Question

嗨，在我的应用程序中，它显示错误。我的应用程序在所有模拟器中运行，除了一个运行意味着它显示日志猫错误，任何人都可以告诉我如何解决我的问题。

DatabaseHandlers类

public class DatabaseHandlers extends SQLiteOpenHelper {

    // All Static variables
    // Database Version
    private static final int DATABASE_VERSION = 1;

    // Database Name
    private static final String DATABASE_NAME = "FristRegistrationManager";

    // GSfeedbacks table name
    private static final String TABLE_CONTACTS = "firstregistration";

    // GSfeedbacks Table Columns names
    private static final String KEY_ID = "id";
    private static final String KEY_NAME = "name";
    private static final String KEY_EMAIL = "email";
    private static final String KEY_PH_NO = "number";


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

    // Creating Tables
    @Override
    public void onCreate(SQLiteDatabase db) {
        String CREATE_CONTACTS_TABLE = "CREATE TABLE " + TABLE_CONTACTS + "("
                + KEY_ID + " INTEGER PRIMARY KEY," + KEY_NAME + " TEXT," + KEY_EMAIL + " TEXT,"
                + KEY_PH_NO + " TEXT" + ")";
        db.execSQL(CREATE_CONTACTS_TABLE);
    }

    // Upgrading database
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // Drop older table if existed
        db.execSQL("DROP TABLE IF EXISTS " + TABLE_CONTACTS);

        // Create tables again
        onCreate(db);
    }

    /**
     * All CRUD(Create, Read, Update, Delete) Operations
     */

    // Adding new contact
    void addGSfeedback(GSfeedback contact) {
        SQLiteDatabase db = this.getWritableDatabase();

        ContentValues values = new ContentValues();
        values.put(KEY_NAME, contact.getName()); // GSfeedback Name
        values.put(KEY_EMAIL, contact.getEmail()); // GSfeedback Name
        values.put(KEY_PH_NO, contact.getPhoneNumber()); // GSfeedback Phone    

        // Inserting Row
        db.insert(TABLE_CONTACTS, null, values);
        db.close(); // Closing database connection
    }

    // Getting single contact
    GSfeedback getGSfeedback(int id) {
        SQLiteDatabase db = this.getReadableDatabase();

        Cursor cursor = db.query(TABLE_CONTACTS, new String[] { KEY_ID,
                KEY_NAME,KEY_EMAIL, KEY_PH_NO }, KEY_ID + "=?",
                new String[] { String.valueOf(id) }, null, null, null, null);
        if (cursor != null)
            cursor.moveToFirst();

        GSfeedback contact = new GSfeedback(Integer.parseInt(cursor.getString(0)), cursor.getString(1), cursor.getString(2),cursor.getString(3));
        // return contact
        return contact;
    }

    // Getting All GSfeedbacks
    public ArrayList<GSfeedback> getAllGSfeedbacks() {
        ArrayList<GSfeedback> contactList = new ArrayList<GSfeedback>();
        // Select All Query
        String selectQuery = "SELECT  * FROM " + TABLE_CONTACTS;

        SQLiteDatabase db = this.getWritableDatabase();
        Cursor cursor = db.rawQuery(selectQuery, null);

        // looping through all rows and adding to list
        if (cursor.moveToFirst()) {
            do {
                GSfeedback contact = new GSfeedback();
                contact.setID(Integer.parseInt(cursor.getString(0)));
                contact.setName(cursor.getString(1));
                contact.setEmail(cursor.getString(2));
                contact.setPhoneNumber(cursor.getString(3));    
                // Adding contact to list
                contactList.add(contact);
            } while (cursor.moveToNext());
        }

        // return contact list
        return contactList;
    }

    // Updating single contact
    public int updateGSfeedback(GSfeedback contact) {
        SQLiteDatabase db = this.getWritableDatabase();

        ContentValues values = new ContentValues();
        values.put(KEY_NAME, contact.getName());
        values.put(KEY_EMAIL, contact.getEmail());
        values.put(KEY_PH_NO, contact.getPhoneNumber());    

        // updating row
        return db.update(TABLE_CONTACTS, values, KEY_ID + " = ?",
                new String[] { String.valueOf(contact.getID()) });
    }

    // Deleting single contact
    public void deleteGSfeedback(GSfeedback contact) {
        SQLiteDatabase db = this.getWritableDatabase();
        //db.delete(TABLE_CONTACTS, KEY_ID + " = ?", new String[] { String.valueOf(contact.getID()) });
        db.delete(TABLE_CONTACTS, null, null);
        db.close();
    }


    // Getting contacts Count
    public int getGSfeedbacksCount() {
        String countQuery = "SELECT  * FROM " + TABLE_CONTACTS;
        SQLiteDatabase db = this.getReadableDatabase();
        Cursor cursor = db.rawQuery(countQuery, null);
        cursor.close();

        // return count
        return cursor.getCount();
    }


}

logcat的

06-24 19:01:00.203: E/Database(592): close() was never explicitly called on database '/data/data/com.agilerise.hotel/databases/FristRegistrationManager' 
06-24 19:01:00.203: E/Database(592): android.database.sqlite.DatabaseObjectNotClosedException: Application did not close the cursor or database object that was opened here
06-24 19:01:00.203: E/Database(592):    at android.database.sqlite.SQLiteDatabase.<init>(SQLiteDatabase.java:1847)
06-24 19:01:00.203: E/Database(592):    at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:820)
06-24 19:01:00.203: E/Database(592):    at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:854)
06-24 19:01:00.203: E/Database(592):    at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:847)
06-24 19:01:00.203: E/Database(592):    at android.app.ContextImpl.openOrCreateDatabase(ContextImpl.java:547)
06-24 19:01:00.203: E/Database(592):    at android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java:203)
06-24 19:01:00.203: E/Database(592):    at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:118)
06-24 19:01:00.203: E/Database(592):    at com.agilerise.hotel.DatabaseHandlers.getAllGSfeedbacks(DatabaseHandlers.java:92)
06-24 19:01:00.203: E/Database(592):    at com.agilerise.hotel.First.onCreate(First.java:22)
06-24 19:01:00.203: E/Database(592):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
06-24 19:01:00.203: E/Database(592):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
06-24 19:01:00.203: E/Database(592):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
06-24 19:01:00.203: E/Database(592):    at android.app.ActivityThread.access$1500(ActivityThread.java:117)
06-24 19:01:00.203: E/Database(592):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
06-24 19:01:00.203: E/Database(592):    at android.os.Handler.dispatchMessage(Handler.java:99)
06-24 19:01:00.203: E/Database(592):    at android.os.Looper.loop(Looper.java:130)
06-24 19:01:00.203: E/Database(592):    at android.app.ActivityThread.main(ActivityThread.java:3683)
06-24 19:01:00.203: E/Database(592):    at java.lang.reflect.Method.invokeNative(Native Method)
06-24 19:01:00.203: E/Database(592):    at java.lang.reflect.Method.invoke(Method.java:507)
06-24 19:01:00.203: E/Database(592):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
06-24 19:01:00.203: E/Database(592):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
06-24 19:01:00.203: E/Database(592):    at dalvik.system.NativeStart.main(Native Method)

Answer 1

尝试在完成或管理后关闭所有游标

接近： cursor.close()

托管游标 startManagingCursor(cursor)

认为这应该对你有帮助！

Answer 2

当你打开你的桌子和光标时，你必须要关闭它bcz避免任何潜在的内存泄漏，所以你不应该在不再使用时关闭它。请尝试以下代码： -

cursor.close();

应用程序没有在android中运行特定版本

2 个答案: