MainActivity： -

public class MainActivity extends AppCompatActivity {

    private ArrayList<Friend> friendArrayList;

    String[] countriessArray =  { "USA", "USA", "USA", "USA",
            "China", "Japan", "France", "USA","USA", "USA", "USA", "USA",
            "China", "Japan", "France", "USA"};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_layout);

        friendArrayList = new ArrayList<Friend>();
        for (int i = 0; i < countriessArray.length; i++) {

            Friend item = new Friend(countriessArray[i]);
            friendArrayList.add(item);
        }

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

        ListViewAdapter adapter = new ListViewAdapter(this, R.layout.item_listview, friendArrayList);

        listView.setAdapter(adapter);
    }
}

ListViewAdapter： -

public class ListViewAdapter extends ArrayAdapter<Friend> implements AdapterView.OnItemSelectedListener {

    private List<Friend> myFriends;
    private Activity activity;
    private int selectedPosition = -1;

    public ListViewAdapter(Activity context, int resource, List<Friend> objects){

        super(context, resource, objects);
        this.activity = context;
        this.myFriends = objects;
    }

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

        ViewHolder holder;
        LayoutInflater inflater = (LayoutInflater) activity.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);

        // If holder not exist then locate all view from UI file.
        if (convertView == null) {
            // inflate UI from XML file
            convertView = inflater.inflate(R.layout.item_listview, parent, false);
            // get all UI view
            holder = new ViewHolder(convertView);
            // set tag for holder
            convertView.setTag(holder);
        } else {
            // if holder created, get tag from view
            holder = (ViewHolder) convertView.getTag();
        }

        holder.checkBox.setTag(position); // This line is important.
        holder.friendName.setText(getItem(position).getName());

        if (position == selectedPosition) {
            holder.checkBox.setChecked(true);
        } else holder.checkBox.setChecked(false);
        holder.checkBox.setOnClickListener(onStateChangedListener(holder.checkBox, position));

        // Spinner Drop down elements

        List<String> categories = new ArrayList<String>();
        categories.add("Automobile");
        categories.add("Business Services");
        categories.add("Computers");
        categories.add("Education");
        categories.add("Personal");
        categories.add("Travel");

        // Creating adapter for spinner
        ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(activity, android.R.layout.simple_spinner_item, categories);

        // Drop down layout style - list view with radio button
        dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

        // attaching data adapter to spinner
        holder.spinner.setAdapter(dataAdapter);

        holder.spinner.setOnItemSelectedListener(this);

        return convertView;
    }

    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
        // On selecting a spinner item
    }
    public void onNothingSelected(AdapterView<?> arg0) {
        // TODO Auto-generated method stub
    }

    private View.OnClickListener onStateChangedListener(final CheckBox checkBox, final int position) {
        return new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                if (checkBox.isChecked()) {
                    selectedPosition = position;
                } else {
                    selectedPosition = -1;
                }
                notifyDataSetChanged();
            }
        };
    }

    private static class ViewHolder {

        private TextView friendName;
        private CheckBox checkBox;
        private Spinner spinner;

        public ViewHolder(View v) {

            checkBox = (CheckBox) v.findViewById(R.id.check);
            friendName = (TextView) v.findViewById(R.id.name);
            spinner = (Spinner) v.findViewById(R.id.spinnerList);
        }
    }
}

朋友： -

public class Friend {

    private String name;

    public Friend(String name) {
        this.name = name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }
}

Answer 1

更好的方法是...... 在您的Pojo类朋友中添加选择作为属性。

像： int selection = 0; 添加getter setter。

在OnItemselected中，将其值设置为微调器的选定位置。在你的getview中，你需要添加条件并从其getter方法中获取值。

将课程更改为以下内容：

rescan_Target

在适配器视图中，

更改此holder.spinner.setOnItemSelectedListener（this）; 对此：

public class Friend {

    private String name;
    private int selection = 0;

    public Friend(String name) {
        this.name = name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

   public void setSelection(int selection) {
        this.selection = selection;
    }

    public int getSelection() {
        return selection;
    }
}

在你的getView听众之后，添加

holder.spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                getItem(position).setselection(position);
            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {

            }
        });;

Answer 2

这是正常的，因为每次滚动时都会调用getView来获取单元格的视图，并在那里重置微调器项目。

holder.spinner.setAdapter（DataAdapter的）; 这行（以及初始化dataAdapter并设置单击侦听器的行）应该放在if（convertView == null）块中（这是初始化单元格视图的位置）。

在onSpinnerClick方法中，您应该跟踪每个单元格的选定项目，在返回convertView之前，您应该设置holder.spinner.setSelectedItem（），以便每个单元格的微调器都显示以前选择的项目

滚动ListView时，Spinner setSelection数据将消失

MainActivity： -

ListViewAdapter： -

朋友： -

2 个答案: