[英]How to set Recyclview items on TextView in android
这是我的主屏幕,当我点击 Select All 复选框然后选中所有复选框并将所有复选框的文本设置在 textView 下方(仅文本)时,我想要。 我成功 select 所有复选框,但无法在文本框上使用单独的逗号设置文本,在适配器的帮助下,我获得了整个数据的列表,但无法在主要活动 textview 布局上设置它。 请建议我任何有用的方法来做到这一点。 谢谢。
public class MainActivity extends AppCompatActivity {
CheckBox checkboxAll;
EditText editSearch;
RecyclerView recyclerView;
TextView dataList;
MainAdapter mainAdapter;
DataAdapter dataAdapter;
List<MainModel> list;
List<String> showList = new ArrayList<>();
SharedPreferences sharedPreferences;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
sharedPreferences = this.getSharedPreferences("prefs", Context.MODE_PRIVATE);
recyclerView = findViewById(R.id.recyclerView);
checkboxAll = findViewById(R.id.checkboxAll);
dataList = findViewById(R.id.dataList);
editSearch = findViewById(R.id.editSearch);
editSearch.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
@Override
public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
String editValue = String.valueOf(charSequence);
filter(editValue);
}
@Override
public void afterTextChanged(Editable editable) {
}
});
checkboxAll.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (checkboxAll.isChecked()) {
mainAdapter.selectAll();
} else {
mainAdapter.unselectAll();
}
}
});
list = new ArrayList<>();
String[] cityname = getResources().getStringArray(R.array.cityList);
for (int i = 0; i < cityname.length; i++) {
MainModel mainModel = new MainModel(false, cityname[i]);
list.add(mainModel);
}
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
mainAdapter = new MainAdapter(MainActivity.this, list);
recyclerView.setAdapter(mainAdapter);
}
private void filter(String searchValue) {
ArrayList<MainModel> filteredList = new ArrayList<>();
for (MainModel item : list) {
if (item.getCityName().toLowerCase().contains(searchValue.toLowerCase())) {
filteredList.add(item);
}
}
mainAdapter.filterList(filteredList);
}
}
适配器是:-
public class MainAdapter extends RecyclerView.Adapter<MainAdapter.ViewHolder> {
Context context;
List<MainModel> cityList = new ArrayList<>();
int checkValue = 0;
List<String> allValues;
SharedPreferences sharedPreferences;
public MainAdapter(Context context, List<MainModel> list) {
sharedPreferences = context.getSharedPreferences("prefs", Context.MODE_PRIVATE);
this.context = context;
this.cityList = list;
}
public void selectAll() {
checkValue = 1;
notifyDataSetChanged();
}
public void unselectAll() {
checkValue = 2;
notifyDataSetChanged();
}
@NonNull
@Override
public MainAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.list_items, parent, false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull MainAdapter.ViewHolder holder, int position) {
holder.itemName.setText(cityList.get(position).getCityName());
if (checkValue == 1) {
holder.itemCheckBox.setChecked(true);
} else if (checkValue == 2) {
holder.itemCheckBox.setChecked(false);
}
}
@Override
public int getItemCount() {
return cityList.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
CheckBox itemCheckBox;
TextView itemName;
public ViewHolder(@NonNull View itemView) {
super(itemView);
itemCheckBox = itemView.findViewById(R.id.itemCheckBox);
itemName = itemView.findViewById(R.id.itemName);
}
}
public void filterList(ArrayList<MainModel> filteredList) {
cityList = filteredList;
notifyDataSetChanged();
}
}
您可以使用接口来实现它,我在代码片段下面添加
class MainActivity extends AppCompatActivity implements MainAdapter.MyRecyclerClickListener {
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
...
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
MainAdapter mainAdapter = new MainAdapter(MainActivity.this, list);
recyclerView.setAdapter(mainAdapter);
mainAdapter.setClickListener(this);
}
@Override
public void onAllItemSelected(String text) {
// set on TextView
}
@Override
public void onAllItemUnSelected(String text) {
// set on TextView toi clear all previous value
}
}
public class MainAdapter extends RecyclerView.Adapter<MainAdapter.ViewHolder> {
private MyRecyclerClickListener myRecyclerClickListener;
public void selectAll() {
checkValue = 1;
StringBuilder stringBuilder = new StringBuilder();
for (MainModel cityModel : cityList) {
stringBuilder.append(cityModel.getCityName()).append(",");
}
myRecyclerClickListener.onAllItemSelected(stringBuilder.toString());
notifyDataSetChanged();
}
public void unselectAll() {
checkValue = 2;
myRecyclerClickListener.onAllItemUnSelected("");
notifyDataSetChanged();
}
public void setClickListener(MyRecyclerClickListener myRecyclerClickListener){
this.myRecyclerClickListener = myRecyclerClickListener
}
public interface MyRecyclerClickListener{
void onAllItemSelected(String text);
void onAllItemUnSelected(String text);
}
}
在选中所有复选框时,您将更新绑定到您的文本视图的可观察字段。 您将更新后的字符串发布到该 observable,您应该在文本视图中看到它们。
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