從多個表填充列表視圖SQLite數據庫

我有一個SQLite數據庫與多個表，我想讀取其中一個表的所有內容，並用它來填充列表，但我不知道爲什麼應用程序崩潰時我嘗試從表中讀取所有數據。從多個表填充列表視圖SQLite數據庫

這裏是我的代碼：活動：

import android.app.Activity; 
import android.app.AlertDialog; 
import android.app.Dialog; 
import android.app.ListActivity; 
import android.content.DialogInterface; 
import android.content.Intent; 
import android.database.Cursor; 
import android.os.Bundle; 
import android.provider.ContactsContract; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.AdapterView; 
import android.widget.AdapterView.OnItemClickListener; 
import android.widget.AdapterView.OnItemLongClickListener; 
import android.widget.Button; 
import android.widget.ListAdapter; 
import android.widget.ListView; 
import android.widget.SimpleCursorAdapter; 


public class Manage_Groups extends ListActivity implements OnClickListener{ 

    Button create_group_button; 

    DB_Handler db; 
    Groups_DB_Adapter groups_db; 

    ListView groupsList; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.manage_groups); 

     // Initializing the buttons according to their ID 
     create_group_button = (Button)findViewById(R.id.create_group_button); 

     //Defines listeners for the buttons 
     create_group_button.setOnClickListener(this); 

     groups_db = new Groups_DB_Adapter(this); 

     // Opens the Main DB for read 
     db = new DB_Handler(this); 
     db.openToRead(); 

     // Opens the Groups DB for read 
     groups_db.openToRead(); 

     // This is where it crashes... 
     Cursor mCursor = groups_db.getAllGroups(); 
     startManagingCursor(mCursor); 
     String[] from = new String[]{Groups_DB_Adapter.GROUP_NAME}; 
     int[] to = {}; 
     SimpleCursorAdapter cursorAdapter = new SimpleCursorAdapter(this, android.R.layout.simple_list_item_1, 
            mCursor, from, to = new int[] { android.R.id.text1 }); 

     setListAdapter(cursorAdapter); 
     groupsList = getListView(); 

     // Listens for a long click, and then pops up a delete dialog 
     groupsList.setOnItemLongClickListener(new OnItemLongClickListener() { 

      public boolean onItemLongClick(AdapterView<?> arg0, View arg1, 
        int pos, long id) { 
       AlertDialog.Builder delete_group_alert = new AlertDialog.Builder(Manage_Groups.this); 
       delete_group_alert.setMessage("Are you sure you want to delete this group?"); 
       final int positionToRemove = pos; 

       // No - closes the dialog and does nothing 
       delete_group_alert.setNegativeButton("No", null); 

       // Yes - Deletes the clicked group from the DB 
       delete_group_alert.setPositiveButton("Yes", new AlertDialog.OnClickListener() { 
        public void onClick(DialogInterface dialog, int which) { 
         groups_db.deleteGroup(positionToRemove); 
        }}); 
       delete_group_alert.show(); 

       return true; 
      } 
     }); 
    } 

    //@Override 
    public void onClick(View src) { 
     Intent i; 
     switch (src.getId()) 
     { 
     case R.id.create_group_button: 

      finish(); 

      i = new Intent(this, Create_Group.class); 
      startActivity(i); 
      break; 
    } 

} 
}

組適配器：

import android.content.ContentValues; 
import android.content.Context; 
import android.database.Cursor; 
import android.database.SQLException; 
import android.database.sqlite.SQLiteDatabase; 
import android.database.sqlite.SQLiteOpenHelper; 
import android.util.Log; 

public class Groups_DB_Adapter { 

    // A reference to the database used by this application/object 
    private SQLiteDatabase db; 
    private OpenHelper db_open_helper; 

    // Groups table 
    static final String GROUPS_TABLE_NAME = "groups_table"; 
    static final String GROUP_ID = "group_id"; 
    static final String GROUP_NAME = "group_name"; 

    // The Activity or Application that is creating an object from this class 
    private final Context context; 

    private static class OpenHelper extends SQLiteOpenHelper { 

     OpenHelper(Context context) { 
      super(context, DB_Handler.DATABASE_NAME, null, DB_Handler.DATABASE_VERSION); 
     } 

     @Override 
     public void onCreate(SQLiteDatabase db) { 
     } 

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

    public Groups_DB_Adapter(Context ctx) { 
     this.context = ctx; 
    } 

    // Opens the DB for write 
    public Groups_DB_Adapter openToWrite() throws SQLException { 
     this.db_open_helper = new OpenHelper(this.context); 
     this.db = this.db_open_helper.getWritableDatabase(); 
     return this; 
    } 

    // Opens the DB for read 
    public Groups_DB_Adapter openToRead() throws SQLException { 
     this.db_open_helper = new OpenHelper(this.context); 
     this.db = this.db_open_helper.getReadableDatabase(); 
     return this; 
    } 

    // Closes the DB 
    public void close() { 
     this.db_open_helper.close(); 
    } 

    // Adds a new group 
    public void addNewGroup(String groupName) 
    { 
     // this is a key value pair holder used by android's SQLite functions 
     ContentValues values = new ContentValues(); 
     values.put(GROUP_NAME, groupName); 

     // ask the database object to insert the new data 
     try{db.insert(GROUPS_TABLE_NAME, null, values);} 
     catch(Exception e) 
     { 
      Log.e("DB ERROR", e.toString()); 
      e.printStackTrace(); 
     } 
    } 

    // Deletes a specific group 
    public boolean deleteGroup(long rowId) { 

     return this.db.delete(GROUPS_TABLE_NAME, GROUP_ID + "=" + rowId, null) > 0; 
    } 

    // Returns a Cursor with all the groups 
    public Cursor getAllGroups() { 

     return this.db.query(GROUPS_TABLE_NAME, new String[] { GROUP_ID, 
       GROUP_NAME }, null, null, null, null, null); 
    } 

    // Returns a specific group 
    public Cursor getGroup(long rowId) throws SQLException { 

     Cursor mCursor = 

     this.db.query(true, GROUPS_TABLE_NAME, new String[] { GROUP_ID, GROUP_NAME}, 
       GROUP_ID + "=" + rowId, null, null, null, null, null); 
     if (mCursor != null) { 
      mCursor.moveToFirst(); 
     } 
     return mCursor; 
    } 

    // Updates a group 
    public boolean updateGroup(long rowId, String name){ 
     ContentValues args = new ContentValues(); 
     args.put(GROUP_NAME, name); 

     return this.db.update(GROUPS_TABLE_NAME, args, GROUP_ID + "=" + rowId, null) >0; 
    } 

}

主要DB處理程序：

import android.content.ContentValues; 
import android.content.Context; 
import android.database.Cursor; 
import android.database.sqlite.SQLiteDatabase; 
import android.database.sqlite.SQLiteDatabase.CursorFactory; 
import android.database.sqlite.SQLiteOpenHelper; 
import android.database.sqlite.SQLiteStatement; 
import android.util.Log; 

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

public class DB_Handler { 

    // The database's name and version 
    public static final String DATABASE_NAME = "my_db"; 
    public static final int DATABASE_VERSION = 2; 

    // A reference to the database used by this application/object 
    static SQLiteDatabase db; 
    private OpenHelper db_open_helper; 

    // The Activity or Application that is creating an object from this class 
    private static Context context; 

    // Contacts table 
    static final String CONTACTS_TABLE_NAME = "contacts_table"; 
    static final String CONTACT_PHONE_NUMBER = "contact_phone_number"; 
    static final String CONTACT_NAME = "contact_name"; 
    private static final String CONTACTS_TABLE_CREATE = "CREATE TABLE " + CONTACTS_TABLE_NAME + 
                 " (" + 
                 CONTACT_PHONE_NUMBER + " INTEGER, " + 
                 CONTACT_NAME + " TEXT);"; 

    // Groups table 
    static final String GROUPS_TABLE_NAME = "groups_table"; 
    static final String GROUP_ID = "group_id"; 
    static final String GROUP_NAME = "group_name"; 
    private static final String GROUPS_TABLE_CREATE = "CREATE TABLE " + GROUPS_TABLE_NAME + 
                 " (" + 
                 GROUP_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + 
                 GROUP_NAME + " TEXT);"; 

    // Contacts <-> Groups Relations table 
    static final String CONTACT2GROUP_TABLE_NAME = "contact2group_table"; 
    private static final String CONTACT2GROUP_TABLE_CREATE = "CREATE TABLE " + CONTACT2GROUP_TABLE_NAME + 
                  " (" + 
                  CONTACT_PHONE_NUMBER + " INTEGER, " + 
                  GROUP_ID + " INTEGER);"; 

    // Constructor to simplify Business logic access to the repository 
    public DB_Handler(Context context) { 
     DB_Handler.context = context; 
    } 

    public DB_Handler openToRead() throws android.database.SQLException { 
     db_open_helper = new OpenHelper(context, DATABASE_NAME, null, DATABASE_VERSION); 
     db = db_open_helper.getReadableDatabase(); 
     return this;  
    } 

    public DB_Handler openToWrite() throws android.database.SQLException { 
     db_open_helper = new OpenHelper(context, DATABASE_NAME, null, DATABASE_VERSION); 
     db = db_open_helper.getWritableDatabase(); 
     return this;  
    } 

    public void close(){ 
     db_open_helper.close(); 
    } 


    public class OpenHelper extends SQLiteOpenHelper { 

     public OpenHelper(Context context, String name, 
       CursorFactory factory, int version) { 
      super(context, DATABASE_NAME, null, DATABASE_VERSION); 
     } 

     // Creates the DB 
     @Override 
     public void onCreate(SQLiteDatabase db) { 
      // Creating the Contacts table 
      db.execSQL(CONTACTS_TABLE_CREATE); 

      // Creating the Groups table 
      db.execSQL(GROUPS_TABLE_CREATE); 

      // Creating the Contact2Group table 
      db.execSQL(CONTACT2GROUP_TABLE_CREATE); 
     } 

     // Upgrades the DB if a newer version is available 
     @Override 
     public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
      db.execSQL("DROP TABLE IF EXISTS " + CONTACTS_TABLE_NAME); 
      db.execSQL("DROP TABLE IF EXISTS " + GROUPS_TABLE_NAME); 
      db.execSQL("DROP TABLE IF EXISTS " + CONTACT2GROUP_TABLE_NAME); 
      onCreate(db); 
     } 
    } 

}

編輯：添加的日誌 而這裏的日誌：

07-02 17:05:35.340: E/AndroidRuntime(1281): FATAL EXCEPTION: main 
07-02 17:05:35.340: E/AndroidRuntime(1281): java.lang.RuntimeException: Unable to start activity ComponentInfo{meetapp.pack/meetapp.pack.Manage_Groups}: android.database.sqlite.SQLiteException: no such table: groups_table: , while compiling: SELECT group_id, group_name FROM groups_table 
07-02 17:05:35.340: E/AndroidRuntime(1281):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956) 
07-02 17:05:35.340: E/AndroidRuntime(1281):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981) 
07-02 17:05:35.340: E/AndroidRuntime(1281):  at android.app.ActivityThread.access$600(ActivityThread.java:123) 
07-02 17:05:35.340: E/AndroidRuntime(1281):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147) 
07-02 17:05:35.340: E/AndroidRuntime(1281):  at android.os.Handler.dispatchMessage(Handler.java:99) 
07-02 17:05:35.340: E/AndroidRuntime(1281):  at android.os.Looper.loop(Looper.java:137) 
07-02 17:05:35.340: E/AndroidRuntime(1281):  at android.app.ActivityThread.main(ActivityThread.java:4424) 
07-02 17:05:35.340: E/AndroidRuntime(1281):  at java.lang.reflect.Method.invokeNative(Native Method) 
07-02 17:05:35.340: E/AndroidRuntime(1281):  at java.lang.reflect.Method.invoke(Method.java:511) 
07-02 17:05:35.340: E/AndroidRuntime(1281):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
07-02 17:05:35.340: E/AndroidRuntime(1281):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
07-02 17:05:35.340: E/AndroidRuntime(1281):  at dalvik.system.NativeStart.main(Native Method) 
07-02 17:05:35.340: E/AndroidRuntime(1281): Caused by: android.database.sqlite.SQLiteException: no such table: groups_table: , while compiling: SELECT group_id, group_name FROM groups_table 
07-02 17:05:35.340: E/AndroidRuntime(1281):  at android.database.sqlite.SQLiteCompiledSql.native_compile(Native Method) 
07-02 17:05:35.340: E/AndroidRuntime(1281):  at android.database.sqlite.SQLiteCompiledSql.<init>(SQLiteCompiledSql.java:68) 
07-02 17:05:35.340: E/AndroidRuntime(1281):  at android.database.sqlite.SQLiteProgram.compileSql(SQLiteProgram.java:143) 
07-02 17:05:35.340: E/AndroidRuntime(1281):  at android.database.sqlite.SQLiteProgram.compileAndbindAllArgs(SQLiteProgram.java:361) 
07-02 17:05:35.340: E/AndroidRuntime(1281):  at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:127) 
07-02 17:05:35.340: E/AndroidRuntime(1281):  at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:94) 
07-02 17:05:35.340: E/AndroidRuntime(1281):  at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:53) 
07-02 17:05:35.340: E/AndroidRuntime(1281):  at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:47) 
07-02 17:05:35.340: E/AndroidRuntime(1281):  at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1564) 
07-02 17:05:35.340: E/AndroidRuntime(1281):  at android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1449) 
07-02 17:05:35.340: E/AndroidRuntime(1281):  at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1405) 
07-02 17:05:35.340: E/AndroidRuntime(1281):  at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1485) 
07-02 17:05:35.340: E/AndroidRuntime(1281):  at meetapp.pack.Groups_DB_Adapter.getAllGroups(Groups_DB_Adapter.java:127) 
07-02 17:05:35.340: E/AndroidRuntime(1281):  at meetapp.pack.Manage_Groups.onCreate(Manage_Groups.java:53) 
07-02 17:05:35.340: E/AndroidRuntime(1281):  at android.app.Activity.performCreate(Activity.java:4465) 
07-02 17:05:35.340: E/AndroidRuntime(1281):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049) 
07-02 17:05:35.340: E/AndroidRuntime(1281):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920) 
07-02 17:05:35.340: E/AndroidRuntime(1281):  ... 11 more

任何想法？

謝謝！

來源

2012-07-02 user1476876

提供崩潰日誌將是一個很大的幫助。 – Hamid

這是否每次都發生，或者當您重新安裝應用程序並首次啓動它時？ – prashant

每當我開始在調試模式下工作時，發現它在我要求獲取所有組時崩潰（在代碼中註明它） – user1476876

Cursor mCursor = groups_db.getAllGroups();

這不起作用，因爲如您在錯誤中看到的，您並未創建groups_table。

@Override 
public void onCreate(SQLiteDatabase db) { 

}

你onCreate也onUpgrade方法是空的，你groups_table從未創建過。

所以你需要在這裏調用db.execSQL(GROUPS_TABLE_CREATE);在你的內部類Groups_DB_Adapter class。

來源

2012-07-02 17:18:57 Sajmon

表正在DB_Handler類中創建，即使添加create語句到Groups_DB_Adapter類，它不起作用並在完全相同的地方崩潰。 – user1476876

是的，但你可以從groups_db中調用光標... – Sajmon

從多個表填充列表視圖SQLite數據庫

回答

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