Android Adapter,UI界面更新

最新推荐文章于 2025-02-06 00:51:32 发布

原创最新推荐文章于 2025-02-06 00:51:32 发布 · 3.5k 阅读

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#arraylist #ui #android

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这篇博客探讨了在Android应用中更新UI界面的三种方法：1)使用广播处理器在MusicPlayerActivity和MusicAdapter中操作；2)通过onStart()和onResume()生命周期方法在StuMainActivity和StudentAdapter中更新；3)利用Handler在FSPointActivity和PointsAdapter中实现UI刷新。

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Android Adapter,UI界面更新方法:
(广播处理器,普通方法onstart()和onresume(),handler中更新UI)

1:广播处理器
MusicPlayerActivity:

ArrayList<Music> musics = new MusicBiz(MusicPlayerActivity.this).getLocalMusics();
    app.setMusics(musics);// 更新共享的播放列表数据,更新数据.
    adapter.changeDataSet(musics);// 更新界面

MusicAdapter:

public void setMusics(ArrayList<Music> musics) {
        if (musics != null)
            this.musics = musics;
        else
            this.musics = new ArrayList<Music>();
    }
    public void changeDataSet(ArrayList<Music> musics) {
        this.setMusics(musics);
        this.notifyDataSetChanged();
    }

2:普通方法onstart()和onresume()
StuMainActivity:

protected void onResume() {
        String order = pref.getString("pref_key_sort_col", "_id");
        adapter.changeDataSet(biz.getStudents(order));
    }

StudentAdapter:

public void setStudents(ArrayList<Student> students) {
        if (students != null)
            this.students = students;
        else
            this.students = new ArrayList<Student>();
    }
public void changeDataSet(ArrayList<Student> students) {
        this.setStudents(students);
        this.notifyDataSetChanged();
    }

3:handler中更新UI
FSPointActivity handler中:

ckb = (CustomKeywordsBean) msg.obj;
    keywords = ckb.getKeywords();
    adapter.dateChanged(keywords);

PointsAdapter:

public void setKeywords(ArrayList<CustomKeyword> keywords) {
        if (keywords != null) {
            this.keywords = keywords;
        } else {
            this.keywords = new ArrayList<CustomKeyword>();
        }
    }
public void dateChanged(ArrayList<CustomKeyword> keywords) {
        this.setKeywords(keywords);
        this.notifyDataSetChanged();
    }