Fragment的OnResume方法：显示时候即刷新：setUserVisibleHint，onHiddenChanged

最新推荐文章于 2024-03-08 23:38:41 发布

原创最新推荐文章于 2024-03-08 23:38:41 发布 · 458 阅读

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本文介绍了一种在组件可见状态改变时更新UI显示的方法。通过重写onHiddenChanged及setUserVisibleHint方法，在组件变为可见时从数据库中查询书签、高亮和笔记的数量，并更新UI上的显示。

onHiddenChanged

setUserVisibleHint

onHiddenChanged

public void onHiddenChanged(boolean hidden) {
    super.onHiddenChanged(hidden);
    if (!hidden){
        List<BibleBookmarks> mBibleBookmarks = DBManager.getInstance(getActivity()).queryBibleBookmarks();
        String BookmarkCount=mBibleBookmarks.size()+"";
        mTvBookmarkCount.setText(BookmarkCount);
        List<BibleBookLight> mBibleBookLights = DBManager_Light.getInstance(getActivity()).queryBibleBookLight();
        String HightlightCount=mBibleBookLights.size()+"";
        mTvHightlightCount.setText(HightlightCount);
        List<BibleBookNote> mBibleBookNote = DBManager_Note.getInstance(getActivity()).queryBibleBookNote();
        String NoteCount=mBibleBookNote.size()+"";
        mTvNoteCount.setText(NoteCount);
    }
}

setUserVisibleHint

@Override
public void setUserVisibleHint(boolean isVisibleToUser) {
    super.setUserVisibleHint(isVisibleToUser);
    if (isVisibleToUser){
        List<BibleBookmarks> mBibleBookmarks = DBManager.getInstance(getActivity()).queryBibleBookmarks();
        String BookmarkCount=mBibleBookmarks.size()+"";
        mTvBookmarkCount.setText(BookmarkCount);
        List<BibleBookLight> mBibleBookLights = DBManager_Light.getInstance(getActivity()).queryBibleBookLight();
        String HightlightCount=mBibleBookLights.size()+"";
        mTvHightlightCount.setText(HightlightCount);
        List<BibleBookNote> mBibleBookNote = DBManager_Note.getInstance(getActivity()).queryBibleBookNote();
        String NoteCount=mBibleBookNote.size()+"";
        mTvNoteCount.setText(NoteCount);
    }
}

这两个总会有一个惯用的，你自己试试。原理是显示即刷新。