Why doesn't this code work to set up basic Android OpenGL?

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.in开发者_C百科ternal.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

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);
}

1) Your constructor for SampleSurfaceView does not match the name of the class.

2) You need to set the SurfaceView's Renderer before you set the ContentView.

Among other things, you don't ever seem to be using SampleSurfaceView. If you want to extend GLSurfaceView, you need to use that extended class. Switch your private GLSurfaceView and all instances of it to SampleSurfaceView. Currently your SampleSurfaceView class is never used.