Qt on Android : How to shutdown the device or simulate the press of Power button

[nologinma]

I'd like to build a small application that reboot the device or better put in PowerOff my device.

I saw that there are in qt the specific class and the I have call a JNI java class.

I have assign the right permissiom to my app following:

@<uses-permission android:name="android.permission.REBOOT"/>
<uses-permission android:name="android.permission.DEVICE_POWER"/>
<uses-permission android:name="android.permission.MODIFY_PHONE_STATE"/>@

and the call in qt c++ to my JNI class is the following:

@QAndroidJniObject::callStaticMethod<void>("org/qtproject/example/PowerOff/Next72Utility", "powerOff", "()V");@

and external java class is the following:

@//
// Next72Utility.java
//
package org.qtproject.example.PowerOff;

import android.content.Context;

import android.app.Activity;
import android.view.WindowManager;
import android.view.WindowManager.LayoutParams;
import android.os.PowerManager;

public class Next72Utility extends org.qtproject.qt5.android.bindings.QtActivity
{

public static Next72Utility m_istance;

public Next72Utility()
{
m_istance = this;
}

public static void powerOff()
{
if (m_istance != null)
{
System.out.println("I'm here");
PowerManager pm = (PowerManager) m_istance.getSystemService(Context.POWER_SERVICE);
System.out.println("pm = " + pm);
pm.reboot(null);

   }

}

@}

The program is compiled without error and the output (console) is the following (no errors):

@Starting remote process.D/dalvikvm(24655): Late-enabling CheckJNI
D/dalvikvm(24655): Trying to load lib /data/data/org.qtproject.example.PowerOff/lib/libgnustl_shared.so 0x4186f148
D/dalvikvm(24655): Added shared lib /data/data/org.qtproject.example.PowerOff/lib/libgnustl_shared.so 0x4186f148
D/dalvikvm(24655): No JNI_OnLoad found in /data/data/org.qtproject.example.PowerOff/lib/libgnustl_shared.so 0x4186f148, skipping init
D/dalvikvm(24655): Trying to load lib /data/data/org.qtproject.example.PowerOff/lib/libQt5Core.so 0x4186f148
D/dalvikvm(24655): Added shared lib /data/data/org.qtproject.example.PowerOff/lib/libQt5Core.so 0x4186f148
D/dalvikvm(24655): Trying to load lib /data/data/org.qtproject.example.PowerOff/lib/libQt5Gui.so 0x4186f148
D/dalvikvm(24655): Added shared lib /data/data/org.qtproject.example.PowerOff/lib/libQt5Gui.so 0x4186f148
D/dalvikvm(24655): No JNI_OnLoad found in /data/data/org.qtproject.example.PowerOff/lib/libQt5Gui.so 0x4186f148, skipping init
D/dalvikvm(24655): Trying to load lib /data/data/org.qtproject.example.PowerOff/lib/libQt5Widgets.so 0x4186f148
D/dalvikvm(24655): Added shared lib /data/data/org.qtproject.example.PowerOff/lib/libQt5Widgets.so 0x4186f148
D/dalvikvm(24655): No JNI_OnLoad found in /data/data/org.qtproject.example.PowerOff/lib/libQt5Widgets.so 0x4186f148, skipping init
D/dalvikvm(24655): Trying to load lib /data/data/org.qtproject.example.PowerOff/lib/libQt5AndroidExtras.so 0x4186f148
D/dalvikvm(24655): Added shared lib /data/data/org.qtproject.example.PowerOff/lib/libQt5AndroidExtras.so 0x4186f148
D/dalvikvm(24655): No JNI_OnLoad found in /data/data/org.qtproject.example.PowerOff/lib/libQt5AndroidExtras.so 0x4186f148, skipping init
D/dalvikvm(24655): Trying to load lib /data/data/org.qtproject.example.PowerOff/qt-reserved-files/plugins/platforms/android/libqtforandroid.so 0x4186f148
D/dalvikvm(24655): Added shared lib /data/data/org.qtproject.example.PowerOff/qt-reserved-files/plugins/platforms/android/libqtforandroid.so 0x4186f148
I/Qt (24655): qt start
D/dalvikvm(24655): Trying to load lib /data/data/org.qtproject.example.PowerOff/lib/libPowerOff.so 0x4186f148
D/dalvikvm(24655): Added shared lib /data/data/org.qtproject.example.PowerOff/lib/libPowerOff.so 0x4186f148
D/dalvikvm(24655): No JNI_OnLoad found in /data/data/org.qtproject.example.PowerOff/lib/libPowerOff.so 0x4186f148, skipping init
D/dalvikvm(24655): GC_CONCURRENT freed 341K, 12% free 7160K/8135K, paused 2ms+2ms, total 27ms
D/dalvikvm(24655): WAIT_FOR_CONCURRENT_GC blocked 10ms
D/dalvikvm(24655): WAIT_FOR_CONCURRENT_GC blocked 10ms
D/libEGL (24655): loaded /system/lib/egl/libEGL_mali.so
D/libEGL (24655): loaded /system/lib/egl/libGLESv1_CM_mali.so
D/libEGL (24655): loaded /system/lib/egl/libGLESv2_mali.so
D/ (24655): Device driver API match
D/ (24655): Device driver API version: 10
D/ (24655): User space API version: 10
D/ (24655): mali: REVISION=Linux-r2p4-02rel0 BUILD_DATE=Tue Oct 16 15:37:13 KST 2012
D/OpenGLRenderer(24655): Enabling debug mode 0
I/System.out(24655): I'm here
I/System.out(24655): pm = android.os.PowerManager@418c2040
"org.qtproject.example.PowerOff" terminated.@

but the device is until running......
Do you have a solution for this problem ?

[nologinma]

I have read several article and I understand that

1. to shutdown the device you have to ROOT permission

2. you can put in sleep mode without ROOT permission but not in shutdown.

Observation

I have a SAMSUNG NOTE 10.1 (tablet) and when I press the power button for 1 second the device go to sleep.

If I press the power button for 3 seconds I have a dialog screen that it propose if I turn off the device or not.

Then I want to simulate the second case (button for 3 second the power button).

@void keyPressPowerButton()
{
QKeyEvent event(QEvent::KeyPress, Qt::Key_PowerOff, Qt::NoModifier);
QApplication::sendEvent(mainWindow, &event);
}@

But It go in sleep mode not it in shutdown mode (with dialog screen that it propose if I turn off the device or not)

How can I simulate the Qt::Key_PowerOff for 3 seconds ?