Close() tidak pernah dipanggil secara eksplisit pada database bahkan setelah mengimplementasikan close()

Eclipse menunjukkan kepada saya kesalahan di atas meskipun saya telah menerapkan metode tersebut close().

Ini kodenya:

public void update_project(View view) {

    EditText cinone = (EditText) findViewById(R.id.pname);
    pname = cinone.getText().toString();

    String fDate = pday + ". " + pmonth + ". " + pyear;

    projectdatabase dbupdate = new projectdatabase(UpdateProject.this);

    dbupdate.open();
    dbupdate.updateProject(id, pname, fDate); 
    dbupdate.close();

}

Logcat:

12-31 22:05:51.114: E/SQLiteDatabase(4180): close() was never explicitly called on  
database '/data/data/com.kk.project/databases/project_db' 
12-31 22:05:51.114: E/SQLiteDatabase(4180):  
android.database.sqlite.DatabaseObjectNotClosedException: Application did not close the     
cursor or database object that was opened here
12-31 22:05:51.114: E/SQLiteDatabase(4180):     at  
android.database.sqlite.SQLiteDatabase.<init>(SQLiteDatabase.java:1943)
12-31 22:05:51.114: E/SQLiteDatabase(4180):     at 
android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:1007)
12-31 22:05:51.114: E/SQLiteDatabase(4180):     at   
android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:986)
12-31 22:05:51.114: E/SQLiteDatabase(4180):     at 
android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:1051)
12-31 22:05:51.114: E/SQLiteDatabase(4180):     at 
android.app.ContextImpl.openOrCreateDatabase(ContextImpl.java:770)
12-31 22:05:51.114: E/SQLiteDatabase(4180):     at  
android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java:221)
12-31 22:05:51.114: E/SQLiteDatabase(4180):     at 
android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:157)
12-31 22:05:51.114: E/SQLiteDatabase(4180):     at     
com.kk.project.projectdatabase.open(projectdatabase.java:66)
12-31 22:05:51.114: E/SQLiteDatabase(4180):     at  
com.kk.project.ProjectExplorer.getinfo(ProjectExplorer.java:30)
12-31 22:05:51.114: E/SQLiteDatabase(4180):     at    
com.kk.project.ProjectExplorer.onCreate(ProjectExplorer.java:25)
12-31 22:05:51.114: E/SQLiteDatabase(4180):     at  
android.app.Activity.performCreate(Activity.java:4465)
12-31 22:05:51.114: E/SQLiteDatabase(4180):     at  
android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
12-31 22:05:51.114: E/SQLiteDatabase(4180):     at 
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
12-31 22:05:51.114: E/SQLiteDatabase(4180):     at 
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
12-31 22:05:51.114: E/SQLiteDatabase(4180):     at  
android.app.ActivityThread.access$600(ActivityThread.java:123)
12-31 22:05:51.114: E/SQLiteDatabase(4180):     at 
android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
12-31 22:05:51.114: E/SQLiteDatabase(4180):     at  
android.os.Handler.dispatchMessage(Handler.java:99)
12-31 22:05:51.114: E/SQLiteDatabase(4180):     at 
android.os.Looper.loop(Looper.java:137)
12-31 22:05:51.114: E/SQLiteDatabase(4180):     at  
android.app.ActivityThread.main(ActivityThread.java:4424)
12-31 22:05:51.114: E/SQLiteDatabase(4180):     at   
java.lang.reflect.Method.invokeNative(Native Method)
12-31 22:05:51.114: E/SQLiteDatabase(4180):     at     
java.lang.reflect.Method.invoke(Method.java:511)
12-31 22:05:51.114: E/SQLiteDatabase(4180):     at 
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
12-31 22:05:51.114: E/SQLiteDatabase(4180):     at   
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
12-31 22:05:51.114: E/SQLiteDatabase(4180):     at 
dalvik.system.NativeStart.main(Native Method)
12-31 22:05:51.165: E/System(4180): Uncaught exception thrown by finalizer
12-31 22:05:51.174: D/dalvikvm(4180): GREF has increased to 201
12-31 22:05:51.204: I/dalvikvm(4180): threadid=3: reacting to signal 3
12-31 22:05:51.324: E/System(4180): java.lang.IllegalStateException: Don't have   
database lock!
12-31 22:05:51.324: E/System(4180):     at  
android.database.sqlite.SQLiteDatabase.verifyLockOwner(SQLiteDatabase.java:2090)
12-31 22:05:51.324: E/System(4180):     at  
android.database.sqlite.SQLiteDatabase$1.entryRemoved(SQLiteDatabase.java:2182)
12-31 22:05:51.324: E/System(4180):     at   
android.database.sqlite.SQLiteDatabase$1.entryRemoved(SQLiteDatabase.java:2178)
12-31 22:05:51.324: E/System(4180):     at  
android.util.LruCache.trimToSize(LruCache.java:197)
12-31 22:05:51.324: E/System(4180):     at   
android.util.LruCache.evictAll(LruCache.java:285)
12-31 22:05:51.324: E/System(4180):     at   
android.database.sqlite.SQLiteDatabase.deallocCachedSqlStatements  
(SQLiteDatabase.java:2143)
12-31 22:05:51.324: E/System(4180):     at  
android.database.sqlite.SQLiteDatabase.closeClosable(SQLiteDatabase.java:1126)
12-31 22:05:51.324: E/System(4180):     at  
android.database.sqlite.SQLiteDatabase.finalize(SQLiteDatabase.java:1914)
12-31 22:05:51.324: E/System(4180):     at   
java.lang.Daemons$FinalizerDaemon.doFinalize(Daemons.java:182)
12-31 22:05:51.324: E/System(4180):     at  
java.lang.Daemons$FinalizerDaemon.run(Daemons.java:168)
12-31 22:05:51.324: E/System(4180):     at java.lang.Thread.run(Thread.java:856)

Hal yang aneh adalah saya telah menggunakan kode serupa dengan sangat baik dan berfungsi dengan sempurna. Selain itu, metode lain dari kelas database yang sama berfungsi dengan baik.

Kode aktivitas yang memanggil updateProject:

public class UpdateProject extends Activity implements OnItemSelectedListener,  DatePickerDialog.OnDateSetListener {

int mPos;
String mSelection;

String pname;
String pdifficulty;

int pday;
int pmonth;
int pyear;

String id;


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

    id = getIntent().getExtras().getString("idforupdate");

    userdatabase viewname = new userdatabase(this);             //Get username
    viewname.open();
    String name = viewname.getusername();
    viewname.close();

    if(name.equals("")) {

        DialogFragment newFragment = new NouserexitFragment();
        newFragment.show(getFragmentManager(), "exit");

    }

    Spinner spinner = (Spinner) findViewById(R.id.difficultyspinner); ArrayAdapter<CharSequence> 
    adapter = ArrayAdapter.createFromResource(this,R.array.difficultyarray, android.R.layout.simple_spinner_item);
    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    spinner.setAdapter(adapter);
    spinner.setOnItemSelectedListener(this);

    pdifficulty = spinner.getSelectedItem().toString();
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.activity_update_project, menu);
    return true;
}

@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public void datepicker(View v) {                                                        //Date picker   
    DialogFragment newFragment = new DatePickerForUpdate();
    newFragment.show(getFragmentManager(), "datePickerforupdate");

}


    @Override
public void onDateSet(DatePicker view, int year, int month, int day) {
    // TODO Auto-generated method stub

    pday = day;
    pmonth = month +1;
    pyear = year;

    month = month + 1;
    Button activityButton = (Button)findViewById(R.id.datebutton);
    activityButton.setText (day + "." + month + "." + year);

}

@Override
public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
    // TODO Auto-generated method stub

    UpdateProject.this.mPos = pos;
    UpdateProject.this.mSelection = parent.getItemAtPosition(pos).toString();

}

@Override
public void onNothingSelected(AdapterView<?> arg0) {
    // TODO Auto-generated method stub

}

public void update_project(View view) {

EditText cinone = (EditText) findViewById(R.id.pname);
pname = cinone.getText().toString();

String fdate = pday + ". " + pmonth + ". " + pyear;

projectdatabase update = new projectdatabase(UpdateProject.this);
update.open();
update.updateProject(id, pname, fdate);
update.close();


}

}

Kode untuk kelas database:

public class projectdatabase {

public static final String KEY_ROWID = "_id";
public static final String PROJECT_NAME = "project_name";
public static final String PROJECT_ID = "project_id";
public static final String PROJECT_DIFFICULTY = "project_difficulty";
public static final String PROJECT_STATUS = "project_status";
public static final String PROJECT_START_DATE = "project_start_date";
public static final String PROJECT_FINISH_DATE = "project_finsish_date";

private static final String DATABASE_NAME = "project_db";
static final String DATABASE_TABLE = "project_details";
private static final int DATABASE_VERSION = 1;

private DbHelper ourHelper;
private final Context projectdbContext;
private SQLiteDatabase projectDatabase;

private static class DbHelper extends SQLiteOpenHelper {
    public DbHelper(Context context) {

        super(context, DATABASE_NAME, null, DATABASE_VERSION);

    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        // TODO Auto-generated method stub

        db.execSQL("CREATE TABLE "+ DATABASE_TABLE + " (" +
                KEY_ROWID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
                PROJECT_NAME + " TEXT NOT NULL, " +
                PROJECT_ID + " INTEGER, " +
                PROJECT_START_DATE + " TEXT, " +
                PROJECT_FINISH_DATE + " TEXT, " +
                PROJECT_DIFFICULTY + " TEXT, " +
                PROJECT_STATUS + " TEXT);"
               ); 

    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // TODO Auto-generated method stub

        db.execSQL("DROP TABLE IF EXIST " + DATABASE_NAME);
        onCreate(db);

    }
}

public projectdatabase (Context c) {                            
     projectdbContext = c;
}

public projectdatabase open() {                                                 //Open database
    ourHelper = new DbHelper(projectdbContext);
    projectDatabase = ourHelper.getWritableDatabase();
    return this;
}

public void close() {                                                           //Close database
    ourHelper.close();
}

public long createEntry(String name, String pid, String startdate, String finishdate, String difficulty, String Status) {           //Enter project data into database

    ContentValues cv = new ContentValues();
    cv.put(PROJECT_NAME, name);
    cv.put(PROJECT_ID, pid);
    cv.put(PROJECT_START_DATE, startdate);
    cv.put(PROJECT_FINISH_DATE, finishdate);
    cv.put(PROJECT_DIFFICULTY, difficulty);
    cv.put(PROJECT_STATUS, Status);

    return projectDatabase.insert(DATABASE_TABLE, null, cv);
}

public String getData() {                                                       //Retrieve all project data

    String[] columns = new String[] {KEY_ROWID, PROJECT_NAME, PROJECT_ID, PROJECT_START_DATE, PROJECT_FINISH_DATE, PROJECT_DIFFICULTY, PROJECT_STATUS};
    Cursor c = projectDatabase.query(DATABASE_TABLE, columns, null, null, null, null, null);
    String result = "";

    int iRow = c.getColumnIndex(KEY_ROWID);
    int iName = c.getColumnIndex(PROJECT_NAME);
    int iID = c.getColumnIndex(PROJECT_ID);
    int iStartDate = c.getColumnIndex(PROJECT_START_DATE);
    int iFinishDate = c.getColumnIndex(PROJECT_FINISH_DATE);
    int iDifficulty = c.getColumnIndex(PROJECT_DIFFICULTY);
    int iStatus = c.getColumnIndex(PROJECT_STATUS);

    for(c.moveToFirst(); !c.isAfterLast(); c.moveToNext()) {

        result = result + c.getString(iRow) + "|" + c.getString(iName) + "|" + c.getString(iID) + "|" + c.getString(iStartDate) + "|" + c.getString(iFinishDate) + "|" + c.getString(iDifficulty) + "|" + c.getString(iStatus) + "\n";

    }

    return result;
}

public Cursor getDataforDisplay () {                                            //Project data for list view

    String[] columns = new String[] {KEY_ROWID, PROJECT_NAME, PROJECT_FINISH_DATE, PROJECT_DIFFICULTY, PROJECT_STATUS};
    Cursor c = projectDatabase.query(DATABASE_TABLE, columns, null, null, null, null, null);

    c.moveToFirst();
    return c;

}

public String getProjectName(String id) {                   

    String[] columns = new String[] {PROJECT_NAME,KEY_ROWID};
    Cursor c = projectDatabase.query(DATABASE_TABLE, columns, KEY_ROWID + "=" + id, null, null, null, null);

    if(c != null) {

        int iName = c.getColumnIndex(PROJECT_NAME);

        c.moveToFirst();
        String name = c.getString(iName);
        return name;

    }

    return null;
}

String publik getProjectStatus(String id) {

    String[] columns = new String[] {PROJECT_STATUS,KEY_ROWID};
    Cursor c = projectDatabase.query(DATABASE_TABLE, columns, KEY_ROWID + "=" + id, null, null, null, null);

    if(c != null) {

        int iStatus = c.getColumnIndex(PROJECT_STATUS);

        c.moveToFirst();
        String status = c.getString(iStatus);
        return status;

    }

    return null;
}

String publik getProjectDifficulty(String id) {

String[] columns = new String[] {PROJECT_DIFFICULTY,KEY_ROWID};
Cursor c = projectDatabase.query(DATABASE_TABLE, columns, KEY_ROWID + "=" + id, null, null, null, null);

if(c != null) {

    int iDiff = c.getColumnIndex(PROJECT_DIFFICULTY);

    c.moveToFirst();
    String diff = c.getString(iDiff);
    return diff;

}

return null;

}

String publik getProjectstartdate(String id) {

String[] columns = new String[] {PROJECT_START_DATE,KEY_ROWID};
Cursor c = projectDatabase.query(DATABASE_TABLE, columns, KEY_ROWID + "=" + id, null, null, null, null);

if(c != null) {

    int iSdate = c.getColumnIndex(PROJECT_START_DATE);

    c.moveToFirst();
    String sdate = c.getString(iSdate);
    return sdate;

}

return null;

}

public String getProjectfinishdate(String id) {

String[] columns = new String[] {PROJECT_FINISH_DATE,KEY_ROWID};
Cursor c = projectDatabase.query(DATABASE_TABLE, columns, KEY_ROWID + "=" + id, null, null, null, null);

if(c != null) {

    int iFdate = c.getColumnIndex(PROJECT_FINISH_DATE);

    c.moveToFirst();
    String fdate = c.getString(iFdate);
    return fdate;

}

return null;

}

public void updateProject(String id, String PName, String FDate) {//metode untuk mengupdate database

ContentValues cvUpdate = new ContentValues();
cvUpdate.put(PROJECT_NAME, PName);
cvUpdate.put(PROJECT_FINISH_DATE, FDate);

projectDatabase.update(DATABASE_TABLE, cvUpdate, KEY_ROWID + "=" + id, null); 

}

}

EDIT: Jika saya mengganti metode updateProject() dengan metode lain dari kelas database, kesalahannya hilang dan aplikasi berjalan tanpa masalah.