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从RecyclerView EditText获取值？

androidandroid-recyclerview
6

我在recyclerView中卡住了，

image

这里的名称和余额字段来自两个不同的数组。 我需要的是，每一行都有一个EditText字段。我需要访问每一行上的每个EditText。并从中获取值..并在Total textView上显示总数。这可能吗？我尝试了很多次。但没有成功。

我在这里附上我的类。

MainActivity

public class GroupCollectionFragment extends Fragment {
String[] nameArray = {"Akhil","Mohan","Anoop","Syam","Athul","Anish","Anand","Prasad","Mani","Oommen"
        ,"Akhil","Mohan","Anoop","Syam","Athul","Anish","Anand","Prasad","Mani","Oommen"
        ,"Akhil","Mohan","Anoop","Syam","Athul","Anish","Anand","Prasad","Mani","Oommen"};
String[] balanceArray={"2354","6578","2345","34654","2542","2354","6578","2345","34654","2542"
        ,"2354","6578","2345","34654","2542","2354","6578","2345","34654","2542"
        ,"2354","6578","2345","34654","2542","2354","6578","2345","34654","2542"};
RecyclerView mRecyclerView;
RecyclerView.Adapter mAdapter;
LinearLayoutManager mLayoutManager;
List<DataHolder> holderList=new ArrayList<DataHolder>();

@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View rootview=inflater.inflate(R.layout.group_collection_layout,container,false);
    mRecyclerView = (RecyclerView) rootview.findViewById(R.id.my_recycler_view);
    mRecyclerView.setHasFixedSize(true);
    mLayoutManager = new LinearLayoutManager(getContext());
    mRecyclerView.setLayoutManager(mLayoutManager);
    setItems();
    mAdapter = new Adapter(holderList);
    mRecyclerView.setAdapter(mAdapter);
    return rootview;
}

private void setItems() {

    for(int i=0;i<nameArray.length;i++){
        DataHolder item=new DataHolder();
        item.setDname(nameArray[i]);
        item.setDbalance(balanceArray[i]);
        holderList.add(item);
    }
}

}

数据持有者

public class DataHolder {

String dname,dbalance;
public DataHolder(){
}
public String getDname(){
    return dname;
}
public void setDname(String name){
    this.dname=name;
}
public String getDbalance(){
    return dbalance;
}
public void setDbalance(String balance){
    this.dbalance=balance;
}

}

适配器

public class Adapter extends RecyclerView.Adapter<Adapter.ViewHolder> {
private List<DataHolder> mDataSet;

public static class ViewHolder extends RecyclerView.ViewHolder{
    private TextView anameTxtView,abalanceTxtView;
    private EditText adepositEditText;
    public ViewHolder(View v){
        super(v);
        anameTxtView=(TextView)v.findViewById(R.id.nameTextView);
        abalanceTxtView=(TextView)v.findViewById(R.id.balanceTextView);
        adepositEditText=(EditText)v.findViewById(R.id.depositEditText);
    }
}

public Adapter(List<DataHolder> myData){
    mDataSet=myData;
}

@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View v=LayoutInflater.from(parent.getContext()).inflate(R.layout.row_main,parent,false);
    ViewHolder vh=new ViewHolder(v);
    return vh;
}

@Override
public void onBindViewHolder(ViewHolder holder, int position) {
    holder.anameTxtView.setText(mDataSet.get(position).getDname());
    holder.abalanceTxtView.setText(mDataSet.get(position).getDbalance());


}

@Override
public int getItemCount() {
    return mDataSet.size();
}

@Override
public int getItemViewType(int position) {
    return position;
}

}

5个回答
10

我认为你正在寻找一个回调函数，这意味着当EditText中的数字改变时，你希望总数也跟着改变。

首先，你需要添加一个接口：

OnEditTextChanged Interface

public interface OnEditTextChanged {
    void onTextChanged(int position, String charSeq);
}

那么你需要在适配器的构造函数中包含这个。

在 Adapter.java 中

private List<DataHolder> mDataSet;
private OnEditTextChanged onEditTextChanged;

public Adapter(List<DataHolder> myData, OnEditTextChanged onEditTextChanged) {
    mDataSet = myData;
    this.onEditTextChanged = onEditTextChanged;
}

在你的Adapter的onBindViewHolder中，你需要设置一个文本更改的监听器，并使用onEditTextChanged对象告诉fragment。
@Override
public void onBindViewHolder(ViewHolder holder, final int position) {
    holder.anameTxtView.setText(mDataSet.get(position).getDname());
    holder.abalanceTxtView.setText(mDataSet.get(position).getDbalance());

    holder.adepositEditText.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) {
            onEditTextChanged.onTextChanged(position, charSequence.toString());
        }

        @Override
        public void afterTextChanged(Editable editable) {}
    });
}

将此数组添加到GroupCollectionFragment中，这样您就可以在片段中保存值，并在需要时随时使用它们。
Integer[] enteredNumber = new Integer[1000];

修改 GroupCollectionFragment 中的构造函数调用

mAdapter = new Adapter(holderList, new OnEditTextChanged() {
        @Override
        public void onTextChanged(int position, String charSeq) {
            enteredNumber[position] = Integer.valueOf(charSeq);
            updateTotalValue();
        }
    }); 

private void updateTotalValue() {
    int sum = 0;
    for (int i = 0; i < 1000; i++) {
        sum += enteredNumber[i];
    }

    totalValue.setText(String.valueOf(sum));
}

如果你需要整个文件，请告诉我。我已经编写并构建了apk，它可以正常运行。

谢谢您的时间！我会仔细阅读它！ :) 我还需要那个。 - BraveHeart
@BraveHeart 如果我的答案正确，您会接受它吗？:DAdapter.java http://paste.ubuntu.com/24221230/GroupCollectionFragment.java http://paste.ubuntu.com/24221236/ - Mehdi Kazemi
当文本被删除时，我遇到了空异常问题，如果它为空，应该在哪里检查？ - Felipe Parra
我将初始化更改为以下内容。int[] enteredAmount = new int[1000]; 然后，enteredAmount[position] = Integer.parseInt(charSeq);private void updateTotalValue() { int sum = 0;//高级for循环 for (int num : enteredAmount) { sum = sum + num; } textViewRemaining.setText(String.valueOf(sum));} - Goodlife
我能否根据位置设置TextInputLayout的错误，因为当我尝试设置错误时，它出现在EditText的最后一个位置。 - Akshay
很好的解释，谢谢你同事！ - Ignacio_aa
5
一个更好的性能方法
private List<Integer> getQuantityList() {
    List<Integer> quantities = new ArrayList<>();

    for (int i = 0; i < cartItems_rv.getChildCount(); i++) {
        quantities.add(Integer.valueOf(((EditText)Objects.requireNonNull(
                Objects.requireNonNull(cartItems_rv.getLayoutManager()).findViewByPosition(i))
                .findViewById(R.id.quantity_et)).getText().toString()));
    }

    return quantities;
}

感谢Goku的回答，请随意为您自己的应用程序塑造该方法。

太棒了！谢谢。 - Andrain
3
您可以在键盘完成操作时获取值。您只需要在编辑文本中设置以下内容: android:imeOptions="actionDone" 然后使用下面的代码即可。
 adepositEditText.setOnEditorActionListener(new TextView.OnEditorActionListener() {
                @Override
                public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
                    if (actionId == EditorInfo.IME_ACTION_DONE) {
                        // Do whatever you want here

                        return true;
                    }
                    return false;

                });
只有当用户点击“完成”时，才会发生这种情况，而许多用户可能只是点击了其他字段，这意味着您会错过几个更改。 - Jeff Padgett
2
使用EditText上的TextChangedListener, 并将输入保存在新的HashMap中，以订单/行唯一键的ID作为键。
   adeposit.addTextChangedListener(new TextWatcher() {

   public void afterTextChanged(Editable s) {}

  public void beforeTextChanged(CharSequence s, int start,
                                int count, int after) {
  }

 public void onTextChanged(CharSequence s, int start,
                           int before, int count) {
  // Save value her in HashMap
  }
});

在最后从HashMap中获取值。

1
我修改了@MeHdi的答案。在RecyclerView上下滚动时，项目位置会发生变化，其值也会发生变化或变为空，这将成为一个大问题。此外，在RecyclerView的单行中有许多EditText。感谢@MeHdi的想法。屏幕看起来像下面这样enter image description here

OnEditTextChanged

public interface OnEditTextChanged {
// here component_id is editTextId (findView by Id)
void onTextChanged(int component_id, int position, String charSeq);
}

在适配器类中全局声明以下内容。
private Context context;
private List<DataModel> dailyLiqdateList;
private OnEditTextChanged onEditTextChanged;

Adapter class

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyHolder> {
private Context context;
private List<DataModel> dataList;

private OnEditTextChanged onEditTextChanged;

public MyAdapter(Context mContext, List<DataModel> dataList, OnEditTextChanged onEditTextChanged) {
    this.context = mContext;
    this.dataList = dataList;
    this.onEditTextChanged = onEditTextChanged;
}

@NonNull
@Override
public MyHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

    View myHolder = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_list,parent,false);
    return new MyHolder(myHolder);
}
@Override
public int getItemCount() {
    return dataList.size();
}

 // This is important method due to which even if you scroll list, editText values will not get changed/empty. This method will maintain its position in recyclerview
@Override
public int getItemViewType(int position) {
    return position;
}

@Override
public void onBindViewHolder(MyHolder holder, int position) {

    holder.bind(dataList.get(position), position);

    holder.firstEditText.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) {

        }

        @Override
        public void afterTextChanged(Editable editable) {
            onEditTextChanged.onTextChanged(R.id.item_firstEditText,position, holder.firstEditText.getText().toString());
        }
    });

    holder.secondEditText.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) {

        }

        @Override
        public void afterTextChanged(Editable editable) {
            onEditTextChanged.onTextChanged(R.id.item_secondEditText, position, holder.secondEditText.getText().toString());
        }
    });


}

public class MyHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
    TextView headerName;
    EditText firstEditText, secondEditText;

    MyHolder(View itemView) {
        super(itemView);
        headerName = itemView.findViewById(R.id.headerNameTv);
        firstEditText = itemView.findViewById(R.id.item_firstEditText);
        secondEditText = itemView.findViewById(R.id.item_secondEditText);;

    }

    public void bind(final DataModel dto, int position) {
        if (dto != null) {
                headerName.setText(dto.getName());
        }
    }
}
}

您的Activity类中包含RecyclerView

// declare these values globally
Integer[] firstValues, secondValues;
// Declare textviews for calculating and setting total values
private TextView firstTotalTv, secondTotalTv;

// Initialize editText values array list, same as dataList size.
firstValues= new Integer[dataList.size()];
secondValues= new Integer[dataList.size()];

// setting adapter on recyclerview, write this in onCreate()
myAdapter = new MyAdapter(thisActivity, dataList, new OnEditTextChanged() {
        @Override
        public void onTextChanged(int component_id, int position, String charSeq) {
            if (component_id == R.id.item_firstEditText) {
                if (Utils.isValidStr(charSeq)) {
                    firstValues[position] = Integer.valueOf(charSeq);

                } else {
                    firstValues[position] = null;
                }
                updateTotalValue1(firstValues, firstTotalTv);
            }

            if (component_id == R.id.item_secondEditText) {
                if (Utils.isValidStr(charSeq)) {
                    secondValues[position] = Integer.valueOf(charSeq);
                } else {
                    secondValues[position] = null;
                }
                updateTotalValue1(secondValues, secondTotalTv);
            }                
        }
    });
    recyclerView.setAdapter(myAdapter);


   // Update Method, write outside of onCreate()
   private void updateTotalValue1(Integer[] editTextList, TextView totalTextView) {
    int pSum = 0, c1Sum = 0;
    for (int i = 0; i < editTextList.length; i++) {
        if (editTextList[i] != null)
            pSum += editTextList[i];
        else if (i == 0 && editTextList[i] == null)
            pSum = 0;
    }
    if (pSum > 0)
        totalTextView.setText(String.valueOf(pSum));
    else
        totalTextView.setText("");
}
请问您能分享一下 Utils 类吗？ - jvargas
public static boolean isValidStr(String string) { return string != null && !string.trim().isEmpty(); } ，请将此方法写在您的Utils类中。 - Tara
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