Glad to help.

OK, I solve the problem. Thank you very much for your help. You are the best.

Have you called setImageTargetsRef() method passing the ImageTargets instance before running the other code ?

Thank you for your help but when I do that it gives an error like that;

You need to pass a reference to ImageTargets class to your calling class, store the reference in a member variable of your class and then call it like this (suppose your class is called "MyClass"):

public class MyClass
{
  ImageTargets mImageTargets = null;


  public void setImageTargetsRef( ImageTargets imageTargets ) {

    mImageTargets = imageTargets;

  }


}

and then you can call (from your class code):

mImageTargets.deinitQCAR();

Note: this is just about Java programming...

Hi, I did what you said but I cant reach this method from another class. As you said i wrote it public but I cant reach it with these two commands;

deinitQCAR();
or
ImageTargets.deinitQCAR();

Hi,

you can use the same de-initialization code that you find in ImageTargets.java;

if you need to call it from a different class, you can create a public method in ImageTargets.java, for instance 

public void deinitQCAR() 

{

// put the deinit code here,

// same as the code that you find in onDestriy() in ImageTargets

}

And then you can call that method from any other class.

How can I deinitialize QCAR in the other class? With this command?

QCAR.deinit();

Intent intent=new Intent(Puzzle.this,ImageTargets.class);

Ok, but then you should simply deinitialize QCAR when you start "puzzle" (but not calling the entire onDestroy());

But when I dont call onDestroy function I have this situation;

I have a game project like this.

puzzle -> imageTargets -> question -> puzzle  -> imageTargets -> question ... and it goes on like this. (these are my classes and on the screen there are a button to switch between them)

but when 2nd puzzle come, than go to the  imageTargets class i have an error like that on telephone screen;

Failed to initialize QCAR.

and also I have an error like this on logcat;

Hi, you should never call onDestroy() explicitly; just start the new activity.

Thank you very much I did it but now I have a problem when calling onDestroy() function  think. In logcat I have an error like this;

Hi, maybe try to initialize your marker variable to some value, for instance (in your global declaration):

int marker = -1;

Actually, there is an example of this also in ImageTargets.cpp and ImageTargets.java, see the method setActivityPortraitMode() and boolean variable isActivityPortraitMode

The only difference is that it is a boolean, instead of an int, nothing more.

Actually I want to assign coming integer value to my cpp variable. I dont want to print it. 
I decleared an integer variable like this in cpp;

...

...

And in fuction I assigned like that;

...

Hi,

if your goal is to print an integer value (i.e. if your Java variable is an integer, as I understood from your original post), then you simply need to adjust the printInteger function code as follows:

JNIEXPORT void JNICALL
Java_org_example_treasurehuntnew_ImageTargets_printInteger(
                       JNIEnv *, jobject, jint value)
{
LOG("Hello, this is my integer  %d",  value);
}

private native void printString( String myJavaString );

JNIEXPORT jboolean JNICALL
Java_org_example_treasurehuntnew_ImageTargets_printString(
                 JNIEnv *, jobject, jstring myJavaString)
{
  const char *cstr = env->GetStringUTFChars( myJavaString, 0 );
  LOG("Hello, this is my string  %s",  cstr);
  env->ReleaseStringUTFChars(myJavaString, cstr);
}

Hi, I did what you said but I have a problem like this now;

I have to convert string to integer in this function; (marker is my global integer in cpp)
(I think that variable named value is String because of %s)

Hi, you also need to call the printInteger() function somewhere in your Java code, i.e. you need to put a line like this somewhere:

printInteger ( umut );

I have access my variable with this sentence from all of my java class;
MainScreen.number.marker

now I want to pass it ImageTarget.cpp
I add a command like this to my ImageTarget.java class;
...
private int mScreenWidth = 0;
private int mScreenHeight = 0;
private int umut = MainScreen.number.marker;
...

And I add a command like this to ImageTarget.java class;
...

Ok, so, if I understand correctly, you want to know how to implement a native method to pass down a variable from Java to C++, right ?

That's quite simple to do:

suppose your class is ImageTargets (ImageTargets.java), and you want to pass an integer to C++, what you can do is to declare a native method in your Java class (ImageTargets.java in our example), like this:

JNIEXPORT void JNICALL
Java_com_qualcomm_QCARSamples_ImageTargets_ImageTargets_printInteger(JNIEnv *, jobject, jint value)
{
    LOG("Hello, this is my integer  %s",  value);
}

But I have the catch Java class's integer value than use it in the ImageTarget.cpp class.

Hi,

one simple way is to Log the variable using the LOG function (see examples of usage of the LOG function in ImageTargets.cpp;

for instance to log an integer, you can write:

LOG( "My integer is: %d ", myIntegerVariable);

Then you can see the values in Eclipse (in the Log console) or using ADB logcat;

for more information on how to use adb logcat, refer to this page:

http://developer.android.com/tools/help/logcat.html