java – 从jni访问加速度计
发布时间:2020-12-15 00:34:44 所属栏目:Java 来源:网络整理
导读: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_co
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. 解决方法
Sensor.TYPE_ACCELEROMETER是int类型的内联常量,值为1,应该在那里传递.
但无论如何,分成9行JNI代码的那两行看起来很糟糕.离开那些原始的Java代码然后从JNI调用它不是更好吗? (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |