自定義佈局的微調不顯示任何Android

Question

在我的應用程序中我必須使用應顯示三項（IT，EN，PR）的微調。我還必須使用個性化佈局。該代碼是在另一個適配器在onCreate方法：

holder.spinnerLenguage = (Spinner) convertView 
       .findViewById(R.id.spinnerLenguage); 
     ArrayList<String> spinnerArray = new ArrayList<String>(); 
     spinnerArray.add("IT"); 
     spinnerArray.add("EN"); 
     spinnerArray.add("PR"); 
     final lenguageSpinnerAdapter lenguageAdapter = new lenguageSpinnerAdapter(
       convertView.getContext(), spinnerArray); 
     holder.spinnerLenguage.setAdapter(lenguageAdapter); 

     holder.spinnerLenguage 
       .setOnItemSelectedListener(new OnItemSelectedListener() 
... 
... 

的適配器類是：

private class lenguageSpinnerAdapter extends ArrayAdapter<String> implements 
     SpinnerAdapter { 

    private ArrayList<String> lenguages; 

    public lenguageSpinnerAdapter(Context context, 
      ArrayList<String> lenguages) { 
     super(context, R.layout.lenguage_item_layout); 
     this.lenguages = lenguages; 
    } 

    @Override 
    public View getDropDownView(int position, View convertView, 
      ViewGroup parent) { 
     // First let's verify the convertView is not null 
     if (convertView == null) { 
      // This a new view we inflate the new layout 
      LayoutInflater inflater = (LayoutInflater) context 
        .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      convertView = inflater.inflate(R.layout.lenguage_item_layout, 
        parent, false); 
     } 

     TextView lenguage = (TextView) convertView 
       .findViewById(R.id.textViewLenguage); 
     lenguage.setText(lenguages.get(position).toString()); 

     return convertView; 

    } 

} 

編輯：與getCount將錯誤是：

07-11 11:09:20.222: E/AndroidRuntime(32564): FATAL EXCEPTION: main 
07-11 11:09:20.222: E/AndroidRuntime(32564): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.app/com.app.FlipMainActivity}: java.lang.IllegalStateException: ArrayAdapter requires the resource ID to be a TextView 
07-11 11:09:20.222: E/AndroidRuntime(32564): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2247) 
07-11 11:09:20.222: E/AndroidRuntime(32564): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2297) 
07-11 11:09:20.222: E/AndroidRuntime(32564): at android.app.ActivityThread.access$700(ActivityThread.java:152) 
07-11 11:09:20.222: E/AndroidRuntime(32564): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1282) 
07-11 11:09:20.222: E/AndroidRuntime(32564): at android.os.Handler.dispatchMessage(Handler.java:99) 
07-11 11:09:20.222: E/AndroidRuntime(32564): at android.os.Looper.loop(Looper.java:137) 
07-11 11:09:20.222: E/AndroidRuntime(32564): at android.app.ActivityThread.main(ActivityThread.java:5328) 
07-11 11:09:20.222: E/AndroidRuntime(32564): at java.lang.reflect.Method.invokeNative(Native Method) 
07-11 11:09:20.222: E/AndroidRuntime(32564): at java.lang.reflect.Method.invoke(Method.java:511) 
07-11 11:09:20.222: E/AndroidRuntime(32564): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102) 
07-11 11:09:20.222: E/AndroidRuntime(32564): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869) 
07-11 11:09:20.222: E/AndroidRuntime(32564): at dalvik.system.NativeStart.main(Native Method) 
07-11 11:09:20.222: E/AndroidRuntime(32564): Caused by: java.lang.IllegalStateException: ArrayAdapter requires the resource ID to be a TextView 
07-11 11:09:20.222: E/AndroidRuntime(32564): at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:386) 
07-11 11:09:20.222: E/AndroidRuntime(32564): at android.widget.ArrayAdapter.getView(ArrayAdapter.java:362) 
07-11 11:09:20.222: E/AndroidRuntime(32564):  
07-11 11:09:20.222: E/AndroidRuntime(32564): at android.widget.Spinner.onMeasure(Spinner.java:443) 
07-11 11:09:20.222: E/AndroidRuntime(32564): at android.view.View.measure(View.java:16059) 
071 11:09:20.222: E/AndroidRuntime(32564): at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:681) 
07-11 11:09:20.222: E/AndroidRuntime(32564): at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461) 
07-11 11:09:20.222: E/AndroidRuntime(32564): at android.view.View.measure(View.java:16059) 
07-11 11:09:20.222: E/AndroidRuntime(32564): at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:681) 
... 
... 
07-11 11:09:20.222: E/AndroidRuntime(32564): Caused by: java.lang.ClassCastException: android.widget.RelativeLayout cannot be cast to android.widget.TextView 
07-11 11:09:20.222: E/AndroidRuntime(32564): at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:379) 
07-11 11:09:20.222: E/AndroidRuntime(32564): ... 29 more 

旋轉器是繪製在佈局但沒有物品。有任何想法嗎？

Answer 1

嘗試實施以下代碼而不是您的代碼。

private class lenguageSpinnerAdapter extends BaseAdapter implements 
     SpinnerAdapter { 

    private ArrayList<String> lenguages; 

    public lenguageSpinnerAdapter(Context context, 
      ArrayList<String> lenguages) { 
     this.lenguages = lenguages; 
    } 

    public int getCount() { 
     return lenguages.size(); 
    } 

    public Object getItem(int position) { 
     return lenguages.get(position); 
    } 

    public long getItemId(int position) { 
     return position; 
    } 

    public View getView(int position, View convertView, ViewGroup parent) { 
     if (convertView == null) { 
      // This a new view we inflate the new layout 
      LayoutInflater inflater = (LayoutInflater) getApplicationContext() 
        .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      convertView = inflater.inflate(R.layout.get_exercise_activity, 
        parent, false); 
     } 

     TextView lenguage = (TextView) convertView 
       .findViewById(R.id.btnSave); 
     lenguage.setText(lenguages.get(position).toString()); 

     return convertView; 
    } 

} 

Answer 2

請參閱Android Spinner Dropdown Example教程這將幫助你。