在Java中，如何使用继承简化代码? (Android开发.) [英] In Java, How do I simplify my code using inheritance? (Android Dev.)

问题描述

在各种活动中，我都有非常相似的方法.

In various activities I have very similar methods.

例如:

@Override
public void onClick(View v) {
    switch (v.getId()) {
    case R.id.ibHome:
        Intent menuIntent = new Intent(v.getContext(),Menu.class);
        startActivity(menuIntent);
        break;
    }

}

和

@Override
public void onClick(View v) {
     /**  */

    //
    switch(v.getId()){
        case R.id.bNew:
            Intent newSwimmerIntent = new Intent(v.getContext(),NewSwimmer.class);
            startActivity(newSwimmerIntent);
            break;
case R.id.ibHome:
            Intent menuIntent = new Intent(v.getContext(),Menu.class);
            startActivity(menuIntent);
            break;

是否有一种方法(我认为将使用继承)来防止在每个类中明确声明 menuIntent ?

is there a way (which I assume would be using inheritance) to prevent the menuIntent being explicitly stated in each each class?

谢谢.

推荐答案

您可以使用继承，但这实际上并不是最佳选择，特别是如果两个活动不是直接以"Is-A"关系关联的话.

You could use inheritance, but that actually may not be the best choice, especially if the two activities are not directly related in an "Is-A" relationship.

在这种情况下，最好声明一个实现OnClickListener接口的新类.然后，您可以实例化该类并将其绑定到按钮的单击事件，无论它们在何处使用.

In this case, you're probably better off declaring a new class that implements OnClickListener interface. You can then instantiate that class and bind it to your buttons' click events wherever they're used.

这是一个例子:

public class HomeButtonHandler implements OnClickListener{

        @Override
        public void onClick(View v) {
            Intent menuIntent = new Intent(v.getContext(),Menu.class);
            v.getContext().startActivity(menuIntent);            

        }

    }

在您的活动中，您只需将HomeButtonHandler绑定到按钮的onClickListner:

And in your activities, you can just bind the HomeButtonHandler to the onClickListner of the button:

homeButton.setOnClickListener(new HomeButtonHandler());

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