Reflection to access advanced telephony features
- by Tyler
I am trying to use reflection to access some advanced features of the telephony api not published. Currently I am having trouble instantiating a serviceManager object that is needed to get the "phone" service as a binder which I can then use to instantiate a telephony object which is needed to make a call, end call, etc...
currently when I make the call
serviceManagerObject = tempInterfaceMethod.invoke(null, new Object[] { new Binder() });
it returns a nullPointerException. I believe this has to due with creating a new Binder instead of sending the appropriate binder (which I am unsure of which one is appropriate)
public void placeReflectedCall() throws ClassNotFoundException,
SecurityException, NoSuchMethodException, IllegalArgumentException,
IllegalAccessException, InvocationTargetException,
InstantiationException {
String serviceManagerName = "android.os.IServiceManager";
String serviceManagerNativeName = "android.os.ServiceManagerNative";
String telephonyName = "com.android.internal.telephony.ITelephony";
Class telephonyClass;
Class telephonyStubClass;
Class serviceManagerClass;
Class serviceManagerStubClass;
Class serviceManagerNativeClass;
Class serviceManagerNativeStubClass;
Method telephonyCall;
Method telephonyEndCall;
Method telephonyAnswerCall;
Method getDefault;
Method[] temps;
Constructor[] serviceManagerConstructor;
// Method getService;
Object telephonyObject;
Object serviceManagerObject;
String number = "1111111111";
telephonyClass = Class.forName(telephonyName);
telephonyStubClass = telephonyClass.getClasses()[0];
serviceManagerClass = Class.forName(serviceManagerName);
serviceManagerNativeClass = Class.forName(serviceManagerNativeName);
Method getService = // getDefaults[29];
serviceManagerClass.getMethod("getService", String.class);
Method tempInterfaceMethod = serviceManagerNativeClass.getMethod(
"asInterface", IBinder.class);
// this does not work
serviceManagerObject = tempInterfaceMethod.invoke(null,
new Object[] { new Binder() });
IBinder retbinder = (IBinder) getService.invoke(serviceManagerObject,
"phone");
Method serviceMethod = telephonyStubClass.getMethod("asInterface",
IBinder.class);
telephonyObject = serviceMethod
.invoke(null, new Object[] { retbinder });
telephonyCall = telephonyClass.getMethod("call", String.class);
telephonyEndCall = telephonyClass.getMethod("endCall");
telephonyAnswerCall = telephonyClass.getMethod("answerRingingCall");
telephonyCall.invoke(telephonyObject, number);
}
Thanks in advance for any answers.
