我正在尝试制作一个
Android应用程序,我需要在jni中访问加速度计.
java代码：
mSensorManager = (SensorManager)getSystemService(SENSOR_SERVICE); mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
jni代码：
jclass cls_context = env->FindClass("android/content/Context");
jfieldID tService = env->GetStaticFieldID(cls_context,"SENSOR_SERVICE","Ljava/lang/String;");
jstring jstr = (jstring)env->GetStaticObjectField(cls_context,tService);
//getSystemService(SENSOR_SERVICE);
jclass cls_act = env->GetObjectClass(activity);
jmethodID GetSystemService = env->GetMethodID(cls_act,"getSystemService","(Ljava/lang/String;)Ljava/lang/Object;");
jobject systemservice = env->CallObjectMethod(activity,GetSystemService,jstr);
//getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
jclass sensormanager = env->GetObjectClass(systemservice);
jmethodID getdefaultsensor = env->GetMethodID(sensormanager,"getDefaultSensor","(I)Landroid/hardware/Sensor;");
jobject sensor = env->CallObjectMethod(systemservice,getdefaultsensor,"Sensor.TYPE__ACCELEROMETER");
但是jobject传感器变得无效.
