Android RecyclerView - 多个Edittext同时更改

Question

我有一个 RecyclerView，其中有许多卡片，其中包含 4 个 EditText。当我在一张卡的一个 EditText 中输入值时，它会在随机卡中填充相同的值。令人惊讶的是它不会跳转 EditText 例如:

如果我在 card1 的 edittext1 中输入值，它会将相同的值填充到 card8 中的 edittext1 中，并且如果我更改 card8 中的值，它将更改回 card1 中的值。有人可以告诉我为什么会发生这种情况吗？

提前谢谢您

这是我的代码:

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {    
private String[] mDataset;
public String[][] data = new String[30][4];


public static class ViewHolder extends RecyclerView.ViewHolder {
     // each data item is just a string in this case
     public LinearLayout mCardView;

     public ViewHolder(LinearLayout v) {
        super(v);
        mCardView = v;
    }
}

// Provide a suitable constructor (depends on the kind of dataset)
public MyAdapter(String[] myDataset) {
    mDataset = myDataset;
}

// Create new views (invoked by the layout manager)
@Override
public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent,
                                               int viewType) {

    LinearLayout v = (LinearLayout) LayoutInflater.from(parent.getContext())
            .inflate(R.layout.cards, parent, false);

    ViewHolder vh = new ViewHolder(v);
    return vh;
}


// Replace the contents of a view (invoked by the layout manager)
@Override
public void onBindViewHolder(ViewHolder holder, final int position) {
    // - get element from your dataset at this position
    // - replace the contents of the view with that element
    final EditText txt = (EditText) holder.mCardView.findViewById(R.id.ip1_text);
    final EditText txt2 = (EditText) holder.mCardView.findViewById(R.id.ip2_text);

    final EditText txt3 = (EditText) holder.mCardView.findViewById(R.id.ip3_text);
    final EditText txt4 = (EditText) holder.mCardView.findViewById(R.id.ip4_text);
    txt.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {

        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {

        }

        @Override
        public void afterTextChanged(Editable s) {
            data[position][0] = s.toString();
            Log.d("DATA" + position + "0", s.toString());
        }
    });
    txt2.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {

        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {

        }

        @Override
        public void afterTextChanged(Editable s) {
            data[position][1] = s.toString();
            Log.d("DATA" + position + "1", s.toString());
        }
    });
    txt3.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {

        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {

        }

        @Override
        public void afterTextChanged(Editable s) {
            data[position][2] = s.toString();
            Log.d("DATA" + position + "2", s.toString());
        }
    });
    txt4.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {

        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {

        }

        @Override
        public void afterTextChanged(Editable s) {
            data[position][3] = s.toString();
            Log.d("DATA" + position + "3", s.toString());
        }
    });

    TextView t = (TextView) holder.mCardView.findViewById(R.id.serNo);
    t.setText(mDataset[position]);


}

// Return the size of your dataset (invoked by the layout manager)
@Override
public int getItemCount() {
    return mDataset.length;
}

public String[][] getData() {
    return data;
}  

这是我的卡片 xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:weightSum="1">
<!-- A CardView that contains a TextView -->
<android.support.v7.widget.CardView
    android:id="@+id/card_view"
    android:layout_width="375dp"
    android:layout_height="wrap_content"
    android:layout_margin="4dp"
    android:backgroundTint="#eeeeee"
    card_view:cardCornerRadius="4dp">

    <TextView
        android:id="@+id/serNo"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical"
        android:text="number"
        android:layout_margin="20dp"
        android:textColor="@color/cardview_dark_background" />

    <RelativeLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center">

        <EditText
            android:id="@+id/ip1_text"
            android:layout_width="100dp"
            android:layout_height="30dp"
            android:layout_alignParentLeft="true"
            android:layout_marginTop="20dp"
            android:background="@color/cardview_light_background"
            android:inputType="number"
            android:maxLength="2" />

        <EditText
            android:id="@+id/ip3_text"
            android:layout_width="80dp"
            android:layout_height="30dp"
            android:layout_below="@+id/ip1_text"
            android:layout_marginBottom="10dp"
            android:layout_marginLeft="10dp"
            android:layout_marginTop="10dp"
            android:background="@color/cardview_light_background"
            android:inputType="number"
            android:maxLength="1" />

        <EditText
            android:id="@+id/ip2_text"
            android:layout_width="100dp"
            android:layout_height="30dp"
            android:layout_marginLeft="20dp"
            android:layout_marginTop="20dp"
            android:layout_toRightOf="@+id/ip1_text"
            android:background="@color/cardview_light_background"
            android:inputType="number"
            android:maxLength="2" />

        <EditText
            android:id="@+id/ip4_text"
            android:layout_width="80dp"
            android:layout_height="30dp"
            android:layout_below="@+id/ip2_text"
            android:layout_marginBottom="10dp"
            android:layout_marginLeft="40dp"
            android:layout_marginTop="10dp"
            android:layout_toRightOf="@+id/ip3_text"
            android:background="@color/cardview_light_background"
            android:inputType="number"
            android:maxLength="1" />
    </RelativeLayout>
</android.support.v7.widget.CardView>
</LinearLayout>

Answer 1

发生这种情况是因为 RecyclerView 内的 View 正在被回收。在 onBindViewHolder 中，您需要将特定文本设置为特定位置的 EditText。

1. 在 ViewHolder 中初始化 View 并在其中添加 TextWatchers，因为 RecyclerView 的整个理念是重用 View :

   public static class ViewHolder extends RecyclerView.ViewHolder {
   
       EditText txt;
       EditText txt2;
       EditText txt3;
       EditText txt4;
   
       TextView serNoTxt;
   
       public ViewHolder(LinearLayout mCardView) {
           super(mCardView);
           txt = (EditText) mCardView.findViewById(R.id.ip1_text);
           txt2 = (EditText) mCardView.findViewById(R.id.ip2_text);
           txt3 = (EditText) mCardView.findViewById(R.id.ip3_text);
           txt4 = (EditText) mCardView.findViewById(R.id.ip4_text);
   
           setNoTxt = (TextView) mCardView.findViewById(R.id.serNo);
   
           txt.addTextChangedListener(new TextWatcher() {
               @Override
               public void beforeTextChanged(CharSequence s, int start, int count, int after) {
   
               }
   
               @Override
               public void onTextChanged(CharSequence s, int start, int before, int count) {
   
               }
   
               @Override
               public void afterTextChanged(Editable s) {
                   data[getAdapterPosition()][0] = s.toString();
                   Log.d("DATA" + getAdapterPosition() + "0", s.toString());
               }
               });
           txt2.addTextChangedListener(new TextWatcher() {
               @Override
               public void beforeTextChanged(CharSequence s, int start, int count, int after) {
   
               }
   
               @Override
               public void onTextChanged(CharSequence s, int start, int before, int count) {
   
               }
   
               @Override
               public void afterTextChanged(Editable s) {
                   data[getAdapterPosition()][1] = s.toString();
                   Log.d("DATA" + getAdapterPosition() + "1", s.toString());
               }
           });
           txt3.addTextChangedListener(new TextWatcher() {
               @Override
               public void beforeTextChanged(CharSequence s, int start, int count, int after) {
   
               }
   
               @Override
               public void onTextChanged(CharSequence s, int start, int before, int count) {
   
               }
   
               @Override
               public void afterTextChanged(Editable s) {
                   data[getAdapterPosition()][2] = s.toString();
                   Log.d("DATA" + getAdapterPosition() + "2", s.toString());
               }
           });
           txt4.addTextChangedListener(new TextWatcher() {
               @Override
               public void beforeTextChanged(CharSequence s, int start, int count, int after) {
   
               }
   
               @Override
               public void onTextChanged(CharSequence s, int start, int before, int count) {
   
               }
   
               @Override
               public void afterTextChanged(Editable s) {
                   data[getAdapterPosition()][3] = s.toString();
                   Log.d("DATA" + getAdapterPosition() + "3", s.toString());
               }
           });
       }
   }
   

2. 在 onBindViewHolder 中为 EditTexts 设置适当的文本:

   @Override
   public void onBindViewHolder(ViewHolder holder, final int position) {
       holder.txt1.setText(data[position][0]);
       holder.txt2.setText(data[position][1]);
       holder.txt3.setText(data[position][2]);
       holder.txt4.setText(data[position][3]);
   
       holder.setNoTxt.setText(mDataset[position]);
   }