尝试不重复自己(android/java) [英] trying not to repeat myself (android/java)

问题描述

怎么了? 我是开发的初学者，在任何地方我读到不要重复自己"，所以我真的很想重复自己. 我在应用程序的每个活动中复制并粘贴了一段代码，我怀疑可能有一种不重复的代码-可能创建一个类并调用其方法-但我不知道如何实现它. 下面的代码就是我在说的:我在导航抽屉中使用的东西，它在我的应用程序的每个活动的主类中:

whats up? i'm a beginner to development and everywhere i read 'do not repeat yourself', so i really mind about repeating myself. there is a piece of code that i copied and pasted in every single activity of my app, and i suspect there might be a way of not repeating it - maybe creating a class and calling its methods - but i don't know how to implement it. the code below is what i'm talking about: something i use in my navigation drawer and it's inside the main class of each activity of my app:

@Override
        public void onItemClick(AdapterView<?> parent, View arg1, int position,
                long arg3) {

            if (position == 0) {
                Toast.makeText(this, "categories baby", Toast.LENGTH_SHORT).show();
            } else if (position == 1){

                final Context context = this;

                Intent getUserData = getIntent();
                String userEmail = getUserData.getStringExtra("user_email");

                Intent intent = new Intent(context, NewAdActivity.class);
                intent.putExtra("userEmail", userEmail);
                startActivity(intent);


            } else if (position == 2){

                final Context context = this;

                Intent getUserData = getIntent();
                String userEmail = getUserData.getStringExtra("user_email");

                Intent intent = new Intent(context, AdListActivity.class);
                intent.putExtra("userEmail", userEmail);
                startActivity(intent);

            } else {
                Session session = Session.getActiveSession();
                session.closeAndClearTokenInformation();

                Intent intent = new Intent(context, MainActivity.class);
                startActivity(intent);
            }
        }

您能给我一些关于如何重用它而不是复制/粘贴的提示吗? 谢谢！

can you give me some hints on how to reuse this rather than copy/paste? thanks!

推荐答案

您可以创建一个扩展Activity并实现您的代码的新类，然后使您的所有活动扩展该类.

You can create an new class that extends Activity and implements your code and then make all your activities extend that class.

该代码似乎是AdapterView.OnItemClickListener的实现，因此您可以创建以下内容:

That code seems to be the implementation of the AdapterView.OnItemClickListener, so you can create something like:

public abstract class MyActivityWithListener extends Activity 
        implements AdapterView.OnItemClickListener {
    @Override
    public void onItemClick(AdapterView<?> parent, View arg1, int position, long arg3) {
        ....
    }

}

然后您的主要活动可能是这样的:

And then your main activity could be something like:

public class MainActivity extends MyActivityWithListener {
    ...
}

这篇关于尝试不重复自己(android/java)的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！