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.
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:
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
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.
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
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