Android:如何将微调器绑定到自定义对象列表?

android adapter spinner

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13回复

32582 作者的声誉

在用户界面中,必须有一个微调器,其中包含一些名称(名称可见),每个名称都有自己的ID(ID不等于显示顺序)。当用户从列表中选择名称时,必须更改变量currentID。

该应用程序包含ArrayList

User是具有ID和名称的对象:

public class User{
        public int ID;
        public String name;
    }

我不知道的是如何创建一个显示用户名列表并将微调器项绑定到ID的微调器,这样当选择/更改微调器项时,变量currentID被设置为适当的值。

如果有人能够展示所述问题的解决方案或提供解决问题的任何链接,我将不胜感激。

谢谢!

作者: Niko Gamulin 的来源 发布者: 2009 年 10 月 26 日

回应 13


40

21682 作者的声誉

决定

你可以看看这个答案。您也可以使用自定义适配器,但下面的解决方案适用于简单的情况。

这是重新发布的帖子:

所以如果你来到这里是因为你想在Spinner中同时拥有标签和值 - 这就是我如何做到的:

  1. 只需创建您Spinner通常的方式
  2. array.xml文件中定义2个相等大小的数组- 一个用于标签,一个用于值
  3. 设置你Spinnerandroid:entries="@array/labels"
  4. 当你需要一个值时,做这样的事情(不,你不必链接它):

      String selectedVal = getResources().getStringArray(R.array.values)[spinner.getSelectedItemPosition()];
    
作者: Bostone 发布者: 2009 年 10 月 26 日

6

129 作者的声誉

对我来说工作正常,getResource()所需的代码如下:

spinner = (Spinner) findViewById(R.id.spinner);
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

        @Override
        public void onItemSelected(AdapterView<?> spinner, View v,
                int arg2, long arg3) {
            String selectedVal = getResources().getStringArray(R.array.compass_rate_values)[spinner.getSelectedItemPosition()];
            //Do something with the value
        }

        @Override
        public void onNothingSelected(AdapterView<?> arg0) {
            // TODO Auto-generated method stub
        }

    });

只需要确保(自己)两个数组中的值正确对齐!

作者: Sonja 发布者: 2010 年 4 月 30 日

297

2991 作者的声誉

我知道线程很旧,但以防万一......

用户对象:

public class User{

    private int _id;
    private String _name;

    public User(){
        this._id = 0;
        this._name = "";
    }

    public void setId(int id){
        this._id = id;
    }

    public int getId(){
        return this._id;
    }

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

    public String getName(){
        return this._name;
    }
}

自定义微调器适配器(ArrayAdapter)

public class SpinAdapter extends ArrayAdapter<User>{

    // Your sent context
    private Context context;
    // Your custom values for the spinner (User)
    private User[] values;

    public SpinAdapter(Context context, int textViewResourceId,
            User[] values) {
        super(context, textViewResourceId, values);
        this.context = context;
        this.values = values;
    }

    @Override
    public int getCount(){
       return values.length;
    }

    @Override
    public User getItem(int position){
       return values[position];
    }

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


    // And the "magic" goes here
    // This is for the "passive" state of the spinner
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // I created a dynamic TextView here, but you can reference your own  custom layout for each spinner item
        TextView label = (TextView) super.getView(position, convertView, parent);
        label.setTextColor(Color.BLACK);
        // Then you can get the current item using the values array (Users array) and the current position
        // You can NOW reference each method you has created in your bean object (User class)
        label.setText(values[position].getName());

        // And finally return your dynamic (or custom) view for each spinner item
        return label;
    }

    // And here is when the "chooser" is popped up
    // Normally is the same view, but you can customize it if you want
    @Override
    public View getDropDownView(int position, View convertView,
            ViewGroup parent) {
        TextView label = (TextView) super.getDropDownView(position, convertView, parent);
        label.setTextColor(Color.BLACK);
        label.setText(values[position].getName());

        return label;
    }
}

并实施:

public class Main extends Activity {
    // You spinner view
    private Spinner mySpinner;
    // Custom Spinner adapter (ArrayAdapter<User>)
    // You can define as a private to use it in the all class
    // This is the object that is going to do the "magic"
    private SpinAdapter adapter;

        @Override
        public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        // Create the Users array
        // You can get this retrieving from an external source
        User[] users = new User[2];

        users[0] = new User();
        users[0].setId(1);
        users[0].setName("Joaquin");

        users[1] = new User();
        users[1].setId(2);
        users[1].setName("Alberto");

        // Initialize the adapter sending the current context
        // Send the simple_spinner_item layout
        // And finally send the Users array (Your data)
        adapter = new SpinAdapter(Main.this,
            android.R.layout.simple_spinner_item,
            users);
        mySpinner = (Spinner) findViewById(R.id.miSpinner);
        mySpinner.setAdapter(adapter); // Set the custom adapter to the spinner
        // You can create an anonymous listener to handle the event when is selected an spinner item
        mySpinner.setOnItemSelectedListener(new OnItemSelectedListener() {

            @Override
            public void onItemSelected(AdapterView<?> adapterView, View view,
                    int position, long id) {
                // Here you get the current item (a User object) that is selected by its position
                User user = adapter.getItem(position);
                // Here you can do the action you want to...
                Toast.makeText(Main.this, "ID: " + user.getId() + "\nName: " + user.getName(),
                    Toast.LENGTH_SHORT).show();
            }
            @Override
            public void onNothingSelected(AdapterView<?> adapter) {  }
        });
    }
}
作者: Joaquin Alberto 发布者: 2011 年 11 月 14 日

3

399 作者的声誉

为了理解这个技巧,我们必须知道,Adapters如何工作,特别是ArrayAdapter。

适配器:是能够将数据结构绑定到窗口小部件的对象,然后这些窗口小部件在List或Spinner中显示该数据。

所以适配器回答的两个问题是:

  1. 哪个窗口小部件或复合视图需要与某个索引的数据结构(您的类'对象)相关联?
  2. 如何从数据结构(您的类'对象)中提取数据以及如何EditText根据此数据设置小部件或复合视图的字段?

ArrayAdapter的答案是:

  • 任何索引的每个小部件(即row.xmlOR android.R.layout.simple_spinner_item)都是相同的,并且从ID给予ArrayAdapter的构造函数的资源中膨胀。
  • 每个小部件都应该是TextView(或后代)的实例。窗口小部件的.setText()方法将与支持数据结构中项目的字符串格式一起使用。字符串格式将通过调用.toString()项目获得。

CustomListViewDemo.java

public class CustomListViewDemo extends ListActivity {
  private EfficientAdapter adap;

  private static String[] data = new String[] { "0", "1", "2", "3", "4" };

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    setContentView(R.layout.main);
    adap = new EfficientAdapter(this);
    setListAdapter(adap);
  }

  @Override
  protected void onListItemClick(ListView l, View v, int position, long id) {
    // TODO Auto-generated method stub
    super.onListItemClick(l, v, position, id);
    Toast.makeText(this, "Click-" + String.valueOf(position), Toast.LENGTH_SHORT).show();
  }

  public static class EfficientAdapter extends BaseAdapter implements Filterable {
    private LayoutInflater mInflater;
    private Bitmap mIcon1;
    private Context context;
    int firstpos=0;

    public EfficientAdapter(Context context) {
      // Cache the LayoutInflate to avoid asking for a new one each time.
      mInflater = LayoutInflater.from(context);
      this.context = context;
    }

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

      ViewHolder holder;

      if (convertView == null) {
        convertView = mInflater.inflate(R.layout.adaptor_content, null);

        holder = new ViewHolder();
        holder.sp = (Spinner) convertView.findViewById(R.id.spinner1);

        holder.ArrayAdapter_sp = new ArrayAdapter(parent.getContext(),android.R.layout.simple_spinner_item,data);
        holder.ArrayAdapter_sp.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

        holder.sp.setAdapter( holder.ArrayAdapter_sp);
        holder.sp.setOnItemSelectedListener(new OnItemSelectedListener()
        {
            private int pos = position;
            @Override
            public void onItemSelected(AdapterView<?> arg0, View arg1,
                    int p, long arg3) 
            {
                // TODO Auto-generated method stub
                 Toast.makeText(context, "select spinner " + String.valueOf(pos)+" with value ID "+p, Toast.LENGTH_SHORT).show();    

            }

            @Override
            public void onNothingSelected(AdapterView<?> arg0)
            {
                // TODO Auto-generated method stub

            }
        });




        convertView.setTag(holder);
      } else {

        holder = (ViewHolder) convertView.getTag();
      }


      return convertView;
    }

    static class ViewHolder 
    {

        Spinner sp;
        ArrayAdapter ArrayAdapter_sp;

    }

    @Override
    public Filter getFilter() {
      // TODO Auto-generated method stub
      return null;
    }

    @Override
    public long getItemId(int position) {
      // TODO Auto-generated method stub
      return 0;
    }

    @Override
    public int getCount() {
      // TODO Auto-generated method stub
      return data.length;
    }

    @Override
    public Object getItem(int position) {
      // TODO Auto-generated method stub
      return data[position];
    }

  }

}

adaptor_content.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/lineItem"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:gravity="center_vertical" >

    <Spinner
        android:id="@+id/spinner1"
        android:layout_width="314dp"
        android:layout_height="wrap_content" />

</LinearLayout>

main.xml中

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_height="fill_parent" android:layout_width="fill_parent"
    >

    <ListView
        android:id="@+id/android:list"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_marginBottom="60dip"
        android:layout_marginTop="10dip"
        android:cacheColorHint="#00000000"
        android:drawSelectorOnTop="false" />

</RelativeLayout>

它运作正常,我希望它是有用的。

作者: Parag Ghetiya 发布者: 2012 年 10 月 11 日

5

61 作者的声誉

受Joaquin Alberto的启发,这对我有用:

public class SpinAdapter extends ArrayAdapter<User>{


    public SpinAdapter(Context context, int textViewResourceId,
            User[] values) {
        super(context, textViewResourceId, values);
    }



    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        TextView label = (TextView) super.getView(position, convertView, parent);
        label.setTextColor(Color.BLACK);
        label.setText(this.getItem(position).getName());
        return label;
    }

    @Override
    public View getDropDownView(int position, View convertView,ViewGroup parent) {
        TextView label = (TextView) super.getView(position, convertView, parent);
        label.setTextColor(Color.BLACK);
        label.setText(this.getItem(position).getName());
        return label;
    }
}
作者: Annamaria 发布者: 2013 年 2 月 26 日

5

51 作者的声誉

基于Joaquin Alberto(感谢)示例,但它适用于任何类型(您应该在类型中实现toString(),因此您可以格式化输出。

import java.util.List;

import android.content.Context;
import android.graphics.Color;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

public class SpinAdapter<T> extends ArrayAdapter<T> {
private Context context;
private List<T> values;

public SpinAdapter(Context context, int textViewResourceId, List<T> values) {
    super(context, textViewResourceId, values);
    this.context = context;
    this.values = values;
}

public int getCount() {
    return values.size();
}

public T getItem(int position) {
    return values.get(position);
}

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

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    TextView label = new TextView(context);
    label.setTextColor(Color.BLACK);
    label.setText(values.toArray(new Object[values.size()])[position]
            .toString());
    return label;
}

@Override
public View getDropDownView(int position, View convertView, ViewGroup parent) {
    TextView label = new TextView(context);
    label.setTextColor(Color.BLACK);
    label.setText(values.toArray(new Object[values.size()])[position]
            .toString());

    return label;
}
}

此外,我认为你可以替换List by Array,所以你不需要在列表中做toArray,但我有一个List ..... :)

作者: Alberto Ricart 发布者: 2013 年 4 月 10 日

73

24300 作者的声誉

最简单的解决方案

在SO上搜索不同的解决方案之后,我发现以下是用于填充Spinner自定义的最简单和最干净的解决方案Objects。这是完整的实现:

User.java

public class User{
    public int ID;
    public String name;

    @Override
    public String toString() {
        return this.name;            // What to display in the Spinner list.
    }
}    

RES /布局/ spinner.xml

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:padding="10dp"
    android:textSize="14sp"
    android:textColor="#FFFFFF"
    android:spinnerMode="dialog" />

RES /布局/ your_activity_view.xml

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

    <Spinner
        android:id="@+id/user" />

</LinearLayout>

在你的活动中

// Gets all users but replace with whatever list of users you want.
List<User> users = User.all();                  

ArrayAdapter userAdapter = new ArrayAdapter(this, R.layout.spinner, users);

Spinner userSpinner = (Spinner) findViewById(R.id.user);
userSpinner.setAdapter(userAdapter);



// And to get the actual User object that was selected, you can do this.
User user = (User) ( (Spinner) findViewById(R.id.user) ).getSelectedItem();
作者: Joshua Pinter 发布者: 2014 年 1 月 16 日

0

51 作者的声誉

我认为,最好的解决办法是“简单的解决方案”乔什-品特

这对我有用:

//Code of the activity 
//get linearLayout
LinearLayout linearLayout = (LinearLayout ) view.findViewById(R.id.linearLayoutFragment);       

LinearLayout linearLayout = new LinearLayout(getActivity());
//display css
RelativeLayout.LayoutParams params2 = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);

//create the spinner in a fragment activiy
Spinner spn = new Spinner(getActivity());

// create the adapter.
ArrayAdapter<ValorLista> spinner_adapter = new ArrayAdapter<ValorLista>(getActivity(), android.R.layout.simple_spinner_item, meta.getValorlistaList());
spinner_adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
spn.setAdapter(spinner_adapter);

//set the default according to value
//spn.setSelection(spinnerPosition);

linearLayout.addView(spn, params2);
//Code of the class ValorLista

import java.io.Serializable;
import java.util.List;

public class ValorLista implements Serializable{


    /**
     * 
     */
    private static final long serialVersionUID = 4930195743192929192L;
    private int id; 
    private String valor;
    private List<Metadato> metadatoList;


    public ValorLista() {
        super();
        // TODO Auto-generated constructor stub
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getValor() {
        return valor;
    }
    public void setValor(String valor) {
        this.valor = valor;
    }
    public List<Metadato> getMetadatoList() {
        return metadatoList;
    }
    public void setMetadatoList(List<Metadato> metadatoList) {
        this.metadatoList = metadatoList;
    }

    @Override
    public String toString() {  
        return getValor();
    }

}
作者: lopradi 发布者: 2015 年 4 月 12 日

42

3749 作者的声誉

对于简单的解决方案,您只需覆盖对象中的“toString”即可

public class User{
    public int ID;
    public String name;

    @Override
    public String toString() {
        return name;
    }
}

然后你可以使用:

ArrayAdapter<User> dataAdapter = new ArrayAdapter<User>(mContext, android.R.layout.simple_spinner_item, listOfUsers);

这样您的微调器将只显示用户名。

作者: SpyZip 发布者: 2015 年 4 月 14 日

1

5393 作者的声誉

我的自定义对象是

/**
 * Created by abhinav-rathore on 08-05-2015.
 */
public class CategoryTypeResponse {
    private String message;

    private int status;

    private Object[] object;

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public int getStatus() {
        return status;
    }

    public void setStatus(int status) {
        this.status = status;
    }

    public Object[] getObject() {
        return object;
    }

    public void setObject(Object[] object) {
        this.object = object;
    }

    @Override
    public String toString() {
        return "ClassPojo [message = " + message + ", status = " + status + ", object = " + object + "]";
    }

    public static class Object {
        private String name;
        private String _id;
        private String title;
        private String desc;
        private String xhdpi;
        private String hdpi;
        private String mdpi;
        private String hint;
        private String type;
        private Brands[] brands;


        public String getId() {
            return _id;
        }

        public void setId(String id) {
            this._id = id;
        }

        public String getName() {
            return name;
        }

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

        public String getXhdpi() {
            return xhdpi;
        }

        public void setXhdpi(String xhdpi) {
            this.xhdpi = xhdpi;
        }

        public String getHdpi() {
            return hdpi;
        }

        public void setHdpi(String hdpi) {
            this.hdpi = hdpi;
        }

        public String getMdpi() {
            return mdpi;
        }

        public void setMdpi(String mdpi) {
            this.mdpi = mdpi;
        }

        public String get_id() {
            return _id;
        }

        public void set_id(String _id) {
            this._id = _id;
        }

        public String getTitle() {
            return title;
        }

        public void setTitle(String title) {
            this.title = title;
        }

        public String getDesc() {
            return desc;
        }

        public void setDesc(String desc) {
            this.desc = desc;
        }

        public String getHint() {
            return hint;
        }

        public void setHint(String hint) {
            this.hint = hint;
        }

        public String getType() {
            return type;
        }

        public void setType(String type) {
            this.type = type;
        }

        public Brands[] getBrands() {
            return brands;
        }

        public void setBrands(Brands[] brands) {
            this.brands = brands;
        }

        @Override
        public String toString() {
            return "ClassPojo [name = " + name + "]";
        }
    }

    public static class Brands {

        private String _id;
        private String name;
        private String value;
        private String categoryid_ref;

        public String get_id() {
            return _id;
        }

        public void set_id(String _id) {
            this._id = _id;
        }

        public String getName() {
            return name;
        }

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

        public String getValue() {
            return value;
        }

        public void setValue(String value) {
            this.value = value;
        }

        public String getCategoryid_ref() {
            return categoryid_ref;
        }

        public void setCategoryid_ref(String categoryid_ref) {
            this.categoryid_ref = categoryid_ref;
        }

        @Override
        public String toString() {
            return  name;

        }
    }
}

我还想将这个对象设置为我的微调器的适配器源而不扩展ArrayAdapter ,这样我所做的就是。

brandArray = mCategoryTypeResponse.getObject()[fragPosition].getBrands();

ArrayAdapter brandAdapter = new ArrayAdapter< CategoryTypeResponse.Brands>(getActivity(),
                R.layout.item_spinner, brandArray);

现在您将能够在您的微调器中看到结果,诀窍是toString() 在您自定义对象中覆盖,因此您希望在微调器中显示的值只是在此方法中返回。

作者: DeltaCap019 发布者: 2015 年 6 月 5 日

3

2212 作者的声誉

到目前为止,我发现的最简单的方法:

@Override
public String toString() {
    return this.label;           
}

现在,您可以在旋转器中粘贴任何对象,它将显示指定的标签。

作者: NielW 发布者: 2016 年 1 月 10 日

8

81 作者的声誉

只需对Joaquin Alberto的一个小调整就可以解决样式问题。只需在自定义适配器中替换getDropDownView函数,如下所示,

@Override
    public View getDropDownView(int position, View convertView, ViewGroup parent) {
        View v = super.getDropDownView(position, convertView, parent);
        TextView tv = ((TextView) v);
        tv.setText(values[position].getName());
        tv.setTextColor(Color.BLACK);
        return v;
    }
作者: Tirtharup Bhattacharyya 发布者: 2016 年 3 月 31 日

0

81 作者的声誉

天哪,我们能不能继续上课?做就是了:

spinner.adapter = object: ArrayAdapter<Project>(
            container.context,
            android.R.layout.simple_spinner_dropdown_item,
            state.projects
        ) {
            override fun getDropDownView(
                position: Int,
                convertView: View?,
                parent: ViewGroup
            ): View {
                val label = super.getView(position, convertView, parent) as TextView
                label.text = getItem(position)?.title
                return label
            }

            override fun getView(position: Int, convertView: View?, parent: ViewGroup): View {
                val label = super.getView(position, convertView, parent) as TextView
                label.text = getItem(position)?.title
                return label
            }
        }
作者: Juliano Moraes 发布者: 2019 年 1 月 29 日
32x32