public class MainActivity extends Activity implements OnClickListener{

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);
//点击方式1

        Button but1=(Button)findViewById(R.id.button1);

        but1.setOnClickListener(new OnClickListener() {

            @Override

            public void onClick(View arg0) {

                Toast.makeText(MainActivity.this, "点击1事件", 800).show();

            }

        });
//点击方式2

        Button but2=(Button)findViewById(R.id.button2);

        but2.setOnClickListener(new MyOnClickListener());

        //点击方式3   类上面实现OnClickListener

        Button but2=(Button)findViewById(R.id.button3);

        but2.setOnClickListener(this);

    }
//点击方式4  

      public void onClickMethod(View v){

        Toast.makeText(this, "显示4", 800).show();

      }

    class MyOnClickListener implements OnClickListener{

 　　　　 @Override

        public void onClick(View arg0) {

            Toast.makeText(MainActivity.this,"点击2事件", 800).show();

        }

    }

    //重写onClick

    @Override

    public void onClick(View arg0) {

        Toast.makeText(this, "点击3事件", 800).show();

    }

}