Android Criminal实例--（5）对话框的使用及fragment的数据传递

淡淡的烟草味﹌ 2022-05-18 07:15 183阅读 0赞

**fragment的数据传递还不是很懂……先把对话框记录一下**

这里使用DialogFragment来封装AlertDialog，这样可以随时建立，不会销毁。

dialog 的xml文件：

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent">
        <DatePicker android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/date_picker" android:calendarViewShown="false" />
    
    </LinearLayout>

//显示的是老式日历
    android:datePickerMode="spinner"

DatePickerFragment代码：

不是很懂。。下去还要继续学习

public class DatePickerFragment extends DialogFragment { 
    
        public static final String ARG_DATE = "arg_date";
        private DatePicker mDatePicker;
        public static final String EXTRA_DATE="com.apple.DatePaickerFragment.date";
    
        @NonNull
        @Override
        public Dialog onCreateDialog(Bundle savedInstanceState) {
    
            Date date=(Date)getArguments().getSerializable(ARG_DATE);
            Calendar calendar=Calendar.getInstance();
            calendar.setTime(date);
            int year=calendar.get(Calendar.YEAR);
            int month=calendar.get(Calendar.MONTH);
            int day=calendar.get(Calendar.DAY_OF_MONTH);
    
            View mView=LayoutInflater.from(getActivity()).inflate(R.layout.dialog_date,null);
    
            mDatePicker=(DatePicker)mView.findViewById(R.id.date_picker);
            mDatePicker.init(year,month,day,null);
    
            return new AlertDialog.Builder(getActivity())
                    .setView(mView)
                    .setTitle(R.string.date_crime)
                    .setPositiveButton("ok", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            int year=mDatePicker.getYear();
                            int day=mDatePicker.getDayOfMonth();
                            int month=mDatePicker.getMonth();
                            Date date=new GregorianCalendar(year,month,day).getTime();
                            sendRequest(Activity.RESULT_OK,date);
                        }
                    })
                    .create();
        }
    
        public static DatePickerFragment newInstance(Date date){
            Bundle args=new Bundle();
            args.putSerializable(ARG_DATE,date);
    
            DatePickerFragment fragment=new DatePickerFragment();
            fragment.setArguments(args);
            return fragment;
        }
    
        private void sendRequest(int resultCode,Date date){
            if(getTargetFragment()==null){
                return;
            }
            Intent intent=new Intent();
            intent.putExtra(EXTRA_DATE,date);
            getTargetFragment().onActivityResult(getTargetRequestCode(),resultCode,intent);
        }
    }

修改后的button点击事件为：  
![这里写图片描述][70]  
![这里写图片描述][70 1]  
数据传递但是没看到效果。。。不知道哪里有问题

[70]: /images/20220518/315de6414f8e4ce7bcd317138b0a3173.png
[70 1]: /images/20220518/f84aafd0302d4d2db8a52e366103b3f2.png