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！
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：
Spinnerarray.xml文件中定义2个相等大小的数组 - 一个用于标签，一个用于值数组Spinner设置你的android:entries="@array/labels" String selectedVal = getResources().getStringArray(R.array.values)[spinner.getSelectedItemPosition()];
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：
EditText）？ArrayAdapter的答案是：
row.xml或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。.setText()方法将与支持数据结构中项目的字符串格式一起使用。字符串格式将通过在项目上调用.toString()获得。custom ListView demo.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。
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);
现在你将能够在你的微调器中看到结果，诀窍是在自定义对象中覆盖toString()，所以你想要在微调器中显示的值只是在这个方法中返回。
我认为最好的解决方案是"Simplest Solution"的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();
}
}
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
}
}
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) { }
});
}
}
在SO上搜索不同的解决方案之后，我发现以下是用自定义Spinner填充Objects的最简单和最干净的解决方案。这是完整的实现：
public class User{
public int ID;
public String name;
@Override
public String toString() {
return this.name; // What to display in the Spinner list.
}
}
<?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" />
<?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>
// 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();
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。
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;
}
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！
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;
}
}
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 ..... :)
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。