OpenGL, Android precautions NullPointer and androidnullpointer

OpenGL, Android precautions NullPointer and androidnullpointer

BUG:

Caused by: java. lang. IllegalStateException: setRenderer has already been called for this instance.

Or NullPointer Error

Solution:

Move setEGLContextClientVersion (2); to the front of setRenderer. "If this method is called, it must be called before"setRenderer(Renderer)Is called.
".

Expansion:

The call sequence before setRender () is also fixed. For details, see the code comments, as shown below:

This method shoshould be called once and only once in the life-cycle of a GLSurfaceView.

(These methods can only be included in CLSurfaceView and can only be called once)

The following GLSurfaceView methods can only be calledBeforeSetRenderer is called:

(Called before setRender, including setEGLContextClientVersion (2 ))

• setEGLConfigChooser(boolean)
• setEGLConfigChooser(EGLConfigChooser)
• setEGLConfigChooser(int, int, int, int, int, int)

The following GLSurfaceView methods can only be calledAfterSetRenderer is called:

(Called after setRender)

• getRenderMode()
• onPause()
• onResume()
• queueEvent(Runnable)
• requestRender()
• setRenderMode(int)