当我使用按钮作为计数器在回收器视图中动态添加微调器（微调器下拉列表包含编辑文本）时，微调器旧下拉列表值设置为零）。值总是在计数增加时刷新。
public class MainActivity extends AppCompatActivity {
private Button btn;
private RecyclerView recyclerView;
private CustomAdapter customAdapter;
public ArrayList<EditModel> editModelArrayList;
int count=0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView = (RecyclerView) findViewById(R.id.recycler);
btn = (Button) findViewById(R.id.btn);
Button btnadd = (Button) findViewById(R.id.button);
btnadd.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
count= (int) (count+1);
arrayadd();
}
});
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(MainActivity.this,NextActivity.class);
startActivity(intent);
}
});
}
private void arrayadd() {
int position=0;
// customAdapter.notifyDataSetChanged();;
editModelArrayList = populateList();
customAdapter = new CustomAdapter(this,editModelArrayList);
recyclerView.setAdapter(customAdapter);
recyclerView.setLayoutManager(new LinearLayoutManager(getApplicationContext(), LinearLayoutManager.VERTICAL, false));
}
private ArrayList<EditModel> populateList()
{
ArrayList<EditModel> list = new ArrayList<>();
for(int i = 0; i < (count); i++){
EditModel editModel = new EditModel();
editModel.setEditTextValue("");;
editModel.setEditttt("");
editModel.setChequedate("");
editModel.setChequeamount("");
list.add(editModel);
}
return list;
}
}
自定义适配器类
public CustomAdapter(Context ctx, ArrayList<EditModel> editModelArrayList){
inflater = LayoutInflater.from(ctx);
this.editModelArrayList = editModelArrayList;
}
@Override
public CustomAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = inflater.inflate(R.layout.rv_item, parent, false);
MyViewHolder holder = new MyViewHolder(view);
return holder;
}
@Override
public void onBindViewHolder(final CustomAdapter.MyViewHolder holder, final int position) {
holder.editText.setText(editModelArrayList.get(position).getEditTextValue());
holder.editTexts.setText(editModelArrayList.get(position).getEditttt());
holder.edchequedate.setText(editModelArrayList.get(position).getChequedate());
holder.edchequeamount.setText(editModelArrayList.get(position).getChequeamount());
Log.d("print","yes");
}
@Override
public int getItemCount() {
return editModelArrayList.size();
}
class MyViewHolder extends RecyclerView.ViewHolder{
protected EditText editText;
protected EditText editTexts;
protected EditText edchequedate;
protected EditText edchequeamount;
/* protected EditText editTexts;
protected EditText editTexts;*/
public MyViewHolder(final View itemView) {
super(itemView);
final MaterialSpinner mts;
mts=itemView.findViewById(R.id.et_amounts);
mts.setItems("Cheque","DD","MO");
mts.setOnItemSelectedListener(new MaterialSpinner.OnItemSelectedListener() {
@Override
public void onItemSelected(MaterialSpinner view, int position, long id, Object item) {
L11 = (CardView) itemView.findViewById(R.id.L11);
L22 = (CardView) itemView.findViewById(R.id.L22);
L33 = (CardView) itemView.findViewById(R.id.L33);
System.out.println("itemj"+item);
if (position==0){
L11.setVisibility(View.VISIBLE);
L22.setVisibility(View.GONE);
L33.setVisibility(View.GONE);
}
else
if(position==1){
// L22.setVisibility(View.VISIBLE);
L11.setVisibility(View.GONE);
L22.setVisibility(View.VISIBLE);
L33.setVisibility(View.GONE);
}
else if (position==2){
L33.setVisibility(View.VISIBLE);
L11.setVisibility(View.GONE);
L22.setVisibility(View.GONE);
}
}
});
editText = (EditText) itemView.findViewById(R.id.editidaaaaaa);
editTexts = (EditText) itemView.findViewById(R.id.editids);
edchequedate = (EditText) itemView.findViewById(R.id.edt_chqdate);
edchequeamount = (EditText) itemView.findViewById(R.id.edt_chequeamnt);
editText.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) {
editModelArrayList.get(getAdapterPosition()).setEditTextValue(editText.getText().toString());
}
@Override
public void afterTextChanged(Editable editable) {
}
});
editTexts.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) {
editModelArrayList.get(getAdapterPosition()).setEditttt(editTexts.getText().toString());
}
@Override
public void afterTextChanged(Editable editable) {
}
});
edchequedate.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) {
editModelArrayList.get(getAdapterPosition()).setChequedate(edchequedate.getText().toString());
}
@Override
public void afterTextChanged(Editable editable) {
}
});
edchequeamount.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) {
editModelArrayList.get(getAdapterPosition()).setChequeamount(edchequeamount.getText().toString());
}
@Override
public void afterTextChanged(Editable editable) {
}
});
}
}
}
答案 0 :(得分：0)
之所以会这样，是因为recyclerview获取了一个新的适配器并列出了每个增量。移出适配器和列表的初始化。然后以每个增量在列表中添加一些内容，然后调用notifyDataSetChanged
int count=0;
private Button btn;
private RecyclerView recyclerView;
private CustomAdapter customAdapter;
public ArrayList<EditModel> editModelArrayList = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
customAdapter = new CustomAdapter(this, editModelArrayList);
recyclerView = (RecyclerView) findViewById(R.id.recycler);
recyclerView.setAdapter(customAdapter);
recyclerView.setLayoutManager(new LinearLayoutManager(getApplicationContext(), LinearLayoutManager.VERTICAL, false));
btn = (Button) findViewById(R.id.btn);
Button btnadd = (Button) findViewById(R.id.button);
btnadd.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
count= (int) (count+1);
arrayadd();
}
});
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(MainActivity.this, NextActivity.class);
startActivity(intent);
}
});
}
private void arrayadd() {
// Only add the difference of the count and the length
// the loop will only occur once since count increment is 1
for(int i = 0; i < (editModelArrayList.size() - count); i++){
EditModel editModel = new EditModel();
editModel.setEditTextValue("");;
editModel.setEditttt("");
editModel.setChequedate("");
editModel.setChequeamount("");
editModelArrayList.add(editModel);
}
customAdapter.notifyDataSetChanged();
}