仿照DatePickerFragment实现的TimePickerFragment

public class TimePickerFragment extends DialogFragment {    public static  final String EXTRA_HOUR="com.example.purplefragment.extra_hour";    public static final String EXTRA_MINUTE="com.example.purplefragment.extra_minute";    private static final String CURRENT_TIME_HOUR="com.example.purplefragment.current_time_hour";    private static final String CURRENT_TIME_MINUTE="com.example.purplefragment.current_time_minute";    private TimePicker mTimePicker;    public static TimePickerFragment newInstance(int hour,int minute)    {        Bundle bundle=new Bundle();        bundle.putInt(CURRENT_TIME_HOUR,hour);        bundle.putInt(CURRENT_TIME_MINUTE,minute);        TimePickerFragment dialog=new TimePickerFragment();        dialog.setArguments(bundle);        return dialog;    }    @Override    public Dialog onCreateDialog(Bundle savedInstanceState)    {        int hour=getArguments().getInt(CURRENT_TIME_HOUR);        int minute=getArguments().getInt(CURRENT_TIME_MINUTE);        View v= LayoutInflater.from(getActivity())                .inflate(R.layout.dialog_time,null);        mTimePicker=(TimePicker)v.findViewById(R.id.time_picker);        mTimePicker.setCurrentHour(hour);        mTimePicker.setCurrentMinute(minute);        return new AlertDialog.Builder(getActivity())                .setView(v)                .setTitle(R.string.time_picker_title)                .setPositiveButton(android.R.string.ok,                        new DialogInterface.OnClickListener() {                            @Override                            public void onClick(DialogInterface dialog, int which) {                                int hour=mTimePicker.getCurrentHour();                                int minute=mTimePicker.getCurrentMinute();                                sendResult(Activity.RESULT_OK,hour,minute);                            }                        })                .create();    }    private void sendResult(int resultCode,int hour,int minute)    {        if(getTargetFragment()==null)            return;        Intent intent=new Intent();        intent.putExtra(EXTRA_HOUR,hour);        intent.putExtra(EXTRA_MINUTE,minute);        getTargetFragment().onActivityResult(getTargetRequestCode(),resultCode,intent);    }}

<TimePicker xmlns:android="http://schemas.android.com/apk/res/android"            android:layout_width="match_parent"            android:layout_height="match_parent"            android:id="@+id/time_picker">TimePicker>

mTimeButton=(Button)v.findViewById(R.id.crime_time);        Calendar calendar=Calendar.getInstance();        calendar.setTime(mCrime.getDate());        //一开始没有加final时        //使用newInstance方法传参数时会提示        // hour be accessed from within inner class,shoule be declare final        final int hour=calendar.get(Calendar.HOUR_OF_DAY);        final int minute=calendar.get(Calendar.MINUTE);        mTimeButton.setText(hour+":"+minute);        mTimeButton.setOnClickListener(new View.OnClickListener(){            @Override            public void onClick(View v)            {                mIsChange=true;                FragmentManager fragmentManager=getFragmentManager();                TimePickerFragment dialog=TimePickerFragment.newInstance(hour,minute);                dialog.setTargetFragment(CrimeFragment.this,REQUEST_TIME);                dialog.show(fragmentManager,DIALOG_TIME);                setIsChangeResult();            }        });

//为什么之前个体extra默认值设为0的时候，我只点了修改日期的按钮        //时间会被重置为0呢，讲道理没有执行这个方法啊        if(requestCode==REQUEST_TIME){            int hour=intent.getIntExtra(TimePickerFragment.EXTRA_HOUR,mCrime.getDate().getHours());            int minute=intent.getIntExtra(TimePickerFragment.EXTRA_MINUTE,mCrime.getDate().getMinutes());            mTimeButton.setText(hour+":"+minute);            mCrime.getDate().setHours(hour);            mCrime.getDate().setMinutes(minute);            updateDate();        }

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