ActivityC.java

package org.android.textbook.lesson2.launchmodesample;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class ActivityC extends Activity implements OnClickListener {

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

        ((Button) findViewById(R.id.button1)).setOnClickListener(this);

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_sub_task, menu);
        return true;
    }

    @Override
    public void onClick(View v) {
        Intent i = new Intent();
        i.setClass(this, ActivityB.class);
        startActivity(i);
    }

}