Android label black rect after jni call

cocos2d-x C++
#1

MyGame is built with cocos2dx 2.2.6 and I’m having a process in java when calling C++ delegate using jni and trying to update label string it become a black rect even if I’m calling the delegate within android ui thread.
What I usually do to make it work is to make a CCCallFunc and then runAction

 CCCallFunc* func = CCCallFunc::create(this, callfunc_selector(MyLayer::updateProgress));
 this->runAction(func);

However it’s repeated case and I have to edit many places is there any better way to get it done?

Screenshot_1550741407

#2

You should call C++ code from OpenGL thread.

Cocos2dxHelper.runOnGLThread(new Runnable() {
                            @Override
                            public void run() {
                                // put your call to C++ here
                            }
                        });
#3

Thank you @dimon4eg runOnGLThread is a member of Cocos2dxHelperListener How can I use it?

#4

add
import org.cocos2dx.lib.Cocos2dxHelper;

#5

I did that however I’m getting error cannot resolve method runOnGLThread I see that it is declared under Cocos2dxHelperListener not Cocos2dxHelper so shall I implement this listener in my java code?

#6

I find out that we can do so using Cocos2dxActivity I will try it thank you

#7

Thank you so much this work for me. You made my day :+1:

Cocos2dxActivity main = (Cocos2dxActivity) MyApplication.getCurrentAcivity();
main.runOnGLThread(new Runnable() {
     @Override
      public void run() {
            // put your call to C++ here
             }
         });
#8

Glad to help you :wink:

1 Like
#9

I forgot to mention that I’m using cocos2dx 2.2.6. but current activity become null when app in background. so I will never getting my delegate called if the app in background. rather than I have to edit Cocos2dxHelper.java and add the needed method as

public static void runOnGLThread(final Runnable r) {
    Cocos2dxHelper.sCocos2dxHelperListener.runOnGLThread(r);
}
#10

@dimon4eg This Solve the problem when the app in foreground. But I still have the same issue if the delegate called when the app in background even if it is called from GLThread. Do you have any suggestion?

#11

I don’t know why activity becomes null in cocos2dx 2.2.6.
But why do you need to call something in background?

#12

It is a download process and I’m updating progress and other buttons depending on the state. For the currentActivity it is not a problem. I found similar issue in cocos2dx v3. I will check if I could apply the changes to cocos2dx 2. Thanks for your time.

#13

I’m using CCLabelTTF. The structure is so different in v3. I can’t solve this.

#14

can you check is your app is background then mark some flag. After app goes to foreground check the flag and call that code.
Maybe this will fix your issue.

#15

Problem solved by performFunctionInCocosThread:

  1. Updating CCScheduler.h
  2. Updateding CCScheduler.cpp
  3. Calling my delegate within
    CCDirector::sharedDirector()->getScheduler() ->performFunctionInCocosThread([=]() { // Call delegate her });
#16

Is that the one by sonarsystems?