Android笔记（三）为按钮添加事件

1.在参数中直接new一个OnClickListener

Button button1=(Button) findViewById(R.id.button1);//事件源
    button1.setOnClickListener(new OnClickListener(){
            @Override
            //findViewById得到的是一个View对象
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Toast.makeText(FirstActivity.this, "haha", Toast.LENGTH_SHORT).show();
            }
        });

2.多个button共享一个Listener

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.first_layout);
        Button button1 = (Button) findViewById(R.id.button1);
        Button button2 = (Button) findViewById(R.id.button2);
        button1.setOnClickListener(new mylistener());
        button2.setOnClickListener(new mylistener());
        }
        //建一个监听器类
        public class mylistener implements OnClickListener{
        public void onClick(View v){
        switch(v.getId()){
        case R.id.button1:Toast.makeText(FirstActivity.this, "button1", Toast.LENGTH_SHORT).show();
        break;
        case R.id.button2:Toast.makeText(FirstActivity.this, "button2", Toast.LENGTH_SHORT).show();
        break;
        }
        }
        }