最简单的解决方案

Question

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

用户是具有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称列表并将微调器项目绑定到ID的微调器，以便在选择/更改微调器项目时，将变量currentID设置为适当的值。

如果有人能够展示所描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！

Answer 1

我知道线程已经老了，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;
    }
}

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) {  }
        });
    }
}

Answer 2

最简单的解决方案

在SO上搜索不同的解决方案后，我发现以下是使用自定义Spinner填充Objects的最简单，最干净的解决方案。这是完整的实施：

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>

在您的活动中

// 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();

Answer 3

对于简单的解决方案，您只需覆盖＆＃34; toString＆＃34;在你的对象

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);

这样您的微调器就会只显示用户名。

Answer 4

你可以look at this answer。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：

只需按常规方式创建Spinner
在array.xml文件中定义2个相等大小的数组 - 一个用于标签的数组，一个用于值的数组
使用Spinner

android:entries="@array/labels"

当你需要一个值时，做一些这样的事情（不，你不必链接它）：

  String selectedVal = getResources().getStringArray(R.array.values)[spinner.getSelectedItemPosition()];

Answer 5

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;
    }

Answer 6

对我来说很好，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！

Answer 7

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;
}
}

另外我认为您可以替换List by Array，这样您就不需要在列表中进行排序，但我有一个List ..... :)

Answer 8

受Joaquin Alberto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;
    }
}

Answer 9

到目前为止，我找到的最简单的方法是：

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

现在你可以在你的微调器中粘贴任何对象，它将显示指定的标签。

Answer 10

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：

哪个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？
如何从数据结构（您的类'对象）中提取数据以及如何根据此数据设置小部件或复合视图的EditText字段？

ArrayAdapter的答案是：

任何索引的每个窗口小部件（即row.xml或android.R.layout.simple_spinner_item）都是相同的，并且从ID已赋予ArrayAdapter构造函数的资源中膨胀。
每个小部件都应该是TextView的实例（或者后裔）。小部件的.setText()方法将与。{ 支持数据结构中项的字符串格式。该字符串格式将通过在项目上调用.toString()来获得。

<强> 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];
    }

  }

}

<强> 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>

<强> 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，我希望它有用。

Answer 11

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;

        }
    }
}

我还想将此对象设置为我的微调器的适配器源，而不扩展 ArrayAdapter 以便我所做的就是。

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，诀窍是覆盖自定义对象中的toString()，因此您希望在微调器中显示的值只是返回在这种方法中。

Answer 12

kotlin：

data class User(
    var id: Long,
    var name : String? ){

    override fun toString(): String {
        return name
    }
}

实施

 mBinding.ddUser.setOnItemClickListener { parent, view, position, id ->
            val user = adapter.getItem(position)
            Log.i("idUser","${user?.idtoString()} - ${user?.name}")
        }

Answer 13

我认为最好的解决方案是"Simplest Solution" Josh Pinter。

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();
    }

}

Answer 14

如果您不需要单独的类，那么我的意思是仅将一个简单的适配器映射到您的对象上。这是我基于提供的ArrayAdapter函数的代码。

并且因为您可能需要在创建适配器后添加项目（例如，数据库项目异步加载）。

简单但有效。

editCategorySpinner = view.findViewById(R.id.discovery_edit_category_spinner);

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

// attaching data adapter to spinner, as you can see i have no data at this moment
editCategorySpinner.setAdapter(dataAdapter);
final ArrayAdapter<Category> dataAdapter = new ArrayAdapter<Category>

(getActivity(), android.R.layout.simple_spinner_item, new ArrayList<Category>(0)) {


        // 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)
            Category item = getItem(position);
            label.setText(item.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);
            Category item = getItem(position);
            label.setText(item.getName());

            return label;
        }
    };

然后您可以使用此代码（我无法将Category []放在适配器构造函数中，因为数据是分别加载的）。

请注意，adapter.addAll（items）通过在内部调用notifyDataSetChanged（）刷新微调器。

categoryRepository.getAll().observe(this, new Observer<List<Category>>() {

            @Override
            public void onChanged(@Nullable final List<Category> items) {
                dataAdapter.addAll(items);
            }
});

Answer 15

这是Kotlin中的完整过程：

微调器适配器类：

class CustomSpinnerAdapter(
    context: Context,
    textViewResourceId: Int,
    val list: List<User>
) : ArrayAdapter<User>(
    context,
    textViewResourceId,
    list
) {
    override fun getCount() = list.size

    override fun getItem(position: Int) = list[position]

    override fun getItemId(position: Int) = list[position].report.toLong()

    override fun getView(position: Int, convertView: View?, parent: ViewGroup): View {
        return (super.getDropDownView(position, convertView, parent) as TextView).apply {
            text = list[position].name
        }
    }

    override fun getDropDownView(position: Int, convertView: View?, parent: ViewGroup): View {
        return (super.getDropDownView(position, convertView, parent) as TextView).apply {
            text = list[position].name
        }
    }
}

像这样在您的活动/片段中使用它：

spinner.adapter = CustomerSalesSpinnerAdapter(
            context,
            R.layout.cuser_spinner_item,
            userList
        )

Answer 16

**Easy & Simple Solution**

overide the below method in model class.


 @NonNull
 @Override
 public String toString() {
  return name; //whatever the value which you want to show in spinner list.
    }

Add the below line to set adapter.

spinner.setAdapter(new ArrayAdapter<ModelClassName>(getContext(),R.layout.item_spinner,list));

Answer 17

要做：

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
            }
        }

Android：如何将微调器绑定到自定义对象列表？

17 个答案:

最简单的解决方案

User.java

RES /布局/ spinner.xml

RES /布局/ your_activity_view.xml

在您的活动中

kotlin：