<?xml version="1.0" encoding="utf-8"?> 
<selector xmlns:android="http://schemas.android.com/apk/res/android"> 
 
  <item android:drawable="@drawable/button_press" android:state_pressed="true"/> 
  <item android:drawable="@drawable/button_nomal" android:state_focused="false" android:state_pressed="false"/> 
  <item android:drawable="@drawable/button_focus" android:state_focused="true"/> 
  <item android:drawable="@drawable/button_nomal" android:state_focused="false"/> 
 
</selector> 

  <Button 
 android:id="@+id/button1" 
 android:layout_width="wrap_content" 
 android:layout_height="wrap_content" 
 android:text="button效果演示" 
 android:background="@drawable/selector" />  

Button button1=(Button) this.findViewById(R.id.button1); 
    button1.setOnClickListener(new View.OnClickListener() { 
       
      @Override 
      public void onClick(View v) { 
        // TODO Auto-generated method stub 
        Toast.makeText(getApplicationContext(), "你点击了button按钮", Toast.LENGTH_SHORT).show(); 
      } 
    }); 

   <Button 
   android:id="@+id/button2" 
   android:layout_width="wrap_content" 
   android:layout_height="wrap_content" 
   android:text="button效果演示" 
   android:background="@drawable/button_nomal"/> 

  Button button2=(Button) this.findViewById(R.id.button2); 
    button2.setOnTouchListener(new OnTouchListener() { 
     
    @Override 
    public boolean onTouch(View v, MotionEvent event) { 
      // TODO Auto-generated method stub 
      if(event.getAction()==MotionEvent.ACTION_DOWN){ 
        v.setBackgroundResource(R.drawable.button_press); 
      }else if(event.getAction()==MotionEvent.ACTION_UP){ 
        v.setBackgroundResource(R.drawable.button_nomal); 
      } 
      return false; 
    } 
  });