Android 如何将默认文本设置为微调器
我想将微调器设置为显示国家/地区名称,即使选择了任何其他列表。我使用了一个textview,它显示微调器列表的选定项。当我使用setselection方法将微调器标题设置为Country时,EditText最终也会更改。我浏览了关于这个问题的各种回答,但找不到合适的回答 我在下面附上我的代码 MainActivity.javaAndroid 如何将默认文本设置为微调器,android,spinner,Android,Spinner,我想将微调器设置为显示国家/地区名称,即使选择了任何其他列表。我使用了一个textview,它显示微调器列表的选定项。当我使用setselection方法将微调器标题设置为Country时,EditText最终也会更改。我浏览了关于这个问题的各种回答,但找不到合适的回答 我在下面附上我的代码 MainActivity.java package com.example.spinner; import android.os.Bundle; import android.app.Activity;
package com.example.spinner;
import android.os.Bundle;
import android.app.Activity;
import android.database.Cursor;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;
public class MainActivity extends Activity {
Spinner sp;
TextView t;
String[] country;
int sp_position;
String selected;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
String myString = "Country";
sp = (Spinner)findViewById(R.id.spinner1);
t = (TextView)findViewById(R.id.textView1);
country = getResources().getStringArray(R.array.spinner);
ArrayAdapter<String> ad = new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_spinner_dropdown_item,country);
sp_position = ad.getPosition(myString);
sp.setAdapter(ad);
ad.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
sp.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
selected = sp.getSelectedItem().toString();
System.out.println(selected);
setid();
}
private void setid() {
sp.setSelection(sp_position);
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
});
t.setText(selected);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
package com.example.spinner;
导入android.os.Bundle;
导入android.app.Activity;
导入android.database.Cursor;
导入android.view.Menu;
导入android.view.view;
导入android.widget.AdapterView;
导入android.widget.AdapterView.OnItemSelectedListener;
导入android.widget.ArrayAdapter;
导入android.widget.Spinner;
导入android.widget.TextView;
公共类MainActivity扩展了活动{
纺纱机;
文本视图t;
字符串[]国家;
int sp_位置;
选择字符串;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
字符串myString=“Country”;
sp=(喷丝器)findViewById(R.id.spinner1);
t=(TextView)findViewById(R.id.textView1);
country=getResources().getStringArray(R.array.spinner);
ArrayAdapter ad=新的ArrayAdapter(MainActivity.this,android.R.layout.simple\u spinner\u dropdown\u item,country);
sp_position=ad.getPosition(myString);
sp.setAdapter(ad);
ad.setDropDownViewResource(android.R.layout.simple\u微调器\u下拉菜单\u项);
sp.setOnItemSelectedListener(新的OnItemSelectedListener(){
@凌驾
已选择公共视图(AdapterView arg0、视图arg1、,
整数arg2,长arg3){
selected=sp.getSelectedItem().toString();
系统输出打印项次(选中);
setid();
}
私有void setid(){
sp.setSelection(sp_位置);
}
@凌驾
未选择公共无效(AdapterView arg0){
//TODO自动生成的方法存根
}
});
t、 setText(选定);
}
@凌驾
公共布尔onCreateOptions菜单(菜单){
//为菜单充气;这会将项目添加到操作栏(如果存在)。
getMenuInflater().充气(R.menu.main,menu);
返回true;
}
}
我的XML文件
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="48dp"
android:layout_marginTop="69dp"
android:maxLines="4"
android:hint="Address" />
<Spinner
android:id="@+id/spinner1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignRight="@+id/textView1"
android:layout_below="@+id/textView1"
android:layout_marginTop="72dp"
/>
</RelativeLayout>
My STRINGS.XML
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">Spinner</string>
<string name="action_settings">Settings</string>
<string name="hello_world">Hello world!</string>
<string-array name="spinner">
<item>Country</item>
<item>India</item>
<item>Russia</item>
<item>USA</item>
<item>France</item>
<item>United Kingdom</item>
</string-array>
<string name ="Country">Country</string>
</resources>
纺纱机
设置
你好,世界!
国家
印度
俄罗斯
美国
法国
大不列颠联合王国
国家
我的要求是无论在微调器中选择了什么,Textview都应显示所选项目,但微调器应始终显示第一个项目,或者在我的国家/地区使用android:prompt=“@string/select”
在微调器中….使用此代码
声明
String selected, spinner_item;
微调器代码
sp.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
selected = sp.getSelectedItem().toString();
if (!selected.equals("Country"))
spinner_item = selected;
System.out.println(selected);
setid();
}
private void setid() {
sp.setSelection(sp_position);
t.setText(spinner_item);
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
}
});
sp.setOnItemSelectedListener(新的OnItemSelectedListener(){
@凌驾
已选择公共视图(AdapterView arg0、视图arg1、内部arg2、长arg3){
selected=sp.getSelectedItem().toString();
如果(!selected.equals(“国家”))
微调器\项目=已选择;
系统输出打印项次(选中);
setid();
}
私有void setid(){
sp.setSelection(sp_位置);
t、 setText(微调器_项);
}
@凌驾
未选择公共无效(AdapterView arg0){
}
});
这样做。
将textView setSelection设置为微调器列表的第0个位置后
sp.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
selected = sp.getSelectedItem().toString();
System.out.println(selected);
t.setText(selected);
sp.setSelection(0);
}
}
sp.setOnItemSelectedListener(新的OnItemSelectedListener(){
@凌驾
已选择公共视图(AdapterView arg0、视图arg1、,
整数arg2,长arg3){
selected=sp.getSelectedItem().toString();
系统输出打印项次(选中);
t、 setText(选定);
sp.1(0);
}
}
试试这个
Countryspinner.setOnItemSelectedListener(new OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> arg0, View arg1,
int position, long arg3) {
if (position == 0) {
txtSpinner1.setHint("Select Country");
} else {
txtSpinner1.setText(CountryList.get(position));
}
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
txtSpinner1.setHint("Select Country");
}
});
Countryspinner.setOnItemSelectedListener(新的OnItemSelectedListener(){
已选择公共视图(AdapterView arg0、视图arg1、,
整数位置,长arg3){
如果(位置==0){
txtSpinner1.setHint(“选择国家”);
}否则{
txtSpinner1.setText(CountryList.get(position));
}
}
@凌驾
未选择公共无效(AdapterView arg0){
//TODO自动生成的方法存根
txtSpinner1.setHint(“选择国家”);
}
});
在onItemSelected
方法中添加此代码sp.setSelection(0);
试试这种方法
sp.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
//selected = sp.getSelectedItem().toString();
//System.out.println(selected);
if(arg2!=0)
t.setText(sp.getSelectedItem().toString());
sp.setSelection(0);
}
}
sp.setOnItemSelectedListener(新的OnItemSelectedListener(){
@凌驾
已选择公共视图(AdapterView arg0、视图arg1、,
整数arg2,长arg3){
//selected=sp.getSelectedItem().toString();
//系统输出打印项次(选中);
如果(arg2!=0)
t、 setText(sp.getSelectedItem().toString());
sp.1(0);
}
}
我希望这会对您有所帮助。让我知道会发生什么。谢谢。试试这个:
spinner.setPrompt("Pick One");
public void onItemSelected(AdapterView<?> parent, View view,
int pos, long id) {
spinner.setSelection(pos);
}
public void未选中(AdapterView父视图、视图、,
内部位置,长id){
微调器。设置选择(pos);
}
此操作只需3行代码:
(1) 声明一个用于保存和加载微调器项ID的全局变量。所谓全局,我的意思是在“public class MainActivity extensed Activity{”之后声明它
(2) 然后,在用户做出选择后添加以下代码。一个好的位置是与微调器一起出现的按钮
mySpinner_selectedId = mySpinner.getSelectedItemPosition();
(3) 最后,在“mySpinner.setAdapter(adapter);”之后添加以下代码以加载最后选择的项
mySpinner.setSelection(mySpinner_selectedId);
非常欢迎您。我用一种简单的方式做了这件事
mySpinner.setSelection(mySpinner_selectedId);
taskName.add("one");
taskName.add("two");
taskName.add("select a task");
ArrayAdapter<String> adapter = new ArrayAdapter<>(this, android.R.layout.simple_spinner_dropdown_item, taskName);
binding.spnTask.setAdapter(adapter);
binding.spnTask.setSelection(adapter.getPosition("select a task name"));
final int defaultPosition = binding.spnTask.getSelectedItemPosition();
binding.spnTask.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
if (position == defaultPosition) {
Toast.makeText(this, "No Action", Toast.LENGTH_SHORT).show();
}else{ Toast.makeText(this, "Your Action" , Toast.LENGTH_SHORT).show(); }
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
mySpinner = (Spinner) findViewById(R.id.spinner);
mySpinner.setPrompt("Categorie");
final ArrayList<String> strDeviceArr = new ArrayList<>();
mySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
String valueSelected = mySpinner.getSelectedItem().toString();
if(!valueSelected.equals("Categorie"))
Toast.makeText(MenuActivity.this, ""+valueSelected, Toast.LENGTH_SHORT).show();
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});