Android-如何引用在BroadcastReceiver中注册接收者的活动？

Question

In my MainActivity I have:

this.registerReceiver(new SmsListener(),new IntentFilter("RECEIVED SMS"));

In my manifest.xml I have:

 <receiver android:name="com.example.SmsListener">

and in my BroadcastReceiver subclass I have:

public class SmsListener extends BroadcastReceiver{

    @Override
    public void onReceive(Context context, Intent intent) {

        // how do I reference MainActivity here?

    }
}

Answer 1

You can't get activity from Context. If you really need it, I guess your only option is to save the reference of your MainActivity in a private static field and then make a static "getInstance()" method.

public class MainActivity extends Activity {
    private static MainActivity sActivity = null;

    ...

    @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        sActivity = this;
        ...
    }

    public static MainActivity getInstance() {
        return sActivity;
    }
    ...
}

From your receiver you can now call

public class SmsListener extends BroadcastReceiver{

    @Override
    public void onReceive(Context context, Intent intent) {

        MainActivity myMainActivity = MainActivity.getInstance();
        ...

    }
}

However, I don't think you want to do it.

Answer 2

try this solution

public class SmsListener extends BroadcastReceiver{

@Override
public void onReceive(Context context, Intent intent) {

    Intent i = new Intent (context, MainActivity.class);
    context.startActivity(i);

}
}