從非活動類啟動BroadcastReceiver或IntentService

Question

如何從非活動類啟動BroadcastReceiver或IntentService

首先，我的意思是發送意圖並讓其運行BroadcastService或IntentService

即：

我有課：

public class NumberOne{
     @Override
     public int functionOne(){
       int i = 1 + 4;

        if(/*something is true*/){
        Intent intent = new Intent(this,intetServiceOne.class);
        intent.putExtra("id","path");
        context.startService(intent);
      }
      else {/*continue*/
      }
        return i;  
      }
       //other functions
     } 

並且如果functionOne中的條件為true，則啟動IntentService

public class IntentServiceClassOne extends IntentService {
     public IntentServiceClassOne () {
        super("IntentServiceClassOne ");
     }

    @Override
    protected void onHandleIntent(Intent intent) {
    String data = intent.getStringExtra("id");
        Log.d("dataIs: ", data);
    }
    //more functions what to do
    }

它不取決於它是IntentService還是BroadcastReceiver謝謝

Answer 1

要啟動服務，您需要上下文實例。 您可以將其作為構造函數參數傳遞：

public class NumberOne{
     Context context;

     public NumberOne(Context context){
         this.context = context;
     }
     public int functionOne(Context context){
       int i = 1 + 4;

        if(/*something is true*/){
           Intent intent = new Intent(this,intetServiceOne.class);
           intent.putExtra("id","path");
           context.startService(intent);
        }
        else {/*continue*/
        }
        return i;  
    }
    //other functions
} 

您不必傳遞Activity實例，Context就足夠了。 它可以是應用程序上下文。 您可以通過getApplicationContext()方法獲取它

您還可以在Application對象中創建靜態實例，並從中獲取靜態實例：

public class YourApplication extends Application {

    public static YourApplication INSTANCE;

    public void onCreate(){
        super.onCreate();

        INSTANCE = this;
    }
}

您的課程如下所示。

public class NumberOne{

     public int functionOne(Context context){
       int i = 1 + 4;

        if(/*something is true*/){
           Intent intent = new Intent(this,intetServiceOne.class);
           intent.putExtra("id","path");
           YourApplication.INSTANCE.startService(intent);
        }
        else {/*continue*/
        }
        return i;  
    }
    //other functions
} 

但是不是很好的解決方案。

最后，您可以創建回調偵聽器並將其設置在您的類中，如下所示：

public class NumberOne{
     //add setter
     YourListener yourListener;
     public int functionOne(Context context){
       int i = 1 + 4;

        if(/*something is true*/){
           if(yourListener != null){
               yourListener.onFunctionOneCall();
           }
        }
        else {/*continue*/
        }
        return i;  
    }
    //other functions

    public interface YourListener{
        void onFunctionOneCall();
    }
} 

還有一些您具有上下文的地方-例如活動中：

numberOneInstance.setYourListener(new YourListener(){
    @Override
    public void onFunctionOneCall(){
               Intent intent = new Intent(this,intetServiceOne.class);
               intent.putExtra("id","path");
               this.startService(intent);
    }
});

或者您可以通過二傳手設置上下文

public class NumberOne{
     Context context;

     public setContext(Context context){
         this.context = context;
     }
     public int functionOne(Context context){
       int i = 1 + 4;

        if(/*something is true*/){
           if(context != null){
              Intent intent = new Intent(this,intetServiceOne.class);
              intent.putExtra("id","path");
              context.startService(intent);
           }
        }
        else {/*continue*/
        }
        return i;  
    }
    //other functions
}