我现在已经在这里搜索了很长时间，但是找不到我当前的问题（虽然还有很多其他问题）。
我创建了一个带有侦听器的微调器，并且在该侦听器中，我试图调用onCreate中显示的ListView的失效。 现在，微调器包含语言，并且根据语言，ListView中将显示不同的东西。问题是，当我在微调器中选择一个项目时，根本没有任何事情发生。
我的主要活动：
public class MainActivity extends Activity implements OnItemSelectedListener {
public final static String EXTRA_MESSAGE = "com.example.myfirstapp.MESSAGE";
private ListView termsListView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
String selectedLanguage = "";
createListView(selectedLanguage);
}
public void createListView(String selectedLanguage)
{
termsListView = (ListView) findViewById(R.id.termsListView);
SharedPreferences sharedPref = getSharedPreferences("Language", 0);
String language = sharedPref.toString();
// Initialize the terms array
Term [] items = {
new Term(1, "Acceptance", "The process of assessing whether a system satisfies all its requirements", false, "Acceptans", "", language),
new Term(2, "Acceptance test", "A test that assesses whether a system satisfies all its requirements", false, "Acceptans test", "", language),
new Term(3, "Activity diagram", "A diagram type in UML which models the flow of actions in a system or in a component including data flows and areas of responsibility where necessary", false, "Aktivitets diagram", "", language),
new Term(4, "Actor", "1. Generally in RE: A person, a system or a technical device in the context of a system that interacts with the system.2. Especially in goal-oriented RE: a person, a system or a technical device that may act and process information in order to achieve some goals", false, "Aktör", "", language),
};
ArrayAdapter<Term> adapter = new ArrayAdapter<Term>(this,android.R.layout.simple_list_item_1, items);
termsListView.setAdapter(adapter);
termsListView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
String item = ((TextView)view).getText().toString();
Intent intent = new Intent(view.getContext(), DisplayDescription.class);
intent.putExtra(EXTRA_MESSAGE, item);
startActivity(intent);
}
});
createSpinner();
}
public void createSpinner(){
Spinner spinner = (Spinner) findViewById(R.id.languageSpinner);
// Create an ArrayAdapter using the string array and a default spinner layout
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,
R.array.languages_array, android.R.layout.simple_spinner_item);
// Specify the layout to use when the list of choices appears
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// Apply the adapter to the spinner
spinner.setAdapter(adapter);
}
public void addListenertoSpinner(){
final Spinner spinner1 = (Spinner) findViewById(R.id.languageSpinner);
spinner1.setOnItemSelectedListener(new OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
String spinnerValue = spinner1.getSelectedItem().toString();
SharedPreferences sharedPref = getSharedPreferences("Language", 0);
SharedPreferences.Editor editedPrefs = sharedPref.edit();
editedPrefs.putString("Language", spinnerValue);
editedPrefs.commit();
termsListView.invalidate();
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
});
}
@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;
}
//@Override
public void onItemSelected(AdapterView<?> parent, View view, int pos,
long id) {
// TODO Auto-generated method stub
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
}
我的XML：
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/scrollMainActivityLayout"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayout
android:id="@+id/activityMainLayout"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
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:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/selectLanguageTitle" />
<RelativeLayout android:layout_width="fill_parent"
android:layout_height="fill_parent">
<Spinner
android:id="@+id/languageSpinner"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:prompt="@string/languages_prompt"/>
<Button
android:id="@+id/languageButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="@id/languageSpinner"
android:text="@string/languageButtonTitle"/>
</RelativeLayout>
<TextView android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/glossaryTitle" />
<ListView
android:id="@+id/termsListView"
android:layout_width="fill_parent"
android:layout_height="310dp">
</ListView>
</LinearLayout>
Term.java
package se.inceptive.irebglossary;
import java.util.ArrayList;
import android.content.Context;
//import android.content.SharedPreferences;
public class Term extends MainActivity{
private int termId;
private String termNameEnglish;
private String termDescriptionEnglish;
private boolean termJA;
private String termNameSwedish;
private String termDescriptionSwedish;
private static ArrayList<Term> terms;
// private String selectedLanguage;
private Context context;
private String termSetLanguage;
public Term(){
super();
}
public Term(int collectId, String collectEnglish, String collectDescriptionEnglish, boolean collectJA, String collectSwedish, String collectDescriptionSwedish, String collectLanguage) {
super();
this.termId = collectId;
this.termNameEnglish = collectEnglish;
this.termDescriptionEnglish = collectDescriptionEnglish;
this.termJA = collectJA;
this.termNameSwedish = collectSwedish;
this.termDescriptionSwedish = collectDescriptionSwedish;
this.termSetLanguage = collectLanguage;
if(terms == null)
terms = new ArrayList<Term>();
terms.add(this);
}
public static String getDescriptionFromName(String name)
{
for(Term term : terms)
{
if(name.equals(term.termNameEnglish))
return term.termDescriptionEnglish;
if(name.equals(term.termNameSwedish))
return term.termDescriptionSwedish;
}
return null;
}
@Override
public String toString() {
//String selectedLanguage = Context.getPreferences().toString();
//String selectedLanguage = this.context.getResources().getString(R.string.selectedLanguage);
if(termSetLanguage.equals("English"))
{
return this.termNameEnglish;
}
if(termSetLanguage.equals("Svenska"))
{
return this.termNameSwedish;
}
else
{
return this.termNameEnglish;
}
}
}
另外，我没有收到任何logCat错误。
非常感谢任何帮助。
答案 0 :(得分：0)
你在哪里打电话给addListenertoSpinner();？在声明您的Spinner后调用它
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
String languages={"English","Spanish","french"};
termsListView = (ListView) findViewById(R.id.termsListView);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, listdata(0));
termsListView.setAdapter(adapter);
Spinner spinner = (Spinner) findViewById(R.id.languageSpinner);
// Create an ArrayAdapter using the string array and a default spinner layout
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,
languages, android.R.layout.simple_spinner_item);
// Specify the layout to use when the list of choices appears
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// Apply the adapter to the spinner
spinner.setAdapter(adapter);
spinner.setOnItemSelectedListener(new OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
String spinnerValue = spinner.getSelectedItem().toString();
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, listdata(pos));
termsListView.setAdapter(adapter);// here we will update the listview data according to selected language
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
});
}
public String[] listdata(int language)
{
if(language==0)
{
String languagearray[]={"English-One","English-Two"};
return languagearray;
}
else if(language==1)
{
String languagearray[]={"Spanish-One","Spanish-Two"};
return languagearray;
}
else
{
String languagearray[]={"French-One","French-Two"};
return languagearray;
}
}