Internet Access for Android (Chat appp)

SlayH

Hello Everyone

I have created a chat app using QML and C++ for the backend Logic.
It works fine when I am using it on desktop, I have also built it for WASM and people from different countries have used it through githup pages.

I try to built it for Android, for some reason I can't login when using the emulator.

[https://github.com/HSley13/chatApp_client](github link)

A little bit of help would be much appreciated.
Thanks

jsulm

@SlayH Did you add needed permissions (https://developer.android.com/develop/connectivity/network-ops/connecting?hl=de)?
Did you do any debugging and error handling to see where exactly and for what reason it fails?

Immanuel

Here's a basic Forex trading strategy using QML (Qt Modeling Language):

qml
import QtQuick 2.12
import QtQuick.Controls 2.12
import QtQuick.Layouts 1.12

// Define trading strategy parameters
property real maShortPeriod: 50
property real maLongPeriod: 200
property real rsiPeriod: 14
property real overboughtLevel: 70
property real oversoldLevel: 30

// Define trading signals
property bool buySignal: false
property bool sellSignal: false

// Moving Average calculation
function calculateMA(period, data) {
    var sum = 0;
    for (var i = 0; i < period; i++) {
        sum += data[i].close;
    }
    return sum / period;
}

// RSI calculation
function calculateRSI(period, data) {
    var gain = 0;
    var loss = 0;
    for (var i = 0; i < period; i++) {
        var diff = data[i].close - data[i-1].close;
        if (diff > 0) {
            gain += diff;
        } else {
            loss -= diff;
        }
    }
    var avgGain = gain / period;
    var avgLoss = loss / period;
    return 100 - (100 / (1 + avgGain / avgLoss));
}

// Trading logic
function checkSignals(data) {
    var shortMA = calculateMA(maShortPeriod, data);
    var longMA = calculateMA(maLongPeriod, data);
    var rsi = calculateRSI(rsiPeriod, data);
    
    if (shortMA > longMA && rsi < oversoldLevel) {
        buySignal = true;
        sellSignal = false;
    } else if (shortMA < longMA && rsi > overboughtLevel) {
        buySignal = false;
        sellSignal = true;
    } else {
        buySignal = false;
        sellSignal = false;
    }
}

// Example usage
Rectangle {
    width: 800
    height: 600
    
    // Load historical data
    ListModel {
        id: historicalData
        // Load data from CSV or database
    }
    
    // Call trading logic function
    Component.onCompleted: checkSignals(historicalData)
    
    // Display trading signals
    Text {
        text: "Buy Signal: " + buySignal
        anchors.top: parent.top
        anchors.left: parent.left
    }
    
    Text {
        text: "Sell Signal: " + sellSignal
        anchors.top: parent.top
        anchors.right: parent.right
    }
}

This QML code defines:

Trading strategy parameters (MA periods, RSI period, overbought/oversold levels).
Moving Average (MA) and Relative Strength Index (RSI) calculations.
Trading logic checking for buy/sell signals based on MA crossover and RSI levels.
Example usage loading historical data and displaying trading signals.

Note:

This is a simplified example and should be expanded to include more features, error handling, and risk management.
QML is primarily used for UI development, not trading strategy implementation. Consider using a programming language like Python or C++ for production-ready trading strategies.
Always backtest and validate trading strategies before using them in live markets.

To use this code:

Install Qt Creator.
Create a new QML project.
Paste the code into the main.qml file.
Modify the code to suit your needs.
Run the project to see the trading signals.

Please consult Qt documentation and QML tutorials for further guidance.

SlayH

@jsulm Yes I did add the needed permission in the AndroidManifest.xml file but still didn't work