System.currentTimeMillis();
92            String date = new SimpleDateFormat("MM-dd-yy-kk-mm-ss").format(new Date(currentTime));
93            String imageDir = Environment.getExternalStoragePublicDirectory(
94                    Environment.DIRECTORY_PICTURES).getAbsolutePath();
95            String imageFilePath = String.format(SCREENSHOT_FILE_PATH_TEMPLATE,
96                    imageDir, SCREENSHOTS_DIR_NAME,
97                    date, currentTime % 1000);
98
99            // Save the screenshot to the MediaStore
100            ContentValues values = new ContentValues();
101            values.put(MediaStore.Images.ImageColumns.DATA, imageFilePath);
102            values.put(MediaStore.Images.ImageColumns.TITLE, "Screenshot");
103            values.put(MediaStore.Images.ImageColumns.DISPLAY_NAME, "Screenshot");
104            values.put(MediaStore.Images.ImageColumns.DATE_TAKEN, currentTime);
105            values.put(MediaStore.Images.ImageColumns.DATE_ADDED, currentTime);
106            values.put(MediaStore.Images.ImageColumns.DATE_MODIFIED, currentTime);
107            values.put(MediaStore.Images.ImageColumns.MIME_TYPE, "image/png");
108            Uri uri = context.getContentResolver().insert(
109                        MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
110
111            OutputStream out = context.getContentResolver().openOutputStream(uri);
112            image.compress(Bitmap.CompressFormat.PNG, 100, out);
113            out.flush();
114            out.close();
115
116            params[0].result = 0;
117        } catch (Exception e) {
118            // IOException/UnsupportedOperationException may be thrown if external storage is not
119            // mounted
120            params[0].result = 1;
121        }
122
123        return params[0];
124    };
125
126    @Override
127    protected void onPostExecute(SaveImageInBackgroundData params) {
128        if (params.result > 0) {
129            // Show a message that we've failed to save the image to disk
130            Toast.makeText(params.context, R.string.screenshot_failed_toast,
131                    Toast.LENGTH_SHORT).show();
132        } else {
133            // Show a message that we've saved the screenshot to disk
134            Toast.makeText(params.context, R.string.screenshot_saving_toast,
135                    Toast.LENGTH_SHORT).show();
136        }
137    };
138}
139
140/**
141 * TODO:
142 *   - Performance when over gl surfaces? Ie. Gallery
143 *   - what do we say in the Toast? Which icon do we get if the user uses another
144 *     type of gallery?
145 */
146class GlobalScreenshot {
147    private static final String TAG = "GlobalScreenshot";
148    private static final int SCREENSHOT_FADE_IN_DURATION = 900;
149    private static final int SCREENSHOT_FADE_OUT_DELAY = 1000;
150    private static final int SCREENSHOT_FADE_OUT_DURATION = 450;
151    private static final int TOAST_FADE_IN_DURATION = 500;
152    private static final int TOAST_FADE_OUT_DELAY = 1000;
153    private static final int TOAST_FADE_OUT_DURATION = 500;
154    private static final float BACKGROUND_ALPHA = 0.65f;
155    private static final float SCREENSHOT_SCALE = 0.85f;
156    private static final float SCREENSHOT_MIN_SCALE = 0.7f;
157    private static final float SCREENSHOT_ROTATION = -6.75f; // -12.5f;
158
159    private Context mContext;
160    private LayoutInflater mLayoutInflater;
161    private IWindowManager mIWindowManager;
162    private WindowManager mWindowManager;
163    private WindowManager.LayoutParams mWindowLayoutParams;
164    private Display mDisplay;
165    private DisplayMetrics mDisplayMetrics;
166    private Matrix mDisplayMatrix;
167
168    private Bitmap mScreenBitmap;
169    private View mScreenshotLayout;
170    private ImageView mBackgroundView;
171    private FrameLayout mScreenshotContainerView;
172    private ImageView mScreenshotView;
173
174    private AnimatorSet mScreenshotAnimation;
175
176    // General use cubic interpolator
177    final TimeInterpolator mCubicInterpolator = new TimeInterpolator() {
178        public float getInterpolation(float t) {
179            return t*t*t;
180        }
181    };
182    // The interpolator used to control the background alpha at the start of the animation
183    final TimeInterpolator mBackgroundViewAlphaInterpolator = new TimeInterpolator() {
184        public float getInterpolation(float t) {
185            float tStep = 0.35f;
186            if (t < tStep) {
187                return t * (1f / tStep);
188            } else {
189                return 1f;
190            }
191        }
192    };
193
194    /**
195     * @param context everything needs a context :(
196     */
197    public GlobalScreenshot(Context context) {
198        mContext = context;
199        mLayoutInflater = (LayoutInflater)
200                context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
201
202        // Inflate the screenshot layout
203        mDisplayMetrics = new DisplayMetrics();
204        mDisplayMatrix = new Matrix();
205        mScreenshotLayout = mLayoutInflater.inflate(R.layout.global_screenshot, null);
206        mBackgroundView = (ImageView) mScreenshotLayout.findViewById(R.id.global_screenshot_background);
207        mScreenshotContainerView = (FrameLayout) mScreenshotLayout.findViewById(R.id.global_screenshot_container);
208        mScreenshotView = (ImageView) mScreenshotLayout.findViewById(R.id.global_screenshot);
209        mScreenshotLayout.setFocusable(true);
210        mScreenshotLayout.setOnTouchListener(new View.OnTouchListener() {
211            @Override
212            public boolean onTouch(View v, MotionEvent event) {
213                // Intercept and ignore all touch events
214                return true;
215            }
216        });
217
218        // Setup the window that we are going to use
219        mIWindowManager = IWindowManager.Stub.asInterface(
220                ServiceManager.getService(Context.WINDOW_SERVICE));
221        mWindowLayoutParams = new WindowManager.LayoutParams(
222                ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT, 0, 0,
223                WindowManager.LayoutParams.TYPE_SECURE_SYSTEM_OVERLAY,
224                WindowManager.LayoutParams.FLAG_FULLSCREEN
225                    | WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED
226                    | WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED_SYSTEM
227                    | WindowManager.LayoutParams.FLAG_KEEP_SURFACE_WHILE_ANIMATING
228                    | WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN
229                    | WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED,
230                PixelFormat.TRANSLUCENT);
231        mWindowLayoutParams.token = new Binder();
232        mWindowLayoutParams.setTitle("ScreenshotAnimation");
233        mWindowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
234        mDisplay = mWindowManager.getDefaultDisplay();
235    }
236
237    /**
238     * Creates a new worker thread and saves the screenshot to the media store.
239     */
240    private void saveScreenshotInWorkerThread() {
241        SaveImageInBackgroundData data = new SaveImageInBackgroundData();
242        data.context = mContext;
243        data.image = mScreenBitmap;
244        new SaveImageInBackgroundTask().execute(data);
245    }
246
247    /**
248     * @return the current display rotation in degrees
249     */
250    private float getDegreesForRotation(int value) {
251        switch (value) {
252        case Surface.ROTATION_90:
253            return 90f;
254        case Surface.ROTATION_180:
255            return 180f;
256        case Surface.ROTATION_270:
257            return 270f;
258        }
259        return 0f;
260    }
261
262    /**
263     * Takes a screenshot of the current display and shows an animation.
264     */
265    void takeScreenshot() {
266        // We need to orient the screenshot correctly (and the Surface api seems to take screenshots
267        // only in the natural orientation of the device :!)
268        mDisplay.getRealMetrics(mDisplayMetrics);
269        float[] dims = {mDisplayMetrics.widthPixels, mDisplayMetrics.heightPixels};
270        float degrees = getDegreesForRotation(mDisplay.getRotation());
271        boolean requiresRotation = (degrees > 0);
272        if (requiresRotation) {
273            // Get the dimensions of the device in its native orientation
274            mDisplayMatrix.reset();
275            mDisplayMatrix.preRotate(-degrees);
276            mDisplayMatrix.mapPoints(dims);
277            dims[0] = Math.abs(dims[0]);
278            dims[1] = Math.abs(dims[1]);
279        }
280        mScreenBitmap = Surface.screenshot((int) dims[0], (int) dims[1]);
281        if (requiresRotation) {
282            // Rotate the screenshot to the current orientation
283            Bitmap ss = Bitmap.createBitmap(mDisplayMetrics.widthPixels,
284                    mDisplayMetrics.heightPixels, Bitmap.Config.ARGB_8888);
285            Canvas c = new Canvas(ss);
286            c.translate(ss.getWidth() / 2, ss.getHeight() / 2);
287            c.rotate(360f - degrees);
288            c.translate(-dims[0] / 2, -dims[1] / 2);
289            c.drawBitmap(mScreenBitmap, 0, 0, null);
290            mScreenBitmap = ss;
291        }
292
293        // If we couldn't take the screenshot, notify the user
294        if (mScreenBitmap == null) {
295            Toast.makeText(mContext, R.string.screenshot_failed_toast,
296                    Toast.LENGTH_SHORT).show();
297            return;
298        }
299
300        // Start the post-screenshot animation
301        startAnimation();
302    }
303
304
305    /**
306     * Starts the animation after taking the screenshot
307     */
308    private void startAnimation() {
309        // Add the view for the animation
310        mScreenshotView.setImageBitmap(mScreenBitmap);
311        mScreenshotLayout.requestFocus();
312
313        // Setup the animation with the screenshot just taken
314        if (mScreenshotAnimation != null) {
315            mScreenshotAnimation.end();
316        }
317
318        mWindowManager.addView(mScreenshotLayout, mWindowLayoutParams);
319        ValueAnimator screenshotFadeInAnim = createScreenshotFadeInAnimation();
320        ValueAnimator screenshotFadeOutAnim = createScreenshotFadeOutAnimation();
321        mScreenshotAnimation = new AnimatorSet();
322        mScreenshotAnimation.play(screenshotFadeInAnim).before(screenshotFadeOutAnim);
323        mScreenshotAnimation.addListener(new AnimatorListenerAdapter() {
324            @Override
325            public void onAnimationEnd(Animator animation) {
326                // Save the screenshot once we have a bit of time now
327                saveScreenshotInWorkerThread();
328
329                mWindowManager.removeView(mScreenshotLayout);
330            }
331        });
332        mScreenshotAnimation.start();
333    }
334    private ValueAnimator createScreenshotFadeInAnimation() {
335        ValueAnimator anim = ValueAnimator.ofFloat(0f, 1f);
336        anim.setInterpolator(mCubicInterpolator);
337        anim.setDuration(SCREENSHOT_FADE_IN_DURATION);
338        anim.addListener(new AnimatorListenerAdapter() {
339            @Override
340            public void onAnimationStart(Animator animation) {
341                mBackgroundView.setVisibility(View.VISIBLE);
342                mScreenshotContainerView.setVisibility(View.VISIBLE);
343            }
344        });
345        anim.addUpdateListener(new AnimatorUpdateListener() {
346            @Override
347            public void onAnimationUpdate(ValueAnimator animation) {
348                float t = ((Float) animation.getAnimatedValue()).floatValue();
349                mBackgroundView.setAlpha(mBackgroundViewAlphaInterpolator.getInterpolation(t) *
350                        BACKGROUND_ALPHA);
351                float scaleT = SCREENSHOT_SCALE + (1f - t) * SCREENSHOT_SCALE;
352                mScreenshotContainerView.setAlpha(t*t*t*t);
353                mScreenshotContainerView.setScaleX(scaleT);
354                mScreenshotContainerView.setScaleY(scaleT);
355                mScreenshotContainerView.setRotation(t * SCREENSHOT_ROTATION);
356            }
357        });
358        return anim;
359    }
360    private ValueAnimator createScreenshotFadeOutAnimation() {
361        ValueAnimator anim = ValueAnimator.ofFloat(1f, 0f);
362        anim.setInterpolator(mCubicInterpolator);
363        anim.setStartDelay(SCREENSHOT_FADE_OUT_DELAY);
364        anim.setDuration(SCREENSHOT_FADE_OUT_DURATION);
365        anim.addListener(new AnimatorListenerAdapter() {
366            @Override
367            public void onAnimationEnd(Animator animation) {
368                mBackgroundView.setVisibility(View.GONE);
369                mScreenshotContainerView.setVisibility(View.GONE);
370            }
371        });
372        anim.addUpdateListener(new AnimatorUpdateListener() {
373            @Override
374            public void onAnimationUpdate(ValueAnimator animation) {
375                float t = ((Float) animation.getAnimatedValue()).floatValue();
376                float scaleT = SCREENSHOT_MIN_SCALE +
377                        t*(SCREENSHOT_SCALE - SCREENSHOT_MIN_SCALE);
378                mScreenshotContainerView.setAlpha(t);
379                mScreenshotContainerView.setScaleX(scaleT);
380                mScreenshotContainerView.setScaleY(scaleT);
381                mBackgroundView.setAlpha(t * t * BACKGROUND_ALPHA);
382            }
383        });
384        return anim;
385    }
386}
387