GLSurfaceView黑屏问题解决

最新推荐文章于 2023-10-18 16:23:07 发布

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最新推荐文章于 2023-10-18 16:23:07 发布 · 3.7k 阅读

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CC 4.0 BY-SA版权

文章标签：

#android #opengl

本文深入探讨了GLSurfaceView在切换应用前后台时出现短暂黑屏的问题，分析了其背后的工作机制，并提供了解决方案。通过重写onWindowVisibilityChanged方法，避免了资源回收导致的黑屏现象。

问题列表

打开其他页面返回当前页面 GLSurfaceView会有短暂黑屏
按HOME键回到后台再切换回来 GLSurfaceView会有短暂黑屏

分析

以上问题总结下就是回到后台后再切换到前台， GLSurfaceView会有短暂黑屏

提出问题

1.GLSurfaceView 回到后台做了什么

2.GLSurfaceView 回到前台做了什么

GLSurfaceView 回到后台以及前台，那么关注onWindowVisibilityChanged 就可以了，我们看下相关源码

@Override
 protected void onWindowVisibilityChanged(int visibility) {
     super.onWindowVisibilityChanged(visibility);
     mWindowVisibility = visibility == VISIBLE;
     mRequestedVisible = mWindowVisibility && mViewVisibility;
     updateWindow(false, false);
 }
 
 protected void updateWindow(boolean force, boolean redrawNeeded) {
     if (!mHaveFrame) {
         return;
     }
     ViewRootImpl viewRoot = getViewRootImpl();
     if (viewRoot != null) {
         mTranslator = viewRoot.mTranslator;
     }

     if (mTranslator != null) {
         mSurface.setCompatibilityTranslator(mTranslator);
     }

     int myWidth = mRequestedWidth;
     if (myWidth <= 0) myWidth = getWidth();
     int myHeight = mRequestedHeight;
     if (myHeight <= 0) myHeight = getHeight();

     getLocationInWindow(mLocation);
     final boolean creating = mWindow == null;
     final boolean formatChanged = mFormat != mRequestedFormat;
     final boolean sizeChanged = mWidth != myWidth || mHeight != myHeight;
     final boolean visibleChanged = mVisible != mRequestedVisible;

     if (force || creating || formatChanged || sizeChanged || visibleChanged
         || mLeft != mLocation[0] || mTop != mLocation[1]
         || mUpdateWindowNeeded || mReportDrawNeeded || redrawNeeded) {

         if (DEBUG) Log.i(TAG, "Changes: creating=" + creating
                 + " format=" + formatChanged + " size=" + sizeChanged
                 + " visible=" + visibleChanged
                 + " left=" + (mLeft != mLocation[0])
                 + " top=" + (mTop != mLocation[1]));

         try {
             final boolean visible = mVisible = mRequestedVisible;