AndroidInit.cc

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#include "AndroidInterface.h"
#ifndef QGC_NO_SERIAL_LINK
#include "AndroidSerial.h"
#endif
#include <QtCore/QJniEnvironment>
 
#include "QGCLoggingCategory.h"
 
QGC_LOGGING_CATEGORY(AndroidInitLog, "Android.AndroidInit");
 
#ifdef QGC_GST_STREAMING
 
static jobject _class_loader = nullptr;
 
extern "C" {
extern void gst_amc_jni_set_java_vm(JavaVM* java_vm);
 
jobject gst_android_get_application_class_loader(void)
{
    return _class_loader;
}
}
 
#endif
 
static jboolean jniInit(JNIEnv* env, jobject thiz)
{
    qCDebug(AndroidInitLog) << Q_FUNC_INFO;
 
#ifdef QGC_GST_STREAMING
    const jclass contextClass = env->GetObjectClass(thiz);
    if (!contextClass) {
        return JNI_FALSE;
    }
 
    const jmethodID getClassLoaderId = env->GetMethodID(contextClass, "getClassLoader", "()Ljava/lang/ClassLoader;");
    if (QJniEnvironment::checkAndClearExceptions(env)) {
        env->DeleteLocalRef(contextClass);
        return JNI_FALSE;
    }
 
    const jobject classLoader = env->CallObjectMethod(thiz, getClassLoaderId);
    if (QJniEnvironment::checkAndClearExceptions(env)) {
        env->DeleteLocalRef(contextClass);
        return JNI_FALSE;
    }
 
    if (_class_loader) {
        env->DeleteGlobalRef(_class_loader);
        _class_loader = nullptr;
    }
    _class_loader = env->NewGlobalRef(classLoader);
    env->DeleteLocalRef(classLoader);
    env->DeleteLocalRef(contextClass);
#else
    Q_UNUSED(env);
    Q_UNUSED(thiz);
#endif
 
    return JNI_TRUE;
}
 
static jint jniSetNativeMethods()
{
    qCDebug(AndroidInitLog) << Q_FUNC_INFO;
 
    const JNINativeMethod javaMethods[]{{"nativeInit", "()Z", reinterpret_cast<void*>(jniInit)}};
 
    QJniEnvironment env;
    if (!env.registerNativeMethods(AndroidInterface::kJniQGCActivityClassName, javaMethods, std::size(javaMethods))) {
        qCWarning(AndroidInitLog) << "Failed to register native methods for"
                                  << AndroidInterface::kJniQGCActivityClassName;
        return JNI_ERR;
    }
 
    qCDebug(AndroidInitLog) << "Main Native Functions Registered";
    return JNI_OK;
}
 
jint JNI_OnLoad(JavaVM* vm, void*)
{
    qCDebug(AndroidInitLog) << Q_FUNC_INFO;
 
    void* env = nullptr;
    if (vm->GetEnv(&env, JNI_VERSION_1_6) != JNI_OK) {
        return JNI_ERR;
    }
 
    if (jniSetNativeMethods() != JNI_OK) {
        return JNI_ERR;
    }
 
#ifdef QGC_GST_STREAMING
    gst_amc_jni_set_java_vm(vm);
#endif
 
    AndroidInterface::setNativeMethods();
 
#ifndef QGC_NO_SERIAL_LINK
    AndroidSerial::setNativeMethods();
#endif
 
    QNativeInterface::QAndroidApplication::hideSplashScreen(333);
 
    return JNI_VERSION_1_6;
}
 
void JNI_OnUnload(JavaVM* vm, void*)
{
    qCDebug(AndroidInitLog) << Q_FUNC_INFO;
 
#ifdef QGC_GST_STREAMING
    JNIEnv* env = nullptr;
    if (vm->GetEnv(reinterpret_cast<void**>(&env), JNI_VERSION_1_6) == JNI_OK && _class_loader) {
        env->DeleteGlobalRef(_class_loader);
        _class_loader = nullptr;
    }
#else
    Q_UNUSED(vm);
#endif
 
#ifndef QGC_NO_SERIAL_LINK
    AndroidSerial::cleanupJniCache();
#endif
}