点击事件的四种写法

 public class MainActivity extends Activity implements OnClickListener {    private Button button1,button2,button3,button4;    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        button1 = (Button) findViewById(R.id.button1);//button1使用xml中onclick属性        button2 = (Button) findViewById(R.id.button2);//button2使MainActivity实现OnClickListener接口        button3 = (Button) findViewById(R.id.button3);//button3使用内部类实现OnClickListener接口        button4 = (Button) findViewById(R.id.button4);//button4使用匿名内部类        button2.setOnClickListener(this);        button3.setOnClickListener(new MyOnclickListener());        //方式4：使用匿名内部类        button4.setOnClickListener(new OnClickListener() {            public void onClick(View v) {                Intent intent = new Intent(MainActivity.this,Second.class);                startActivity(intent);            }        });    }    //方式1：xml中button的onclick属性写点击方法    public void click(View view){//xml中onclick属性名与该方法名一致        Intent intent = new Intent(MainActivity.this,Second.class);        startActivity(intent);    }    //方式2：使MainActivity实现OnClickListener接口    public void onClick(View v) {        switch (v.getId()) {        case R.id.button2:            Intent intent = new Intent(MainActivity.this,Second.class);            startActivity(intent);            break;        default:            break;        }    }    //方式3：使用内部类实现OnClickListener接口    public class MyOnclickListener implements OnClickListener{        public void onClick(View v) {            // TODO Auto-generated method stub            Intent intent = new Intent(MainActivity.this,Second.class);            startActivity(intent);        }    }}