Android RecyclerView添加搜索過濾器的示例代碼

更新時間：2018年01月17日 08:35:00 作者：人言落日是天涯

本篇文章主要介紹了Android RecyclerView添加搜索過濾器的示例代碼，小編覺得挺不錯的，現(xiàn)在分享給大家，也給大家做個參考。一起跟隨小編過來看看吧

搜索過濾功能，相信大家都能用到，一般都是針對列表進行過濾的。下面給大家提供一種過濾列表的方法。

老規(guī)矩，先上圖

RecycleView搜索過濾器-getFilter()

Android 提供了Fileterable類，可以通過過濾器（條件）來過濾數據。通常，getFilter()方法必須在提供過濾條件的適配器類中被重寫，以通過列表進行搜索。下面是通過getFilter()，來過濾數據。

@Override
  public Filter getFilter() {
   return new Filter() {
    @Override
    protected FilterResults performFiltering(CharSequence charSequence) {
     String charString = charSequence.toString();
     if (charString.isEmpty()) {
      mFilterList = mSourceList;
     } else {
      List<String> filteredList = new ArrayList<>();
      for (String str : mSourceList) {
       //這里根據需求，添加匹配規(guī)則
       if (str.contains(charString)) {
        filteredList.add(str);
       }
      }

      mFilterList = filteredList;
     }

     FilterResults filterResults = new FilterResults();
     filterResults.values = mFilterList;
     return filterResults;
    }

    @Override
    protected void publishResults(CharSequence charSequence, FilterResults filterResults) {
     mFilterList = (ArrayList<String>) filterResults.values;
     //刷新數據
     notifyDataSetChanged();
    }
   };
  }

完整Adapter代碼：

//這里實現(xiàn)Filterable接口
class TitleAdapter extends RecyclerView.Adapter<TitleAdapter.TitleHolder> implements Filterable {

  private List<String> mSourceList = new ArrayList<>();
  private List<String> mFilterList = new ArrayList<>();

  private void appendList(List<String> list) {
   mSourceList = list;
   //這里需要初始化filterList
   mFilterList = list;
  }

  @Override
  public TitleHolder onCreateViewHolder(ViewGroup parent, int viewType) {
   return new TitleHolder(LayoutInflater.from(FastScrollRecyclerActivity.this).inflate(R.layout.item_textview_view, parent, false));
  }

  @Override
  public void onBindViewHolder(TitleHolder holder, int position) {
   //這里也是過濾后的list
   holder.tv.setText(mFilterList.get(position));
  }

  @Override
  public int getItemCount() {
   //注意這里需要是過濾后的list
   return mFilterList.size();
  }
  //重寫getFilter()方法
  @Override
  public Filter getFilter() {
   return new Filter() {
    //執(zhí)行過濾操作
    @Override
    protected FilterResults performFiltering(CharSequence charSequence) {
     String charString = charSequence.toString();
     if (charString.isEmpty()) {
      //沒有過濾的內容，則使用源數據
      mFilterList = mSourceList;
     } else {
      List<String> filteredList = new ArrayList<>();
      for (String str : mSourceList) {
       //這里根據需求，添加匹配規(guī)則
       if (str.contains(charString)) {
        filteredList.add(str);
       }
      }

      mFilterList = filteredList;
     }

     FilterResults filterResults = new FilterResults();
     filterResults.values = mFilterList;
     return filterResults;
    }
    //把過濾后的值返回出來
    @Override
    protected void publishResults(CharSequence charSequence, FilterResults filterResults) {
     mFilterList = (ArrayList<String>) filterResults.values;
     notifyDataSetChanged();
    }
   };
  }

  class TitleHolder extends RecyclerView.ViewHolder {
   TextView tv;

   public TitleHolder(View itemView) {
    super(itemView);
    tv = (TextView) itemView.findViewById(R.id.id_tv_test);
   }
  }
 }

數據初始化部分

private String[] str = new String[]{
   "apple", "apple juice", "apple pie", "abalone", "bread", "brandy", "Blueberry", "Banana", "chocolate", "cake", "chicken", "cheese", "Durian",
   "Dim Sam", "Dumpling", "duck", "egg", "English muffin", "eggplant", "French toast", "fish", "fig", "fruit"
 };

private List<String> mList = new ArrayList<>();
private void initList() {
  for (int i = 0; i < str.length; i++) {
   mList.add(str[i]);
  }
 }

設置RecycleView和EditText監(jiān)聽

RecyclerView rv = (RecyclerView) findViewById(R.id.id_rv);
  LinearLayoutManager manager = new LinearLayoutManager(this);
  rv.setLayoutManager(manager);
  final TitleAdapter adapter = new TitleAdapter();
  adapter.appendList(mList);
  rv.setAdapter(adapter);

  EditText et = findViewById(R.id.id_et);
  et.addTextChangedListener(new TextWatcher() {
   @Override
   public void beforeTextChanged(CharSequence sequence, int i, int i1, int i2) {

   }

   @Override
   public void onTextChanged(CharSequence sequence, int i, int i1, int i2) {
    adapter.getFilter().filter(sequence.toString());
   }

   @Override
   public void afterTextChanged(Editable editable) {

   }
  });

好了，到這里就結束了��。

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持腳本之家。

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