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I have an Activity, and in that I have a class. text=new Dynamictext(...); text.setText("txt"); in my DynamicText java I have this code: public void setText(String text) { this.text=text; new asyncCreateText().execute(); //this.createText(text); } //private Handler handler = new Handler(); private class asyncCreateText extends AsyncTask<Void, Void, Void> { @Override protected Void doInBackground(Void... unused) { return null; } @Override protected void onPostExecute(Void unused) { } } I get: ERROR/AndroidRuntime(5176): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare() How can I handle this error? ERROR/AndroidRuntime(5370): java.lang.ExceptionInInitializerError ERROR/AndroidRuntime(5370): at com.l.start.DynamicText.setText(DynamicText.java:125) ERROR/AndroidRuntime(5370): at com.l.start.OpenGLRenderer.initfonts(OpenGLRenderer.java:168) ERROR/AndroidRuntime(5370): at com.l.start.OpenGLRenderer.init(OpenGLRenderer.java:119) ERROR/AndroidRuntime(5370): at com.l.start.OpenGLRenderer.onSurfaceChanged(OpenGLRenderer.java:90) ERROR/AndroidRuntime(5370): at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1120) ERROR/AndroidRuntime(5370): at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:975) ERROR/AndroidRuntime(5370): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare() ERROR/AndroidRuntime(5370): at android.os.Handler.<init>(Handler.java:121) ERROR/AndroidRuntime(5370): at android.os.AsyncTask$InternalHandler.<init>(AsyncTask.java:421) ERROR/AndroidRuntime(5370): at android.os.AsyncTask$InternalHandler.<init>(AsyncTask.java:421) ERROR/Andro

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