android如何保存和顯示數據到兩個不同的活動在android

Question

我正在做一個大學列表的android項目和onClicking這個列表顯示學院的詳細信息。

這裏是快照：

• Schools list
• School detail

在工具欄上的學校詳細的右上端，我設置了一個小明星尋找icon.On點擊到該圖標的圖標被更改爲填充圖標，並將該學校的名稱以列表形式書寫班級。現在，我希望存儲詳細信息tooo.I的意思是在點擊該書籤列表項時，我想存儲&顯示與SchoolDetails類相同的細節。我在徘徊如何使用sqlite數據庫。請給我一些方向，我該怎麼做。

這是我的書籤類

public class Bookmark extends AppCompatActivity { 
    private List<Bookmarkitem> ourBookmarkListItems = new ArrayList<Bookmarkitem>(); 
    private ListView listView; 
    private BookmarkAdapter adapter; 
    DatabaseHelper dbhelper; 
    private Toolbar toolbar; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_bookmark); 
     dbhelper = new DatabaseHelper(this); 

     toolbar = (Toolbar) findViewById(R.id.toolbar); 
     setSupportActionBar(toolbar); 

     toolbar.setPadding(0, getStatusBarHeight(), 0, 0); 

     getSupportActionBar().setDisplayHomeAsUpEnabled(true); 
     getSupportActionBar().setTitle("Bookmark"); 

     List<Bookmarkitem> bookmarkedSchools = dbhelper.getAllSchoolBookmark(); 

     listView = (ListView) findViewById(R.id.list_bookmarked); 
     if (bookmarkedSchools.size() != 0) { 
      adapter = new BookmarkAdapter(this, bookmarkedSchools); 
      listView.setAdapter(adapter); 
     } else { 
      Toast.makeText(this, "You have no bookmark yet.", Toast.LENGTH_SHORT).show(); 
     } 

     listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
      @Override 
      public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 

       Intent i = new Intent(Bookmark.this, SchoolDetails.class); 

       startActivity(i); 

      } 
     }); 


    } 

，這是我的數據庫類，現在只是存儲的名稱，標識和學校的地址。

 package com.example.user.educationhunt.database; 

import android.accessibilityservice.GestureDescription; 
import android.content.ContentValues; 
import android.content.Context; 
import android.database.Cursor; 
import android.database.sqlite.SQLiteDatabase; 
import android.database.sqlite.SQLiteOpenHelper; 
import android.view.MenuItem; 

import com.example.user.educationhunt.listner.DatabaseUpdatedListener; 
import com.example.user.educationhunt.pojos.Bookmarkitem; 

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

/** 
* Created by user on 11/22/2016. 
*/ 
public class DatabaseHelper extends SQLiteOpenHelper { 

    public DatabaseUpdatedListener databaseUpdatedListener; 
    static final String DATABASE_NAME = "BookmarkDatabase"; 
    private static final int DATABASE_VERSION = 1; 
    private static final String TABLE_NAME_BOOKMARK = "bookmark"; 

    // Contact table columns name 
    private static final String ID = "Id"; 
    private static final String SID = "SId"; 
    private static final String NAME = "Name"; 
    private static final String LOGO = "Logo"; 
    private static final String LOCATION = "Location"; 

    String createTableBookmark = "Create table if not exists `Bookmark` (" 
      + "`name` TEXT," + "`location` TEXT," + "`logo` TEXT);"; 

    String CREATE_SCHOOL_BOOKMARK_TABLE = "CREATE TABLE " + TABLE_NAME_BOOKMARK + "(" 
      + ID + " INTEGER PRIMARY KEY, " 
      + SID + " INTEGER, " 
      + NAME + " TEXT, " 
      + LOGO + " TEXT, " 
      + LOCATION + " TEXT " + ")"; 

    public DatabaseHelper(Context context) { 
     super(context, DATABASE_NAME, null, DATABASE_VERSION); 
    } 

    public void insertBookmarkData(Bookmarkitem bookmarkitem) { 
     SQLiteDatabase db = getWritableDatabase(); 
     ContentValues content = new ContentValues(); 
     content.put("name", bookmarkitem.name); 
     content.put("location", bookmarkitem.address); 
     content.put("logo", bookmarkitem.logo); 

     db.insert("Bookmark", null, content); 
    } 

    public ArrayList<Bookmarkitem> getBookmarkist() { 
     String sql = "select * from Bookmark "; 
     ArrayList<Bookmarkitem> bookmarklist = new ArrayList<Bookmarkitem>(); 

     Cursor c = getWritableDatabase().rawQuery(sql, null); 
     while (c.moveToNext()) { 
      Bookmarkitem info = new Bookmarkitem(); 
      info.name = c.getString(c.getColumnIndex("name")); 
      info.address = c.getString(c.getColumnIndex("location")); 
      info.logo = c.getString(c.getColumnIndex("logo")); 
      bookmarklist.add(info); 
     } 
     c.close(); 
     return bookmarklist; 
    } 

    public Bookmarkitem getBookmarkData(String bookmarkName) { 
     String sql = "select * from Bookmark where id='" + bookmarkName + "'"; 

     Cursor c = getWritableDatabase().rawQuery(sql, null); 
     while (c.moveToNext()) { 
      Bookmarkitem info = new Bookmarkitem(); 
      info.name = c.getString(c.getColumnIndex("name")); 
      info.address = c.getString(c.getColumnIndex("location")); 
      info.logo = c.getString(c.getColumnIndex("logo")); 
     } 
     c.close(); 
     Bookmarkitem info = null; 
     return info; 
    } 

    @Override 
    public void onCreate(SQLiteDatabase sqLiteDatabase) { 
     // TODO Auto-generated method stub 
     sqLiteDatabase.execSQL(CREATE_SCHOOL_BOOKMARK_TABLE); 
    } 

    @Override 
    public void onUpgrade(SQLiteDatabase sqLiteDatabase, int arg1, int arg2) { 
     // TODO Auto-generated method stub 
     sqLiteDatabase.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME_BOOKMARK); 
     onCreate(sqLiteDatabase); 
    } 

    public void addSchoolBookmark(Bookmarkitem bookmarkitem, MenuItem menuItem) { 
     SQLiteDatabase db = this.getWritableDatabase(); 
     ContentValues values = new ContentValues(); 
     values.put(SID, bookmarkitem.getBookmarkID()); 
     values.put(NAME, bookmarkitem.getName()); 
     values.put(LOGO, bookmarkitem.getLogo()); 
     values.put(LOCATION, bookmarkitem.getAddress()); 

     //inserting row 
     if (db.insert(TABLE_NAME_BOOKMARK, null, values) != -1) { 
      databaseUpdatedListener.setDatabaseSuccess(bookmarkitem.getName(), menuItem); 
     } else { 
      databaseUpdatedListener.setDatabaseError("Failed to insert"); 
     } 
     db.close(); 
    } 

    public List<Bookmarkitem> getAllSchoolBookmark() { 
     SQLiteDatabase db = this.getWritableDatabase(); 
     String selectQuery = "SELECT * FROM " + TABLE_NAME_BOOKMARK; 
     List<Bookmarkitem> bookmarkitems = new ArrayList<>(); 
     Cursor cursor = db.rawQuery(selectQuery, null); 

     if (cursor.moveToFirst()) { 
      do { 
       Bookmarkitem bookmarkitem = new Bookmarkitem(); 
       bookmarkitem.setBookmarkID(Integer.parseInt(cursor.getString(0))); 
       bookmarkitem.setName(cursor.getString(1)); 
       bookmarkitem.setLogo(cursor.getString(2)); 
       bookmarkitem.setAddress(cursor.getString(3)); 
       bookmarkitems.add(bookmarkitem); 
      } while (cursor.moveToNext()); 
     } 
     return bookmarkitems; 
    } 

    public void removeBookmarkItem(int sID) { 
     SQLiteDatabase db = this.getWritableDatabase(); 
     db.execSQL("DELETE FROM " + TABLE_NAME_BOOKMARK + " WHERE " + SID+ "= '" + sID+ "'"); 
     db.close(); 


    } 
} 

這是我SchoolDetails類

package com.example.user.educationhunt; 

import android.os.Bundle; 
import android.support.design.widget.TabLayout; 
import android.support.v4.app.Fragment; 
import android.support.v4.app.FragmentManager; 
import android.support.v4.app.FragmentPagerAdapter; 
import android.support.v4.view.ViewPager; 
import android.support.v7.app.AppCompatActivity; 
import android.support.v7.widget.Toolbar; 
import android.view.Menu; 
import android.view.MenuInflater; 
import android.view.MenuItem; 
import android.widget.Toast; 

import com.example.user.educationhunt.database.DatabaseHelper; 
import com.example.user.educationhunt.fragment.About; 
import com.example.user.educationhunt.fragment.Admission; 
import com.example.user.educationhunt.fragment.FeeStructure; 
import com.example.user.educationhunt.listner.DatabaseUpdatedListener; 
import com.example.user.educationhunt.pojos.Bookmarkitem; 
import com.example.user.educationhunt.pojos.OurSchool; 

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

public class SchoolDetails extends AppCompatActivity implements DatabaseUpdatedListener { 

    private Toolbar toolbar; 
    private TabLayout tabLayout; 
    private ViewPager viewPager; 
    Boolean isStarFilled = false; 
    DatabaseHelper db; 
    OurSchool ourSchool; 
    private Menu menu; 


    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_school_details); 

     ourSchool = (OurSchool) getIntent().getSerializableExtra("school"); 

     toolbar = (Toolbar) findViewById(R.id.toolbar); 
     setSupportActionBar(toolbar); 

     getSupportActionBar().setDisplayHomeAsUpEnabled(true); 
     getSupportActionBar().setTitle(ourSchool.getSchoolName()); 


     db = new DatabaseHelper(this); 
     db.databaseUpdatedListener = this; 

     Toast.makeText(this, ourSchool.getSchoolName(), Toast.LENGTH_SHORT).show(); 

     viewPager = (ViewPager) findViewById(R.id.viewpager); 
     setupViewPager(viewPager); 

     tabLayout = (TabLayout) findViewById(R.id.tabs); 
     tabLayout.setupWithViewPager(viewPager); 

    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     MenuInflater inflater = getMenuInflater(); 
     inflater.inflate(R.menu.fav_school, menu); 
     this.menu = menu; 
     return true; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     switch (item.getItemId()) { 
      case R.id.star_School: 
       Bookmarkitem bookmarkitem = new Bookmarkitem(); 
       bookmarkitem.setBookmarkID(ourSchool.getSchoolId()); 
       bookmarkitem.setName(ourSchool.getSchoolName()); 
       bookmarkitem.setLogo(ourSchool.getSchoolLogo()); 
       bookmarkitem.setAddress(ourSchool.getSchoolAddress()); 
       db.addSchoolBookmark(bookmarkitem, item); 
       return true; 
     } 
     return super.onOptionsItemSelected(item); 
    } 

    @Override 
    public boolean onPrepareOptionsMenu(Menu menu) { 
     List<Bookmarkitem> bookmarkitems = db.getAllSchoolBookmark(); 
     if (bookmarkitems.size() != 0) { 
      for (Bookmarkitem bookmarkitem : bookmarkitems) { 
       if (bookmarkitem.getBookmarkID() == ourSchool.getSchoolId()) { 
        isStarFilled = true; 
        break; 
       } 
       else isStarFilled=false; 
      } 
      if (isStarFilled) { 
       menu.getItem(0).setIcon(getResources().getDrawable(R.mipmap.starfilled)); 
      }else if (isStarFilled.booleanValue()==true){ 
       delete(); 
       menu.getItem(0).setIcon(getResources().getDrawable(R.mipmap.star)); 
      } 
     } 
     return true; 
    } 

    public void delete(){ 
     List<Bookmarkitem> bookmarkitems = db.getAllSchoolBookmark(); 
     db.removeBookmarkItem(ourSchool.getSchoolId()); } 

    private void setupViewPager(ViewPager viewPager) { 
     ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager()); 
     adapter.addFragment(new About(), "ABOUT US"); 
     adapter.addFragment(new Admission(), "ADMISSION"); 
     adapter.addFragment(new FeeStructure(), "FEE"); 
     viewPager.setAdapter(adapter); 
    } 


    @Override 
    public void setDatabaseSuccess(String schoolName, MenuItem item) { 
     Toast.makeText(this, schoolName + "successfully added as bookmark", Toast.LENGTH_SHORT).show(); 
     item.setIcon(R.mipmap.starfilled); 
    } 

    @Override 
    public void setDatabaseError(String failureMessage) { 
     Toast.makeText(this, failureMessage, Toast.LENGTH_SHORT).show(); 
    } 

    class ViewPagerAdapter extends FragmentPagerAdapter { 
     private final List<Fragment> mFragmentList = new ArrayList<>(); 
     private final List<String> mFragmentTitleList = new ArrayList<>(); 

     public ViewPagerAdapter(FragmentManager manager) { 
      super(manager); 
     } 

     @Override 
     public Fragment getItem(int position) { 
      return mFragmentList.get(position); 
     } 

     @Override 
     public int getCount() { 
      return mFragmentList.size(); 
     } 

     public void addFragment(Fragment fragment, String title) { 
      mFragmentList.add(fragment); 
      mFragmentTitleList.add(title); 
     } 

     @Override 
     public CharSequence getPageTitle(int position) { 
      return mFragmentTitleList.get(position); 
     } 
    } 
} 

任何建議將heartly歡迎

Answer 1

private static final int ID = "Id"; 
private static final int SID = "SId"; 
private static final String NAME = "Name"; 
private static final String LOGO = "Logo"; 
private static final String LOCATION = "Location"; 

更改創建表的代碼：

String CREATE_SCHOOL_BOOKMARK_TABLE = "CREATE TABLE " + TABLE_NAME_BOOKMARK + "(" 
       + ID + " INTEGER PRIMARY KEY, " 
       + SID + " INTEGER, " 
       + NAME + " TEXT, " 
       + LOGO + " TEXT, " 
       + LOCATION + " TEXT " + ")"; 

也改變這一點：

public void addSchoolBookmark(Bookmarkitem bookmarkitem, MenuItem menuItem) { 
     SQLiteDatabase db = this.getWritableDatabase(); 
     ContentValues values = new ContentValues(); 
     values.put(SID, bookmarkitem.getBookmarkID()); 
     values.put(NAME, bookmarkitem.getName()); 
     values.put(LOGO, bookmarkitem.getLogo()); 
     values.put(LOCATION, bookmarkitem.getAddress()); 

     //inserting row 
     if (db.insert(TABLE_NAME_BOOKMARK, null, values) != -1) { 
      databaseUpdatedListener.setDatabaseSuccess(bookmarkitem.getName(), menuItem); 
     } else { 
      databaseUpdatedListener.setDatabaseError("Failed to insert"); 
     } 
     db.close(); 
    } 

在學校班級首先創建方法，從書籤表中刪除條目：

  db.removeBookmarkItem(ourSchool.getSchoolId(), item); 

現在，在數據庫類：實現上述方法刪除記錄：

public void removeBookmarkItem(int sID) { 
    SQLiteDatabase db = this.getWritableDatabase(); 



    database.execSQL("DELETE FROM " + TABLE_NAME + " WHERE " + SID+ "= '" + sID+ "'"); 
db.close(); 


} 

使用相同的方法在這兩種情況下，您需要檢查項目是否已被添加書籤，然後發送該ID以移除方法並刪除您的數據。