什么是执行OnClickListener与活动的效果？

问题描述

我不明白为什么我必须实现OnClickListener使用的OnClick法。假设这code：

I don't understand why I have to implement the OnClickListener to use the OnClick-method. Assuming this code:

public class KlickitestActivity extends Activity implements OnClickListener {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
}

@Override
public void onClick(View v) {
    // code what happens when a click is made
}

从类OnClickListener我只使用方法的onClick（视图v） - 而这一次将被覆盖。为什么我不能只定义没有实现OnClickListener onClick的法？

From the class OnClickListener I only use the method onClick(View v) - and this one is overwritten. Why can't I just define the onClick-method without implementing the OnClickListener?

推荐答案

可以。你可以通过使用一个匿名内部类：

You can. You can do that by using an Anonymous Inner Class :

Button1.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View view) {
           //Do stuff
        }});
Button2.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View view) {
           //Do stuff
        }});

不过实现一个OnClickListener可以更容易地处理事件，并提高了code可读性。即您可以使用一个监听器方法，并传递一个查看来处理多个按钮/听众提供一个switch语句，类似于：

However implementing an OnClickListener makes it easier to handle events, and improves code readability. i.e You can use one Listener method, and passing a View to handle multiple buttons/listeners with a switch statement, something similar to :

public void onClick(View view){
    switch(view.getId()){

    case R.id.Button1:
        //Stuff for button 1
        break;

    case R.id.Button2:
        //Stuff for button 2
        break;
        break;

   case R.id.Button3:
        //Stuff for button 3
        break;
    }

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