添加SD卡写权限

方法

public void saveMyBitmap(String bitName, Bitmap mBitmap) {

    File f = new File("/sdcard/" + bitName + ".png");

    try {

        f.createNewFile();

    } catch (IOException e) {

        // TODO Auto-generated catch block

        DebugMessage.put("在保存图片时出错：" + e.toString());

    }

    FileOutputStream fOut = null;

    try {

        fOut = new FileOutputStream(f);

    } catch (FileNotFoundException e) {

        e.printStackTrace();

    }

    mBitmap.compress(Bitmap.CompressFormat.PNG, 100, fOut);

    try {

        fOut.flush();

    } catch (IOException e) {

        e.printStackTrace();

    }

    try {

        fOut.close();

    } catch (IOException e) {

        e.printStackTrace();

    }

}