Android Can'；不要从NumberPicker中选择数字

我对NumberPicker有问题。我已经创建了一个对话框，我想在其中放置一个NumberPicker。显示NumberPicker，但我无法更改其中的数字。我已经设置了MinValue和MaxValue，但我不知道问题出在哪里

SettingsDialogFragment.java 设置\u dialog.xml

截图

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试试这种方法，希望这能帮助你解决问题。

public class SettingsDialogFragment extends DialogFragment {

    public Dialog onCreateDialog(Bundle savedInstanceState) {
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());

        builder.setTitle(R.string.settings);
        View view = LayoutInflater.from(getActivity()).inflate(R.layout.settings_dialog, null);

        builder.setView(view);
        builder.setPositiveButton(R.string.save, new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                    }
                });
        builder.setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int id) {
            }
        });
         NumberPicker np = (NumberPicker) view.findViewById(R.id.weight_picker);
        np.setMaxValue(300);
        np.setMinValue(0);
        np.setWrapSelectorWheel(true);
        np.setOnValueChangedListener(( new NumberPicker.
                OnValueChangeListener() {
            public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
                Log.i("value is",""+newVal);
            }
        }));
        return builder.create();
    }
}

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试试这个链接：它很有效。你能简单地解释一下为什么我的代码不起作用吗？@6franek，我当然认为你的代码不起作用，因为你在setView（）上已经膨胀了两次布局另一个在find number picker中，所以两个都对xml进行了两次不同的引用，您给了第一次布局膨胀引用setView，它显示在dialog中，第二次布局膨胀引用实现了setOnValueChangedListener，它间接引用了另一个not dialog视图，所以您无法获取数字对话框视图中的选择器onValueChange。

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

        />

</LinearLayout>

public class SettingsDialogFragment extends DialogFragment {

    public Dialog onCreateDialog(Bundle savedInstanceState) {
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());

        builder.setTitle(R.string.settings);
        View view = LayoutInflater.from(getActivity()).inflate(R.layout.settings_dialog, null);

        builder.setView(view);
        builder.setPositiveButton(R.string.save, new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                    }
                });
        builder.setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int id) {
            }
        });
         NumberPicker np = (NumberPicker) view.findViewById(R.id.weight_picker);
        np.setMaxValue(300);
        np.setMinValue(0);
        np.setWrapSelectorWheel(true);
        np.setOnValueChangedListener(( new NumberPicker.
                OnValueChangeListener() {
            public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
                Log.i("value is",""+newVal);
            }
        }));
        return builder.create();
    }
}