Question

我目前正在使用AlertDialog在我的应用程序中创建一个简单的对话框。我使用的代码如下所示：

AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setCancelable(false);
builder.setTitle(DialogTitle);
builder.setItems(R.array.options, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
    switch (which) {
        case 0:
            reset();
        break;
        case 1:
        exit();
        break;
        default:
        break;
       }
    }
});
builder.show();

我已经读过，最好的选择可能是创建一个扩展DialogFragment的类，然后使用我的DialogFragment代替当前的实现。

任何人都可以确认这是最佳解决方案，建议更好的方法，并可能给我一个例子吗？

谢谢。

Answer 1

public class ListDialogFragment extends DialogFragment 
    {
    // Use this instance of the interface to deliver action events
    private listDialogListener mListener;
    private String  title;
    private int items;

    /**
     * Create a new instance of EndGameDialogFragment, String dialogTitle
     * and ing dialogListItems as an argument.
     */
    static ListDialogFragment newInstance(String dialogTitle, int dialogListItems) 
    {
        ListDialogFragment frag = new ListDialogFragment();

        // Supply num input as an argument.
        Bundle args = new Bundle();
        args.putString("title", dialogTitle);
        args.putInt("items", dialogListItems);
        frag.setArguments(args);

        return frag;
    }


    /* The activity that creates an instance of this dialog fragment must
     * implement this interface in order to receive event callbacks.
     * Each method passes the DialogFragment in case the host needs to query it. */
    public interface listDialogListener 
    {
        public void onDialogClick(DialogFragment dialog, int which);
    }

    // Override the Fragment.onAttach() method to instantiate the NoticeDialogListener
    @Override
    public void onAttach(Activity activity) 
    {
        super.onAttach(activity);
        // Verify that the host activity implements the callback interface
        try 
        {
            // Instantiate the NoticeDialogListener so we can send events to the host
            mListener = (listDialogListener) activity;
        } 
        catch (ClassCastException e) 
        {
            // The activity doesn't implement the interface, throw exception
            throw new ClassCastException(activity.toString()
                    + " must implement NoticeDialogListener");
        }
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) 
    {
        title = getArguments().getString("title"); //retrive the titleString
        items = getArguments().getInt("items"); //retrive array of items for the list (from strings.xml)

        //build the dialog
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        builder.setTitle(title);
        builder.setItems(items, new DialogInterface.OnClickListener() 
        {
            public void onClick(DialogInterface dialog, int which) 
            {
                switch(which)
                {
                    case 0:
                        mListener.onDialogClick(ListDialogFragment.this, which);
                        break;
                    case 1:
                        mListener.onDialogClick(ListDialogFragment.this, which);
                        break;
                    default:
                        break;
                }
            }
        });
        return builder.create();
    }

}

Answer 2

您可以覆盖活动的onConfigurationChanged(Configuration newConfig)方法以识别方向更改，并恢复AlertDialog（如果已打开）。为此，您需要在清单android:configChanges="orientation的活动定义中使用以下标记。可以找到一个很好的介绍here。

旋转屏幕时重建AlertDialog的最佳方法是什么？

2 个答案: