[SOLVED] Qt on Android : How to Vibrate the device ?

andreyc

Don't know maybe it is not important but I don't see semicolon at the end of a signature in the "example":http://qt-project.org/doc/qt-5/qandroidjniobject.html#callStaticMethod-2
@
jint value_out = QAndroidJniObject::callStaticMethod<jint>("org/qtproject/example/Chronometer/Vibrate", "add", "(I)I;", /* <<<< at the end of this string */ value_in);
@

nologinma

I have try whitout semicolon in this way:

@ QAndroidJniObject::callStaticMethod<void>("org/qtproject/example/Chronometer/Vibrate", "start", "(I)V", 300);

int value_in = 10;
jint  value_out = QAndroidJniObject::callStaticMethod<jint>("org/qtproject/example/Chronometer/Vibrate", "add", "(I)I",  value_in);

qDebug() << "IN = "  << value_in << ", OUT = " << value_out;@

but the result is the same:

@D/Qt (20929): ..\chronometer\mainwindow.cpp:123 (void MainWindow::manageStartEnd()): IN = 10 , OUT = 0@

I have a new error message when I quit for my application:

@W/dalvikvm(24652): threadid=11: thread exiting with uncaught exception (group=0x416c92a0)
E/AndroidRuntime(24652): FATAL EXCEPTION: QtThread-1516700272
E/AndroidRuntime(24652): java.lang.NullPointerException
E/AndroidRuntime(24652): at org.qtproject.example.Chronometer.Vibrate.start(Vibrate.java:21)
E/AndroidRuntime(24652): at dalvik.system.NativeStart.run(Native Method)
W/SurfaceView(24652): CHECK surface infomation creating=false formatChanged=false sizeChanged=false visible=false visibleChanged=true surfaceChanged=true realSizeChanged=false redrawNeeded=false left=false top=false@

nologinma

I have found the solution and I have change the java class in this way:

@
import android.content.Context;
import android.os.Vibrator;
import android.app.Activity;

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

public void start(int x)
{
Vibrator v;
v = (Vibrator) this.getSystemService(Context.VIBRATOR_SERVICE);
v.vibrate(x);
}

public static int add(int x)
{
return 53;

}

}@

and now the result is the following (without error):

@
D/Qt (27146): ..\chronometer\mainwindow.cpp:123 (void MainWindow::manageStartEnd()): IN = 10 , OUT = 53@

The problem is that I haven't the vibration in my device :-(

andreyc

Try to declare the method start as static.
Also if Vibrator::vibrate is async then you need to allocate v on a heap.

nologinma

there is something I am not considering, and I begin to doubt the official example: "Here":http://qt-project.org/doc/qt-5/qtandroidextras-notification-example.html [qt-project.org].

I have developed the new class java in this way:

@package org.qtproject.example.Chronometer;

import android.content.Context;
import android.os.Vibrator;
import android.app.Activity;

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

public static Vibrator m_vibrator;
public static Vibrate m_istance;

public Vibrate()
{
System.out.println("Vibrate costrutor called");
m_istance = this;
}

public static int start(int x)
{
System.out.println("start function called");
if (m_vibrator == null)
{
if (m_istance != null)
{
m_vibrator = (Vibrator) m_istance.getSystemService(Context.VIBRATOR_SERVICE);
m_vibrator.vibrate(x);
return 1;
}
else
{
return 3;
}
}
else
{
m_vibrator.vibrate(x);
return 2;
}
}

public static int add(int x)
{
System.out.println("Add function called");
return 53;
}

}
@

and I call the class from c++ in this way:

@jint value_out1 = QAndroidJniObject::callStaticMethod<jint>("org/qtproject/example/Chronometer/Vibrate", "start", "(I)I", 300);

qDebug() << "OUT = " << value_out1;

int value_in = 10;
jint value_out = QAndroidJniObject::callStaticMethod<jint>("org/qtproject/example/Chronometer/Vibrate", "add", "(I)I", value_in);

qDebug() << "IN = " << value_in << ", OUT = " << value_out;@

the output is the following (and I still have the vibration of the device):

@I/System.out(12301): start function called
D/Qt (12301): ..\chronometer\mainwindow.cpp:120 (void MainWindow::manageStartEnd()): OUT = 3
I/System.out(12301): Add function called
D/Qt (12301): ..\chronometer\mainwindow.cpp:125 (void MainWindow::manageStartEnd()): IN = 10 , OUT = 53@

As you can see the function "start" is called but the m_istance is null and the the function return the value 3:

@D/Qt (12301): ..\chronometer\mainwindow.cpp:120 (void MainWindow::manageStartEnd()): OUT = 3@

This means that the java class constructor is never called.

In fact, in the log I do not see the inscription: "Vibrate costrutor called"

aidinMC

add this attribute to activity tag in AndroidMainifest.xml
@android:name="org.qtproject.example.Chronometer.Vibrate"@

nologinma

Wow !!!!! Now work. Thanks you very much.

List below steps for all developers.

change the .pro file in QT in this way:

@QT += core gui androidextras@

@ANDROID_PACKAGE_SOURCE_DIR = $$PWD/android@

Add the permission in the AndroidMainifest.xml

@<uses-permission android:name="android.permission.VIBRATE"/>@

replace the attribute in the activity:

from

@android:name="org.qtproject.qt5.android.bindings.QtActivity"@

to

@android:name="org.qtproject.example.Chronometer.Vibrate"@

Where Chronometer and Vibrate string can be changes.

add the include following in the mainwindow.h

@#include <QtAndroidExtras/QAndroidJniObject>@

add the following Vibrate.java class in the following directory

myprogget>android/src/org/qtproject/example/Chronometer/

where Chronometer can be change:

@//
// Vibrate.java
//
package org.qtproject.example.Chronometer;

import android.content.Context;
import android.os.Vibrator;
import android.app.Activity;
import android.os.Bundle;

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

public static Vibrator m_vibrator;
public static Vibrate m_istance;

public Vibrate()
{
m_istance = this;
}

public static void start(int x)
{
if (m_vibrator == null)
{
if (m_istance != null)
{
m_vibrator = (Vibrator) m_istance.getSystemService(Context.VIBRATOR_SERVICE);
m_vibrator.vibrate(x);
}

   }
   else m_vibrator.vibrate(x);

}
}@

in your program call class in this way:

@QAndroidJniObject::callStaticMethod<void>("org/qtproject/example/Chronometer/Vibrate", "start", "(I)V", 300);@

andreyc

Thank you for putting it all together.

Could you update the title and add [SOLVED] so other people will be able to find it.

Spike89

Hi

First of all thank you for sharing your solution.
but when i replaced the attribute in the activity:
from
@android:name="org.qtproject.qt5.android.bindings.QtActivity"@
to
@android:name="org.qtproject.example.Chronometer.Vibrate"@

i got this error msgs:
@Warning: Dependency not found: C:/Qt/Qt5.3.0/5.3/android_armv7/plugins/platformthemes
Warning: Dependency not found: C:/Qt/Qt5.3.0/5.3/android_armv7/plugins/platforminputcontexts
Error while building/deploying project vibration (kit: Android for armeabi-v7a (GCC 4.7, Qt 5.3.0))
When executing step 'Deploy to Android device'@

What am i doing wrong?

nologinma

It is not easy to understand, but it seems a problem of Dependency.

Please can you check if you are following all steps indicate above ?

You have put the file Vibrate.java under the following directory ?

myprogget>android/src/org/qtproject/example/Chronometer/

and add the file Vibrate.java into your qt projects (as exist file) ?

If you share your .pro file perhaps I will understand better the problem.