ListView自定义Adapter的position始终为0，仅显示首项问题求助

Hey there, let's fix your ListView issue step by step. Looking at your code and logs, there are a couple of key problems causing your ListView to only show the first item:

1. Incorrect View Type Configuration in CustomAdapter #

Your CustomAdapter is treating every list item as a unique view type, which breaks ListView's recycling mechanism and prevents it from rendering items beyond position 0.

• What's wrong:

  • getItemViewType(int position) returns position, meaning each item is marked as a distinct view type.
  • getViewTypeCount() returns records.size(), which varies with your data set.
  • This confuses ListView into thinking it only needs to handle the first item's view type.

• Fix:
  Since all your items use the same list_row.xml layout, you only need one view type. Update these methods in CustomAdapter.java:

  @Override
  public int getItemViewType(int position) {
      return 0; // All items share the same view type
  }
  
  @Override
  public int getViewTypeCount() {
      return 1; // Only one type of view to handle
  }
  

2. ListView Inside ScrollView Layout Conflict #

Placing a ListView inside a ScrollView with android:layout_height="wrap_content" causes measurement issues. The ListView will only calculate the height of the first item and won't expand to show others.

• Fix (Recommended):
  Remove the outer ScrollView entirely. Use a LinearLayout with vertical orientation, and set the ListView's height to 0dp with layout_weight="1"—this lets the ListView take all remaining space and scroll properly:

  <?xml version="1.0" encoding="utf-8"?>
  <LinearLayout 
      android:layout_height="match_parent"
      android:layout_width="match_parent"
      xmlns:android="http://schemas.android.com/apk/res/android"
      android:orientation="vertical">
      <TableLayout 
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:gravity="center_horizontal"
          android:stretchColumns="*" >
          <!-- Your existing TableRows go here -->
      </TableLayout>
      <ListView 
          android:id="@+id/list"
          android:layout_width="match_parent"
          android:layout_height="0dp"
          android:layout_weight="1"
          android:divider = "#000"
          android:dividerHeight = "1dp"
          android:footerDividersEnabled = "false"
          android:headerDividersEnabled = "false">
      </ListView>
  </LinearLayout>
  

3. Broken View Recycling in getView() #

Your current getView() only sets text when creating a new view. When views are recycled (for positions 1 and 2), they'll keep the first item's data. Fix this to update content every time getView() is called:

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    ViewHolder holder;
    final Record record = (Record) records.get(position);
    
    if(convertView == null) {
        LayoutInflater layoutInflater = LayoutInflater.from(context);
        convertView = layoutInflater.inflate(R.layout.list_row, parent, false);
        holder = new ViewHolder();
        holder.date = convertView.findViewById(R.id.txtDate);
        holder.counter = convertView.findViewById(R.id.txtCounter);
        convertView.setTag(holder);
    } else {
        holder = (ViewHolder) convertView.getTag();
    }
    
    // Update text for every item, not just new views
    holder.date.setText(String.valueOf(record.getDate()));
    holder.counter.setText(String.valueOf(record.getCounter()));
    
    return convertView;
}

// Add a ViewHolder to optimize view lookup
static class ViewHolder {
    TextView date;
    TextView counter;
}

Bonus: Fix the getItem() Method #

Your adapter's getItem() returns the position instead of the actual Record object—fix that for proper data handling:

@Override
public Object getItem(int position) {
    return records.get(position);
}

After applying these changes, your ListView should display all 3 items correctly.

内容的提问来源于stack exchange，提问作者helyanti