Java – check that the download manager has downloaded the file

How do I check if a file has been downloaded and run its installation? I have a code:

public void downloadUpdate(String url){

    DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
    request.setDescription("Downloading...");
    request.setTitle("App Update");
    request.allowScanningByMediaScanner();
    request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);

    String name = URLUtil.guessFileName(url,null,MimeTypeMap.getFileExtensionFromUrl(url));

    request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS,name);

    DownloadManager manager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
    manager.enqueue(request);
}

Solution

To check whether the download manager has downloaded the file, you must implement broadcastreceiver

@Override
public void onReceive(Context context,Intent intent) {
    String action = intent.getAction();
    if (action.equals(DownloadManager.ACTION_DOWNLOAD_COMPLETE)) {
        DownloadManager.Query query = new DownloadManager.Query();
        query.setFilterById(intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID,0));
        DownloadManager manager = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);
        Cursor cursor = manager.query(query);
        if (cursor.moveToFirst()) {
            if (cursor.getCount() > 0) {
                int status = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_STATUS));
                if (status == DownloadManager.STATUS_SUCCESSFUL) {
                    String file = cursor.getString(cursor.getColumnIndex(DownloadManager.COLUMN_LOCAL_FILENAME));
                    // So something here on success
                } else {
                    int message = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_REASON));
                    // So something here on Failed.
                }
            }
        }
    }
}

However, I'm not sure if you can install APK programmatically For security reasons, I don't think you can For application updates, I think you should use Google version control When you redeploy the application with a different version number, the user should be able to update automatically (unless the user closes it on Google play) I hope this will help

to update

You don't need to call the method I mentioned You only need to declare the broadcast receiver in the manifest XML file, and the downloadmanager will be called when the download is complete The XML looks like this:

<receiver
        android:name=".BroadcastReceiver"
        android:enabled="true"
        android:exported="true" >
        <intent-filter>
            <action android:name="android.intent.action.DOWNLOAD_COMPLETE" />
            <action android:name="android.intent.action.DOWNLOAD_NOTIFICATION_CLICKED" />
        </intent-filter>
    </receiver>