Android4.4拒绝发送扫描SD卡的广播

作者:燕潇洒

导读:android保存图片到本地,需要发送广播扫描SD卡,在Android4.4时,Google提高了Intent.ACTION_MEDIA_MOUNTED的权限,所以在4.4以后使用这个ACTION会报错”Permission Denial: not allowed to send broadcast android.intent.action.MEDIA_MOUNTED from pid=2269, uid=20016”。因为因为Android4.4中限制了系统应用才有权限使用广播通知系统扫描SD卡

解决方案: 一.把上面的Intent.ACTION_MEDIA_MOUNTED,换成Intent.ACTION_MEDIA_SCANNER_SCAN_FILE,Uri可以是文件夹路径,也可以文件路径.

//扫描文件 context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://" + path))); //扫描文件夹 Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE); intent.setData(Uri.parse(Environment.getExternalStorageDirectory().getPath())); context.sendBroadcast(intent);

path为图片路径!

二.使用系统的MediaScannerConnection类扫描,可以为文件夹，也可以是文件:

//扫描文件夹 String[] paths = new String[]{Environment.getExternalStorageDirectory().getPath()}; MediaScannerConnection.scanFile(mContext, paths, null, null); //扫描文件 String[] paths = new String[]{path}; MediaScannerConnection.scanFile(context, paths, null, null);

小例子:

/** * 保存到sd卡 */ public File saveToSDCard() { String filePath = Environment.getExternalStorageDirectory().getPath(); System.out.println(filePath + "保存路径"); String path = filePath + "/" + String.valueOf(System.currentTimeMillis()) + ".png"; File file = new File(path); FileOutputStream fos = null; try { fos = new FileOutputStream(file); } catch (Exception e) { e.printStackTrace(); } mBitmap.compress(Bitmap.CompressFormat.PNG, 100, fos); //发送Sd卡的就绪广播,要不然在手机图库中不存在 //第一种 Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE); intent.setData(Uri.parse(Environment.getExternalStorageDirectory().getPath())); context.sendBroadcast(intent); //第二种 String[] paths = new String[]{path}; MediaScannerConnection.scanFile(context, paths, null, null); Log.e("TAG", "图片已保存"); }