如何在XML GridView中使宽比相等

<GridView
    android:id="@+id/gridView"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:numColumns="3"
    android:stretchMode="columnWidth"
    android:horizontalSpacing="10dp"
    android:verticalSpacing="10dp"/>

GridView gridView = findViewById(R.id.gridView);
gridView.setAdapter(adapter);

public class MyAdapter extends BaseAdapter {
    private Context context;
    private List<String> data;

    public MyAdapter(Context context, List<String> data) {
        this.context = context;
        this.data = data;
    }

    @Override
    public int getCount() {
        return data.size();
    }

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

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        if (convertView == null) {
            LayoutInflater inflater = LayoutInflater.from(context);
            convertView = inflater.inflate(R.layout.grid_item, parent, false);
        }

        // 设置每个Item的宽度为相等
        int screenWidth = context.getResources().getDisplayMetrics().widthPixels;
        int itemWidth = screenWidth / gridView.getNumColumns();
        convertView.setLayoutParams(new GridView.LayoutParams(itemWidth, ViewGroup.LayoutParams.WRAP_CONTENT));

        // 设置Item的内容
        TextView textView = convertView.findViewById(R.id.textView);
        textView.setText(data.get(position));

        return convertView;
    }
}

<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/textView"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center"
    android:padding="10dp"
    android:textSize="16sp"/>