publicclass MainActivityextends Activity {

          private Buttonbtn;

          private TextViewtv_show;

          @Override

          protectedvoid onCreate(Bundle savedInstanceState) {

                    super.onCreate(savedInstanceState);

                    setContentView(R.layout.activity_main);

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

                    tv_show = (TextView) findViewById(R.id.tv_show);

                    //第一种匿名内部类

                    btn.setOnClickListener(new OnClickListener() {

                              @Override

                              publicvoid onClick(View v) {

                                        tv_show.setText("好啦,马上到!!");

                              }

                    });          

          }

}

    privatevoid clickTwo() {

                    btn.setOnClickListener(this);

          }

       @Override

       publicvoid onClick(View v) {

                    tv_show.setText("好啦,马上到!!");

          }

/**

           * 第三种方法:第一个修饰用public 第二个方法里面 View

           *@param v

           */

          publicvoid clickThree(View v){

                    tv_show.setText("各位同学请注意:今天下午苍老师来华育六班视察!!");

          }

    publicvoid onClick(View v) {

           switch (v.getId()) {

          case R.id.btn:

                    tv_show.setText("好啦");

                    break;

          case R.id.btn2:][

                    tv_show.setText("好啦,马上到!!");

                    break;

          case R.id.btn3:

                    tv_show.setText("好啦,马上到!!今晚华育小树林见!!");

                    break;

          default:

                    break;

          }

          }