检查下载管理器是否下载了文件 [英] Check if Download Manager downloaded the file
问题描述
如何检查文件是否已下载并运行其安装?我有一个代码:
How can I check if 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);
}
推荐答案
要检查下载管理器是否下载了文件,必须实现BroatcastReceiver.
To check whether the download manager downloaded the file, you must implements your BroatcastReceiver.
@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.
}
}
}
}
}
但是,我不确定您是否可以通过编程方式安装APK.出于安全原因,我认为您不能.对于应用程序更新,我认为您应该使用Google版本控制.当您使用其他版本号重新部署您的应用程序时,用户应能够自动更新(除非用户在Google Play上关闭).希望这会有所帮助.
However, I am not sure whether you can install the APK programmatically. For security reason, I don't think you can. For application update, I think you should use google versioning control. When you re-deploy your app using different version number, the users should able to update automatically (unless user turn off at google play). Hope that this will help.
更新
您不需要调用我提到的方法.您只需要在清单xml文件中声明广播接收器,下载完成后,DownloadManager将在调用.xml如下所示:
You do not need to call the method that I mention. You just need to declare your broadcast receiver at your manifest xml file and DownloadManager will call at when download complete. The xml look something like below:
<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>
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