Question

我是android的初学者并坚持使用，我认为这是一项简单的任务。

我有一个ExpandableListView和一个DialogFragment课程。当我单击List的childView内的TextView元素时，我想启动dialogFragment类

以下是getChildView

的ExpandableListView方法

public class TestList extends BaseExpandableListAdapter {

    private List<String> headers;
    private HashMap<String, HashMap<String, List<String> > > list_children;
    private Context context;

    private static final String DIALOG_SINGLE_CHOICE_LIST = "MainActivity.RepeatSettings";

.......

    @Override
        public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
            HashMap<String, List<String>> listHashMap = (HashMap<String, List<String>>) this.getChild(groupPosition,childPosition);
            if(convertView == null) {
                LayoutInflater layoutInflater = (LayoutInflater) this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                convertView = layoutInflater.inflate(R.layout.list_child, null);
            }

            TextView repeat_btn = (TextView) convertView.findViewById(R.id.repeat_btn);
            repeat_btn.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    RepeatSettings repeatSettings = new RepeatSettings();
                    repeatSettings.show(getSupportFragmentManager(), DIALOG_SINGLE_CHOICE_LIST );
                }
            });
            return convertView;
        }

.....

}

在上面的代码中我收到错误，

无法解决方法getSupportFragmentManager()

我知道我的TestList课程并没有扩展FragmentActivity课程，但我不能这样做，因为它已经扩展BaseExpandableListAdapter

我还尝试使用getActivity().getSupportFragmentManager()，但在此我也收到提醒，Activity课程不能使用getActivity()方法，这种方法很明显，因为它适用于Fragment。

以下是Dialog类的代码

public class RepeatSettings extends DialogFragment {

    String repeat_interval[] ;
    String selected_interval;

    @NonNull
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        // creating an alertDialog object
        final AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());

        //defining the repeat_interval string
       repeat_interval = getResources().getStringArray(R.array.repeat_interval);

        //setting the alert dialog title and the type of items contained in it.
        //First parameter is the list, second is the already checked item, third is the listner object
        builder.setTitle("Choose Repeat Interval").setSingleChoiceItems(repeat_interval, -1, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                switch (which) {
                    case 0:
                        selected_interval = (String) repeat_interval[which];
                        break;
                    case 1:
                        selected_interval = (String) repeat_interval[which];
                        break;
                    case 2:
                        selected_interval = (String) repeat_interval[which];
                }
            }
        }).setPositiveButton("Ok", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {

            }
        });
        return builder.create();
    }
}

如何解决上述问题。

感谢您的帮助

Answer 1

在Dialog片段类

中创建一个静态新实例方法

 public static RepeatSettings newInstance() {
RepeatSettings frag = new RepeatSettings();
 return frag;
}

然后在列表适配器中调用对话框片段，如下所示：由于您的MainActivity活动的上下文被传递给适配器。

RepeatSettings obj =  RepeatSettings.newInstance();

obj.show(((MainActivity)context).getSupportFragmentManager(), DIALOG_SINGLE_CHOICE_LIST);

打开ExpanandableListView

1 个答案: