Android RecyclerView添加搜索过滤器的示例代码

搜索过滤功能,相信大家都能用到,一般都是针对列表进行过滤的。下面给大家提供一种过滤列表的方法。

老规矩,先上图

RecycleView搜索过滤器-getFilter()

Android 提供了Fileterable类,可以通过过滤器(条件)来过滤数据。通常,getFilter()方法必须在提供过滤条件的适配器类中被重写,以通过列表进行搜索。下面是通过getFilter(),来过滤数据。

@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) {

//这里根据需求,添加匹配规则

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;

//刷新数据

notifyDataSetChanged();

}

};

}

完整Adapter代码:

//这里实现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;

//这里需要初始化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) {

//这里也是过滤后的list

holder.tv.setText(mFilterList.get(position));

}

@Override

public int getItemCount() {

//注意这里需要是过滤后的list

return mFilterList.size();

}

//重写getFilter()方法

@Override

public Filter getFilter() {

return new Filter() {

//执行过滤操作

@Override

protected FilterResults performFiltering(CharSequence charSequence) {

String charString = charSequence.toString();

if (charString.isEmpty()) {

//没有过滤的内容,则使用源数据

mFilterList = mSourceList;

} else {

List<String> filteredList = new ArrayList<>();

for (String str : mSourceList) {

//这里根据需求,添加匹配规则

if (str.contains(charString)) {

filteredList.add(str);

}

}

mFilterList = filteredList;

}

FilterResults filterResults = new FilterResults();

filterResults.values = mFilterList;

return filterResults;

}

//把过滤后的值返回出来

@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);

}

}

}

数据初始化部分

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]);

}

}

设置RecycleView和EditText监听

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,到这里就结束了��。

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