当我的应用开始BroadcastReceiver使用. 因为我只想在从我的应用程序开始下载时捕获，所以我使用了.ACTION_DOWNLOAD_COMPLETEDownloadManagerACTION_DOWNLOAD_COMPLETELocalBroadcastManager
但onReceiver根本没有被调用。DownloadManagerapp 显示下载完成但未onReceive触发。当我使用registerReceiver它时，它按预期工作。但这会让应用程序得到通知，即使下载是由其他应用程序开始的。所以 LocalBroadcastManager 是需要的。
主要活动
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
downloadReceiver = new DownloadReceiver();
LocalBroadcastManager.getInstance(this).registerReceiver(downloadReceiver, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));
downloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
if(FileHelper.isStorageAvailable()) {
DownloadManager.Request request = new DownloadManager.Request(Uri.parse("http://example.com/image.jpg"));
downloadManager.enqueue(request);
}
}
@Override
protected void onPause() {
LocalBroadcastManager.getInstance(this).unregisterReceiver(downloadReceiver);
super.onPause();
}
下载接收器
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (DownloadManager.ACTION_DOWNLOAD_COMPLETE.equals(action)) {
long downloadId = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, 0);
downloadManager = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);
DownloadManager.Query query = new DownloadManager.Query();
query.setFilterById(downloadId);
Cursor c = downloadManager.query(query);
if (c.moveToFirst()) {
int columnIndex = c.getColumnIndex(DownloadManager.COLUMN_STATUS);
if (DownloadManager.STATUS_SUCCESSFUL == c.getInt(columnIndex)) {
String title = c.getString(c.getColumnIndex(DownloadManager.COLUMN_TITLE));
Toast.makeText(context, title, Toast.LENGTH_SHORT).show();
}
}
}
}
它根本不onRecieve应该调用。指出我在这里做错了什么。现在被困在这里很长时间了。我无法使用registerReceiver，因为只有在我的应用开始下载时才需要跟踪下载完成操作。