Android-为什么endCall方法有效，但answerRingingCall不起作用？ [英] Android - Why does endCall method work but answerRingingCall doesn't work?

问题描述

我使用以下代码来处理来自服务内的来电。当我调用endCall方法（我的手机的Android版本为ICS）时，它可以完美工作。但是，当我调用answerRingingCall方法时，由于没有权限修改电话状态而出现异常。我知道Google曾一度撤消了此权限，但是由于我可以调用结束调用方法，因此也无法调用应答调用方法的解释是什么？我的意思是..两种方法都会修改手机的状态，所以怎么了？有没有办法解决这个问题？

I use the following code to handle incoming calls from within a service. It works perfectly when i invode the endCall method (My phone's Android Version is ICS). But when I invoke the answerRingingCall method i get an exception for not having permission to modify phone state. I know that Google revoked this permission at one point but since i can invoke the end call method what is the explanation for not being able to invoke the answer call method as well? I mean..both methods modify the phone's state, so what's up? Is there a way to fix this?

   try {
        TelephonyManager tm = (TelephonyManager)getBaseContext().getSystemService(Context.TELEPHONY_SERVICE);
        Class c = Class.forName(tm.getClass().getName());
        Method m = c.getDeclaredMethod("getITelephony");
        m.setAccessible(true);
        Object telephonyService = m.invoke(tm); // Get the internal ITelephony object
        c = Class.forName(telephonyService.getClass().getName()); // Get its class
        m = c.getDeclaredMethod("endCall"); // Get the "endCall()" method
        m.setAccessible(true); // Make it accessible
        m.invoke(telephonyService); // invoke endCall()
    }
    catch (Exception e) {
        Log.w("exception",e);
    }

推荐答案

如果我不得不猜测，我想说的是，在您的Phone.apk中的com.android.phone.PhoneInterfaceManager的OEM版本中，endCall函数不会调用forceCallCallPermission（）；在发送结束呼叫的请求之前。

If I had to guess, I'd say in your OEM version of com.android.phone.PhoneInterfaceManager inside the Phone.apk the endCall function doesn't call enforceCallPermission(); before sending the request to end the call.

与在answerRingingCall函数中一样，调用executeCallPermission（）;

Where as in the answerRingingCall function calls enforceCallPermission();

您可以尝试破解，在ITelephony对象上访问private方法，将sendRequestAsync设置为true，然后将其作为输入参数4调用，即CMD_ANSWER_RINGING_CALL。

You could try a hack where you get access the the private method, on the ITelephony object, sendRequestAsync set accessible to true, and then call it with 4 as the input param, aka CMD_ANSWER_RINGING_CALL.

这将避免权限检查。

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