Android call method from another app

Question

I have 2 android apps. Both are installed on the phone. Lets say the package name for the two are com.android.test1 and com.android.test2. How can i call the method Main2method() from the test1.Main class ?

Class for test1:

package com.android.test1;
import android.app.Activity;
import android.os.Bundle;

public class Main extends Activity {  

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }
}

Class for test2:

package com.android.test2;
import android.app.Activity;
import android.os.Bundle;

public class Main2 extends Activity {  

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }

    public static void Main2method() {
        //do something..
    }
}

Answer 1

Maybe you can broadcast an Intent to call it.

Intent it = new Intent("com.android.test2.Main2method");
context.sendBroadcast(it)

Make a BroadcastReceiver in com.android.test2.Main2 to receive the broadcast:

public class ActionReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        if ("com.android.test2.Main2method".equalsIgnoreCase(intent.getAction())) {
            Main2method();
        } 
    }
}

Register the receiver in onCreate method of class Main1 :

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    ...

    receiver = new ActionReceiver();
    IntentFilter filter = new IntentFilter();
    filter.addAction("com.android.test2.Main2method");
    registerReceiver(receiver, filter);
    ...
}

Answer 2

If you want to send callbacks from app1 to app2:

1. you should throw your own Intent with data from app1. (take look at PendingIntent ).
2. into yout app2 you should register BroadcastReceiver which will handle your app1's Intents .
3. broadcastreceiver's onReceive method (in app2) will be called each time when your Intent will be thrown by app1 and catched by app2. (put your logics there)

Answer 3

in order to call method between different application you will need to use, Intent

also you will need intent-filter and BroadcastReceiver

Answer 4

You cannot directly call a method of one app from another app. Instead, you have to invoke one activity from another and fetch result using Intent filters.

These links might help you

http://www.vogella.com/articles/AndroidIntent/article.html

http://saigeethamn.blogspot.in/2009/08/android-developer-tutorial-for_31.html