Question

我正在尝试在对话框中显示一个NumberPicker，以便让用户选择0到10之间的值。这是我尝试使其工作的第二天。

这就是我所拥有的：

fragment_number_picker（布局）：

  <?xml version="1.0" encoding="utf-8"?>
  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
       android:id="@+id/numberPickerFragmentLinearLayout"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:gravity="center"
       android:orientation="horizontal" >

   <NumberPicker
       android:id="@+id/numberPickerInFragment"
       android:layout_width="wrap_content"
       android:layout_height="48dp"
       android:orientation="horizontal" />

  </LinearLayout>

DialogFragment定义：

public class NumberPickerCustomDialog extends DialogFragment {
Context context;
public NumberPickerCustomDialog() {}

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    context = getActivity().getApplicationContext();
    AlertDialog.Builder builder = new AlertDialog.Builder(context);
    LayoutInflater li = (LayoutInflater)     
        context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    // Inflate and set the layout for the dialog
    View view = li.inflate(R.layout.fragment_number_picker, null);

    builder
    // Set view:
       .setView(view)
    // Add action buttons
       .setPositiveButton(R.string.accept, new DialogInterface.OnClickListener(){
            @Override
            public void onClick(DialogInterface dialog, int id) {
                   // Accept number
            }
         })
       .setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener(){
            public void onClick(DialogInterface dialog, int id) {
                dialog.dismiss();
            }
        });   

   NumberPicker np = (NumberPicker) view.findViewById(R.id.numberPickerInFragment);
   np.setMaxValue(200);
   np.setMinValue(0);

   np.setFocusable(true);
   np.setFocusableInTouchMode(true);

   return builder.create();
   }
}

来自主要活动的电话：

public void openNumberPicker(){
     FragmentManager fm = getSupportFragmentManager();
     NumberPickerCustomDialog npc = new NumberPickerCustomDialog();
     npc.show(fm, "fragment_number_picker");
}

我收到一个InvocationTargetException，但我无法使其正常工作。

有什么想法吗？谢谢！

Answer 1

尝试更改您正在使用的上下文：

context = getActivity().getApplicationContext();

相反，您需要活动自己的上下文：

context = getActivity();

DialogFragment＆amp;中的InvocationTargetException NumberPicker

1 个答案: