Function ChangeVolume

engine/source/platformAndroid/T2DActivity.cpp:110–171

}

void ChangeVolume(bool up) {

    // Attaches the current thread to the JVM.
    jint lResult;
    jint lFlags = 0;
    JavaVM* lJavaVM = platState.engine->app->activity->vm;
    JNIEnv* lJNIEnv = platState.engine->app->activity->env;

    JavaVMAttachArgs lJavaVMAttachArgs;
    lJavaVMAttachArgs.version = JNI_VERSION_1_6;
    lJavaVMAttachArgs.name = "NativeThread";
    lJavaVMAttachArgs.group = NULL;

    lResult=lJavaVM->AttachCurrentThread(&lJNIEnv, &lJavaVMAttachArgs);
    if (lResult == JNI_ERR) {
        return;
    }

    // Retrieves NativeActivity.
    jobject lNativeActivity = platState.engine->app->activity->clazz;
    jclass ClassNativeActivity = lJNIEnv->GetObjectClass(lNativeActivity);

    // Retrieves Context.AUDIO_SERVICE.
    jclass ClassContext = lJNIEnv->FindClass("android/content/Context");
    jfieldID FieldAUDIO_SERVICE =lJNIEnv->GetStaticFieldID(ClassContext,"AUDIO_SERVICE", "Ljava/lang/String;");
    jobject AUDIO_SERVICE = lJNIEnv->GetStaticObjectField(ClassContext, FieldAUDIO_SERVICE);

    // Runs getSystemService(AUDIO_SERVICE)
    jclass ClassAudioManager = lJNIEnv->FindClass("android/media/AudioManager");
    jmethodID MethodGetSystemService = lJNIEnv->GetMethodID(ClassNativeActivity, "getSystemService","(Ljava/lang/String;)Ljava/lang/Object;");
    jobject lAudioManager = lJNIEnv->CallObjectMethod(lNativeActivity, MethodGetSystemService, AUDIO_SERVICE);

    //get AudioManager.STREAM_MUSIC
    jfieldID FieldSTREAM_MUSIC =lJNIEnv->GetStaticFieldID(ClassAudioManager,"STREAM_MUSIC", "I");
    jint STREAM_MUSIC = lJNIEnv->GetStaticIntField(ClassAudioManager, FieldSTREAM_MUSIC);

    //get AudioManager.FLAG_SHOW_UI
    jfieldID FieldFLAG_SHOW_UI =lJNIEnv->GetStaticFieldID(ClassAudioManager,"FLAG_SHOW_UI", "I");
    jint FLAG_SHOW_UI = lJNIEnv->GetStaticIntField(ClassAudioManager, FieldFLAG_SHOW_UI);

    if (up) {
    	//get AudioManager.ADJUST_RAISE
    	jfieldID FieldADJUST_RAISE =lJNIEnv->GetStaticFieldID(ClassAudioManager,"ADJUST_RAISE", "I");
    	jint ADJUST_RAISE = lJNIEnv->GetStaticIntField(ClassAudioManager, FieldADJUST_RAISE);

    	//audio.adjustStreamVolume(AudioManager.STREAM_MUSIC, AudioManager.ADJUST_RAISE, AudioManager.FLAG_SHOW_UI);
        jmethodID MethodAdjustStreamVolume = lJNIEnv->GetMethodID(ClassAudioManager, "adjustStreamVolume", "(III)V");
        lJNIEnv->CallVoidMethod(lAudioManager,MethodAdjustStreamVolume, STREAM_MUSIC, ADJUST_RAISE, FLAG_SHOW_UI);

    } else {
    	//get AudioManager.ADJUST_LOWER
    	jfieldID FieldADJUST_LOWER =lJNIEnv->GetStaticFieldID(ClassAudioManager,"ADJUST_LOWER", "I");
    	jint ADJUST_LOWER = lJNIEnv->GetStaticIntField(ClassAudioManager, FieldADJUST_LOWER);

    	//audio.adjustStreamVolume(AudioManager.STREAM_MUSIC, AudioManager.ADJUST_LOWER, AudioManager.FLAG_SHOW_UI);
    	jmethodID MethodAdjustStreamVolume = lJNIEnv->GetMethodID(ClassAudioManager, "adjustStreamVolume", "(III)V");
    	lJNIEnv->CallVoidMethod(lAudioManager,MethodAdjustStreamVolume, STREAM_MUSIC, ADJUST_LOWER, FLAG_SHOW_UI);
    }