layouts doesn't work in android

[DrageFabeldyr]

i've written a small program to test qt in android it has only 4 buttons, all of them just close application

.h

#ifndef TESTANDROID_H
#define TESTANDROID_H

#include <QMainWindow>
#include <QHBoxLayout>
#include <QPushButton>

namespace Ui {
class testandroid;
}

class testandroid : public QMainWindow
{
    Q_OBJECT

public:
    explicit testandroid(QWidget *parent = 0);
    ~testandroid();

private slots:
    void button_click();

private:
    QHBoxLayout *v_layout1;
    QHBoxLayout *v_layout2;
    QVBoxLayout *h_layout;

    QPushButton *button1;
    QPushButton *button2;
    QPushButton *button3;
    QPushButton *button4;

    Ui::testandroid *ui;
};

#endif // TESTANDROID_H

.c

#include "testandroid.h"
#include "ui_testandroid.h"

testandroid::testandroid(QWidget *parent) : QMainWindow(parent)//, ui(new Ui::testandroid)
{
    //ui->setupUi(this);

    button1 = new QPushButton(tr("1"), this);
    //button1 = new QPushButton;
    //button1->setText("1");
    button2 = new QPushButton(tr("2"), this);
    button3 = new QPushButton(tr("3"), this);
    button4 = new QPushButton(tr("4"), this);
    //button4 = new QPushButton;
    //button4->setText("4");
    connect(button1, SIGNAL(clicked()), this, SLOT(button_click()));
    connect(button2, SIGNAL(clicked()), this, SLOT(button_click()));
    connect(button3, SIGNAL(clicked()), this, SLOT(button_click()));
    connect(button4, SIGNAL(clicked()), this, SLOT(button_click()));

    //h_layout1 = new QHBoxLayout(this);
    v_layout1 = new QHBoxLayout;
    v_layout2 = new QHBoxLayout;
    h_layout = new QVBoxLayout;

    v_layout1->addWidget(button1);
    v_layout1->addWidget(button2);
    v_layout2->addWidget(button3);
    v_layout2->addWidget(button4);
    h_layout->addLayout(v_layout1);
    h_layout->addLayout(v_layout2);
    this->setLayout(h_layout);
}

testandroid::~testandroid()
{
    //delete ui;
}

void testandroid::button_click()
{
    exit(0);
}

void testandroid::on_pushButton_clicked()
{
    exit(0);
}

void testandroid::on_pushButton_4_clicked()
{
    exit(0);
}

and here is what i see on emulator

and on my phone (Sony M2 Dual, Android 5.1)

[raven-worx]

@DrageFabeldyr
since you are using a QMainWindow you are not supposed to call setLayout() on it.
You should rather add a content widget (with your layout) via setCentralWidget() to avoid interfering with QMainWindow's default layout like you encountered.

[DrageFabeldyr]

@raven-worx
thank you a lot, i was sure i'm using QWidget, but in fact i used QMainWindow and didn't see it
i changed it to QWidget and now it works correctly