在ListView中搜索并使用片段布局,可以通过以下步骤实现:
以下是一个示例代码:
// 自定义Adapter类
public class MyAdapter extends BaseAdapter implements Filterable {
private List<String> data; // ListView的数据
private List<String> filteredData; // 过滤后的数据
private LayoutInflater inflater;
private Filter filter;
public MyAdapter(Context context, List<String> data) {
this.data = data;
this.filteredData = data;
inflater = LayoutInflater.from(context);
filter = new MyFilter();
}
@Override
public int getCount() {
return filteredData.size();
}
@Override
public Object getItem(int position) {
return filteredData.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = inflater.inflate(R.layout.fragment_layout, parent, false);
holder = new ViewHolder();
holder.textView = convertView.findViewById(R.id.text_view);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
String item = filteredData.get(position);
holder.textView.setText(item);
return convertView;
}
@Override
public Filter getFilter() {
return filter;
}
private static class ViewHolder {
TextView textView;
}
private class MyFilter extends Filter {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults results = new FilterResults();
List<String> filteredList = new ArrayList<>();
if (constraint == null || constraint.length() == 0) {
filteredList.addAll(data);
} else {
String filterPattern = constraint.toString().toLowerCase().trim();
for (String item : data) {
if (item.toLowerCase().contains(filterPattern)) {
filteredList.add(item);
}
}
}
results.values = filteredList;
results.count = filteredList.size();
return results;
}
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
filteredData = (List<String>) results.values;
notifyDataSetChanged();
}
}
}
// 在Activity或Fragment中使用Adapter和ListView
public class MainActivity extends AppCompatActivity {
private ListView listView;
private EditText searchEditText;
private MyAdapter adapter;
private List<String> dataList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = findViewById(R.id.list_view);
searchEditText = findViewById(R.id.search_edit_text);
// 初始化数据
dataList = new ArrayList<>();
dataList.add("Apple");
dataList.add("Banana");
dataList.add("Orange");
dataList.add("Watermelon");
// 实例化Adapter
adapter = new MyAdapter(this, dataList);
// 设置Adapter
listView.setAdapter(adapter);
// 设置搜索框的文本监听器
searchEditText.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void afterTextChanged(Editable s) {
// 调用过滤器的filter方法,传入搜索关键字
adapter.getFilter().filter(s.toString());
}
});
}
}
在这个示例中,我们创建了一个包含ListView和搜索框的Activity,并使用自定义的Adapter来管理ListView的数据和视图。在Adapter中,我们实现了一个过滤器类,用于根据搜索关键字对数据进行过滤。在Activity中,我们通过监听搜索框的文本变化,调用过滤器的filter方法来更新ListView的显示。
这样,当用户在搜索框中输入关键字时,ListView会根据关键字进行过滤,并显示过滤后的结果。
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