view存成bitmap

    public static String saveView2Bitmap(Context context,View view,String fileName) {
        Bitmap bitmap = null;
        if(context == null || view == null || TextUtils.isEmpty(fileName)){
            return null;
        }
        view.setDrawingCacheEnabled(true);
//        view.measure(View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED), View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
        view.buildDrawingCache();
        bitmap = view.getDrawingCache();
        if(bitmap == null){
            Toast.makeText(context,context.getString(R.string.wallpaper_failed_to_crop),Toast.LENGTH_SHORT).show();
            return null;
        }
        String ret = null;
        OutputStream fos = null;
        try {
            Bitmap resizeBitmap = zoomBitmap(bitmap,0.5f,0.5f);
            bitmap.recycle();
            Uri uri =  Uri.fromFile(new File(WallpaperSettingUtils.getTempSaveDir() + fileName));
            File file = new File(uri.getPath());
            if (!file.exists()) {
                try {
                    file.createNewFile();
                } catch (IOException e) {
                    Toast.makeText(context,context.getString(R.string.wallpaper_failed_to_crop),Toast.LENGTH_SHORT).show();
                    return null;
                }
            }
            fos = context.getContentResolver().openOutputStream(uri);
            // 这里也可以是 Bitmap.CompressFormat.PNG, 可以保持透明背景
            resizeBitmap.compress(Bitmap.CompressFormat.JPEG, 80, fos);
            ret = WallpaperSettingUtils.getTempSaveDir() + fileName;
        } catch (Exception e) {
            Toast.makeText(context,context.getString(R.string.wallpaper_failed_to_crop),Toast.LENGTH_SHORT).show();
        }finally {
            Util.closeSilently(fos);
            view.setDrawingCacheEnabled(false);
        }
        return ret;
    }
    /**
     * 将图片按指定比例缩放
     */
    public static Bitmap zoomBitmap(Bitmap bitmap, float scaleWidth, float scaleHeight) {
        int width = bitmap.getWidth();
        int height = bitmap.getHeight();
        Matrix matrix = new Matrix();
//        float scaleWidth = ((float) w / width);
//        float scaleHeight = ((float) h / height);
        matrix.postScale(scaleWidth, scaleHeight);
        Bitmap newBitmap = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);
        return newBitmap;
    }
    public static Bitmap convertViewToBitmap(View view){
        view.measure(View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED), View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
        view.buildDrawingCache();
        Bitmap bitmap = view.getDrawingCache();
        return bitmap;
    }
//---------------------
    public static String saveView2BitmapWithoutZoom(Context context,View view,String fileName) {
        Bitmap bitmap = null;
        if(context == null || view == null || TextUtils.isEmpty(fileName)){
            return null;
        }
        view.setDrawingCacheEnabled(true);
        view.buildDrawingCache();
        bitmap = view.getDrawingCache();
        if(bitmap == null){
            Toast.makeText(context,context.getString(R.string.wallpaper_failed_to_crop),Toast.LENGTH_SHORT).show();
            return null;
        }
        String ret = null;
        OutputStream fos = null;
        try {
            Uri uri =  Uri.fromFile(new File(WallpaperSettingUtils.getTempSaveDir() + fileName));
            File file = new File(uri.getPath());
            if (!file.exists()) {
                try {
                    file.createNewFile();
                } catch (IOException e) {
                    Toast.makeText(context,context.getString(R.string.wallpaper_failed_to_crop),Toast.LENGTH_SHORT).show();
                    return null;
                }
            }
            fos = context.getContentResolver().openOutputStream(uri);
            bitmap.compress(Bitmap.CompressFormat.PNG, 100, fos);
            ret = WallpaperSettingUtils.getTempSaveDir() + fileName;
        } catch (Exception e) {
            Toast.makeText(context,context.getString(R.string.wallpaper_failed_to_crop),Toast.LENGTH_SHORT).show();
        }finally {
            Util.closeSilently(fos);
            view.destroyDrawingCache();
            view.setDrawingCacheEnabled(false);
            bitmap.recycle();
        }
        return ret;
    }