I'm new here and i'm also new to android..
I'm using ImageTarget sample to edit in, I want to change the action after recognized the tracker to open browser in a certain url.. so I want to put this code:
String upc = "http://www.example.com";
Uri uri = Uri.parse(upc);
Intent intent = new Intent(Intent.ACTION_VIEW, uri);
startActivity(intent);but I don't know where I've to put this code?
any help??
Hello,
Please see my reply to your other post about putting text on a 3D plane, https://ar.qualcomm.at/content/how-change-teapot-text-vuforia-native . My code in this post will show a toast when a target is detected, i.e. 2D text on the screen not tracking to target. Just remove the code to open the URI in order to stop the web browser from opening.
Thank you,
-Peter
Hello davina,
My code is only to replace a portion of the code in ImageTargets.cpp. Those errors look like you may have replaced all the code with my code.
You need to leave most of the ImageTargets.cpp file in tact and only replace the relevant parts with my code.
Thank you,
-Peter
I want to show transparent activity over android camera, after detecting marker, i send the message to android activity, here below my code is attached, any help would be helpful a lot. Thanks
int lastTrackableId = -1;
JNIEXPORT void JNICALL
Java_com_qualcomm_QCARSamples_FrameMarkers_FrameMarkersRenderer_renderFrame(JNIEnv * env, jobject obj)
{
//LOG("Java_com_qualcomm_QCARSamples_FrameMarkers_GLRenderer_renderFrame");
// Clear color and depth buffer
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// Get the state from QCAR and mark the beginning of a rendering section
QCAR::State state = QCAR::Renderer::getInstance().begin();
// Explicitly render the Video Background
QCAR::Renderer::getInstance().drawVideoBackground();
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
// Did we find any trackables this frame?
for(int tIdx = 0; tIdx < state.getNumActiveTrackables(); tIdx++)
{
// Get the trackable:
const QCAR::Trackable* trackable = state.getActiveTrackable(tIdx);
// Compare this trackable's id to a globally stored id
// If this is a new trackable, find the displayMessage java method and
// call it with the trackable's name
if (trackable->getId() != lastTrackableId) {
jstring js = env->NewStringUTF(trackable->getName());
jclass javaClass = env->GetObjectClass(obj);
jmethodID method = env->GetMethodID(javaClass, "displayMessage", "(Ljava/lang/String;)V");
env->CallVoidMethod(obj, method, js);
lastTrackableId = trackable->getId();
}
QCAR::Renderer::getInstance().end();
}
QCAR::Renderer::getInstance().end();
}Hello Peter,
first i'm sorry for being late in this reply but I had some personal issues which delayed me...second thanks a lot for your help it works great for me but i faced a new issue i need your help in, which is: when the camera detect the tracker the video works but if i go back and try to detect it again nothing happen. but if i detected another tracker image it works...
conclusion: i can't detect the same image tracker twice in row...thanks
Hi
I had this same issue.
to pass trought it, i wrote a simple Method JNI on cpp that restarts "lastTrackableId" to -1
Easy and tell me how did you go
Hello Peter,
first i'm sorry for being late in this reply but I had some personal issues which delayed me...
second thanks a lot for your help it works great for me but i faced a new issue i need your help in, which is: when the camera detect the tracker the video works but if i go back and try to detect it again nothing happen. but if i detected another tracker image it works...
conclusion: i can't detect the same image tracker twice in row...
thanks
and if I update the ImageTarget.java like this:
/** Called when the activity will start interacting with the user.*/
protected void onResume()
{
ImageTargetsRenderer.mainActivityHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
String text = (String) msg.obj;
// The Toast display the name of the detected trackable on the screen
Context context = getApplicationContext();
int duration = Toast.LENGTH_SHORT;
Toast toast = Toast.makeText(context, text, duration);
toast.show();
// The following opens a pre-defined URL based on the name of trackable detected
if (text.equalsIgnoreCase("stones")) {
Uri uriUrl = Uri.parse("http://ar.qualcomm.at");
Intent launchBrowser = new Intent(Intent.ACTION_VIEW, uriUrl);
startActivity(launchBrowser);
}
if (text.equalsIgnoreCase("chips")) {
Uri uriUrl = Uri.parse("http://developer.qualcomm.com");
Intent launchBrowser = new Intent(Intent.ACTION_VIEW, uriUrl);
startActivity(launchBrowser);
}
}
};
}
the app crashes...
more help please..
Hello mohamedepic,
Here are the step to do this and also display a Toast of which trackable is found:
1. Update ImageTargets.cpp as follows
int lastTrackableId = -1;
JNIEXPORT void JNICALL
Java_com_qualcomm_QCARSamples_ImageTargets_ImageTargetsRenderer_renderFrame(JNIEnv* env, jobject obj)
{
...
// Did we find any trackables this frame?
for(int tIdx = 0; tIdx < state.getNumActiveTrackables(); tIdx++)
{
// Get the trackable:
const QCAR::Trackable* trackable = state.getActiveTrackable(tIdx);
// Compare this trackable's id to a globally stored id
// If this is a new trackable, find the displayMessage java method and
// call it with the trackable's name
if (trackable->getId() != lastTrackableId) {
jstring js = env->NewStringUTF(trackable->getName());
jclass javaClass = env->GetObjectClass(obj);
jmethodID method = env->GetMethodID(javaClass, "displayMessage", "(Ljava/lang/String;)V");
env->CallVoidMethod(obj, method, js);
lastTrackableId = trackable->getId();
}
QCAR::Renderer::getInstance().end();
}
2. Update ImageTargetsRenderer.java as follows
public void displayMessage(String text)
{
// We use a handler because this thread cannot change the UI
Message message = new Message();
message.obj = text;
mainActivityHandler.sendMessage(message);
}
3. Add the Handler to resolve the error in ImageTargetsrenderer.java. At the beginning of the class definition add.
public static Handler mainActivityHandler;
4. Add the Handler to ImageTargets.java in the onResume() Method
ImageTargetsRenderer.mainActivityHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
String text = (String) msg.obj;
// The Toast display the name of the detected trackable on the screen
Context context = getApplicationContext();
int duration = Toast.LENGTH_SHORT;
Toast toast = Toast.makeText(context, text, duration);
toast.show();
// The following opens a pre-defined URL based on the name of trackable detected
if (text.equalsIgnoreCase("stones")) {
Uri uriUrl = Uri.parse("http://ar.qualcomm.at");
Intent launchBrowser = new Intent(Intent.ACTION_VIEW, uriUrl);
startActivity(launchBrowser);
}
if (text.equalsIgnoreCase("chips")) {
Uri uriUrl = Uri.parse("http://developer.qualcomm.com");
Intent launchBrowser = new Intent(Intent.ACTION_VIEW, uriUrl);
startActivity(launchBrowser);
}
}
};
Thank you,
-Peter
Hi.. I am trying to achieve the same and I am able to open a web browser but when I come back to the app the tracker is not recognized..m i missing something..following is my rederfame function:
JNIEXPORT void JNICALL Java_com_qualcomm_QCARSamples_ImageTargets_ImageTargetsRenderer_renderFrame(JNIEnv* env, jobject obj) { //LOG("Java_com_qualcomm_QCARSamples_ImageTargets_GLRenderer_renderFrame"); // Clear color and depth buffer glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Get the state from QCAR and mark the beginning of a rendering section QCAR::State state = QCAR::Renderer::getInstance().begin(); // Explicitly render the Video Background QCAR::Renderer::getInstance().drawVideoBackground(); #ifdef USE_OPENGL_ES_1_1 // Set GL11 flags: glEnableClientState(GL_VERTEX_ARRAY); glEnableClientState(GL_NORMAL_ARRAY); glEnableClientState(GL_TEXTURE_COORD_ARRAY); glEnable(GL_TEXTURE_2D); glDisable(GL_LIGHTING); #endif glEnable(GL_DEPTH_TEST); glEnable(GL_CULL_FACE); // Did we find any trackables this frame? for(int tIdx = 0; tIdx < state.getNumActiveTrackables(); tIdx++) { // Get the trackable: const QCAR::Trackable* trackable = state.getActiveTrackable(tIdx); // Compare this trackable's id to a globally stored id // If this is a new trackable, find the displayMessage java method and // call it with the trackable's name if (trackable->getId() != lastTrackableId) { jstring js = env->NewStringUTF(trackable->getName()); jclass javaClass = env->GetObjectClass(obj); jmethodID method = env->GetMethodID(javaClass, "displayMessage", "(Ljava/lang/String;)V"); env->CallVoidMethod(obj, method, js); lastTrackableId = trackable->getId(); } } glDisable(GL_DEPTH_TEST); #ifdef USE_OPENGL_ES_1_1 glDisable(GL_TEXTURE_2D); glDisableClientState(GL_VERTEX_ARRAY); glDisableClientState(GL_NORMAL_ARRAY); glDisableClientState(GL_TEXTURE_COORD_ARRAY); #else glDisableVertexAttribArray(vertexHandle); glDisableVertexAttribArray(normalHandle); glDisableVertexAttribArray(textureCoordHandle); #endif QCAR::Renderer::getInstance().end(); }