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();
    }
    
    
    
}