Android 将View視圖生成Bitmap

例如:将NestedScrollView視圖（繼承ViewGroup類）生成Bitmap

private Bitmap getBitmapByView(NestedScrollView scrollView) {
        int h = 0;
        Bitmap bitmap = null;
        // 擷取scrollview實際高度
        for (int i = 0; i < scrollView.getChildCount(); i++) {
            h += scrollView.getChildAt(i).getHeight();//擷取scrollView的螢幕高度
            scrollView.getChildAt(i).setBackgroundColor(
                    Color.parseColor("#ffffff"));
        }
        // 建立對應大小的bitmap
        bitmap = Bitmap.createBitmap(scrollView.getWidth(), h,
                Bitmap.Config.RGB_565);
        final Canvas canvas = new Canvas(bitmap);//把建立的bitmap放到畫布中去
        scrollView.draw(canvas);//繪制canvas 畫布
        return bitmap;
    }
           

儲存圖檔

public void savePicture(Bitmap bm, String fileName) {
        LogUtils.d("正在生成檔案.........");
        String path = Environment.getExternalStorageDirectory().getAbsolutePath() + "/inform";
        File file = new File(path);
        if (FileUtils.isFileExists(file)) {
            FileUtils.delete(file);
            file.mkdirs();
        } else {
            // 建立檔案夾
            file.mkdirs();
        }

        File myCaptureFile = new File(path + "/" + fileName);
        LogUtils.d("myCaptureFile", myCaptureFile.getAbsoluteFile());
        if (FileUtils.isFileExists(myCaptureFile)) {
            // 删除已存在的檔案 
            FileUtils.delete(myCaptureFile);
        }
        try {
            myCaptureFile.createNewFile();
            //重新建立檔案
            LogUtils.d("CaptureFileName", myCaptureFile.getAbsoluteFile());
            BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(myCaptureFile));
            //壓縮儲存到本地
            bm.compress(Bitmap.CompressFormat.JPEG, 95, bos);
            bos.flush();
            bos.close();
            // -------------  擷取圖檔的寬高 -----------------
            int[] wh = ImageUtils.getSize(myCaptureFile);
            LogUtils.d("寬:" + wh[0], "高:" + wh[1]);
//            Toast.makeText(this, "儲存成功!", Toast.LENGTH_SHORT).show();
            LogUtils.d("儲存成功");
        } catch (Exception e) {
            LogUtils.e(e);
            Toast.makeText(this, "儲存失敗!", Toast.LENGTH_SHORT).show();
        }
    }