android custom listener or callback or interface

download: http://www.mediafire.com/file/pmk0jckln50sm78/MyListner1.zip


package collapsingtoolbarlikewhatsapp.startingandroid.com.mylistner;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity implements MyListener {

    TextView tv_msg;

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

        tv_msg =(TextView) findViewById(R.id.tv_msg);

        MyButton mMyButton = new MyButton(this);

    }

    @Override
    public void callback(MyButton view, String result) {

        System.out.println(" MainActivity callback");

        tv_msg.setText("MainActivity callback" + " result="+result);

    }
}


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package collapsingtoolbarlikewhatsapp.startingandroid.com.mylistner;

public class MyButton {
    MyListener ml;

    // constructor
    MyButton(MyListener ml) {
        this.ml = ml;

        myLogicToIntimateOthere();
    }

    public void myLogicToIntimateOthere() {
        ml.callback(this, "success");
    }
}


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package collapsingtoolbarlikewhatsapp.startingandroid.com.mylistner;
import android.view.View;

public interface MyListener {
    // you can define any parameter as per your requirement
    public void callback(MyButton view, String result);
}