Question

我正在使用sendBroadcast进行媒体文件扫描。然后我需要等到sendBroadcast完成后再完成。我如何在Android中执行此操作？

我知道我可以在这里使用简单的逻辑，但我正在寻找更好的方法

context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://" + Environment.getExternalStorageDirectory())));

// wait here till till do something completed

接收机

private BroadcastReceiver mediaScanner = new BroadcastReceiver(){

        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
                if (action.equals(Intent.ACTION_MEDIA_SCANNER_FINISHED)) {
                  // Do some thing here. 
                }
    }
}

Answer 1

您可以在Java中查找Observable pattern，它符合您的意愿

Answer 2

以下是检查媒体扫描程序是否正在运行的代码。

public static final boolean isMediaScannerScanning(final ContentResolver cr) {
    boolean result = false;
    final Cursor cursor = query(cr, MediaStore.getMediaScannerUri(), new String[] { MediaStore.MEDIA_SCANNER_VOLUME }, null,
            null, null);
    if (cursor != null) {
        if (cursor.getCount() == 1) {
            cursor.moveToFirst();
            result = "external".equals(cursor.getString(0));
        }
        cursor.close();
    }
    return result;
}

我在这里发布了答案 http://androidbridge.blogspot.com/2012/06/how-to-check-whether-android-media.html

如何等待sendBroadcast完成

2 个答案: