在GLSurfaceView中的onResume()之后重新加载opengl纹理

public class MyGLSurfaceView extends GLSurfaceView {
    private MyGLRenderer mRenderer;

    public MyGLSurfaceView(Context context) {
        super(context);
        setEGLContextClientVersion(2);
        mRenderer = new MyGLRenderer();
        setRenderer(mRenderer);
    }

    @Override
    public void onResume() {
        super.onResume();
        mRenderer.onResume();
    }

    @Override
    public void onPause() {
        super.onPause();
        mRenderer.onPause();
    }

    private class MyGLRenderer implements GLSurfaceView.Renderer {
        private int mTexture;

        public void onResume() {
            // 重新初始化OpenGL ES环境和资源
            GLES20.glGenTextures(1, new int[]{mTexture}, 0);
            GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, mTexture);
            GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_NEAREST);
            GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_NEAREST);
            GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE);
            GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);
            // 加载纹理
            Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.texture);
            GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0, bitmap, 0);
            bitmap.recycle();
        }

        public void onPause() {
            // 释放资源
            GLES20.glDeleteTextures(1, new int[]{mTexture}, 0);
        }

        @Override
        public void onSurfaceCreated(GL10 gl, EGLConfig config) {
            GLES20.glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
        }

        @Override
        public void onSurfaceChanged(GL10 gl, int width, int height) {
            GLES20.glViewport(0, 0, width, height);
            float ratio = (float) width / height;
            Matrix.frustumM(mProjectionMatrix, 0, -ratio, ratio, -1, 1, 3, 7);
        }

        @Override
        public void onDrawFrame(GL10 gl) {
            GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT | GLES20.GL_DEPTH_BUFFER_BIT);
            // 绘制纹理
            GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, mTexture);
            GLES20.glEnableVertexAttribArray(mPositionHandle);
            GLES20.glEnableVertexAttribArray(mTextureCoordHandle);
            GLES20.glVertexAttribPointer(mPositionHandle, 3, GLES20.GL_FLOAT, false, 0, mVertexBuffer);
            GLES20.glVertexAttribPointer(mTextureCoordHandle, 2, GLES20.GL_FLOAT, false, 0, mTextureCoordBuffer);
            GLES20.glDrawElements(GLES20.GL_TRIANGLES, 6, GLES20.GL_UNSIGNED_SHORT, mIndexBuffer);
            GLES20.glDisableVertexAttribArray(mPositionHandle);
            GLES20.glDisableVertexAttribArray(mTextureCoordHandle);
        }
    }
}