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Я знаю, что подобные вопросы задавались много раз раньше; но после очистки часов в течение нескольких часов я не смог найти решение. Моя реализация SQLite отказывается работать правильно, и база данных не создается, хотя я вызываю getWritableDatabase. Я попытался удалить и переустановить приложение, чтобы удалить пустой db, который может быть там, но это не сработало. Ошибка в LogCat выглядит следующим образом:this.getWritableDatabase() не вызывает onCreate()
-25 09:19:48.924 6149-6149/com.nikhilp.thecashcontroller E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.nikhilp.thecashcontroller, PID: 6149
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.nikhilp.thecashcontroller/com.nikhilp.thecashcontroller.activity.MainActivity}: android.database.sqlite.SQLiteException: no such table: expenses (code 1): , while compiling: SELECT * FROM expenses
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2390)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5257)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: android.database.sqlite.SQLiteException: no such table: expenses (code 1): , while compiling: SELECT * FROM expenses
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:37)
at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:44)
at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1316)
at android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1255)
at com.nikhilp.thecashcontroller.MyDBHandler.getExpenses(MyDBHandler.java:109)
at com.nikhilp.thecashcontroller.activity.MainActivity.onCreate(MainActivity.java:104)
at android.app.Activity.performCreate(Activity.java:5990)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)...
ОСНОВНАЯ ДЕЯТЕЛЬНОСТЬ OnCreate (ОТНОСИТЕЛЬНО DATABASE)
public MyDBHandler myDBHandler;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
myDBHandler = new MyDBHandler(this);
ArrayList <Expense> temp = myDBHandler.getExpenses();
displayView(0);
}
DATABASE HANDLER
package com.nikhilp.thecashcontroller;
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;
import android.widget.Toast;
import java.util.ArrayList;
public class MyDBHandler extends SQLiteOpenHelper{
private Context context;
private static final int DATABASE_VERSION = 1;
private static final String DATABASE_NAME = "cashdatabase.db";
public static final String TABLE_EXPENSES = "expenses";
public static final String COLUMN_ID = "_id";
public static final String COLUMN_AMOUNT = "_amount";
public static final String COLUMN_NOTE = "_note";
public static final String COLUMN_DATE = "_date";
public static final String COLUMN_CATEGORY = "_category";
public SQLiteDatabase db1;
private static final String CREATE_TABLE = "CREATE TABLE IF NOT EXISTS "+ TABLE_EXPENSES+"(" +
COLUMN_ID+ " INTEGER PRIMARY KEY AUTOINCREMENT" +
COLUMN_AMOUNT+ " TEXT " +
COLUMN_NOTE+ " TEXT " +
COLUMN_CATEGORY+ " TEXT "+
COLUMN_DATE+" TEXT" + ");";
private static final String DROP_TABLE = "DROP TABLE IF EXISTS "+TABLE_EXPENSES;
public MyDBHandler(Context context) {
super(context, DATABASE_NAME, null, 1);
this.context = context;
}
@Override
public void onOpen(SQLiteDatabase database) {
if(!database.isOpen()) {
SQLiteDatabase.openDatabase(database.getPath(), null, SQLiteDatabase.NO_LOCALIZED_COLLATORS |
SQLiteDatabase.CREATE_IF_NECESSARY);
}
}
@Override
public void onCreate(SQLiteDatabase db) {
try {
db.execSQL(CREATE_TABLE);
Message.message(context, "onCreate() called");
} catch (SQLException e) {
Message.message(context,e.toString());
}
}
//upgrade existing table
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
try {
db.execSQL(DROP_TABLE);
Message.message(context, "onUpgrade() called");
onCreate(db);
} catch (SQLException e) {
Message.message(context, e.toString());
}
}
//Add a new row to db
public void addExpense (Expense expense){
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(COLUMN_AMOUNT, expense.getAmount());
values.put(COLUMN_NOTE, expense.label);
values.put(COLUMN_CATEGORY, expense.category);
values.put(COLUMN_DATE, expense.sDate);
db.insert(TABLE_EXPENSES, null, values);
db.close();
}
//Delete Expense
public void deleteExpense (String label, double amount){
SQLiteDatabase db = getWritableDatabase();
db.execSQL("DELETE FROM " + TABLE_EXPENSES + " WHERE " + COLUMN_AMOUNT + "=" + amount + " AND " + COLUMN_NOTE + "=" + label);
}
public ArrayList<Expense> getExpenses(){
SQLiteDatabase db = this.getWritableDatabase();
ArrayList<Expense> expenses = new ArrayList<>();
// 1. build the query
String query = "SELECT * FROM " + TABLE_EXPENSES;
// 2. get reference to writable DB
onCreate(db);
Cursor cursor = db.rawQuery(query, null);
// 3. go over each row, build book and add it to list
Expense expense = null;
if (cursor.moveToFirst()) {
do {
expense = new Expense();
expense.setAmount(Double.parseDouble(cursor.getString(0)));
expense.label = (cursor.getString(1));
expense.category = Integer.parseInt(cursor.getString(2));
expense.sDate = cursor.getString(3);
// Add book to books
expenses.add(expense);
} while (cursor.moveToNext());
}
Log.d("getExpenses()", expenses.toString());
// return books
return expenses;
}
}