Android增加监听的三种实现方式

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //加载布局文件
        setContentView(R.layout.activity_main);
        //获得布局中的按钮
        btn = (Button) findViewById(R.id.btn);
        //为按钮增加匿名内部类监听
        btn.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                //打印提示信息
                Toast.makeText(MainActivity.this, "匿名内部类实现监听", Toast.LENGTH_SHORT).show();
            }
        });
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //加载布局文件
        setContentView(R.layout.activity_main);
        //获得布局中的按钮
        btn = (Button) findViewById(R.id.btn);
        //内部类实现点击监听
        btn.setOnClickListener(new MyClickListener());
    }
    //定义一个内部类
    class  MyClickListener implements OnClickListener{

        @Override
        public void onClick(View arg0) {
            // TODO Auto-generated method stub
            Toast.makeText(MainActivity.this, "内部类实现监听", Toast.LENGTH_SHORT).show();
        }
        
    }

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //加载布局文件
        setContentView(R.layout.activity_main);
        //获得布局中的按钮
        btn = (Button) findViewById(R.id.btn);
        //增加监听，传递this对象，this代表的是被点击的控件
        btn.setOnClickListener(this);
    }
    
    @Override
    public void onClick(View view) {
        // TODO Auto-generated method stub
        switch (view.getId()) {
        case R.id.btn:
            Toast.makeText(MainActivity.this, "实现接口实现监听", Toast.LENGTH_SHORT).show();
            break;
        }
    }