How to pass an object from one activity to another on Android

Question

I am trying to work on sending an object of my customer class from one Activity and display it in another Activity.

The code for t

Answer 1

I had always wondered why this can't be as simple as calling into a method of the other activity. I recently wrote a utility library that makes it almost as simple as that. You can check it out here(https://github.com/noxiouswinter/gnlib_android/wiki/gnlauncher).

GNLauncher makes sending objects/data to an Activity from another Activity etc as easy as calling a function in tha Activity with the required data as parameters. It introduces type safety and removes all the hastles of having to serialize, attaching to the intent using string keys and undoing the same at the other end.

Usage

Define an interface with the methods you want to call on the Activity to launch.

public interface IPayload {
    public void sayHello(String name, int age);
}

Implement the above interface on the Activity to launch into. Also notify GNLauncher when the activity is ready.

public class Activity_1 extends Activity implements IPayload {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //Notify GNLauncher when the Activity is ready. 
        GNLauncher.get().ping(this);
    }

    @Override
    public void sayHello(String name, int age) {
        Log.d("gnlib_test", "Hello " + name + "! \nYour age is: " + age);
    }
}

In the other Activity, get a proxy to the above Activity and call any method with the desired parameters.

public class Activity_2 extends Activity {
    public void onClick(View v) {
        ((IPayload)GNLauncher.get().getProxy(this, IPayload.class, Activity_1.class)).sayHello(name, age);
    }
}

The first activity will be launched and the method called into with the required parameters.

Prerequisites

Please refer to https://github.com/noxiouswinter/gnlib_android/wiki#prerequisites for information on how to add the dependencies.