Android 工具类 —— 截屏

Android 8.0 截屏

/** * 快照工具 */public class SnapShotUtil {    /**     * 获取屏幕截图。     */    public static Bitmap getScreen(Activity activity) {        View view = activity.getWindow().getDecorView();        //启用绘制缓存        view.setDrawingCacheEnabled(true);        //构建缓存视图        view.buildDrawingCache();        //获得视图的缓存图像        Bitmap cache = view.getDrawingCache();        //状态栏区只有背景色，却截取不到任何文字，因此要手动裁剪掉        Rect activityRect = new Rect();        //获取当前activity的可见区域        view.getWindowVisibleDisplayFrame(activityRect);        Bitmap bitmap = BitmapUtil.crop(cache, activityRect);        //关闭视图缓存机制        view.setDrawingCacheEnabled(false);        //删除视图缓存        view.destroyDrawingCache();        return bitmap;    }    /**     * 通过系统录屏截图     */    public static void getScreenProjection(FragmentActivity activity, Callback callback) {        //调用系统服务，会弹出一个是否允许录屏的对话框        MediaProjectionManager mediaProjectionManager = (MediaProjectionManager) activity.getSystemService(Context.MEDIA_PROJECTION_SERVICE);        Intent intent = mediaProjectionManager.createScreenCaptureIntent();        ActivityLauncher.init(activity).startActivityForResult(intent, (resultCode, data) -> {            MediaProjection mediaProjection = mediaProjectionManager.getMediaProjection(resultCode, data);            //返回null，说明用户拒绝            if (mediaProjection == null) {                return;            }            Point screenSize = DisplayUtil.getResolution(activity);            /*            The producer output buffer format 0x1 doesn't match the ImageReader's configured buffer format 0x4.            所以各式只能用8888，不能用565             */            ImageReader imageReader = ImageReader.newInstance(screenSize.x, screenSize.y, PixelFormat.RGBA_8888, 1);            int densityDpi = DisplayUtil.getDensityDpi(activity);            VirtualDisplay virtualDisplay = mediaProjection.createVirtualDisplay("screen-mirror",                    screenSize.x,                    screenSize.y,                    densityDpi,                    DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR,                    imageReader.getSurface(),                    null,                    //传null表示在回调在主线程中执行                    null);            //在获取Image的时候，得先暂停1秒左右，不然就会获取失败(原因未知)            SystemClock.sleep(1000);            Image image = imageReader.acquireLatestImage();            Bitmap bitmap = BitmapUtil.fromImage(image);            image.close();            callback.invoke(bitmap);            virtualDisplay.release();        });    }    /*     Android 在5.0 之后支持了实时录屏的功能。     通过实时录屏我们可以拿到截屏的图像。     同时可以通过在Service中处理实现后台的录屏。     */    @RequiresApi(Build.VERSION_CODES.O)    public static void getViewBySystem(Activity activity, View view, Callback callback) {        int width = view.getWidth();        int height = view.getHeight();        //这里只能用8888，不能用其它的，否则一片黑取不到图像        Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888, true);        Window window = activity.getWindow();        final int[] location = new int[2];        view.getLocationInWindow(location);        Rect rect = new Rect(location[0], location[1], location[0] + view.getWidth(), location[1] + view.getHeight());        final Handler handler = new Handler(Looper.getMainLooper());        PixelCopy.request(window, rect, bitmap, copyResult -> {            callback.invoke(copyResult == PixelCopy.SUCCESS ? bitmap : null);        }, handler);    }    /**     * 截取视图     */    public static Bitmap getView(View view) {        view.setDrawingCacheEnabled(true);        view.buildDrawingCache();        Bitmap cache = view.getDrawingCache();        Bitmap bitmap = BitmapUtil.clone(cache);        view.setDrawingCacheEnabled(false);        view.destroyDrawingCache();        return bitmap;    }    /**     * 截取 ScrollView 视图     */    public static Bitmap getRecyclerView(RecyclerView recyclerView, int maxSize) {        RecyclerView.Adapter adapter = recyclerView.getAdapter();        int height = 0;        //取列表项和缓存项中的最小值        int size = Math.min(maxSize, adapter.getItemCount());        //把每个item的绘图缓存存储在LruCache中        LruCache bitmapCache = new LruCache<>(maxSize);        for (int i = 0; i < size; i++) {            //手动调用创建和绑定ViewHolder方法，            RecyclerView.ViewHolder holder = adapter.createViewHolder(recyclerView, adapter.getItemViewType(i));            adapter.onBindViewHolder(holder, i);            /*            测量            MeasureSpec.EXACTLY - 视图应该是这么多像素，无论它实际上有多大。            MeasureSpec.AT_MOST - 如果视图的尺寸较小，则视图可以是此尺寸或更小。            MeasureSpec.UNSPECIFIED - 视图可以是它需要的任何大小，以显示它需要显示的内容。             */            holder.itemView.measure(                    View.MeasureSpec.makeMeasureSpec(recyclerView.getWidth(), View.MeasureSpec.EXACTLY),                    View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));            //布局            holder.itemView.layout(0, 0,                    holder.itemView.getMeasuredWidth(),                    holder.itemView.getMeasuredHeight());            //开启视图绘制缓存            holder.itemView.setDrawingCacheEnabled(true);            holder.itemView.buildDrawingCache();            Bitmap drawingCache = holder.itemView.getDrawingCache();            Bitmap cacheClone = BitmapUtil.clone(drawingCache);            if (cacheClone != null) {                bitmapCache.put(i, cacheClone);            }            //禁用视图绘制缓存            holder.itemView.setDrawingCacheEnabled(false);            //销毁视图绘制缓存            holder.itemView.destroyDrawingCache();            //获取itemView的实际高度并累加//            height += holder.itemView.getMeasuredHeight();            height += cacheClone.getHeight();        }        //这里只能用8888，不能用其它的，否则一片黑取不到图像        Bitmap dstBitmap = Bitmap.createBitmap(recyclerView.getWidth(), height, Bitmap.Config.ARGB_8888);        Canvas canvas = new Canvas(dstBitmap);        Paint paint = new Paint();        for (int i = 0, top = 0; i < size; i++) {            Bitmap bitmap = bitmapCache.get(i);            canvas.drawBitmap(bitmap, 0, top, paint);            top += bitmap.getHeight();        }        return dstBitmap;    }    /**     * 截取 ScrollView 视图     */    public static Bitmap getScrollView(ScrollView scrollView) {        int height = 0;        //ScrollView理论上只有一个子View        for (int i = 0; i < scrollView.getChildCount(); i++) {            height += scrollView.getChildAt(i).getHeight();        }        //这里只能用8888，不能用其它的，否则一片黑取不到图像        Bitmap bitmap = Bitmap.createBitmap(scrollView.getWidth(), height, Bitmap.Config.ARGB_8888);        Canvas canvas = new Canvas(bitmap);        scrollView.draw(canvas);        return bitmap;    }}

public interface Callback {    void invoke() {}}

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