Bitmap對象轉文件

圖片路徑爲根目錄/a1/時間戳.jpg

 public File saveBitmap(Bitmap bitmapUse) {
        Log.e("wy", "開始保存");
        //生成一個文件，存儲我們將來拍照的照片
        String sdPath = Environment.getExternalStorageDirectory()
                .getAbsolutePath() + "/a1";
        File file = new File(sdPath);

        Log.e("wy","絕對文件路徑: "+ file.getAbsoluteFile());
        Log.e("wy","文件名: "+ file.getName());
        if (!file.exists()) {
            file.mkdirs();
            Log.e("wy", "創建文件夾,路徑："+file.getPath());
        }
        String mPath = System.currentTimeMillis() + "";
        Log.e("wy", "保存路徑: " + sdPath);
        File f = new File(sdPath, mPath + ".jpg");
//        File f = new File("/sdcard/namecard/", picName);
        if (f.exists()) {
            f.delete();
        }
        try {
            FileOutputStream out = new FileOutputStream(f);
//            10M
//            bitmapUse.compress(Bitmap.CompressFormat.PNG, 90, out);
//            0.5M
            bitmapUse.compress(Bitmap.CompressFormat.JPEG, 45, out);
            out.flush();
            out.close();
            Log.e("wy", "已經保存");
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return f;
    }