Hi, Yes sorry, I have not been precise enough.
When I say it's not working, what I meen is that the execution gets through to the Java layer (the Log.i methods get called, and my message is logged in logcat) but the dialog is not displayed, and the application does not respond anymore. After some time I get an ANR notification and the app force closes. Florent. On Wed, Dec 15, 2010 at 2:28 AM, Bob Kerns <[email protected]> wrote: > What does "can't get it to work" mean? > > Is mActivity really a reference to the correct activity? > Does is successfully find the method, or take the 'return false;' > exit? (Which is rather odd in a void method!) > Does it crash? > Does it call the Java code, but with a corrupted message? > > If it's that last, I'd look for the usual C++ headaches, such as using > a std::string() that has been destructed by the time you use it. > > If it's crashing: Where is it crashing? How is mJNIEnv declared and > assigned? > > Have you stepped through it in a debugger? I don't know hard that is > to do on a device (or emulator) with the NDK, but you could certainly > write a little test app on your PC and test the C++ side there. You'd > have to substitute on the Java side, of course; a simple > System.out.println("Success: " + pMsg); would suffice. > > If none of that helps, I'd suggest asking the question in a list that > relates to the NDK rather than the SDK. You'd find a larger pool of > people able to understand and answer your questions on the topic. > > On Dec 14, 10:30 am, Floof <[email protected]> wrote: > > Hi list ! > > > > I'm having this problem: > > > > In my application, I use a GLSurfaceView for 3D rendering. The real > > rendering is done by calling native methods, coded in C++. > > > > Once in a while (upon user clicks on 3D scene objects) the native > > rendering engine should be able to call Java methods (through JNI) > > that display a dialog box. > > > > I can't get it to work, that's driving me crazy. > > > > Here is the native method: > > > > [CODE] > > void MyCPlusPlusClass::showDialog(const std::string& pMsg) > > { > > jclass lClass = mJNIEnv->GetObjectClass(mActivity); > > if (!lClass) > > { > > return false; > > } > > jmethodID lMethId = mJNIEnv->GetMethodID(lClass, > > "showMessageDialog", "(Ljava/lang/String;)V"); > > if (!lMethId) > > { > > return false; > > } > > jstring lJavaString = mJNIEnv->NewStringUTF(pMessage.c_str()); > > mJNIEnv->CallVoidMethod(mActivity, lMethId, lJavaString);} > > > > [/CODE] > > > > Then, the method showMessageDialog, coded in Java, in my activity: > > > > [CODE] > > public void showMessageDialog(String pMsg) > > { > > Log.i("Vg", "Create dialog with message " + pMsg); > > Log.i("Vg", "Show dialog"); > > runOnUiThread( > > new Runnable () { > > public void run () { > > AlertDialog.Builder lAlertBox = new > > AlertDialog.Builder(this); > > TextView lTextView = new TextView(MyActivity.this); > > lTextView.setText(mMessage); > > lAlertBox.setView(lTextView); > > lAlertBox.setNeutralButton("Ok", MyActivity.this); > > lAlertBox.setOnCancelListener(MyActivity.this); > > lAlertBox.show(); > > } > > } > > );} > > > > [/CODE] > > > > I thought this would work, but it doesn't. What am I doing wrong ? > > > > Thanks > > Florent. > > -- > You received this message because you are subscribed to the Google > Groups "Android Developers" group. > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to > [email protected]<android-developers%[email protected]> > For more options, visit this group at > http://groups.google.com/group/android-developers?hl=en -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
