如何检测是否运行在Android上的新的媒体文件扫描(背景) [英] how to detect if is running the scan for new media files on Android (in background)
问题描述
我有两个活动:主要与处理。
在处理活动做一个编辑操作的文件夹中文件名,然后开始扫描通过广播进行更新,而我检查时,扫描完成。
I have two activity: Main and Processing. in the Processing activity do an edit operation on the file names in a folder, and then start a scan to update via broadcast, and I check when the scan finish.
//end batch renaming operation
//start updating media store library
sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED,Uri.parse("file://"+Environment.getExternalStorageDirectory())));
//show toast "updating"
op_media_mounted.show();
//catch when updaitng op ends
IntentFilter filter = new IntentFilter(Intent.ACTION_MEDIA_SCANNER_FINISHED);
filter.addDataScheme("file");
BroadcastReceiver mReceiver = (new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals(Intent.ACTION_MEDIA_SCANNER_FINISHED)) {
Toast.makeText(frm_elabora.this, "Scan complete.", Toast.LENGTH_SHORT).show();
}
}
});
registerReceiver(mReceiver, filter);
我想如果扫描正在运行传递活动prevent处理。
我可以首先检查,如果扫描未运行,则启动第二处理活动?不过的了。
I would like to pass the Activity prevent processing if the scan is running. I can check first if the scan is not running, then launch the second processing activity? as this.
Button btnstart = (Button)findViewById(R.id.btn_start);
btnstart.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
if ( there_isnt_scan_for_new_media_file )
startActivity(intent_processing);
else{
wait_until_ACTION_MEDIA_SCANNER_FINISHED
startActivity(intent_processing);
}
我需要检查这一点,因为如果我重命名文件而Android运行扫描,当我在处理活动编辑文件,在最后我找到大小为0字节的文件夹中的其他文件,如变更前。
所以我必须等待该扫描完成。我无法找到一个解决方案。
I need to check this, because if i rename the files while android running a scan, when I edit the files in the processing activity, in the end I find other files in the folder with size 0 bytes, as before the change. so I have to wait that the scan finish. i can't find a solution.
更新:
我已经发现这个
UPDATES: i've found this
public static Uri getMediaScannerUri ()
Since: API Level 1
Uri for querying the state of the media scanner.
我尝试这个
//send broadcast
sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED,
Uri.parse("file://" +
Environment.getExternalStorageDirectory())));
//show media scanner state
Toast.makeText(frm_elabora.this,
MediaStore.getMediaScannerUri().toString(),
Toast.LENGTH_SHORT).show();
和我得到的内容://媒体/无/ media_scanner永远......如果我问getMediaScannerUri()后,
发送ACTION_MEDIA_MOUNTED,我应该得到的东西不同的内容://媒体/无/ media_scanner???
and i get "content://media/none/media_scanner" always... if i ask getMediaScannerUri() after sent ACTION_MEDIA_MOUNTED, i should get something different from "content://media/none/media_scanner" ???
推荐答案
你尝试的 MEDIA_SCANNER_VOLUME
通常当媒体扫描仪正在运行此列不为null。
Usually when the media scanner is running this column is not null.
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