Display toast message on android through jni call

Question

I have followed this tutorial to launch a url on android through jni call. It runs successfully.
In the same way I want to display a toast message from my cocos2dx layer like this:

public static void openURL(String url) {
  Toast.makeText(me,url,Toast.LENGTH_LONG).show();
}

But its crashing with error: Can't create handler with thread. Do you know how can I display it correctly?

maybe [this post](http://stackoverflow.com/questions/3614663/cant-create-handler-inside-thread-that-has-not-called-looper-prepare-inside-a) could help you. — cosmincalistru, Jul 23 '12 at 07:22

score 2 · Answer 1 · answered Apr 24 '13 at 07:19

Try below code this will definately work for you.

First Create one Runnable interface in your class file like this,

Runnable runnable = new Runnable() {    

@Override

public void run() {
 // TODO Auto-generated method stub
Toast.makeText(MainActivity.this, "Your url string...",Toast.LENGTH_SHORT).show();
}};

Then create one Handler object and call that runnable interface like below,

Create Handler object like,

Handler handler;

initialize it like,

onCreate(){
    .................
    handler = new Handler();
    .................
}

then call runnable whenever you want like,

handler.post(runnable);

score 0 · Answer 2 · answered Jul 23 '12 at 08:09

0

You can't run UI stuffs on a background thread. You should use an AsyncTask and put that code in the on pre/post execute or if your just displaying a toast you can run it on the UI thread

runOnUiThread(new Runnable() {
}

answered Jul 23 '12 at 08:09

Slickelito

1,786
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28

score 0 · Answer 3 · answered Jan 08 '16 at 00:29

So this was from 2012.

I guess not a lot people use cocos2d-x. Ok this how you do this on cocos2d-x.

Edit the AppActivity.java

    public class AppActivity extends Cocos2dxActivity
    {
    private Activity activity;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        this.activity = this;
        showToast();
    }

    public void showToast()
    {
        activity.runOnUiThread(new Runnable()
        {

            @Override
            public void run()
            {
                // TODO Auto-generated method stub
                Toast.makeText(activity, "Hello :D", 10).show();
            }
        });
    }

    }

This works very nice in cocos2d-x version 3.x I test it. Of course JNI just will call the method and this must work.

Display toast message on android through jni call

3 Answers3