Android JoystickManager

src/Joystick/JoystickManager.cc

@@ -83,6 +83,56 @@ void JoystickManager::setToolbox(QGCToolbox *toolbox)
             qCDebug(JoystickManagerLog) << "\tSkipping duplicate" << name;
         }
     }
+#elif defined(__android__)
+    QMutexLocker lock(&m_mutex);
+
+    computePossibleButtons(); //this is just needed to get number of supported buttons 
+
+    QAndroidJniEnvironment env;
+    QAndroidJniObject o = QAndroidJniObject::callStaticObjectMethod<jintArray>("android/view/InputDevice", "getDeviceIds");
+    jintArray jarr = o.object<jintArray>();
+    size_t sz = env->GetArrayLength(jarr);
+    jint *buff = env->GetIntArrayElements(jarr, nullptr);
+
+    int SOURCE_GAMEPAD = QAndroidJniObject::getStaticField<jint>("android/view/InputDevice", "SOURCE_GAMEPAD");
+    int SOURCE_JOYSTICK = QAndroidJniObject::getStaticField<jint>("android/view/InputDevice", "SOURCE_JOYSTICK");
+
+    for (size_t i = 0; i < sz; ++i) {
+        int axisCount, buttonCount;
+        QAndroidJniObject inputDevice = QAndroidJniObject::callStaticObjectMethod("android/view/InputDevice", "getDevice", "(I)Landroid/view/InputDevice;", buff[i]);
+        int sources = inputDevice.callMethod<jint>("getSources", "()I");
+        if (((sources & SOURCE_GAMEPAD) != SOURCE_GAMEPAD) //check if the input device is interesting to us
+                && ((sources & SOURCE_JOYSTICK) != SOURCE_JOYSTICK)) continue;
+
+	//get id and name
+        QString id = inputDevice.callObjectMethod("getDescriptor", "()Ljava/lang/String;").toString();
+        QString name = inputDevice.callObjectMethod("getName", "()Ljava/lang/String;").toString();
+
+	//get number of buttons
+	jintArray a = env->NewIntArray(31);
+	env->SetIntArrayRegion(a,0,31,_possibleButtons);
+
+        //QAndroidJniObject keyMap = inputDevice.callObjectMethod("getKeyCharacterMap", "()Landroid/view/KeyCharacterMap;");
+    	//QAndroidJniObject btns = keyMap.callStaticObjectMethod("android/view/KeyCharacterMap","deviceHasKeys", "([I)[Z", a);
+    	QAndroidJniObject btns = inputDevice.callObjectMethod("hasKeys", "([I)[Z", a);
+        jbooleanArray jSupportedButtons = btns.object<jbooleanArray>();
+        size_t btn_sz = env->GetArrayLength(jSupportedButtons);
+        jboolean* supportedButtons = env->GetBooleanArrayElements(jSupportedButtons, nullptr);
+        buttonCount=0;
+        for (size_t j=0;j<btn_sz;j++)
+            if (supportedButtons[j]) buttonCount++;
+
+        env->ReleaseBooleanArrayElements(jSupportedButtons, supportedButtons, 0);
+
+	//get number of axis
+        QAndroidJniObject rangeListNative = inputDevice.callObjectMethod("getMotionRanges", "()Ljava/util/List;");
+        axisCount = rangeListNative.callMethod<jint>("size");
+
+        qCDebug(JoystickManagerLog) << "\t" << name << "axes:" << axisCount << "buttons:" << buttonCount;
+    	_name2JoystickMap[name] = new Joystick(name, axisCount, buttonCount, buff[i], _multiVehicleManager);
+    }
+
+    env->ReleaseIntArrayElements(jarr, buff, 0);
 #endif
 
     if (!_name2JoystickMap.count()) {
@@ -93,6 +143,37 @@ void JoystickManager::setToolbox(QGCToolbox *toolbox)
     _setActiveJoystickFromSettings();
 }
 
+void JoystickManager::computePossibleButtons() {
+    static int ret[31];
+    int i;
+
+    for (i=1;i<=16;i++) {
+        QString name = "KEYCODE_BUTTON_"+QString::number(i);
+        ret[i-1] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", name.toStdString().c_str());
+    }
+    i--;
+
+    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_A");
+    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_B");
+    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_C");
+    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_L1");
+    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_L2");
+    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_R1");
+    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_R2");
+    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_MODE");
+    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_SELECT");
+    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_START");
+    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_THUMBL");
+    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_THUMBR");
+    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_X");
+    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_Y");
+    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_Z");
+
+    for (int j=0;j<i;j++)
+        qCDebug(JoystickManagerLog) << "\tpossible button: "+ret[j];
+
+    _possibleButtons = ret;
+}
 
 void JoystickManager::_setActiveJoystickFromSettings(void)
 {

src/Joystick/JoystickManager.h

@@ -31,6 +31,14 @@
 
 #include <QVariantList>
 
+#ifdef __android__
+    #include <jni.h>
+    #include <QtCore/private/qjni_p.h>
+    #include <QtCore/private/qjnihelpers_p.h>
+    #include <QtAndroidExtras/QtAndroidExtras>
+    #include <QtAndroidExtras/QAndroidJniObject>
+#endif
+
 Q_DECLARE_LOGGING_CATEGORY(JoystickManagerLog)
 
 class QGCApplicaiton;
@@ -78,6 +86,12 @@ private:
     
     static const char * _settingsGroup;
     static const char * _settingsKeyActiveJoystick;
+
+#ifdef __android__
+    void computePossibleButtons();
+    int * _possibleButtons;
+    QMutex m_mutex;
+#endif
 };
 
 #endif