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现在很多的app中都有搜索的功能。也就是说搜索栏下面有一个列表，列表中放的内容我们可以在搜索框中输入你想要搜索的内容，这时候，下面的列表就会出现你想要的内容。如图：
image.png
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xml
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adapter 这个类实现了Filterable接口，然后重写了getFilter()方法，在adapter中定义了一个内部类MyFilter继承Filter类，并重写相关方法，实现数据的过滤。
public class AppealNameListAdapter extends BaseAdapter implements Filterable
{
private List list = new ArrayList();
private Context context;
private List original;
private FilterListener listener = null;// 接口对象
public AppealNameListAdapter(List list, Context context, FilterListener listener){
this.list = list;
this.context = context;
this.listener=listener;
}
@Override
public Filter getFilter()
{
return new MyFilter();
}
@Override
public int getCount()
{
return list.size();
}
@Override
public Object getItem(int i)
{
return list.get(i);
}
@Override
public long getItemId(int i)
{
return i;
}
@Override
public View getView(int i, View view, ViewGroup viewGroup)
{
ViewHolder holder = null;
if(view==null){
view= LayoutInflater.from(context).inflate(R.layout.item_other_appeal, null);
holder = new ViewHolder();
holder.tv_name = (TextView) view.findViewById(R.id.tv_item_name);
holder.tv_number = (TextView) view.findViewById(R.id.tv_item_number);
view.setTag(holder);
}
holder = (ViewHolder) view.getTag();
holder.tv_name.setText(list.get(i).getName());
holder.tv_number.setText(list.get(i).getNumber());
return view;
}
class MyFilter extends Filter
{
/**
* 过滤数据
* @param charSequence
* @return
*/
@Override
protected FilterResults performFiltering(CharSequence charSequence)
{
FilterResults results = new FilterResults();
if(original==null){
original=new ArrayList(list);
}
if (TextUtils.isEmpty(charSequence))
{
results.values = original;
results.count = original.size();
} else
{
String prefixString = charSequence.toString().toLowerCase();
// 创建集合保存过滤后的数据
List mList = new ArrayList();
// 遍历原始数据集合，根据搜索的规则过滤数据
for (OtherAppealNameListBean s : original)
{
if(s.getNumber().startsWith(prefixString)||s.getName().startsWith(prefixString)){
mList.add(s);
}
}
results.values = mList;
results.count = mList.size();
}
return results;
}
/**
* 该方法用来刷新用户界面，根据过滤后的数据重新展示列表
* @param charSequence
* @param filterResults
*/
@Override
protected void publishResults(CharSequence charSequence, FilterResults filterResults)
{
list = (List) filterResults.values;
if(listener != null){
listener.getFilterData(list);
}
if (filterResults.count > 0) {
notifyDataSetChanged();
} else {
notifyDataSetInvalidated();
}
}
}
class ViewHolder {
TextView tv_name;
TextView tv_number;
}
}
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activity
private void initView()
{
setOperationVisibility(View.GONE);
Utils.switchKeyboard(this, mEtSearch, true);
mMSV.setViewForState(R.layout.layout_empty_view_teacher_search, MultiStateView.VIEW_STATE_EMPTY);
mMSV.setViewState(MultiStateView.VIEW_STATE_CONTENT);
mSRL.setRefreshing(false);
}
private void initData()
{
mDatas = new ArrayList<>();
mAdapter = new AppealNameListAdapter(mDatas, this, new FilterListener()
{
@Override
public void getFilterData(List list)
{
setItemClick(list);
}
});
mListView.setAdapter(mAdapter);
mPresenter.getAppealNameList();
}
private void initEvent()
{
setItemClick(mDatas);
mEtSearch.setOnEditorActionListener((v, actionId, event) ->
{
return true;
});
mEtSearch.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)
{
mAdapter.getFilter().filter(mEtSearch.getText().toString());
}
@Override
public void afterTextChanged(Editable s)
{
setOperationVisibility(s.length() == 0 ? View.GONE : View.VISIBLE);
}
});
}
private void setItemClick(List list)
{
mListView.setOnItemClickListener((parent, view, position, id) ->
{
OtherAppealNameListBean bean = list.get(position);
EventBus.getDefault().post(new OtherAppealSearchEvent(mEventTag, bean));
finish();
}
}
/**
* 取消 显示
*
* @param visible
*/
private void setOperationVisibility(int visible)
{
mIvClear.setVisibility(visible);
}
/**
* 隐藏展示 键盘
*
* @param activity
* @param editText
* @param showOrhide
*/
public static void switchKeyboard(Activity activity, EditText editText, boolean showOrhide)
{
InputMethodManager imm = (InputMethodManager) activity.getSystemService(Context.INPUT_METHOD_SERVICE);
if (showOrhide)
{
editText.setFocusable(true);
editText.setFocusableInTouchMode(true);
editText.requestFocus();
imm.showSoftInput(editText, InputMethodManager.RESULT_SHOWN);
imm.toggleSoftInput(InputMethodManager.SHOW_FORCED, InputMethodManager.HIDE_IMPLICIT_ONLY);
} else
{
imm.hideSoftInputFromWindow(editText.getWindowToken(), 0);
}
}
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接口代码 （搜索后的数据没有变，点击后还是显示原来的数据。）
/**
* Created by hm on 2019/3/15.
* 获取过滤后的数据
*/
public interface FilterListener
{
void getFilterData(List list);// 获取过滤后的数据
}
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注 （ (刚开始搜索完成后，点击搜索后的数据，但是显示的是原来的数据，那么就是数据源没有变、而这个回调，就是为了解决这个问题的，拿到过滤后的数据源，对新的数据源进行操作即可很好的解决这个问题)。）
image.png