Qt 5.2 beta 1 - getting ANDROID_ID from the settings

[thierry]

Hi all,

I'm trying to get the ANDROID_ID from the settings through the JNI. You're supposed to be able to get it via the following code:

@QAndroidJniObject activity = QAndroidJniObject::callStaticObjectMethod("org/qtproject/qt5/android/QtNative", "activity", "()Landroid.app.Activity;");
QAndroidJniObject result = QAndroidJniObject::callStaticObjectMethod("android/provider/Settings/Secure",
                                                 "getString", "(Landroid/content/ContentResolver;Ljava/lang/String;)Ljava/lang/String;",
                                                 activity.object<jobject>(), "android_id");

@
The problem is that it seems it can't find android/provider/Settings/Secure. It fails with a class not found exception.

Has someone done this before?

[thierry]

The reason is pretty simple: Secure is an inner class. so it should be used as "android/provider/Settings$Secure"

[maour]

This code works for me, thanks to <eskil_> <cstr> #necessitas

@
QAndroidJniObject myID = QAndroidJniObject::fromString("android_id");
QAndroidJniObject activity = QAndroidJniObject::callStaticObjectMethod("org/qtproject/qt5/android/QtNative", "activity", "()Landroid/app/Activity;");
QAndroidJniObject appctx = activity.callObjectMethod("getApplicationContext","()Landroid/content/Context;");
QAndroidJniObject contentR = appctx.callObjectMethod("getContentResolver", "()Landroid/content/ContentResolver;");
QAndroidJniObject result = QAndroidJniObject::callStaticObjectMethod("android/provider/Settings$Secure","getString", "(Landroid/content/ContentResolver;Ljava/lang/String;)Ljava/lang/String;",contentR.object<jobject>(), myID.object<jstring>());
@

[benlau]

Hi Maour,

I have tried your code in main() but it throw error in execution :

@
F/libc (28452): Fatal signal 11 (SIGSEGV) at 0x0000002c (code=1), thread 28494 (xample.delegate)
@

Caused by :

@
QAndroidJniObject appctx = activity.callObjectMethod("getApplicationContext","()Landroid/content/Context;");
@

p.s activity.isValid() return false.

Do I need to setup anything before execute your code?

Thanks.

[maour]

Hi Benlau,

There isn't anything special about that code, just create a new project and put that code on main(), i don't know about your error but activity.isValid() should return true.

Can you execute androidextras example from Qt example directory?

[benlau]

HI maour,

Thanks for your reply. Just tried the androidextras , it is working. Then I switch back to original project , I found it is also working too. It is rather strange..

[luca]

@maour said in [RESOLVED] Qt 5.2 beta 1 - getting ANDROID_ID from the settings:

This code works for me, thanks to <eskil_> <cstr> #necessitas

@
QAndroidJniObject myID = QAndroidJniObject::fromString("android_id");
QAndroidJniObject activity = QAndroidJniObject::callStaticObjectMethod("org/qtproject/qt5/android/QtNative", "activity", "()Landroid/app/Activity;");
QAndroidJniObject appctx = activity.callObjectMethod("getApplicationContext","()Landroid/content/Context;");
QAndroidJniObject contentR = appctx.callObjectMethod("getContentResolver", "()Landroid/content/ContentResolver;");
QAndroidJniObject result = QAndroidJniObject::callStaticObjectMethod("android/provider/Settings$Secure","getString", "(Landroid/content/ContentResolver;Ljava/lang/String;)Ljava/lang/String;",contentR.object<jobject>(), myID.object<jstring>());
@

Just to thanks for that code !