Android 中抽象类的最佳示例 [英] Best example of Abstract class in Android

问题描述

我正在尝试在 Android 中设计一个抽象类和方法，并通过从我的父 Activity 类扩展类来调用这些方法，但我不知道如何调用我的抽象方法.

我的代码:

MainActivity.java

public class MainActivity extends MyActivity {@覆盖公共无效 onTest() {Log.d("MyLog", "onTest");} }

MyActivity.java

公共抽象类 MyActivity 扩展 Activity {@覆盖protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);}公共抽象无效 onTest();}

这是上面的代码片段，请告诉我如何在Android中使用Abstract，因为我以前从未这样做过.

解决方案

注册和取消注册任何广播接收器

这是一个示例，您可以使用它来注册和取消注册 ANY BroadcastReceiver 使用抽象类:

<块引用>

基类:

公共抽象类 BaseReceiverActivity 扩展 AppCompatActivity{私有 BroadCastReceiver 接收器；私有 IntentFilter 过滤器；公共抽象 BroadCastReceiver getReceiver();公共抽象 IntentFilter getFilter();@覆盖公共无效 onStart(){super.onStart();配置接收器()注册接收器(接收器，过滤器)；}@覆盖公共无效 onStop(){super.onPause();取消注册接收器(接收器)；}私有无效 registerMyReceiver(){注册接收器(接收器，过滤器)；}私有无效配置接收器(){接收器 = getReceiver();过滤器 = getFilter();}}

<块引用>

子类:

公共类 WifiScanner 扩展 BaseReceiverActivity{@覆盖公共无效onCreate(捆绑sis){super.onCreate(sis);setContentView(R.layout.yourLayout);}@覆盖公共广播接收器 getReceiver(){返回新的 YourReceiver();}@覆盖公共 IntentFilter getFilter(){返回 IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));}}

完整的工作代码

这里

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(); }

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

解决方案

Register and Unregister any BroadcastReceiver

Here is an example which you can use to register and un-register ANY BroadcastReceiver using an Abstract class:

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();
    }

}

Child class:

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));
    }

}

Full working code

Here

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