Question

这是我的第一个Android程序。我有一个活动可以读取信息，一个收听短信和服务的接收器，以便让应用程序在后台运行。

我的主要活动有一个切换按钮。启用时，它会启动服务，该服务会创建通知以防止应用程序被杀死。用户还可以单击通知以返回主活动：

package com.rockmanx77777.SMSbyVoice;
import android.app.Notification;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Intent;
import android.graphics.BitmapFactory;
import android.os.Binder;
import android.os.IBinder;
import android.support.v4.app.NotificationCompat;
import android.util.Log;

public class SMSService extends Service{

    @Override
    public void onCreate() {
        createNotification();
        super.onCreate();
    }

    public class MyBinder extends Binder {
        SMSService getService() {
            return SMSService.this;
        }
    }

    private final IBinder binder = new MyBinder();

    @Override
    public IBinder onBind(Intent intent) {
        return binder;
    }

    private void createNotification(){

        final int NOTIFICATION_ID = 77777;
        Intent intent = new Intent(this, SMSByVoice.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        intent.putExtra("senderNumber", "");
        intent.setAction("com.rockmanx77777.SMSByVoice.PROCESS");
        PendingIntent pi = PendingIntent.getActivity(this, 1, intent, 0);
        NotificationCompat.Builder builder = new NotificationCompat.Builder(this);

        builder.setContentTitle("Sample Title");
        builder.setContentText("Sample Text");
        builder.setSmallIcon(R.drawable.ic_launcher);
        builder.setLargeIcon(BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher));
        builder.setContentIntent(pi);

        Notification notification = builder.getNotification();
        notification.flags = notification.flags | Notification.FLAG_ONGOING_EVENT;

        startForeground(NOTIFICATION_ID, notification);
    }
}

当有传入的短信时，正确调用服务的onReceive。一切都被执行，包括context.startActivity(localSMS);我在这里遇到了问题：

package com.rockmanx77777.SMSbyVoice;
import java.util.Set;
import android.annotation.TargetApi;
import android.app.ActivityManager;
import android.app.IntentService;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.support.v4.content.LocalBroadcastManager;
import android.telephony.SmsMessage;
import android.util.Log;

public class SMSReceiver extends BroadcastReceiver{

    public SMSReceiver(){
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        Log.d("MSG", "Receiver's onReceived Called");
        if(intent.getAction() == "android.provider.Telephony.SMS_RECEIVED"){
            //Get the SMS message passed in
            Bundle bundle = intent.getExtras();        
            SmsMessage[] msgs = null;
            String senderNumber = "";
            String body = "";
            if (bundle != null){
                //Retrieve the SMS message received
                Object[] pdus = (Object[]) bundle.get("pdus");
                msgs = new SmsMessage[pdus.length];            
                for (int i=0; i<msgs.length; i++){
                    msgs[i] = SmsMessage.createFromPdu((byte[])pdus[i]);  
                    body = msgs[i].getMessageBody().toString();    
                }
                senderNumber = msgs[0].getOriginatingAddress();

                Intent localSMS = new Intent(context, SMSByVoice.class);
                localSMS.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                localSMS.setAction("rockmanx77777.SMSByVoice.RETURN");
                localSMS.putExtra("senderNumber", senderNumber);
                localSMS.putExtra("body", body);
                Log.d("MSG", "Starting activity from Receiver");
                context.startActivity(localSMS);
            }
        }
        else{
            Log.d("MSG", "intent.getAction() != android.provider.Telephony.SMS_RECEIVED");
        }
    }
}

如果活动在前台运行，一切都很好。如果活动在后台运行（创建服务和通知），则context.startActivity(localSMS);将在SMS到达时执行，但不会调用活动的onNewIntent()方法，也不会将活动带到前台。

如果我在执行context.startActivity(localSMS);后的某个时间手动点击通知，那么活动将到达前台（按预期方式），然后执行onNewIntent()。

我想要发生的是，如果活动在后台运行（服务和通知创建），那么在短信到达时，我的接收器会将活动带到前台（通过startActivity(localSMS);），以及在此之后，活动将调用其onNewIntent()方法。

我不知道出了什么问题。我认为服务和接收器是相互冲突的，但我可以完全关闭。对不起，这么久了。我通常可以在这里找到问题的答案，但对于这个问题，我没有运气。任何帮助是极大的赞赏！

Answer 1

我弄明白了什么。我的服务中没有接收器：我的服务类已更改为：

public class SMSService extends Service{

    SMSReceiver receiver = new SMSReceiver();

    @Override
    public void onCreate() {
        Log.d("MSG", "SMSService OnCreate Started");

        createNotification();
        this.registerReceiver(receiver, new IntentFilter("android.provider.Telephony.SMS_RECEIVED"));
        super.onCreate();
        Log.d("MSG", "SMSService OnCreate Ended");
    }

    public class MyBinder extends Binder {...

Android：活动不从后台执行onNewIntent（）（从服务调用）

1 个答案: