结合 2 个扩展活动进行短信通知：D

Question

所以，我想创建一个应用程序，每次收到短信时都可以向用户发出通知。 我的主要问题是我很困惑如何组合我的 2 个活动/课程。我在 SMSReceiver 类中扩展了 BroadcastReceiver，以便它可以检测是否有任何新短信到来，并且我在 SMSNotif 类中扩展了 Activity。问题是我不能在每个活动中扩展超过 1 类。

这是 SMSReceiver 类：

public class SMSReceiver extends BroadcastReceiver {

@Override
public void onReceive(Context arg0, Intent arg1) {
    // TODO Auto-generated method stub

    Bundle bundle = arg1.getExtras();
    SmsMessage[] msgs = null;
    String str = "";
    if (bundle != null) {
        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]);
            str += "SMS from " + msgs[i].getOriginatingAddress();
            str += " :";
            str += msgs[i].getMessageBody().toString();
            str += "\n";
        }

        Toast.makeText(arg0, str, Toast.LENGTH_SHORT).show();
    }
    //Intent i = new Intent(SMSReceiver.this, SMSNotif.class);
}

}

这是我的 SMSNotif 类：

public class SMSNotif extends Activity{
static final int HELLO_ID = 1;

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);

    //String ns = Context.NOTIFICATION_SERVICE;
    NotificationManager mNotificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);

    //int icon = R.drawable.ic_launcher;
    String tickerText = "Hello";
    //long when = System.currentTimeMillis();

    Notification notification = new Notification(R.drawable.ic_launcher, tickerText, System.currentTimeMillis());

    //Context context = getApplicationContext();
    String contentTitle = "My notification";
    String contentText = "Hello World!";
    Intent notificationIntent = new Intent(this, SMSNotif.class);
    PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0);

    notification.setLatestEventInfo(this, contentTitle, contentText, contentIntent);
    notification.defaults = Notification.DEFAULT_ALL;
    mNotificationManager.notify(HELLO_ID, notification);

}

}

同样，我的主要问题是：如何组合这些活动，以便每次用户收到新短信时，我的应用程序都会显示它的 notif（而不仅仅是 SMSNotif 的 toast 形式） 。

Answer 1

这是解决您的问题的技巧：

将 BroadcastReceiver 类设置为 Activity 类的本地类。这样，接收者可以在活动中执行某些操作，

public class SMSNotif extends Activity{

    class SMSReceiver extends BroadcastReceiver {

        @Override
        public void onReceive(Context arg0, Intent arg1) {
            ...
            someActivityMetod("Hello world from receiver");
        }

    }

    void someActivityMetod(String message)
    {
        ...
    }
}

您还必须在活动代码中（取消）注册接收者

public class SMSNotif extends Activity{

            BroadcastReceiver myReceiver = null;



    @Override
    public void onPause()
    {

        if (myReceiver != null)
        {
            unregisterReceiver(myReceiver);
            myReceiver = null;
        }
        super.onPause();
    }

    @Override
    public void onResume() {
        super.onResume();

        if (myReceiver == null)
        {
            myReceiver = new SMSReceiver();
            IntentFilter filter = new IntentFilter("Some.Action.Code");
            registerReceiver(myReceiver, filter);
        }
    }