挑战练习12.3 更多对话框

1 <TimePicker xmlns:android="http://schemas.android.com/apk/res/android"
2     android:id="@+id/dialog_time_picker"
3     android:layout_width="wrap_content"
4     android:layout_height="wrap_content"
5     android:calendarViewShown="false"
6     android:timePickerMode="spinner">
7 </TimePicker>

1 <Button
2         android:id="@+id/crime_time"
3         android:layout_width="match_parent"
4         android:layout_height="wrap_content" />

 1 package com.bignerdranch.android.criminalintent.fragment;
 2 
 3 import android.app.Activity;
 4 import android.app.Dialog;
 5 import android.content.DialogInterface;
 6 import android.content.Intent;
 7 import android.os.Build;
 8 import android.os.Bundle;
 9 import android.support.v4.app.DialogFragment;
10 import android.support.v7.app.AlertDialog;
11 import android.view.LayoutInflater;
12 import android.view.View;
13 import android.widget.TimePicker;
14 
15 
16 import com.bignerdranch.android.criminalintent.R;
17 
18 import java.util.Calendar;
19 import java.util.Date;
20 import java.util.GregorianCalendar;
21 
22 public class TimePickerFragment extends DialogFragment {
23     //两个按钮共用一个EXTRA_DATE，所以不用新添加一个TimePicker专用的EXTRA_TIME
24     public static final String EXTRA_DATE = "com.bignerdranch.android.criminalintent.date";
25 
26     private static final String ARG_DATE = "date";
27 
28     private TimePicker mTimePicker;
29 
30     @Override
31     public Dialog onCreateDialog(Bundle savedInstanceState) {
32         Date date = (Date) getArguments().getSerializable(ARG_DATE);
33         final Calendar calendar = Calendar.getInstance();
34         calendar.setTime(date);
35         //一定得加final修饰年月日,不然GregorianCalendar的构造方法会报错
36         final int year = calendar.get(Calendar.YEAR);
37         final int month = calendar.get(Calendar.MONTH);
38         final int day = calendar.get(Calendar.DAY_OF_MONTH);
39         //时分
40         int hour = calendar.get(Calendar.HOUR_OF_DAY);
41         int minute = calendar.get(Calendar.MINUTE);
42 
43         View v = LayoutInflater.from(getActivity()).inflate(R.layout.dialog_time, null);
44 
45         mTimePicker = (TimePicker) v.findViewById(R.id.dialog_time_picker);
46         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
47             mTimePicker.setHour(hour);
48             mTimePicker.setMinute(minute);
49         } else {
50             mTimePicker.setCurrentHour(hour);
51             mTimePicker.setCurrentMinute(minute);
52         }
53 
54         return new AlertDialog.Builder(getActivity())
55                 .setView(v)
56                 .setTitle(R.string.date_picker_title)
57                 .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
58                     @Override
59                     public void onClick(DialogInterface dialog, int which) {
60                         int hour, minute;
61                         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
62                             hour = mTimePicker.getHour();
63                             minute = mTimePicker.getMinute();
64                         } else {
65                             hour = mTimePicker.getCurrentHour();
66                             minute = mTimePicker.getCurrentMinute();
67                         }
68                         Date date = new GregorianCalendar(year, month, day, hour, minute).getTime();
69                         sendResult(Activity.RESULT_OK, date);
70                     }
71                 })
72                 .create();
73     }
74 
75     private void sendResult(int resultCode, Date date) {
76         if (getTargetFragment() == null) {
77             return;
78         }
79         Intent intent = new Intent();
80         intent.putExtra(EXTRA_DATE, date);
81         getTargetFragment().onActivityResult(getTargetRequestCode(), resultCode, intent);
82     }
83 
84     public static TimePickerFragment newInstance(Date date) {
85         Bundle args = new Bundle();
86         args.putSerializable(ARG_DATE, date);
87         TimePickerFragment fragment = new TimePickerFragment();
88         fragment.setArguments(args);
89         return fragment;
90     }
91 }

1 private Button mTimeButton;
2 private static final String DIALOG_TIME = "DialogTime";
3 private static final int REQUEST_TIME = 0;

1 private void updateTime() 
2 {
3         mTimeButton.setText(DateFormat.format("h:mm a", mCrime.getmDate()));
4 }

 1 mTimeButton = (Button)v.findViewById(R.id.crime_time);
 2         updateTime();
 3         mTimeButton.setOnClickListener(new View.OnClickListener() {
 4             @Override
 5             public void onClick(View v) {
 6                 FragmentManager manager = getFragmentManager();
 7                 TimePickerFragment dialog = TimePickerFragment.newInstance(mCrime.getmDate());
 8                 dialog.setTargetFragment(CrimeFragment.this, REQUEST_TIME);//设置目标Fragment，也就是前一个Fragment
 9                 dialog.show(manager,DIALOG_TIME);//第一个参数是FragmentManager，自动管理弹出的日历对话框，第二个是TAG
10             }
11         });

 1  @Override
 2     public void onActivityResult(int requestCode, int resultCode, Intent data) {
 3         if (resultCode != Activity.RESULT_OK) {
 4             return;
 5         }
 6         Date date = (Date) data.getSerializableExtra(DatePickerFragment.EXTRA_DATE);
 7         mCrime.setmDate(date);
 8         if (requestCode == REQUEST_DATE) {
 9             //因为TimePicker没有年月日，所以不用专门使用updateTime更新TimePicker
10             updateDate();
11         }
12         if (requestCode == REQUEST_TIME) {
13             updateTime();
14             updateDate();
15         }
16     }