android - 在 BroadcastReceiver 中使用 IntentService 时如何传递上下文变量？

Question

我需要在 killCall 函数中使用 Context 对象，但我不知道如何将 Context 对象传递给 KillCall，你能帮我吗？谢谢!

public class ReceiverCall extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub

              Intent msgIntent = new Intent(context, InternetServerCall.class);     
              context.startService(msgIntent);
    }

}


public class InternetServerCall extends IntentService{

    public InternetServerCall(String name) {
        super("InternetServerCall");
        // TODO Auto-generated constructor stub
    }

    @Override
    protected void onHandleIntent(Intent intent) {      
        HandleCall.killCall(context); //Need  context
    }

}


public class HandleCall {

    public static boolean killCall(Context context) {
        try {
            ....
           Toast.makeText(context, "PhoneStateReceiver kill incoming call Ok",Toast.LENGTH_SHORT).show();

        } catch (Exception ex) { // Many things can go wrong with reflection calls
            return false;
        }
        return true;
    }

}

Answer 1

您可以通过执行 InternetServerCall.this 将 Context 放入 InternetServerCall 中。这是因为所有 Android Components 都覆盖了 Context 类，其中有 IntentService。

您还可以在 IntentService 中使用 getApplicationContext() 来获取上下文。你可以看我另一个类似的回答Pass a Context an IntentService .

---

但是您不能直接显示来自IntentService 的Toast，因为它需要UI 线程但IntentService 运行到后台线程。您需要使用 Handler 来显示 Toast，如下例

public class TestService extends IntentService {


    private Handler handler;  

    public TestService(String name) {
        super(name);
        // TODO Auto-generated constructor stub
    }

    public TestService () {
          super("TestService"); 
    }


    @Override 
    public int onStartCommand(Intent intent, int flags, int startId) {  
       handler = new Handler();  
       return super.onStartCommand(intent, flags, startId);  
    }  

    @Override
    protected void onHandleIntent(Intent intent) {
          // TODO Auto-generated method stub
         handler.post(new Runnable() {  
                @Override 
                public void run() {        
                            Toast.makeText(getApplicationContext(), "Handling Intent..", Toast.LENGTH_LONG).show(); 
                }  
          });   
     } 
}