Emit is not working when calling on a separate android thread

Nickolas

Hey. Sorry for my english.

There is a code that running on android on a separate Thread (Java Code) like this:

@
public class ClientThread extends Thread
{
public void run()
{
MainActivity.nativeMethod(); // not working
}
}

public class MainActivity extends QtActivity
{
private static final String TAG = "MainActivity";
private static MainActivity _instance = null;
private static ClientThread _clientThread = null;

public MainActivity()
{
    _instance = this;
}

public void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);

    nativeMethod(); // working

    _clientThread = new ClientThread();
    _clientThread.start();

}

public static native void nativeMethod();

}@

And there is C++ bridge for that:

@class TestObject : public QObject
{
Q_OBJECT

public:
explicit TestObject(QObject *parent = 0);
static TestObject *getInstance();

Q_SIGNALS:
void nativeMethod();

public Q_SLOTS:

};

static void jniNativeMethod(JNIEnv *, jclass)
{
qDebug() << "works threaded or non-threaded calls"
emit TestObject::getInstance()->nativeMethod();
}@

Also a QML connection:

@import TestObjectPackage 1.0

Connections
{
target: TestObjectPackage.testObjectInstance
onNativeMethod:
{
console.log("QML received signal!");
}
}@

jniNativeMethod calls every time but emit not sending signal to QML on sepearate thread. Could you help me?

jeremy_k

I wonder if the problem is due to the use of a static signal.

Cross-thread signal delivery uses an event loop in the receiving thread. Intra-thread delivery is a direct call by default. The static use might confuse the detection of the correct connection type.