Android - New Intent starts particular method

Question

I want to start one of my existing activities and force the activity to call a specific method after it starts. Is this possible?

Can I define a method that should be called after creating the activity inside my Intent?

For example, something like:

Intent intent = new Intent(this, com.app.max.Home.class.myMethod);

Answer 1

No, I don't think you can have something like this:

Intent intent = new Intent(this, com.app.max.Home.class.method);

but you can do this:

Intent intent = new Intent(this, com.app.max.Home.class);
intent.putExtra("methodName","myMethod");
startActivity(intent);

and then in the called activity (where you need to start the method), you can take the intent and decide which method to call like this:

@Override
protected void onNewIntent(Intent intent) {
   super.onNewIntent(intent);
   if(intent.getStringExtra("methodName").equals("myMethod")){
      mymethod();
   }
}

Answer 2

Hello You can't call a particular method from intent but alternately you can use a service from intent and your requirement will be done.

Intent intent = new Intent(this, MyService.class);

and in MyService.class

public class MyService extends Service {
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
          yourParticularMethod();  //do your task and stop the service when your task is done for battery saving purpose
          context.stopService(new Intent(context, MyService.class)); 

        return super.onStartCommand(intent, flags, startId);
    }

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

and register this service in your manifest file like this

<application>
    <service android:name=".MyService" />
    .
    .
</application>

Answer 3

I solve this issue by using onCreate instead of onNewIntent.

Activity A:

Intent intent = new Intent(this, com.app.max.Home.class);
intent.putExtra("methodName","myMethod");
startActivity(intent);

com.app.max.Home Activity:

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.home);

    if(savedInstanceState == null)
    {
        Bundle extras = getIntent().getExtras();
        if (extras == null)
        {
            //Extra bundle is null
        }else{
            String method = extras.getString("methodName");

            if (method.equals("myMethod"))
            {
               //Call method here!
            }
        }
    }

Hope this solution solve your problem