public final class FileUtil {

    private static final String SD_PATH = "/sdcard/player/pic/";
    private static final String IN_PATH = "/player/pic/";

    /**
     * 隨機生產檔名
     *
     * @return
     */
    private static String generateFileName() {
        return UUID.randomUUID().toString();
    }

    /**
     * 儲存bitmap到本地
     *
     * @param mBitmap
     * @return
     */
    public static String saveBitmap(Bitmap mBitmap) {
        String savePath;
        File filePic;
        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
            savePath = SD_PATH;
        } else {
            savePath = AppUtil.getApplicationContext().getFilesDir().getAbsolutePath() + IN_PATH;
        }
        try {
            filePic = new File(savePath + generateFileName() + ".jpg");
            if (!filePic.exists()) {
                filePic.getParentFile().mkdirs();
                filePic.createNewFile();
            }
            FileOutputStream fos = new FileOutputStream(filePic);
            mBitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);
            fos.flush();
            fos.close();
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }
        return filePic.getAbsolutePath();
    }
}