如何获取微调器选定项目的文本?
当我点击保存按钮时,我必须在我的微调器中选择项目上的文本。我需要文本而不是索引。
Spinner spinner = (Spinner)findViewById(R.id.spinner);
String text = spinner.getSelectedItem().toString();
TextView textView = (TextView)mySpinner.getSelectedView();
String result = textView.getText().toString();
您必须使用索引和适配器来找出您拥有的文本
请参阅此 Spinner 示例
public class MyOnItemSelectedListener implements OnItemSelectedListener {
public void onItemSelected(AdapterView<?> parent,
View view, int pos, long id) {
Toast.makeText(parent.getContext()), "The planet is " +
parent.getItemAtPosition(pos).toString(), Toast.LENGTH_LONG).show();
}
public void onNothingSelected(AdapterView parent) {
// Do nothing.
}
}
Spinner 为您返回数组的整数值。您必须根据索引检索字符串值。
Spinner MySpinner = (Spinner)findViewById(R.id.spinner);
Integer indexValue = MySpinner.getSelectedItemPosition();
用这个
import java.util.ArrayList;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.text.Editable;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.Toast;
public class dynamic_spinner_main extends Activity {
private Spinner m_myDynamicSpinner;
private EditText m_addItemText;
private ArrayAdapter<CharSequence> m_adapterForSpinner;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_spinner);
///////////////////////////////////////////////////////////////
//grab our UI elements so we can manipulate them (in the case of the Spinner)
// or add listeners to them (in the case of the buttons)
m_myDynamicSpinner = (Spinner)findViewById(R.id.dynamicSpinner);
m_addItemText = (EditText)findViewById(R.id.newSpinnerItemText);
Button addButton = (Button)findViewById(R.id.AddBtn);
Button clearButton = (Button)findViewById(R.id.ClearBtn);
////////////////////////////////////////////////////////////////
//create an arrayAdapter an assign it to the spinner
m_adapterForSpinner = new ArrayAdapter(this, android.R.layout.simple_spinner_item);
m_adapterForSpinner.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
m_myDynamicSpinner.setAdapter(m_adapterForSpinner);
m_adapterForSpinner.add("gr");
m_myDynamicSpinner.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parentView, View selectedItemView, int position, long id) {
// your code here
Intent mIntent=new Intent(dynamic_spinner_main.this,sampleLocalization.class);
mIntent.putExtra("lang", m_myDynamicSpinner.getItemIdAtPosition(position));
System.out.println("Spinner value...."+m_myDynamicSpinner.getSelectedItem().toString());
startActivity(mIntent);
}
@Override
public void onNothingSelected(AdapterView<?> parentView) {
// your code here
}
});
////////////////////////////////////////////////////////////////
//add listener for addButton
addButton.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
addNewSpinnerItem();
}
});
////////////////////////////////////////////////////////////////
//add listener for addButton
clearButton.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
clearSpinnerItems();
}
});
}
private void addNewSpinnerItem() {
CharSequence textHolder = "" + m_addItemText.getText();
m_adapterForSpinner.add(textHolder);
}
private void clearSpinnerItems() {
m_adapterForSpinner.clear();
m_adapterForSpinner.add("dummy item");
}
}
main_spinner.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<EditText android:layout_height="wrap_content"
android:layout_margin="4px"
android:id="@+id/newSpinnerItemText"
android:layout_width="fill_parent"></EditText>
<Button android:layout_height="wrap_content"
android:id="@+id/AddBtn"
android:layout_margin="4px"
android:layout_width="fill_parent"
android:text="Add To Spinner"></Button>
<Button android:layout_height="wrap_content"
android:id="@+id/ClearBtn"
android:layout_margin="4px"
android:layout_width="fill_parent"
android:text="Clear Spinner Items"></Button>
<Spinner android:layout_height="wrap_content"
android:id="@+id/dynamicSpinner"
android:layout_margin="4px"
android:layout_width="fill_parent"></Spinner>
</LinearLayout>
spinner_button.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?>arg0, View view, int arg2, long arg3) {
String selected_val=spinner_button.getSelectedItem().toString();
Toast.makeText(getApplicationContext(), selected_val ,
Toast.LENGTH_SHORT).show();
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
});
}
一行版本:
String text = ((Spinner)findViewById(R.id.spinner)).getSelectedItem().toString();
更新: 如果您使用 SDK 26(或更新版本)编译您的项目,您可以删除强制转换。
String text = findViewById(R.id.spinner).getSelectedItem().toString();
设置微调器适配器后,此代码将有所帮助
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
Toast.makeText(getApplicationContext(), "This is " +
adapterView.getItemAtPosition(i).toString(), Toast.LENGTH_LONG).show();
try {
//Your task here
}catch (Exception e)
{
e.printStackTrace();
}
}
@Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
});
TextView textView = (TextView) spinActSubTask.getSelectedView().findViewById(R.id.tvProduct);
String subItem = textView.getText().toString();
也可以使用这样的方式以更安全的方式实现String.valueOf()
Spinner sp = (Spinner) findViewById(R.id.sp_id);
String selectedText = String.valueOf(sp.getSelectedItem());
当一切都崩溃时,不会导致应用程序崩溃。其安全性背后的原因是具有处理null
对象作为参数的能力。文件说
如果参数是
null
,则字符串等于"null"
; 否则,obj.toString()
返回 的值。
因此,有一些保险,以防有空 Spinner
,例如,当前选定的项目必须转换为String
.
对于基于 CursorAdapter 的微调器:
spinner.getSelectedItemId()
从您的数据库中获取项目名称,例如:
public String getCountryName(int pId){
Cursor cur = mDb.query(TABLE, new String[]{COL_NAME}, COL_ID+"=?", new String[]{pId+""}, null, null, null);
String ret = null;
if(cur.moveToFirst()){
ret = cur.getString(0);
}
cur.close();
return ret;
}
对于那些有基于HashMap的微调器:
((HashMap)((Spinner)findViewById(R.id.YourSpinnerId)).getSelectedItem()).values().toArray()[0].toString();
如果您在除主要活动之外的片段、适配器或类中,请使用以下命令:
((HashMap)((Spinner)YourInflatedLayoutOrView.findViewById(R.id.YourSpinnerId)).getSelectedItem()).values().toArray()[0].toString();
仅供参考;您应该在 onClick 方法之前找到您的视图的 ID 。
Spinner spinner = (Spinner) findViewById(R.id.yourspinnerid);
String text = spinner.getSelectedItem().toString();