android - 选择同一组的多个相关行 onlongclick ListView

Question

我计划有一个 ListView ，当单击时，将能够选择所有子行/相关行。

例子

输入: 长按用户名/年龄/生日 输出: 返回用户名、年龄和生日。

问题

长按只会返回用户名，不会返回年龄和生日。

我没有在 toast 中显示年龄和生日值，因为应用会显示错误并停止运行。

最新: 已在 17 年 11 月 26 日展示了 Adapter 和对象类

ListView 的自定义布局

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


        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Username:"
            android:background="#FF2400"
            android:textColor="#FFFFFF" />

            <EditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/text_user_name"
            android:textColor="#FFFFFF"
            android:background="#FF2400"
            android:text="Username"
            android:gravity="left"/>

        </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Age:"
            android:background="#FFFFFF"
            android:textColor="#000000" />

        <EditText
            android:layout_width="match_parent"
            android:layout_weight="0.5"
            android:textColor="#000000"
            android:layout_height="wrap_content"
            android:id="@+id/text_user_age"
            android:background="#FFFFFF"
            android:text="Age"
            android:gravity="left"/>

    </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Birthday:"
                android:background="#FFFFFF"
                android:textColor="#000000" />

            <EditText
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="0.5"
                android:textColor="#000000"
                android:background="#FFFFFF"
                android:id="@+id/text_user_birthday"
                android:text="Birthday"
                android:gravity="left"/>
        </LinearLayout>
        </LinearLayout>

DataListActivity( ListView Activity )

    listview.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener(){
                public boolean onItemLongClick(AdapterView<?> arg0, View v,
                                               int index, long arg3)
                {

AlertDialog.Builder builder = new AlertDialog.Builder(DataListActivity.this);
                builder.setTitle("Notice");
                builder.setMessage("Launching this missile will destroy the entire universe. Is this what you intended to do?");
                final View clicklist = v;
                final int position = index;

builder.setPositiveButton("Launch missile", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        String selname= ((EditText) clicklist.findViewById(R.id.text_user_name)).getText().toString();
                     //   String selage= ((EditText) clicklist.findViewById(R.id.text_user_age)).getText().toString();
                        String selbirthday= ((EditText) clicklist.findViewById(R.id.text_user_birthday)).getText().toString();
                        Toast.makeText(DataListActivity.this,selname + selage + selbirthday,Toast.LENGTH_LONG).show();
    }
                });
                builder.setNegativeButton("Cancel", null);

AlertDialog dialog = builder.create();
                dialog.show();
                return false;
            }
        });

布局适配器

public class ListDataAdapter extends ArrayAdapter{
List list = new ArrayList();

static class LayoutHandler
{
    TextView NAME,AGE,BIRTHDAY;
}
public ListDataAdapter(Context context, int resource) {
    super(context, resource);
}

@Override
public void add (Object object)
{
    super.add(object);
    list.add(object);
}

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

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

@Override
public View getView (int position, View convertView, ViewGroup parent){

    View row = convertView;
    LayoutHandler layoutHandler;
    if (row==null)
    {
        LayoutInflater layoutInflater = (LayoutInflater) this.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        row = layoutInflater.inflate(R.layout.row_layout,parent,false);
        layoutHandler = new LayoutHandler();
        layoutHandler.NAME = (TextView) row.findViewById(R.id.text_user_name);
        layoutHandler.AGE = (TextView) row.findViewById(R.id.text_user_age);
        layoutHandler.BIRTHDAY = (TextView) row.findViewById(R.id.text_user_birthday);
    }
    else
    {
        layoutHandler = (LayoutHandler) row.getTag();
    }
    DataProvider dataProvider = (DataProvider) this.getItem(position);
    layoutHandler.NAME.setText(dataProvider.getName());
    layoutHandler.AGE.setText(dataProvider.getAge());
    layoutHandler.BIRTHDAY.setBIRTHDAY(dataProvider.getBirthday());


    return row;
}

@Override
public void clear()
{
    list.clear();
}

public class DataProvider {

private String Name;
private String Age;
private String Birthday;

....getter 和 setter 方法

Answer 1

分析你的代码后，我发现了以下问题:-

在 List 适配器中，您没有将标签设置为 row 所以它总是返回 null layoutHandler 并且您将 EditText 转换为 TextView ，我在这里没有明白您的意思如果你想要 TextView 然后在 XML 中使用相同的 View 。

所以 ListAdapter 看起来像这样。

public class ListAdapter extends ArrayAdapter {
    List list = new ArrayList();

    static class LayoutHandler
    {
        EditText NAME,AGE,BIRTHDAY;
    }
    public ListAdapter(Context context, int resource) {
        super(context, resource);
    }

    @Override
    public void add (Object object)
    {
        super.add(object);
        list.add(object);
    }

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

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

    @Override
    public View getView (int position, View convertView, ViewGroup parent){

        View row = convertView;
        LayoutHandler layoutHandler;
        if (row==null)
        {
            LayoutInflater layoutInflater = (LayoutInflater) this.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            row = layoutInflater.inflate(R.layout.custom_layout,parent,false);
            layoutHandler = new LayoutHandler();
            layoutHandler.NAME = (EditText) row.findViewById(R.id.text_user_name);
            layoutHandler.AGE = (EditText) row.findViewById(R.id.text_user_age);
            layoutHandler.BIRTHDAY = (EditText) row.findViewById(R.id.text_user_birthday);
            row.setTag(layoutHandler);
        }
        else
        {
            layoutHandler = (LayoutHandler) row.getTag();
        }
        DataProvider dataProvider = (DataProvider) this.getItem(position);
        layoutHandler.NAME.setText(dataProvider.getName());
        layoutHandler.AGE.setText(dataProvider.getAge());
        layoutHandler.BIRTHDAY  .setText(dataProvider.getBirthday());


        return row;
    }

    @Override
    public void clear()
    {
        list.clear();
    }


}

然后进入实际问题，即 ListView OnItemLongClickListener 崩溃。你只需要改变

final View clicklist = v;

到

final View clicklist = arg0.getChildAt(index);

然后你就走了。 :)