@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();    }   };  }

//這里實現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);   }  } }

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]);  } }

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) {   }  });