недействительность или вопросник?

Question

Я искал здесь довольно долгое время, но не смог найти свою текущую проблему (хотя и много других).

Я создал счетчик с прослушивателем, и внутри этого слушателя я пытаюсь вызвать недействительность ListView, который представлен на onCreate. Теперь счетчик содержит языки, и в зависимости от языка в ListView должны быть представлены разные вещи. Проблема в том, что когда я выбираю элемент в счетчике, ничего не происходит вообще.

Моя основная деятельность:

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 

} 

}

И мой 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; 
    } 
} 

}

Кроме того, у меня нет ошибок logCat.

Любая помощь очень ценится.

Answer 1

Где вы звоните addListenertoSpinner();? Назовите его, объявив свой Spinner

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; 
    } 
}