要對(duì)Android ListView進(jìn)行排序,需要按照特定的規(guī)則對(duì)列表中的數(shù)據(jù)進(jìn)行排序,然后更新ListView的顯示。
下面是一個(gè)示例,展示如何對(duì)ListView中的數(shù)據(jù)進(jìn)行排序。
public class MyAdapter extends ArrayAdapter<String> {
private List<String> data;
public MyAdapter(Context context, int resource, List<String> objects) {
super(context, resource, objects);
this.data = objects;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// 獲取ListView中的每個(gè)項(xiàng)的視圖
View view = convertView;
if (view == null) {
LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(android.R.layout.simple_list_item_1, null);
}
// 獲取數(shù)據(jù)項(xiàng)并顯示在視圖中
String item = data.get(position);
TextView textView = view.findViewById(android.R.id.text1);
textView.setText(item);
return view;
}
}
public class MainActivity extends AppCompatActivity {
private ListView listView;
private MyAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = findViewById(R.id.listView);
// 創(chuàng)建數(shù)據(jù)列表
List<String> data = new ArrayList<>();
data.add("Item 1");
data.add("Item 2");
data.add("Item 3");
// 創(chuàng)建適配器
adapter = new MyAdapter(this, android.R.layout.simple_list_item_1, data);
// 設(shè)置適配器
listView.setAdapter(adapter);
}
}
// 創(chuàng)建數(shù)據(jù)列表
List<String> data = new ArrayList<>();
data.add("Item 3");
data.add("Item 1");
data.add("Item 2");
// 更新數(shù)據(jù)列表
adapter.clear();
adapter.addAll(data);
// 通知適配器數(shù)據(jù)已更改
adapter.notifyDataSetChanged();
這樣,ListView中的數(shù)據(jù)就會(huì)按照新的順序進(jìn)行排序并更新顯示。