the content of the adapter has changed but listview did not

改进后的列表项删除代码示例

最新推荐文章于 2025-09-05 16:58:34 发布

转载最新推荐文章于 2025-09-05 16:58:34 发布 · 63 阅读

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#php #移动开发

本文提供了两个实现列表项删除功能的Android代码示例，一个为原始代码，另一个进行了优化，使得每次点击列表项即可删除对应选项。示例包括创建列表视图、加载数据源、设置适配器，并在列表项被点击时调用remove方法进行删除操作。

http://dev.10086.cn/cmdn/wiki/index.php?doc-view-5432.html高手文章，要分享

这是我原来的代码

public class FileDeleteActivity extends ListActivity {
/** Called when the activity is first created. */
ArrayList<String> listStr=new ArrayList<String>();
private Handler handler=null;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        final ListView list=new ListView(this);
        listStr=getDataSource();
        Adapter adapter=new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, listStr);
        list.setAdapter(adapter);
        setListAdapter(adapter);

}

    private ArrayList<String> getDataSource(){
    ArrayList<String> source=new ArrayList<String>();
    source.add("11");
    source.add("aa");
    source.add("Aa");
    source.add("EE");
    source.add("--23");
    return source;
    }

    @Override
    protected void onListItemClick(ListView l, View v, int position, long id){
    listStr.remove(position);
     super.onListItemClick(l, v, position, id);
    }
}

这是我修改之后的代码：目的，每次点击之后就删除该选项

public class FileDeleteActivity extends ListActivity {
    /** Called when the activity is first created. */
ArrayList<String> listStr=new ArrayList<String>();
private Handler handler=null;
private ArrayAdapter<String> adapter=null;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        final ListView list=new ListView(this);
        listStr=getDataSource();
        adapter=new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, listStr);
        list.setAdapter(adapter);
        setListAdapter(adapter);

}

    private ArrayList<String> getDataSource(){
    ArrayList<String> source=new ArrayList<String>();
    source.add("11");
    source.add("aa");
    source.add("Aa");
    source.add("EE");
    source.add("--23");
    return source;
    }

    @Override
    protected void onListItemClick(ListView l, View v, int position, long id){
    listStr.remove(position);
    adapter.notifyDataSetChanged();//更新一下就行了
     super.onListItemClick(l, v, position, id);
    }
}