我想设置微调器以显示名称country,即使选择了任何其他列表也是如此。我使用了一个textview来显示Spinner List的选定项目。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。我经历了各种有关此问题的回答,但无法找到合适的回复
我正在附上我的代码
MainActivity.java
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;
}
}
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>
我的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>
我的要求是在微调框中选择的任何内容,Textview应显示所选的项目,但微调框应始终显示第一个项目或在我的情况下显示国家
答案 0 :(得分:12)
使用此代码
声明
String selected, spinner_item;
微调代码
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) {
}
});
答案 1 :(得分:8)
spinner.setPrompt("Pick One");
答案 2 :(得分:2)
在微调器中使用android:prompt="@string/select"
....
答案 3 :(得分:2)
这样做。 将textView setSelection设置为微调器列表的第0个位置
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);
}
}
答案 4 :(得分:2)
您只需要3行代码:
(1)声明一个全局变量,用于保存和加载微调器项ID。通过全局,我的意思是在公共类MainActivity扩展Activity {&#34;。
之后立即宣布它int mySpinner_selectedId;
(2)然后,在用户做出选择之后添加以下代码。一个好的位置是与您的微调器一起出现的按钮。
mySpinner_selectedId = mySpinner.getSelectedItemPosition();
(3)最后,在&#34; mySpinner.setAdapter(adapter);&#34;之后添加以下代码。加载最后选择的项目。
mySpinner.setSelection(mySpinner_selectedId);
你最受欢迎。
答案 5 :(得分:1)
试试这种方式。
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);
}
}
我希望这会对你有所帮助。让我知道发生什么事。谢谢。
答案 6 :(得分:1)
试试这个:
public void onItemSelected(AdapterView<?> parent, View view,
int pos, long id) {
spinner.setSelection(pos);
}
答案 7 :(得分: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");
}
});
答案 8 :(得分:0)
在onItemSelected
方法中添加此代码sp.setSelection(0);
答案 9 :(得分:0)
我以一种简单的方式完成了这项工作
在适配器第一个或结束位置添加默认文本(在我的情况下结束)和将此项目设置为默认选择。 ----同时获取默认选择位置,以便在setOnItemSelectedListener()中不执行任何操作。
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();
检查所选位置是默认文本位置
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) {
}
});
答案 10 :(得分:0)
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) {
}
});