四种android的Button监听

//第一种按钮监听

MainActivity.java

public class MainActivity extends Activity{

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

 

//定义一个Button

Button  bt = (Button)findViewById(R.id.bt);

bt.setOnClickListener(new MyListener());

}  

public class MyListener implements OnClickListener{

      @Override

      public void onClick(View v) {

           btClick();

       }

    }

}

 

 

//第二种按钮监听(比较常用)

MainActivity.java

public class MainActivity extends Activity implements OnClickListener{

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

 

//定义一个Button

Button  bt = (Button)findViewById(R.id.bt);

bt.setOnClickListener(this);

    }  

     public void onClick(View v) {

           switch(v.getId){

              case R.id.bt:

                  btClick();

                  break;

              default:

                  break;

          }

    }

}

 

 

 

//第三种按钮监听

MainActivity.java

public class MainActivity extends Activity{

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

 

//定义一个Button

Button  bt = (Button)findViewById(R.id.bt);

bt.setOnClickListener(new OnClickListener() {

          

          @Override

           public void onClick(View v) {

              btClick();

                }

        });

    }  

   

}

 

 

 

//第四种按钮监听

MainActivity.java

public class MainActivity extends Activity{

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

 

//定义一个Button

Button  bt = (Button)findViewById(R.id.bt);

}  

public void buttonClicked(View v){

      btClick();

}

   

}

 

activity_main.xml

<Button

           android:id="@+id/bt"

           android:layout_width="wrap_content"

           android:layout_height="wrap_content"

           android:onClick="buttonClicked"

 />