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

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {// 使用 LayoutInflater 引用布局文件创建用于显示 Dialog 的 ViewView v = LayoutInflater.from(getActivity()).inflate(R.layout.dialog_date, null);return new AlertDialog.Builder(getActivity()).setView(v) // 设置视图.setTitle(R.string.date_picker_title) //设置标题// 设置 OK 按钮，OnClickListener 暂时留空.setPositiveButton(android.R.string.ok, null)// 使用 Builder 的 create() 方法创建 Dialog 并返回
        .create();
}

// 在 Fragment 中为 DatePickerFragment 添加一个 Tag
private static final String DIALOG_DATE = "DialogDate";
……
// 在 Fragment 内部获取 FragmentManager
FragmentManager manager = getFragmentManager();
DatePickerFragment dialog = new DatePickerFragment();
// 显示对话框
dialog.show(manager, DIALOG_DATE);

// DatePickerFragment.javapublic static DatePickerFragment newInstance(Date date) {// 新建一个 Bundle 对象用于存放数据Bundle args = new Bundle();args.putSerializable(ARG_DATE, date);DatePickerFragment fragment = new DatePickerFragment();// 使用 fragment arguments 来传递参数
    fragment.setArguments(args);return fragment;
}

// DatePickerFragment.javapublic static final String EXTRA_DATE ="com.kniost.criminalintent.date";……
private void sendResult(int resultCode, Date date) {// 防止出错if (getTargetFragment() == null) {return; }Intent intent = new Intent();// 放置数据到 Intent 中
    intent.putExtra(EXTRA_DATE, date);// 获取目标 fragment，调用其 onActivityResult 方法，其中 RequestCode 是用 getTargetRequestCode 方法获取的，resultCode 是传入参数，intent 包含了数据
    getTargetFragment().onActivityResult(getTargetRequestCode(), resultCode, intent);
}// CrimeFragment.java

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {// 如果一切正常，调用 sendResult 的方法时传入的参数应该就是 Activity.RESULT_OK，所以不会直接 returnif (resultCode != Activity.RESULT_OK) {return;}// 如此判断方便有多个回传时使用if (requestCode == REQUEST_DATE) {Date date = (Date) data.getSerializableExtra(DatePickerFragment.EXTRA_DATE);mCrime.setDate(date); mDateButton.setText(mCrime.getDate().toString());}
}

<?xml version="1.0" encoding="utf-8"?><menu xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"><itemandroid:id="@+id/menu_item_new_crime"android:icon="@android:drawable/ic_menu_add"android:title="@string/new_crime"app:showAsAction="ifRoom|withText"/>
</menu>

@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {super.onCreateOptionsMenu(menu, inflater);inflater.inflate(R.menu.fragment_crime_list, menu);
}

package edu.niit.software.criminalintent.database;/*** Created by 666 on 2017/9/29.*/public class CrimeDbSchema {public static final class CrimeTable{public static final String NAME = "crimes";public static final class Cols{public static final String UUID = "uuid";public static final String TITLE = "title";public static final String DATE = "date";public static final String SOLVED = "solved";}}
}

package edu.niit.software.criminalintent.database;import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;import edu.niit.software.criminalintent.database.CrimeDbSchema.CrimeTable;/*** Created by 666 on 2017/9/29.*/public class CrimeBaseHelper extends SQLiteOpenHelper {private static final int VERSION = 1;private static final String DATABASE_NAME = "crimeBase.db";public CrimeBaseHelper(Context context){super(context , DATABASE_NAME , null , VERSION);}@Overridepublic void onCreate(SQLiteDatabase db){db.execSQL("create table " + CrimeTable.NAME + "(" + "_id integer primary key autoincrement ," +CrimeTable.Cols.UUID + "," +CrimeTable.Cols.TITLE + "," +CrimeTable.Cols.DATE + "," +CrimeTable.Cols.SOLVED + ")");}@Overridepublic void onUpgrade(SQLiteDatabase db , int oldVersion , int newVersion){}
}