Android 带有自定义对象的自定义 ArrayAdapter

Question

我是 Android 开发的新手。

我试图在 Android Studio 中实现自定义 ArrayAdapter 来接受自定义对象。

我参考了一些教程的源代码，但是我的屏幕输出不正确，自定义对象只填充了TextView，其中link和textViewResourceId 15=] ，而不是自定义对象的属性适当地填写布局中的所有 EditText。

我试图删除 ArrayAdapter 的构造函数中的 textViewResourceId 参数来解决问题，但 Android Studio 返回错误 - 您必须提供资源 ID对于 TextView

我想要自定义对象的属性全填EditText并且不返回任何错误信息，谁能给我提示？

这是我的布局：

row_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal" android:layout_width="match_parent"
android:layout_height="match_parent">

<TextView
    android:id="@+id/row_id"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:visibility="gone"/>

<EditText
    android:id="@+id/row_no"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:layout_margin="1dp"
    android:layout_gravity="center_horizontal"
    android:background="@color/colorWhite"/>

<EditText
    android:id="@+id/row_text"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:layout_margin="1dp"
    android:layout_gravity="center_horizontal"
    android:background="@color/colorWhite"/>


</LinearLayout>

这是我的自定义对象：

Row.java

public class Row
{
    public int RowNo;
    public String RowText;

    public Row(int no, String text)
    {
        this.RowNo = no;
        this.RowText = text;
    }
}

这是我的自定义 ArrayAdapter：

RowAdapter.java

public class RowAdapter extends ArrayAdapter<Row> {

    private final Activity _context;
    private final ArrayList<Row> rows;

    static class ViewHolder
    {
        EditText RowNo;
        EditText RowText;
    }

    public RowAdapter(Activity context, ArrayList<Row> rows)
    {
        super(context,R.layout.row_layout, R.id.row_id ,rows);
        this._context = context;
        this.rows = rows;
    }

    public View GetView(int position, View convertView, ViewGroup parent){
        ViewHolder holder = null;

        if(convertView == null)
        {
            LayoutInflater inflater = _context.getLayoutInflater();
            convertView = inflater.inflate(R.layout.row_layout,parent,false);

            holder = new ViewHolder();
            holder.RowNo = (EditText)convertView.findViewById(R.id.row_no);
            holder.RowText = (EditText)convertView.findViewById(R.id.row_text);

            convertView.setTag(holder);
        }
        else
        {
            holder = (ViewHolder) convertView.getTag();
        }

        holder.RowNo.setText(rows.get(position).RowNo);
        holder.RowText.setText(rows.get(position).RowText);

        return convertView;
    }
}

这是我的 Activity class:

RowActivity.java

   @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.row_list_page);

        listView = (ListView)findViewById(R.id.list_view);

        ArrayList<Row> rows = new ArrayList<Row>();
        rows.add(new Row(1,"Test"));
        rows.add(new Row(2,"Test"));
        rows.add(new Row(3"Test"));

        RowAdapter adapter = new RowAdapter(this,rows);
        listView.setAdapter(adapter);
}

Answer 1

public View getView (int position, View convertView, ViewGroup parent)

调用此方法获取视图对象。在您的代码中有 GetView，而不是 getView

Answer 2

更改为以下代码：-

RowAdapter.java

 public class RowAdapter extends BaseAdapter {
    
        private final Context _context;
        private final ArrayList<Row> rows;
    
        public RowAdapter(Context context, ArrayList<Row> rows)
        {
            this._context = context;
            this.rows = rows;
        }
    
          @Override
          public int getCount() {
              return rows.size();
          }
    
          @Override
          public Object getItem(int position) {
              return rows;
          }
    
          @Override
          public long getItemId(int position) {
              return position;
          }
    
        public View getView(int position, View convertView, ViewGroup parent){
    
               LayoutInflater inflater = (LayoutInflater) _context
                  .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    
               View rowView=inflater.inflate(R.layout.row_layout, null,true);
                
               EditText RowNo = (EditText) rowView.findViewById(R.id.row_no);
               EditText RowText = (EditText) rowView.findViewById(R.id.row_text);
    
               RowNo.setText(rows.get(position).RowNo);
               RowText.setText(rows.get(position).RowText);
    
            return rowView;
        }
    }

Answer 3

改变你的

public View GetView(int position, View convertView, ViewGroup parent)

与

@Override

public View getView(int position, View convertView, ViewGroup parent)

和

holder.RowNo.setText(rows.get(position).RowNo);

与

holder.RowNo.setText(""+rows.get(position).RowNo);

Answer 4

这是有效的适配器代码

public class RowAdapter extends ArrayAdapter<Row> {

    private final Activity _context;
    private final ArrayList<Row> rows;

    public class ViewHolder
    {
        EditText RowNo;
        EditText RowText;
    }

    public RowAdapter(Activity context, ArrayList<Row> rows)
    {
        super(context,R.layout.row_layout, R.id.row_id ,rows);
        this._context = context;
        this.rows = rows;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent){
        ViewHolder holder = null;

        if(convertView == null)
        {
            LayoutInflater inflater = _context.getLayoutInflater();
            convertView = inflater.inflate(R.layout.row_layout,parent,false);

            holder = new ViewHolder();
            holder.RowNo = (EditText)convertView.findViewById(R.id.row_no);
            holder.RowText = (EditText)convertView.findViewById(R.id.row_text);

            convertView.setTag(holder);
        }
        else
        {
            holder = (ViewHolder) convertView.getTag();
        }

        holder.RowNo.setText(""+rows.get(position).RowNo);
        holder.RowText.setText(rows.get(position).RowText);

        return convertView;
    }
}

您在 holder.RowNo.setText(rows.get(position).RowNo);

所以将其替换为
holder.RowNo.setText(""+rows.get(位置).RowNo);

Android 带有自定义对象的自定义 ArrayAdapter

Android custom ArrayAdapter with custom object

java

android

android-arrayadapter