java - 非 Activity 类的Android通知

Question

我想从另一个类中调用MainActivity中的notify（）方法。这是我的方法：

public class MyAlarmService extends Service{
    @Override
    public IBinder onBind(Intent arg0)
    {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public void onCreate()
    {
        // TODO Auto-generated method stub
        super.onCreate();
    }

    @SuppressWarnings("static-access")
    @Override
    public void onStart(Intent intent, int startId)
    {
        super.onStart(intent, startId);

        String title = "title";
        String message = "message";

      new  MainActivity().Notify(title, message);
...

主要活动：

public class MainActivity extends Activity {
  NotificationManager manager;
    Notification myNotication;

  @Override

    protected void onCreate(Bundle savedInstanceState) {
        manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);

...
 public void Notify(String notificationTitle, String notificationMessage){
        Intent intent = new Intent("com.xxxx.app.MainActivity");

        PendingIntent pendingIntent = PendingIntent.getActivity(MainActivity.this, 1, intent, 0);

        Notification.Builder builder = new Notification.Builder(MainActivity.this);

        builder.setAutoCancel(false);
        builder.setTicker("this is ticker text");
        builder.setContentTitle("Notification");
        builder.setContentText("Text");
        builder.setSmallIcon(R.drawable.infoicon);
        builder.setContentIntent(pendingIntent);
        builder.setOngoing(true);
        builder.setSubText("This is subtext...");
        builder.setNumber(100);
        builder.build();
        myNotication = builder.getNotification();
        manager.notify(11, myNotication);
    }

...

但是我收到一条错误消息：

致命异常：主要
                                                                                                    流程：com.xxxx.app，PID：10311
                                                                                                    java.lang.RuntimeException：无法使用意图{cmp = com.xxxx.app / .MyAlarmService}启动服务com.xxxx.app.MyAlarmService@636e513：java.lang.NullPointerException：尝试调用虚拟方法'java.lang。空对象引用上的字符串android.content.Context.getPackageName（）'
                                                                                                        在android.app.ActivityThread.handleServiceArgs（ActivityThread.java:3027）
                                                                                                        在android.app.ActivityThread.-wrap17（ActivityThread.java）
                                                                                                        在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1442）
                                                                                                        在android.os.Handler.dispatchMessage（Handler.java:102）
                                                                                                        在android.os.Looper.loop（Looper.java:148）
                                                                                                        在android.app.ActivityThread.main（ActivityThread.java:5417）
                                                                                                        在java.lang.reflect.Method.invoke（本机方法）
                                                                                                        在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:726）
                                                                                                        在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:616）
                                                                                                     原因：java.lang.NullPointerException：尝试在空对象引用上调用虚拟方法'java.lang.String android.content.Context.getPackageName（）'
                                                                                                        在android.content.ContextWrapper.getPackageName（ContextWrapper.java:133）
                                                                                                        在android.app.PendingIntent.getActivity（PendingIntent.java:305）
                                                                                                        在android.app.PendingIntent.getActivity（PendingIntent.java:272）
                                                                                                        在com.xxxx.app.MainActivity.Notify（MainActivity.java:304）
                                                                                                        在com.xxxx.app.MyAlarmService.onStart（MyAlarmService.java:41）
                                                                                                        在android.app.Service.onStartCommand（Service.java:459）
                                                                                                        在android.app.ActivityThread.handleServiceArgs（ActivityThread.java:3010）
                                                                                                        在android.app.ActivityThread.-wrap17（ActivityThread.java）
                                                                                                        在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1442）
                                                                                                        在android.os.Handler.dispatchMessage（Handler.java:102）
                                                                                                        在android.os.Looper.loop（Looper.java:148）
                                                                                                        在android.app.ActivityThread.main（ActivityThread.java:5417）
                                                                                                        在java.lang.reflect.Method.invoke（本机方法）
                                                                                                        在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:726）
                                                                                                        在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:616）

Answer 1

您可以通过以下方式进行相同操作：

1）将那个Notify方法复制到服务中，并在需要顺序触发通知的任何地方调用它，Notification Service需要活动或服务的上下文）

2）您可以通过广播接收器从服务与活动进行通信

3）您可以使用aidl做