有关Android导览(Android Navigation component)
文章目录
- 小结
- 有关Android导览(Android Navigation component)
- 碰到的问题
- 参考
小结
在使用Android导览(Android Navigation component)碰到很多问题。解决了一些问题，但是“Skipped xxx frames! The application may be doing too much work on its main thread”这样的的问题一直没有解决。
有关Android导览(Android Navigation component)
参考Android Developer: Migrate to the Navigation component: Migrate to the Navigation component 和
Android Developer: Get started with the Navigation component，可以创建navigation graph方便地对Fragment进行管理。
碰到的问题
-
NavController cannot find an ID
Caused by: java.lang.IllegalArgumentException: ID does not reference a View inside this Activity -
java.lang.IllegalArgumentException: ID未引用此活动中的视图
-
xxx does not have a NavController set on xxx
对于碰到的以上的问题，都差不多，是获取Controller时的出现的问题，参考Android开发 报错: xxx does not have a NavController set on xxx，以下代码可以解决：
@Overrideprotected void onStart() {super.onStart();mController = Navigation.findNavController(MainActivity.this, R.id.nav_host_fragment);}
或者：
public void navigate(@IdRes int resId, @Nullable Bundle args) {try {navHostFragment = (NavHostFragment) getSupportFragmentManager().findFragmentById(R.id.nav_host_fragment);mController = navHostFragment.getNavController();mController.navigate(resId, args);} catch (IllegalStateException | IllegalArgumentException ex) {Log.e(TAG_NAV, String.format("Unable to navigate to destination. %s", ex.getMessage()));}}
对于以下碰到的问题始终没有解决：
- Skipped xxx frames! The application may be doing too much work on its main thread
一种说法是创建多线程或者异步任务可以解决，但是试了一下好像不行。
另一种说法是Android应用运行时图片资源过大加载导致处理不过来。
- mdpi = 1x
- hdpi = 1.5x
- xhdpi = 2x
- xxhdpi = 3x
- xxxhdpi = 4x
其中drawable-nodpi是不会进行缩放的，结果试了这种办法也是不行。
创建一个新的分辨率的资源如下：
yourprojectname->app->src->main->res-> New->Image Asset-> select your resolution image required
参考
Android Developer: Migrate to the Navigation component: Migrate to the Navigation component
Android Developer: Get started with the Navigation component
Stackoverflow: Why does my NavController cannot find an ID that I already have?
找不到.findNavController()的正确上下文
Android开发 报错: xxx does not have a NavController set on xxx
Stackoverflow: The application may be doing too much work on its main thread
13、主线程任务太多导致异常退出（The application may be doing too much work on its main thread）
Stackoverflow: Will a density qualified drawable folder or drawable-nodpi take precedence?