Question

我正在开发一个小的OpenGL Activity，它由这个布局组成：

<RelativeLayout  
                android:id="@+id/vt_layout_opengl"
                android:orientation="horizontal" 
                android:layout_width="wrap_content" 
                android:layout_height="wrap_content"
                android:visibility="gone"


        >

            <android.opengl.GLSurfaceView
                    android:id="@+id/surface_vt"
                    android:layout_width="900dp" 
                    android:layout_height="285dp"

            />   

            <RelativeLayout
                    android:layout_width="fill_parent" 
                    android:layout_height="fill_parent"
                    android:layout_below="@id/surface_vt"
                    android:layout_marginTop="5dp"
                    android:background="@drawable/barra_menu_vt"

                  >

                    <ImageButton android:id="@+id/vt_left_arrow" 
                                 android:layout_width="wrap_content" 
                                 android:layout_height="wrap_content"
                                 android:layout_alignParentLeft="true"
                                 android:layout_marginLeft="20dp"
                                 android:background="@drawable/prev_a"
                                 android:onClick="prec"

                    />
                    <ImageButton android:id="@+id/vt_right_arrow" 
                                 android:layout_width="wrap_content" 
                                 android:layout_height="wrap_content"
                                 android:background="@drawable/next_a"
                                 android:layout_toRightOf="@+id/vt_left_arrow"
                                 android:layout_marginLeft="20dp"
                                 android:onClick="next"
                    />
                    <TextView
                        android:id="@+id/vt_description" 
                        android:layout_width="wrap_content" 
                        android:layout_height="wrap_content"
                        android:layout_toRightOf="@+id/vt_right_arrow"
                        android:layout_marginLeft="30dp"
                        android:maxLength="30"
                        android:singleLine="true"
                        android:ellipsize="marquee"
                    />

                    <ImageButton android:id="@+id/vt_information" 
                                 android:layout_width="wrap_content" 
                                 android:layout_height="wrap_content"
                                 android:layout_toLeftOf="@+id/vt_addbookmarks"
                                 android:layout_marginRight="20dp"
                                 android:background="@drawable/info_a"
                                 android:onClick="info"

                    />
                    <ImageButton android:id="@+id/vt_addbookmarks" 
                                 android:layout_width="wrap_content" 
                                 android:layout_height="wrap_content"
                                 android:layout_toLeftOf="@+id/vt_preferences"
                                 android:layout_marginRight="20dp"
                                 android:background="@drawable/book_a"
                                 android:onClick="bookmark"
                    />
                    <ImageButton android:id="@+id/vt_preferences" 
                                 android:layout_width="wrap_content" 
                                 android:layout_height="wrap_content"
                                 android:layout_alignParentRight="true"
                                 android:layout_marginRight="20dp"
                                 android:background="@drawable/sett_a"
                                 android:onClick="settings"
                    />




                </RelativeLayout>


        </RelativeLayout>

它显示了这样的视图：

enter image description here

但是当我按下主页按钮并返回我的应用程序时，我只能看到黑屏，GLSurfaceView和RelativeLayout都没有显示!!

约两分钟后系统说： enter image description here

我很沮丧，当我的Activity调用相应的方法时，我调用GLSurface onPause（）和onResume（）。

有人可以帮助我!! ????

我发布了一些代码：

@Override
    public void onCreate(Bundle savedInstanceState) {
    Log.d(TAG,"onCreate()");
        super.onCreate(savedInstanceState);
        setContentView(R.layout.virtualtour);
        loading_ly = (RelativeLayout) findViewById(R.id.vt_layout_loading);
        panorama_description = (TextView) findViewById(R.id.vt_description);
        virtualtour_relatively = (RelativeLayout) findViewById(R.id.vt_layout_opengl);
        vt_handler = new VirtualTourHandler(this);
        ext_container = new GLExtensionContainer();
        th_checkGL = new ThreadCheckOpenGL(ext_container, extensions_requested,vt_handler);
       th_checkGL.start();
        mFacebook = new Facebook(ArounderTouchMainActivity.APP_ID);
        mAsyncRunner = new AsyncFacebookRunner(mFacebook);
        msg = vt_handler.obtainMessage();
        output_thread =  msg.getData();
        output_thread.putInt(VirtualTour.TYPE_TAG, VirtualTour.START_TAG);
        vt_handler.handleMessage(msg);
      }

这是我的Handler内部类（当用户执行某些操作时，我将它用于切换纹理）

@Override
        public void handleMessage(Message msg) {


            bd = msg.getData();
            type = bd.getInt(TYPE_TAG);
            bd = msg.getData();

            switch (type) {
                case GL_EXTENSIONS_CHECK_TAG:
                    showDialog(GL_EXTENSIONS_CHECK_DIALOG);
                    break;
                case START_TAG:
                    Log.d(TAG, "START_TAG");
                    loading_ly.setVisibility(View.VISIBLE);
                    virtualtour_relatively.setVisibility(View.GONE);
                    progress_bar.setProgress(0);
                    thread = new DownloadImageProgressBar(vt_handler,getActivity());
                    thread.execute(panorama_input.get(position).getUrl_virtual());
                    break;
                case BAR_TAG:
                    progress = bd.getInt(PROGRESS_TAG);
                    if(progress <= 100)
                        progress_bar.setProgress(progress);
                    break;

                case SHUTDOWN_TAG:
                    finish();
                    break;
                case SHOW_TAG:
                Log.d(TAG, "SHOW_TAG");
                if(first_visualization){
                    glSurface = (GLSurfaceView) findViewById(R.id.surface_vt);
                    glSurface.setDebugFlags(GLSurfaceView.DEBUG_CHECK_GL_ERROR);
                    renderer = new OpenGLRenderer(first_data,second_data,sphere,vt_handler,ext_container, ( (panorama_input.get(position)).getType().compareTo(CardImage.SPHERE) == 0));
                    glSurface.setRenderer(renderer);
                    first_visualization = false;
                }
                // potrebbe essere fatto molto meglio: ricorda! 
                panorama_description.setText(panorama_input.get(position).getTitolo());
                loading_ly.setVisibility(View.GONE);
                virtualtour_relatively.setVisibility(View.VISIBLE);

                renderer.setImage(first_data, second_data,( (panorama_input.get(position)).getType().compareTo(CardImage.SPHERE) == 0));
                renderer.resetZoom();
                renderer.resetAngle();
                renderer.startTimer();  
                enable_touch = false;
                case NOCONNECTION_ERROR_TAG:
                    showDialog(OUTOFMEMORY_ERROR_DIALOG);
                    break;

                case OUTOFMEMORY_ERROR_TAG:
                    showDialog(OUTOFMEMORY_ERROR_DIALOG);
                    break;


                default:
                    break;
            }
            return;

        }


    }

DownloadImageProgressBar是一个AsyncTask，它从Web下载图像并通过Activity Handler执行一些UI操作。

有我的onPause和onResume方法：

 @Override
protected void onResume() {
    Log.d(TAG,"onResume()");
    super.onResume();
    if(glSurface != null)
        glSurface.onResume();
}

   @Override
protected void onPause() {
     Log.d(TAG,"onPause()");   
     super.onPause();
     glSurface.onPause();
}

我在onSurfaceChanged和onSurfaceCreated中调用此方法：

public void setGLTexture(GL10 gl10) {

        GL11 gl = (GL11) gl10;

        //Generate one texture pointer...
        gl.glGenTextures(2, textures_id);
        gl.glClearColor(0.2f, 0.2f, 0.2f, 1.0f);
        //...and bind it to our array
        gl.glBindTexture(GL10.GL_TEXTURE_2D, textures_id.get(0));
        gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_LINEAR);
        gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_LINEAR);
        gl.glTexParameterf( GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_S, GL10.GL_CLAMP_TO_EDGE );
        gl.glTexParameterf( GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_T, GL10.GL_CLAMP_TO_EDGE );
        GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, first, 0);
        gl.glBindTexture(GL10.GL_TEXTURE_2D, textures_id.get(1));
        gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_LINEAR);
        gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_LINEAR);
        gl.glTexParameterf( GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_S, GL10.GL_CLAMP_TO_EDGE );
        gl.glTexParameterf( GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_T, GL10.GL_CLAMP_TO_EDGE );
        GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, second, 0);
        return;
    }

我有另一个问题，当我的活动在后台切换我之前下载的纹理图像时会被删除吗？

这可能是问题吗？

Answer 1

按“主页”时，GL上下文将丢失。

来自Android文档：

有些情况下EGL 渲染上下文将丢失。这个通常在设备唤醒时发生睡觉后。当EGL 所有OpenGL资源都丢失了上下文（例如纹理）相关联有了这样的背景自动删除。为了保持正确渲染，一个渲染器必须重新创建任何丢失的资源它仍然需要。该 onSurfaceCreated（GL10，EGLConfig）方法是一个方便的地方此

您可以阅读here。

要解决此问题，请在渲染器的onSurfaceChanged中执行所有OpenGL纹理和初始化。

GLSurfaceView onPause仅显示黑屏

1 个答案: