From a Service I am trying to start another IntentService but it is giving me an error when trying to pass in a new ResultReceiver with a new Handler as the parameter.
在一个服务中，我正在尝试启动另一个IntentService，但是当试图以新的处理程序作为参数传入一个新的ResultReceiver时，它会给我一个错误。
Can't figure out why it is giving me this error. Please help!
我不明白为什么它会给我这个错误。请帮助!
Line 797 in SocketIOService which the error has occurred is:
发生错误的SocketIOService中第797行是:
downloadIntent.putExtra(DownloadService.KEY_RECEIVER, new DownloadReceiver(new Handler()));
StackTrace Error
加误差
06-05 19:51:10.417: E/AndroidRuntime(7716): FATAL EXCEPTION: Thread-6358
06-05 19:51:10.417: E/AndroidRuntime(7716): java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
06-05 19:51:10.417: E/AndroidRuntime(7716): at android.os.Handler.<init>(Handler.java:121)
06-05 19:51:10.417: E/AndroidRuntime(7716): at com.walintukai.lfdate.SocketIOService$9.run(SocketIOService.java:797)
06-05 19:51:10.417: E/AndroidRuntime(7716): at java.lang.Thread.run(Thread.java:856)
Code starting IntentService
代码开始IntentService
new Thread(new Runnable() {
public void run() {
try {
JSONArray array = json.getJSONArray(0);
if (array.length() > 0) {
ArrayList<String> coverPhotos = new ArrayList<String>();
for (int i = 0; i < array.length(); i++) {
String id = array.getJSONObject(i).getString(KEY_ID);
String name = array.getJSONObject(i).getString(KEY_NAME);
String genre = array.getJSONObject(i).getString(KEY_GENRE);
String platform = "";
JSONArray platformArray = array.getJSONObject(i).getJSONArray(KEY_PLATFORM);
for (int p = 0; p < platformArray.length(); p++) {
if (p == 0) { platform = platformArray.getString(p); }
else { platform = platform + ", " + platformArray.getString(p); }
}
String coverPhoto = "";
JSONArray coverPhotoArray = array.getJSONObject(i).getJSONArray(KEY_COVER_PHOTO);
for (int c = 0; c < coverPhotoArray.length(); c++) {
if (c == 0) { coverPhoto = coverPhotoArray.getString(c); }
else { coverPhoto = coverPhoto + ", " + coverPhotoArray.getString(c); }
}
Game game = new Game(id, name, genre, platform, coverPhoto);
if (!db.doesGameExist(id)) { db.createGame(game); }
else { db.updateGame(game); }
coverPhotos.add(coverPhoto);
}
Intent downloadIntent = new Intent(SocketIOService.this, DownloadService.class);
downloadIntent.putStringArrayListExtra(DownloadService.KEY_COVER_PHOTOS, coverPhotos);
downloadIntent.putExtra(DownloadService.KEY_RECEIVER, new DownloadReceiver(new Handler()));
startService(downloadIntent);
}
}
catch (JSONException e) { e.printStackTrace(); }
}
}).start();
ResultReceiver Code
ResultReceiver代码
private class DownloadReceiver extends ResultReceiver {
public DownloadReceiver(Handler handler) {
super(handler);
}
@Override
protected void onReceiveResult(int resultCode, Bundle resultData) {
super.onReceiveResult(resultCode, resultData);
if (resultCode == DownloadService.RESULT_FINISHED) {
Log.i("GAME COVER DOWNLOADS", "COMPLETE");
if (mOnServiceListener != null) {
mOnServiceListener.onGameListUpdated();
}
}
}
}
IntentService Code
IntentService代码
public class DownloadService extends IntentService {
public static final String KEY_COVER_PHOTOS = "coverPhotos";
public static final String KEY_RECEIVER = "receiver";
public static final int RESULT_FINISHED = 1000;
private static final String URL_GAME_COVER = "https://test.com/images/game_cover/";
public DownloadService(String name) {
super(name);
}
@Override
protected void onHandleIntent(Intent intent) {
ArrayList<String> coverPhotos = intent.getStringArrayListExtra(KEY_COVER_PHOTOS);
ResultReceiver receiver = (ResultReceiver) intent.getParcelableExtra(KEY_RECEIVER);
for (String coverPhoto : coverPhotos) {
// TODO: implement code to handle multiple photos
try {
URL url = new URL(URL_GAME_COVER + coverPhoto);
URLConnection connection = url.openConnection();
connection.connect();
// This will be useful so that you can show a typical 0-100% progress bar
int fileLength = connection.getContentLength();
// Download the file
InputStream input = new BufferedInputStream(url.openStream());
String filepath = this.getExternalFilesDir(Environment.DIRECTORY_PICTURES).toString() + "/" + coverPhoto;
OutputStream output = new FileOutputStream(filepath);
byte data[] = new byte[1024];
long total = 0;
int count;
while ((count = input.read(data)) != -1) {
total += count;
output.write(data, 0, count);
}
output.flush();
output.close();
input.close();
}
catch (IOException e) { e.printStackTrace(); }
}
receiver.send(RESULT_FINISHED, null);
}
}
}
1 个解决方案
#1
2
What type is your SocketIOService ? Is it really a Service or not?
你们的服务是什么类型的?这真的是一种服务吗?
If you create a Handler in a common thread which is not an Activity or Service,you should call Looper.prepare();first ,then a message bus is started in the thread and the handler works well.Or you will got the exception because general thread do not have the message bus(just a infinite loop in which the messages are consumed).
如果您在公共线程中创建的处理程序不是活动或服务，您应该调用Looper.prepare();首先，在线程中启动消息总线，处理程序运行良好。或者您会遇到异常，因为通用线程没有消息总线(只是使用消息的无限循环)。
EDIT: Oh,your handler is not in your Service,but in the sub-thread(in your new Thread(xxx).start),so this is a general thread which do not have a message bus.I think you should initalize your handler outside and then use it which is a handler of a Service.
编辑:哦，您的处理程序不在您的服务中，而是在子线程中(在您的新线程中(xxx .start))，因此这是一个没有消息总线的通用线程。我认为你应该将你的处理器嵌入到外部，然后使用它，它是一个服务的处理器。
#1
2
What type is your SocketIOService ? Is it really a Service or not?
你们的服务是什么类型的?这真的是一种服务吗?
If you create a Handler in a common thread which is not an Activity or Service,you should call Looper.prepare();first ,then a message bus is started in the thread and the handler works well.Or you will got the exception because general thread do not have the message bus(just a infinite loop in which the messages are consumed).
如果您在公共线程中创建的处理程序不是活动或服务，您应该调用Looper.prepare();首先，在线程中启动消息总线，处理程序运行良好。或者您会遇到异常，因为通用线程没有消息总线(只是使用消息的无限循环)。
EDIT: Oh,your handler is not in your Service,but in the sub-thread(in your new Thread(xxx).start),so this is a general thread which do not have a message bus.I think you should initalize your handler outside and then use it which is a handler of a Service.
编辑:哦，您的处理程序不在您的服务中，而是在子线程中(在您的新线程中(xxx .start))，因此这是一个没有消息总线的通用线程。我认为你应该将你的处理器嵌入到外部，然后使用它，它是一个服务的处理器。