安卓页面跳转 初级

1.
public class Activity02 extends Activity {
  
  private Button myButton = null;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        startService(intent);
        setContentView(R.layout.Activity02);
    
        myButton = (Button)findViewById(R.id.myButton);
        myButton.setOnClickListener(new MyButtonListener());
    }
class MyButtonListener implements OnClickListener{
   
@Override
public void onClick(View v) {
 
Intent intent = new Intent();
intent.setClass(Activity02.this, main.class);
Activity02.this.startActivity(intent);
}   

    }

2.
public class main extends Activity{
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.other);

Button  bt2=(Button)findViewById(R.id.bt2);
       bt2.setOnClickListener(new OnClickListener(){

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent=new Intent(main.this,Activity02.class);
startActivity(intent);
}
       
       });
}
}