單擊微調框時獲得空指針

在我的片段中，我有一個微調框。這裏是我的代碼：單擊微調框時獲得空指針

public class TaskFragment extends Fragment implements OnItemSelectedListener{ 

private Spinner spinner; 
String tag="[TaskFragment]"; 
@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
     Bundle savedInstanceState) { 
    View fragmentView = inflater.inflate(R.layout.task_fragment, container, 
      false); 
    EditText titleEdit = (EditText) fragmentView 
      .findViewById(R.id.editText1); 
    titleEdit.requestFocus(); 
    String[] priArray = new String[] { "بسیار زیاد", "زیاد", "متوسط", "کم", 
      "بسیار کم" }; 
    String[] statusArray = new String[] { "شروع کار", "در حال انجام", 
      "متوقف", "لغو", "اتمام" }; 
    spinner = (Spinner) fragmentView.findViewById(R.id.spinner1); 
    spinner.setAdapter(new MyArrayAdapter(getActivity(), 
      android.R.layout.simple_spinner_item, R.id.textView1, priArray)); 
    spinner.setOnItemSelectedListener(this); 
    // -------------------------- 
    return fragmentView; 
} 

private class MyArrayAdapter extends ArrayAdapter<String> { 

    private String[] objects; 
    private Context context; 

    public MyArrayAdapter(Context context, int resource, 
      int textViewResourceId, String[] objects) { 
     super(context, resource, textViewResourceId, objects); 
     this.context = context; 
     this.objects = objects; 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     LayoutInflater inflater = (LayoutInflater) context 
       .getSystemService(Service.LAYOUT_INFLATER_SERVICE); 
     View view = inflater.inflate(R.layout.spinner_row, parent,false); 
     MyTextView tv = (MyTextView) view.findViewById(R.id.textView1); 
     tv.setText(objects[position]); 
     return view; 
    } 
} 

@Override 
public void onStart() { 
    Log.d("checking", "[TaskFragment]onstart"); 
    super.onStart(); 
} 

@Override 
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, 
     long arg3) { 
    Log.d("checking", tag+"position: "+arg2); 
} 

@Override 
public void onNothingSelected(AdapterView<?> arg0) { 

} 

}

我在我的佈局中有一個spinner1 id的微調器。一切都很好，並微調器顯示的第一個項目很好，但是當我點擊它，選擇不同的項目出現異常：

09-30 23:54:29.249: E/AndroidRuntime(16399): FATAL EXCEPTION: main 
09-30 23:54:29.249: E/AndroidRuntime(16399): java.lang.NullPointerException 
09-30 23:54:29.249: E/AndroidRuntime(16399): at      android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:353) 
09-30 23:54:29.249: E/AndroidRuntime(16399): at android.widget.ArrayAdapter.getDropDownView(ArrayAdapter.java:376) 
09-30 23:54:29.249: E/AndroidRuntime(16399): at android.widget.Spinner$DropDownAdapter.getDropDownView(Spinner.java:337) 
09-30 23:54:29.249: E/AndroidRuntime(16399): at android.widget.Spinner$DropDownAdapter.getView(Spinner.java:333) 
09-30 23:54:29.249: E/AndroidRuntime(16399): at android.widget.AbsListView.obtainView(AbsListView.java:1582) 
09-30 23:54:29.249: E/AndroidRuntime(16399): at android.widget.ListView.measureHeightOfChildren(ListView.java:1270) 
09-30 23:54:29.249: E/AndroidRuntime(16399): at android.widget.ListView.onMeasure(ListView.java:1181) 
09-30 23:54:29.249: E/AndroidRuntime(16399): at android.view.View.measure(View.java:8313) 
09-30 23:54:29.249: E/AndroidRuntime(16399): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138) 
09-30 23:54:29.249: E/AndroidRuntime(16399): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1017) 
09-30 23:54:29.249: E/AndroidRuntime(16399): at android.widget.LinearLayout.measureVertical(LinearLayout.java:386) 
09-30 23:54:29.249: E/AndroidRuntime(16399): at android.widget.LinearLayout.onMeasure(LinearLayout.java:309) 
09-30 23:54:29.249: E/AndroidRuntime(16399): at android.view.View.measure(View.java:8313) 
09-30 23:54:29.249: E/AndroidRuntime(16399): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138) 
09-30 23:54:29.249: E/AndroidRuntime(16399): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1017) 
09-30 23:54:29.249: E/AndroidRuntime(16399): at android.widget.LinearLayout.measureVertical(LinearLayout.java:386) 
09-30 23:54:29.249: E/AndroidRuntime(16399): at android.widget.LinearLayout.onMeasure(LinearLayout.java:309) 
09-30 23:54:29.249: E/AndroidRuntime(16399): at com.android.internal.widget.WeightedLinearLayout.onMeasure(WeightedLinearLayout.java:60) 
09-30 23:54:29.249: E/AndroidRuntime(16399): at android.view.View.measure(View.java:8313) 
09-30 23:54:29.249: E/AndroidRuntime(16399): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138) 
09-30 23:54:29.249: E/AndroidRuntime(16399): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 
09-30 23:54:29.249: E/AndroidRuntime(16399): at android.view.View.measure(View.java:8313) 
09-30 23:54:29.249: E/AndroidRuntime(16399): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138) 
09-30 23:54:29.249: E/AndroidRuntime(16399): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 
09-30 23:54:29.249: E/AndroidRuntime(16399): at android.view.View.measure(View.java:8313) 
09-30 23:54:29.249: E/AndroidRuntime(16399): at android.view.ViewRoot.performTraversals(ViewRoot.java:845) 
09-30 23:54:29.249: E/AndroidRuntime(16399): at android.view.ViewRoot.handleMessage(ViewRoot.java:1866) 
09-30 23:54:29.249: E/AndroidRuntime(16399): at android.os.Handler.dispatchMessage(Handler.java:99) 
09-30 23:54:29.249: E/AndroidRuntime(16399): at android.os.Looper.loop(Looper.java:130) 
09-30 23:54:29.249: E/AndroidRuntime(16399): at android.app.ActivityThread.main(ActivityThread.java:3687) 
09-30 23:54:29.249: E/AndroidRuntime(16399): at java.lang.reflect.Method.invokeNative(Native Method) 
09-30 23:54:29.249: E/AndroidRuntime(16399): at java.lang.reflect.Method.invoke(Method.java:507) 
09-30 23:54:29.249: E/AndroidRuntime(16399): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867) 
09-30 23:54:29.249: E/AndroidRuntime(16399): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625) 
09-30 23:54:29.249: E/AndroidRuntime(16399): at dalvik.system.NativeStart.main(Native Method)

來源

2013-09-30 Mohamad Ghafourian

你得到的線353空指針重新檢查你的代碼:)，也許那就是缺少 –

@Warlock TextView的 - 再試一次......這不是他的代碼它的指向。 – dymmeh

@dymmeh呃正確它在ArrayAdapter.java –

也許沒有定義的下拉列表視圖資源造成你的煩惱，試試這個：

// create adapter 
MyArrayAdapter<String> adapter = new MyArrayAdapter(getActivity(), 
    android.R.layout.simple_spinner_item, R.id.textView1, priArray); 

// set dropdown view and bind the adapter 
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
spinner.setAdapter(adapter);

來源

2013-09-30 20:52:49 CSmith

我以前使用微調，我從來沒有像這樣的問題。我會嘗試你的答案並讓你知道。 –

我得到了同樣的問題，我通過添加下面的代碼與適配器類相同，我們爲getView函數解決它，我們正在膨脹一個視圖，在這裏微調下拉列表。

@Override 
public View getDropDownView(int position, View convertView, ViewGroup parent) { 

    View view = convertView; 
    ViewHolder viewHolder; 
    if (view == null || !(view.getTag() instanceof ViewHolder)) { 
     view = LayoutInflater.from(parent.getContext()).inflate(R.layout.row_single_line_spinner, null); 
     viewHolder = new ViewHolder(view); 
     view.setTag(viewHolder); 
    } else { 
     viewHolder = (ViewHolder) view.getTag(); 
    } 
    SubTest subTest = getItem(position); 
    if (subTest != null) { 
     viewHolder.line1.setText(subTest.getTestname().trim()); 
    } 
    return view; 
}

來源

2017-01-30 09:27:22

單擊微調框時獲得空指針

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