android - IntentService 在某些情况下无法运行

Question

我遇到了一个问题。 IntentService UpdateService02 偶尔会运行失败。我放入了日志条目以便进行调试，这就是我得到的...

02-28 21:37:32.461: Main - Broadcast Sent

02-28 21:37:32.484: BroadcastReceiver - Main Started; Set Alarm

02-28 21:37:32.539: BroadcastReceiver - Received AlarmService

02-28 21:38:32.500: BroadcastReceiver - Received AlarmService

通常这应该发生:

02-28 21:37:32.461: Main - Broadcast Sent

02-28 21:37:32.484: BroadcastReceiver - Main Started; Set Alarm

02-28 21:37:32.539: BroadcastReceiver - Received AlarmService

02-28 21:38:32.500: UpdateService -- onHandleIntent()

有什么想法吗？这是我的广播接收器代码...

广播接收器:

public class AlarmReceiver extends BroadcastReceiver {

    private static final int INTERVAL = 60*1000; // check every 60 seconds

    @Override
    public void onReceive(Context context, Intent intent) {
        if(intent.getAction() != null) {
            if (intent.getAction().equals(Intent.ACTION_BOOT_COMPLETED)) {
                Log.v(TAG, "BroadcastReceiver - Received Boot Completed; Set Alarm");
            
                setRecurringAlarm(context);
            }else if(intent.getAction().equalsIgnoreCase(Main.BROADCAST_STARTUP)){
                Log.v(TAG, "BroadcastReceiver - Main Started; Set Alarm");
            
                setRecurringAlarm(context);
            }else{
                Log.v(TAG, "BroadcastReceiver - Received " + intent.getAction());
            }
        }else{
            Log.v(TAG, "BroadcastReceiver - Received AlarmService");
        
            Intent i = new Intent(context, UpdateService02.class);
            context.startService(i);
        }
    }

    private void setRecurringAlarm(Context context) {
        Intent receiver = new Intent(context, AlarmReceiver.class);
        PendingIntent recurringDownload = PendingIntent.getBroadcast(context, 0, receiver, PendingIntent.FLAG_CANCEL_CURRENT);
        AlarmManager alarms = (AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
        alarms.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), INTERVAL, recurringDownload);
    }
}

Intent 服务:

public class UpdateService02 extends IntentService {

    static DefaultHttpClient mClient = Client.getClient();
    private static final int LIST_UPDATE_NOTIFICATION = 100;

    public UpdateService02() {
        super("UpdateService02");
    }

    @Override
    protected void onHandleIntent(Intent intent) {
        Log.v(TAG, "UpdateService -- onHandleIntent()");
    
        try {
            HttpGet httpget = new HttpGet(url);
            HttpResponse response;
            response = mClient.execute(httpget);
            BufferedReader in = new BufferedReader (new InputStreamReader(response.getEntity().getContent()));
        
            Intent i = new Intent(BROADCAST_UPDATE);  
            i.putExtra("text", in.readLine().toString() + " updated");
            sendBroadcast(i);
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

我认为我可能需要将 intentservice 启动的上下文设置为应用程序，但老实说我不知道​​。

Answer 1

我想通了问题...

我改变了这个:

try {
    HttpGet httpget = new HttpGet(url);
    HttpResponse response;
    response = mClient.execute(httpget);
    BufferedReader in = new BufferedReader (new InputStreamReader(response.getEntity().getContent()));

    Intent i = new Intent(BROADCAST_UPDATE);  
    i.putExtra("text", in.readLine().toString() + " updated");
    sendBroadcast(i);
} catch (ClientProtocolException e) {

为此:

try {
    HttpGet httpget = new HttpGet(url);
    HttpResponse response;
    response = mClient.execute(httpget);
    BufferedReader in = new BufferedReader (new InputStreamReader(response.getEntity().getContent()));

    Intent i = new Intent(BROADCAST_UPDATE);  
    i.putExtra("text", in.readLine().toString() + " updated");
    sendBroadcast(i);
    in.close();
} catch (ClientProtocolException e) {

有时读取器会“卡住”，下次调用它时仍会卡住，尝试处理上一个请求。添加 in.close(); 确保我在每次使用后关闭它。现在效果很好。