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Asked: 2026-05-26T00:41:32+00:00

Hey I am trying to just set up the basic structure for some basic

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Hey I am trying to just set up the basic structure for some basic graphics. However, when I run this code the app makes me force quit on the emulator. I am using Android 2.3.

I used this website to get this far http://developer.android.com/resources/tutorials/opengl/opengl-es10.html

Please help. I am familiar with OpenGL just not for Android

public class SampleActivity extends Activity {
/** Called when the activity is first created. */
private GLSurfaceView mGLView;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    mGLView = new GLSurfaceView(this);     
    setContentView(mGLView);
}

@Override protected void onPause()
{
    super.onPause();
    mGLView.onPause();
}

@Override protected void onResume()
{
    super.onResume();
    mGLView.onResume();

}

   }

class SampleSurfaceView extends GLSurfaceView
{

public Sample2SurfaceView(Context context) {
    super(context);

    setRenderer(new SampleRenderer());
}

}

public class SampleRenderer implements GLSurfaceView.Renderer 
{
private FloatBuffer triangleVB;
public void onSurfaceCreated(GL10 gl, EGLConfig config)
{    
    gl.glClearColor(0.5f, 0.5f, 0.5f, 1.0f);
}       
public void onDrawFrame(GL10 gl)
{        // Redraw background color    
      gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);

    }    
public void onSurfaceChanged(GL10 gl, int width, int height)
{   
    gl.glViewport(0, 0, width, height);
    }

10-03 00:25:57.561: ERROR/AndroidRuntime(330): FATAL EXCEPTION: main
10-03 00:25:57.561: ERROR/AndroidRuntime(330): java.lang.RuntimeException: Unable to resume activity {android.SampleActivity}: java.lang.NullPointerException
10-03 00:25:57.561: ERROR/AndroidRuntime(330): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2120)
10-03 00:25:57.561: ERROR/AndroidRuntime(330): at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2135)
10-03 00:25:57.561: ERROR/AndroidRuntime(330): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1668)
10-03 00:25:57.561: ERROR/AndroidRuntime(330): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
10-03 00:25:57.561: ERROR/AndroidRuntime(330): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
10-03 00:25:57.561: ERROR/AndroidRuntime(330): at android.os.Handler.dispatchMessage(Handler.java:99)
10-03 00:25:57.561: ERROR/AndroidRuntime(330): at android.os.Looper.loop(Looper.java:123)
10-03 00:25:57.561: ERROR/AndroidRuntime(330): at android.app.ActivityThread.main(ActivityThread.java:3683)
10-03 00:25:57.561: ERROR/AndroidRuntime(330): at java.lang.reflect.Method.invokeNative(Native Method)
10-03 00:25:57.561: ERROR/AndroidRuntime(330): at java.lang.reflect.Method.invoke(Method.java:507)
10-03 00:25:57.561: ERROR/AndroidRuntime(330): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
10-03 00:25:57.561: ERROR/AndroidRuntime(330): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
10-03 00:25:57.561: ERROR/AndroidRuntime(330): at dalvik.system.NativeStart.main(Native Method)
10-03 00:25:57.561: ERROR/AndroidRuntime(330): Caused by: java.lang.NullPointerException
10-03 00:25:57.561: ERROR/AndroidRuntime(330): at android.opengl.GLSurfaceView.onResume(GLSurfaceView.java:512)
10-03 00:25:57.561: ERROR/AndroidRuntime(330): at android.TagToMobileAlbum.TagToMobileAlbumActivity.onResume(TagToMobileAlbumActivity.java:28)
10-03 00:25:57.561: ERROR/AndroidRuntime(330): at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1150)
10-03 00:25:57.561: ERROR/AndroidRuntime(330): at android.app.Activity.performResume(Activity.java:3832)
10-03 00:25:57.561: ERROR/AndroidRuntime(330): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2110)
10-03 00:25:57.561: ERROR/AndroidRuntime(330): … 12 more
10-03 00:34:05.661: ERROR/AndroidRuntime(340): FATAL EXCEPTION: main
10-03 00:34:05.661: ERROR/AndroidRuntime(340): java.lang.RuntimeException: Unable to resume activity {android.TagToMobileAlbum/android.TagToMobileAlbum.TagToMobileAlbumActivity}: java.lang.NullPointerException
10-03 00:34:05.661: ERROR/AndroidRuntime(340): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2120)
10-03 00:34:05.661: ERROR/AndroidRuntime(340): at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2135)
10-03 00:34:05.661: ERROR/AndroidRuntime(340): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1668)
10-03 00:34:05.661: ERROR/AndroidRuntime(340): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
10-03 00:34:05.661: ERROR/AndroidRuntime(340): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
10-03 00:34:05.661: ERROR/AndroidRuntime(340): at android.os.Handler.dispatchMessage(Handler.java:99)
10-03 00:34:05.661: ERROR/AndroidRuntime(340): at android.os.Looper.loop(Looper.java:123)
10-03 00:34:05.661: ERROR/AndroidRuntime(340): at android.app.ActivityThread.main(ActivityThread.java:3683)
10-03 00:34:05.661: ERROR/AndroidRuntime(340): at java.lang.reflect.Method.invokeNative(Native Method)
10-03 00:34:05.661: ERROR/AndroidRuntime(340): at java.lang.reflect.Method.invoke(Method.java:507)
10-03 00:34:05.661: ERROR/AndroidRuntime(340): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
10-03 00:34:05.661: ERROR/AndroidRuntime(340): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
10-03 00:34:05.661: ERROR/AndroidRuntime(340): at dalvik.system.NativeStart.main(Native Method)
10-03 00:34:05.661: ERROR/AndroidRuntime(340): Caused by: java.lang.NullPointerException
10-03 00:34:05.661: ERROR/AndroidRuntime(340): at android.opengl.GLSurfaceView.onResume(GLSurfaceView.java:512)
10-03 00:34:05.661: ERROR/AndroidRuntime(340): at android.SampleActivity.onResume(
SampleActivity.java:28)
10-03 00:34:05.661: ERROR/AndroidRuntime(340): at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1150)
10-03 00:34:05.661: ERROR/AndroidRuntime(340): at android.app.Activity.performResume(Activity.java:3832)
10-03 00:34:05.661: ERROR/AndroidRuntime(340): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2110)
10-03 00:34:05.661: ERROR/AndroidRuntime(340): … 12 more

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1 Answer

  1. Editorial Team

    I was having the same problem and, from looking at other sample code, managed to solve it. I’m not sure why it makes a difference but I moved the call to setRenderer into the Activity constructor and this seems to have solved the problem. So your onCreate would be something like:

    @Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    mGLView = new GLSurfaceView(this);
    mGLView.setRenderer(new SampleRenderer())
    setContentView(mGLView);
}
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