Android中Abstract类的最佳示例 [英] Best example of Abstract class in Android

问题描述

我正在尝试在Android中设计一个Abstract类和方法，并通过从父Activity类扩展该类来调用这些方法，但是我不怎么调用我的abstract方法.

I am trying to design one Abstract class and method in Android and call those methods by extending the class from my parent Activity class but I don't how to call my abstract method.

MyCode:

MainActivity.java

public class MainActivity extends MyActivity {

    @Override
    public void onTest() {

       Log.d("MyLog", "onTest");

    } }

MyActivity.java

public abstract class MyActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);

    }

public abstract void onTest(); }

所以这是上面的代码片段，请让我知道如何在Android中使用Abstract，因为我以前从未做过此事.

So this is the above code snippet , please let me know , how to use Abstract in Android because i have never done this before.

推荐答案

注册和注销任何BroadcastReceiver

这里是一个示例，您可以使用抽象类注册和注销 ANY BroadcastReceiver:

BaseClass:

BaseClass:

public abstract class BaseReceiverActivity extends AppCompatActivity{

    private BroadCastReceiver receiver;
    private IntentFilter filter;

    public abstract BroadCastReceiver getReceiver();
    public abstract IntentFilter getFilter();

    @Override
    public void onStart(){
        super.onStart();
        configureReceiver()
        registerReceiver(receiver, filter);
    }

    @Override
    public void onStop(){
        super.onPause();
        unregisterReceiver(receiver);
    }

    private void registerMyReceiver(){        
        registerReceiver(receiver, filter);    
    }

    private void configureReceiver(){
         receiver = getReceiver();
         filter   = getFilter();
    }

}

儿童班:

public class WifiScanner extends BaseReceiverActivity{

    @Override
    public void onCreate(Bundle sis){
         super.onCreate(sis);
         setContentView(R.layout.yourLayout);
    }

    @Override
    public BroadCastReceiver getReceiver(){
         return new YourReceiver();
    }

    @Override
    public IntentFilter getFilter(){
         return IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
    }

}

完整的工作代码

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