Android自定义可标记日历效果

package com.xugongming38.editcalendar.utils;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

/**
 * Created by dell on 2017/5/18.
 */

public class DatabaseHelper extends SQLiteOpenHelper {
 public static final String CREATE_DIARY = "create table Hair("
   + "id integer primary key autoincrement, "
   + "content text)";

 private Context mContext;

 public DatabaseHelper(Context context, String name, SQLiteDatabase.CursorFactory factory, int version){
  super(context, name, factory, version);
  mContext = context;
 }
 @Override
 public void onCreate(SQLiteDatabase db) {
  db.execSQL(CREATE_DIARY);
 }

 @Override
 public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

  db.execSQL("drop table if exists Hair");
  onCreate(db);
 }
}

package com.xugongming38.editcalendar.utils;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by dell on 2017/5/18.
 */

public class DataHelper {
 public static DatabaseHelper mHelper;
 public static void deleteData2List(String content) {
  SQLiteDatabase dbDelete = mHelper.getWritableDatabase();
  dbDelete.delete("Hair", "content = ?", new String[]{content});

 }
 public static void addData2List(String content) {
  SQLiteDatabase db = mHelper.getWritableDatabase();
  ContentValues values = new ContentValues();

  values.put("content", content);
  db.insert("Hair", null, values);
  values.clear();
 }
 public static List<String> getDataList(Context context) {

  if(mHelper==null){
   mHelper = new DatabaseHelper(context, "Hair.db", null, 1);
  }
  List<String> dataList = new ArrayList<>();

  SQLiteDatabase sqLiteDatabase = mHelper.getWritableDatabase();
  Cursor cursor = sqLiteDatabase.query("Hair", null, null, null, null, null, null);


  if (cursor.moveToFirst()) {
   do {
    String content = cursor.getString(cursor.getColumnIndex("content"));
    dataList.add(content);
   } while (cursor.moveToNext());
  }
  cursor.close();


  return dataList;
 }
}