您好，我在从另一个类调用时打开/创建SQLiteDatabase时遇到问题。我现在是学生，对我来说这是一个新手，所以请残酷地清楚任何答案，以便我可以跟随。
Route.java下的Testing（）调用数据库类来设置数据库
DatabaseManager db = new DatabaseManager(Route.this, "dbSkyTrain.dbf", null, 1);
当DatabaseManager尝试运行这行代码时崩溃。
非常感谢您提供任何帮助。我很确定我只是把它设置错了。
Route.java：
public void Testing(){
//Station Variables
int StnID; //Unique ID, Format: ##
String StnLine; //Format: XXX = Mil, Exp, Eve, Can or YVR
int StnLineIndex; //Format: ##
int StnZone; //1, 2, 3
int StnTimePrev; //Time in min to this station from previous station
int StnTimeNext; //Time in min from this station to the next station
String StnSwitch; //Is this a switching station T or F
String StnName; //Name
//Path Variables
int PathStartIndex; //Start station index
int PathEndIndex; //Destination or Switching station index
String PathLine; //Line that the train is currently on
String PathSwitch; //Name of switching station or "False" if end index is destination
DatabaseManager db = new DatabaseManager(Route.this, "dbSkyTrain.dbf", null, 1);
Station station = new Station();
Path path = new Path();
//Get Station usage
station = db.getStation("Lougheed");
StnID = station.ID();
StnLine = station.Line();
StnLineIndex = station.LineIndex();
StnZone = station.Zone();
StnTimePrev = station.TimeNext();
StnTimeNext = station.TimePrev();
StnSwitch = station.Switch();
StnName = station.Name();
//alternative get station method
station = db.getStation("Mil", 10);
StnID = station.ID();
StnLine = station.Line();
StnLineIndex = station.LineIndex();
StnZone = station.Zone();
StnTimePrev = station.TimeNext();
StnTimeNext = station.TimePrev();
StnSwitch = station.Switch();
StnName = station.Name();
db.close();
//Path usage - returns endIndex of destination station or switching station
path = getPath("Lougheed", "YVR-Airport");
PathStartIndex = path.StartIndex();
PathEndIndex = path.EndIndex();
PathLine = path.Line();
PathSwitch = path.SwitchStn();
Toast.makeText(Route.this, PathLine + " " + PathStartIndex + " " + PathEndIndex + " " + PathSwitch , Toast.LENGTH_LONG).show();
}
//Get Route instructions//////////////////////////////////////////////////////////////////////////////////////
public Path getPath(String StartStation, String EndStation){
String strSQL;
String strLine, strLineStart, strLineEnd;
int intIndexStart, intIndexEnd;
String strSwitch;
//Table Station Variables
String tbl_Stations = "tblStations";
String key_StnID = "StnID";
String key_StnName = "StnName";
String key_StnLine = "StnLine";
String key_StnLineIndex = "StnLineIndex";
String key_StnZone = "StnZone";
String key_StnTimePrev = "StnTimePrev";
String key_StnTimeNext = "StnTimeNext";
String key_StnSwitch = "StnSwitch";
DatabaseManager dbManager = new DatabaseManager(Route.this, "dbSkyTrain.dbf", null, 1);
SQLiteDatabase db = dbManager.getWritableDatabase();
//First Station
strSQL = "SELECT * FROM " + tbl_Stations + " WHERE " + key_StnName + "=" + StartStation;
Cursor c = db.rawQuery(strSQL, null);
c.moveToFirst();
Station station = new Station(c.getString(0), c.getString(1), c.getString(2), c.getString(3), c.getString(4), c.getString(5), c.getString(6), c.getString(7));
strLineStart = station.Line();
intIndexStart = station.LineIndex();
//Second Station
strSQL = "SELECT * FROM " + tbl_Stations + " WHERE " + key_StnName + "=" + EndStation;
c = db.rawQuery(strSQL, null);
c.moveToFirst();
station = new Station(c.getString(0), c.getString(1), c.getString(2), c.getString(3), c.getString(4), c.getString(5), c.getString(6), c.getString(7));
strLineEnd = station.Line();
intIndexEnd = station.LineIndex();
db.close();
DatabaseManager.java
package com.example.skytrainfinalproject;
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.widget.Toast;
public class DatabaseManager extends SQLiteOpenHelper{
//Database variables
String db_Name = "dbSkyTrain.dbf";
//Table Station Variables
String tbl_Stations = "tblStations";
String key_StnID = "StnID";
String key_StnName = "StnName";
String key_StnLine = "StnLine";
String key_StnLineIndex = "StnLineIndex";
String key_StnZone = "StnZone";
String key_StnTimePrev = "StnTimePrev";
String key_StnTimeNext = "StnTimeNext";
String key_StnSwitch = "StnSwitch";
//Table Options Variables
String tbl_Options = "tblOptions";
String key_OptID = "OptID";
String key_OptName = "OptName";
String key_OptValue = "OptValue";
//Table GPS Variables
String tbl_Gps = "tblGps";
String key_GpsID = "GpsID";
String key_GpsName = "GpsName";
String key_Gpslongitude = "Gpslongitude";
String key_Gpslatitude = "Gpslatitude";
//Constructor//////////////////////////////////////////////////////////////////////////////////////
public DatabaseManager(Context context, String dbName, CursorFactory factory,
int version) {
super(context, dbName, factory, version);
}
@Override
public void onCreate(SQLiteDatabase db) {
//Drop tables -comment out tables to save
db.execSQL("DROP TABLE IF EXISTS " + tbl_Stations);
db.execSQL("DROP TABLE IF EXISTS " + tbl_Options);
//db.execSQL("DROP TABLE IF EXISTS " + tbl_Gps);
//Recreate tables
CreateTblStations();
CreateTblOptions();
//CreateTblGps();
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
//Create GPS Table//////////////////////////////////////////////////////////////////////////////////////
public void CreateTblGps(){
}
//Add GPS//////////////////////////////////////////////////////////////////////////////////////
public void addGps(){
}
//Get GPS//////////////////////////////////////////////////////////////////////////////////////
public void getGps(){
}
//Create Options Table//////////////////////////////////////////////////////////////////////////////////////
public void CreateTblOptions(){
SQLiteDatabase db = getWritableDatabase();
//Table Values
String Create_tblOptions = "CREATE TABLE IF NOT EXISTS " + tbl_Options + "(" +
key_OptID + " INTEGER PRIMARY KEY," +
key_OptName +" TEXT," +
key_OptValue + " TEXT)";
//Create Table
db.execSQL(Create_tblOptions);
addOption(db, "01", "TicketDefault", "Adult");
addOption(db, "02", "TicketA1", "2.75");
addOption(db, "03", "TicketA2", "4.00");
addOption(db, "04", "TicketA3", "5.50");
addOption(db, "05", "TicketC1", "1.75");
addOption(db, "06", "TicketC2", "2.75");
addOption(db, "07", "TicketC3", "3.75");
addOption(db, "08", "AfterHours", "6:30");
addOption(db, "09", "YVRCharge", "5.00");
db.close();
}
//Add Option//////////////////////////////////////////////////////////////////////////////////////
public void addOption(SQLiteDatabase db, String ID, String Name, String Value){
String insertRow;
insertRow = "INSERT INTO " + tbl_Options + " values ('" + Integer.parseInt(ID) + "', '" + Name + "', '" + Value + "');";
db.execSQL(insertRow);
}
//Get Option//////////////////////////////////////////////////////////////////////////////////////
public Option getOption(int ID){
String strSQL;
SQLiteDatabase db = getReadableDatabase();
strSQL = "SELECT * FROM tblOptions WHERE OptID=" + String.valueOf(ID);
Cursor c = db.rawQuery(strSQL, null);
c.moveToFirst();
Option option = new Option(c.getString(0), c.getString(1), c.getString(2));
c.close();
db.close();
return option;
}
//Create Station Table//////////////////////////////////////////////////////////////////////////////////////
public void CreateTblStations(){
SQLiteDatabase db = getWritableDatabase();
//Table Values
String Create_tblStations = "CREATE TABLE IF NOT EXISTS " + tbl_Stations + "(" +
key_StnID + " INTEGER PRIMARY KEY," +
key_StnLine +" TEXT," +
key_StnLineIndex + " INTEGER," +
key_StnZone + " INTEGER," +
key_StnTimePrev + " INTEGER," +
key_StnTimeNext + " INTEGER," +
key_StnSwitch + " TEXT," +
key_StnName + " TEXT)";
//Create Table
db.execSQL(Create_tblStations);
//Fill Table
//Format (StnID, LineIndex, Line, Zone, TimePrev, TimeNext, Switch, Name)
addStation(db, "01", "19", "Exp", "3", "2", "3", "F", "King George");
addStation(db, "02", "18", "Exp", "3", "3", "2", "F", "Surrey Central");
addStation(db, "03", "17", "Exp", "3", "2", "3", "F", "Gateway");
addStation(db, "04", "16", "Exp", "3", "3", "2", "F", "Scott Road");
addStation(db, "05", "28", "Mil", "1", "1", "0", "F", "VCC-Clark");
addStation(db, "06", "27", "Mil", "1", "3", "1", "T", "Commercial");
addStation(db, "07", "26", "Mil", "1", "1", "3", "F", "Renfrew");
addStation(db, "08", "25", "Mil", "1", "3", "1", "F", "Rupert");
addStation(db, "09", "24", "Mil", "2", "1", "3", "F", "Gilmore");
addStation(db, "10", "23", "Mil", "2", "2", "1", "F", "Brentwood");
addStation(db, "11", "22", "Mil", "2", "2", "2", "F", "Holdom");
addStation(db, "12", "21", "Mil", "2", "2", "2", "F", "Sperling/Burnaby Lake");
addStation(db, "13", "20", "Mil", "2", "3", "2", "F", "Lake City");
addStation(db, "14", "19", "Mil", "2", "2", "3", "F", "Production Way/University");
addStation(db, "15", "18", "Mil", "2", "3", "2", "T", "Lougheed");
addStation(db, "16", "17", "Mil", "2", "2", "3", "F", "Braid");
addStation(db, "17", "16", "Mil", "2", "3", "2", "F", "Sapperton");
addStation(db, "18", "15", "Mil-Exp", "2", "1", "3", "T", "Columbia");
addStation(db, "19", "14", "Mil-Exp", "2", "4", "1", "F", "New Westminster");
addStation(db, "20", "13", "Mil-Exp", "2", "2", "4", "F", "22nd St");
addStation(db, "21", "12", "Mil-Exp", "2", "3", "2", "F", "Edmonds");
addStation(db, "22", "11", "Mil-Exp", "2", "2", "3", "F", "Royal Oak");
addStation(db, "23", "10", "Mil-Exp", "2", "1", "2", "F", "Metrotown");
addStation(db, "24", "09", "Mil-Exp", "1", "2", "1", "F", "Patterson");
addStation(db, "25", "08", "Mil-Exp", "1", "2", "2", "F", "Joyce");
addStation(db, "26", "07", "Mil-Exp", "1", "1", "2", "F", "29th Ave");
addStation(db, "27", "06", "Mil-Exp", "1", "3", "1", "F", "Nanaimo");
addStation(db, "28", "05", "Mil-Exp", "1", "3", "3", "T", "Commercial");
addStation(db, "29", "04", "Mil-Exp", "1", "2", "3", "F", "Main");
addStation(db, "30", "03", "Mil-Exp", "1", "1", "2", "F", "Stadium");
addStation(db, "31", "02", "Mil-Exp", "1", "1", "1", "F", "Granville");
addStation(db, "32", "01", "Mil-Exp", "1", "2", "1", "F", "Burrard");
addStation(db, "33", "00", "Mil-Exp-Can-YVR", "1", "0", "2", "T", "Waterfront");
addStation(db, "34", "01", "Can-YVR", "1", "2", "2", "F", "Vancouver City Center");
addStation(db, "35", "02", "Can-YVR", "1", "2", "2", "F", "Yaletown-Roundhouse");
addStation(db, "36", "03", "Can-YVR", "1", "2", "1", "F", "Olympic Village");
addStation(db, "37", "04", "Can-YVR", "1", "1", "2", "F", "Broadway-City Hall");
addStation(db, "38", "05", "Can-YVR", "1", "2", "3", "F", "King Edward");
addStation(db, "39", "06", "Can-YVR", "1", "3", "2", "F", "Oakridge-41st");
addStation(db, "40", "07", "Can-YVR", "1", "2", "3", "F", "Langara-49th");
addStation(db, "41", "08", "Can-YVR", "1", "3", "2", "F", "Marine Drive");
addStation(db, "42", "09", "Can-YVR", "2", "2", "9", "T", "Bridgeport");
addStation(db, "43", "10", "Can", "2", "2", "2", "F", "Aberdeen");
addStation(db, "44", "11", "Can", "2", "2", "2", "F", "Lansdowne");
addStation(db, "45", "12", "Can", "2", "2", "0", "F", "Brighouse");
addStation(db, "46", "10", "YVR", "2", "9", "2", "F", "Templeton");
addStation(db, "47", "11", "YVR", "2", "2", "2", "F", "Sea Island Center");
addStation(db, "48", "12", "YVR", "2", "2", "0", "F", "YVR-Airport");
db.close();
}
//Add Station//////////////////////////////////////////////////////////////////////////////////////
public void addStation(SQLiteDatabase db, String ID, String LineIndex, String Line, String Zone, String TimePrev, String TimeNext, String Switch, String Name){
String insertRow;
insertRow = "INSERT INTO " + tbl_Stations + " values ('" + Integer.parseInt(ID) + "', '" + Integer.parseInt(LineIndex) + "', '" + Line + "', '" + Integer.parseInt(Zone) + "', '" + Integer.parseInt(TimePrev) + "', '" + Integer.parseInt(TimeNext) + "', '" + Switch + "', '" + Name + "');";
db.execSQL(insertRow);
}
//Get Station//////////////////////////////////////////////////////////////////////////////////////
public Station getStation(String strStnName){
String strSQL;
SQLiteDatabase db = getReadableDatabase();
strSQL = "SELECT * FROM " + tbl_Stations + " WHERE " + key_StnName + "=" + strStnName;
Cursor c = db.rawQuery(strSQL, null);
c.moveToFirst();
Station station = new Station(c.getString(0), c.getString(1), c.getString(2), c.getString(3), c.getString(4), c.getString(5), c.getString(6), c.getString(7));
c.close();
db.close();
return station;
}
public Station getStation(String strLine, int intLineIndex){
String strSQL;
SQLiteDatabase db = getReadableDatabase();
strSQL = "SELECT * FROM " + tbl_Stations + " WHERE " + key_StnLine + "=" + strLine + " AND " + key_StnLineIndex + "=" + String.valueOf(intLineIndex);
Cursor c = db.rawQuery(strSQL, null);
c.moveToFirst();
Station station = new Station(c.getString(0), c.getString(1), c.getString(2), c.getString(3), c.getString(4), c.getString(5), c.getString(6), c.getString(7));
c.close();
db.close();
return station;
}
}
错误记录
03-30 18:23:32.736: W/ApplicationPackageManager(27014): getCSCPackageItemText()
03-30 18:23:35.038: D/AndroidRuntime(27014): Shutting down VM
03-30 18:23:35.038: W/dalvikvm(27014): threadid=1: thread exiting with uncaught exception (group=0x4189cda0)
03-30 18:23:35.048: E/AndroidRuntime(27014): FATAL EXCEPTION: main
03-30 18:23:35.048: E/AndroidRuntime(27014): Process: com.example.skytrainfinalproject, PID: 27014
03-30 18:23:35.048: E/AndroidRuntime(27014): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.skytrainfinalproject/com.example.skytrainfinalproject.Route}: java.lang.IllegalStateException: getDatabase called recursively
03-30 18:23:35.048: E/AndroidRuntime(27014): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2305)
03-30 18:23:35.048: E/AndroidRuntime(27014): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2363)
03-30 18:23:35.048: E/AndroidRuntime(27014): at android.app.ActivityThread.access$900(ActivityThread.java:161)
03-30 18:23:35.048: E/AndroidRuntime(27014): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1265)
03-30 18:23:35.048: E/AndroidRuntime(27014): at android.os.Handler.dispatchMessage(Handler.java:102)
03-30 18:23:35.048: E/AndroidRuntime(27014): at android.os.Looper.loop(Looper.java:157)
03-30 18:23:35.048: E/AndroidRuntime(27014): at android.app.ActivityThread.main(ActivityThread.java:5356)
03-30 18:23:35.048: E/AndroidRuntime(27014): at java.lang.reflect.Method.invokeNative(Native Method)
03-30 18:23:35.048: E/AndroidRuntime(27014): at java.lang.reflect.Method.invoke(Method.java:515)
03-30 18:23:35.048: E/AndroidRuntime(27014): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1265)
03-30 18:23:35.048: E/AndroidRuntime(27014): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081)
03-30 18:23:35.048: E/AndroidRuntime(27014): at dalvik.system.NativeStart.main(Native Method)
03-30 18:23:35.048: E/AndroidRuntime(27014): Caused by: java.lang.IllegalStateException: getDatabase called recursively
03-30 18:23:35.048: E/AndroidRuntime(27014): at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:204)
03-30 18:23:35.048: E/AndroidRuntime(27014): at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:164)
03-30 18:23:35.048: E/AndroidRuntime(27014): at com.example.skytrainfinalproject.DatabaseManager.CreateTblStations(DatabaseManager.java:152)
03-30 18:23:35.048: E/AndroidRuntime(27014): at com.example.skytrainfinalproject.DatabaseManager.onCreate(DatabaseManager.java:61)
03-30 18:23:35.048: E/AndroidRuntime(27014): at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:252)
03-30 18:23:35.048: E/AndroidRuntime(27014): at android.database.sqlite.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:188)
03-30 18:23:35.048: E/AndroidRuntime(27014): at com.example.skytrainfinalproject.DatabaseManager.getStation(DatabaseManager.java:249)
03-30 18:23:35.048: E/AndroidRuntime(27014): at com.example.skytrainfinalproject.Route.Testing(Route.java:62)
03-30 18:23:35.048: E/AndroidRuntime(27014): at com.example.skytrainfinalproject.Route.onCreate(Route.java:28)
03-30 18:23:35.048: E/AndroidRuntime(27014): at android.app.Activity.performCreate(Activity.java:5426)
03-30 18:23:35.048: E/AndroidRuntime(27014): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
03-30 18:23:35.048: E/AndroidRuntime(27014): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2269)
03-30 18:23:35.048: E/AndroidRuntime(27014): ... 11 more
03-30 18:23:37.160: I/Process(27014): Sending signal. PID: 27014 SIG: 9
答案 0 :(得分：0)
如果您使用的是SQLiteOpenHelper，那么您很可能不想调用SQLiteDatabase.openOrCreateDatabase（...）。辅助类为SQLiteDatabase提供了一个抽象层。您的构造函数应如下所示：
public DatabaseManager(Context context, String dbName, CursorFactory factory,
int version) {
super(context, dbName, factory, version);
}
然后您可以像这样使用您的数据库：
DatabaseManager dbManager = new DatabaseManager(context, "dbSkyTrain.dbf", null, 1);
SQLiteDatabase db = dbManager.getWritableDatabase();
// Do database operations
db.close();
将根据需要调用onCreate方法。