我对sqlite有这个问题，我收到了这个警告：
Database already exists
即使在关闭应用程序后，logcat也会持续显示：
package com.compapps.booster.db;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteConstraintException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
import com.compapps.booster.model.AppInfo;
import com.compapps.booster.model.UsedAppInfo;
import com.compapps.booster.utill.Const;
public class ExternalDbOpenHelper extends SQLiteOpenHelper {
// Path to the device folder with databases
public static String DB_PATH;
// Database file name
public static String DB_NAME;
public SQLiteDatabase database;
public final Context context;
public SQLiteDatabase getDb() {
return database;
}
public ExternalDbOpenHelper(Context context, String databaseName,
int databaseVersion) {
super(context, databaseName, null, databaseVersion);
this.context = context;
// Write a full path to the databases of your application
String packageName = context.getPackageName();
DB_PATH = String.format("//data//data//%s//databases//", packageName);
DB_NAME = databaseName;
openDataBase();
}
// This piece of code will create a database if itï؟½s not yet created
public void createDataBase() {
boolean dbExist = checkDataBase();
if (!dbExist) {
this.getReadableDatabase();
try {
copyDataBase();
} catch (IOException e) {
Log.e(this.getClass().toString(), "Copying error");
throw new Error("Error copying database!");
}
} else {
Log.i(this.getClass().toString(), "Database already exists");
}
}
// Performing a database existence check
private boolean checkDataBase() {
SQLiteDatabase checkDb = null;
try {
String path = DB_PATH + DB_NAME;
checkDb = SQLiteDatabase.openDatabase(path, null,
SQLiteDatabase.OPEN_READONLY);
} catch (SQLException e) {
Log.e(this.getClass().toString(), "Error while checking db");
}
// Android doesnt like resource leaks, everything should
// be closed
if (checkDb != null) {
checkDb.close();
}
return checkDb != null;
}
// Method for copying the database
private void copyDataBase() throws IOException {
// Open a stream for reading from our ready-made database
// The stream source is located in the assets
InputStream externalDbStream = context.getAssets().open(DB_NAME);
// Path to the created empty database on your Android device
String outFileName = DB_PATH + DB_NAME;
// Now create a stream for writing the database byte by byte
OutputStream localDbStream = new FileOutputStream(outFileName);
// Copying the database
byte[] buffer = new byte[1024];
int bytesRead;
while ((bytesRead = externalDbStream.read(buffer)) > 0) {
localDbStream.write(buffer, 0, bytesRead);
}
// Dont forget to close the streams
localDbStream.close();
externalDbStream.close();
}
public SQLiteDatabase openDataBase() throws SQLException {
String path = DB_PATH + DB_NAME;
if (database == null) {
createDataBase();
}
database = SQLiteDatabase.openDatabase(path, null,
SQLiteDatabase.OPEN_READWRITE);
return database;
}
@Override
public void onCreate(SQLiteDatabase db) {
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
public void insertAutoKillApps(final ArrayList<AppInfo> listAutoKillApps) {
for (int i = 0; i < listAutoKillApps.size(); i++) {
if (listAutoKillApps.get(i).isChecked()) {
AppInfo info = listAutoKillApps.get(i);
ContentValues values = new ContentValues();
values.put(Const.TblAutoKillColumn.APP_NAME, info.getAppName());
values.put(Const.TblAutoKillColumn.PACKAGE_NAME,
info.getPkgName());
values.put(Const.TblAutoKillColumn.PROCESS_ID,
info.getProcessId());
int id = (int) database.insert(Const.TABLE_AUTO_KILL, null,
values);
}
}
}
public int insertAutoKillApp(AppInfo info) {
ContentValues values = new ContentValues();
values.put(Const.TblAutoKillColumn.APP_NAME, info.getAppName());
values.put(Const.TblAutoKillColumn.PACKAGE_NAME, info.getPkgName());
// values.put(Const.TblAutoKillColumn.PROCESS_ID, info.getProcessId());
int id = (int) database.insert(Const.TABLE_AUTO_KILL, null, values);
return id;
}
public int insertAllAutoKillApp(ArrayList<AppInfo> list) {
int count = 0;
for (int i = 0; i < list.size(); i++) {
AppInfo info = list.get(i);
ContentValues values = new ContentValues();
values.put(Const.TblAutoKillColumn.APP_NAME, info.getAppName());
values.put(Const.TblAutoKillColumn.PACKAGE_NAME, info.getPkgName());
// values.put(Const.TblAutoKillColumn.PROCESS_ID,
// info.getProcessId());
int id = (int) database.insert(Const.TABLE_AUTO_KILL, null, values);
if (id != -1) {
count += 1;
}
}
System.out.println("Total app kill inserted " + count);
return count;
}
public boolean deleteAutoKillApp(AppInfo info) {
int row = database.delete(Const.TABLE_AUTO_KILL,
Const.TblAutoKillColumn.PACKAGE_NAME + " = ?",
new String[] { info.getPkgName() });
if (row != 0) {
return true;
}
return false;
}
public int deleteAllAutoKillApp(ArrayList<AppInfo> list) {
int count = 0;
for (int i = 0; i < list.size(); i++) {
AppInfo info = list.get(i);
int row = database.delete(Const.TABLE_AUTO_KILL,
Const.TblAutoKillColumn.PACKAGE_NAME + " = ?",
new String[] { info.getPkgName() });
if (row != 0) {
count += 1;
}
}
System.out.println("Total app kill deleted " + count);
return count;
}
public ArrayList<AppInfo> getAutoKillApps() {
ArrayList<AppInfo> appList = new ArrayList<AppInfo>();
String selectQuery = "SELECT * FROM " + Const.TABLE_AUTO_KILL;
Cursor cursor = database.rawQuery(selectQuery, null);
try {
if (cursor != null && cursor.getCount() > 0) {
if (cursor.moveToFirst()) {
do {
AppInfo info = new AppInfo();
info.setAppName(cursor.getString(0));
info.setPkgName(cursor.getString(1));
// info.setProcessId(cursor.getInt(2));
appList.add(info);
} while (cursor.moveToNext());
}
}
return appList;
} catch (Exception e) {
Log.d("Error in getting app auto kill from DB", e.getMessage());
return appList;
}
finally{
cursor.close();
}
}
public int insertUsedAppInfo(UsedAppInfo uAppInfo, boolean isUpdate) {
int id = 0;
if (isUpdate) {
ContentValues values = new ContentValues();
values.put(Const.TblAppUsedColumn.OPEN_COUNTER,
uAppInfo.getCounter());
values.put(Const.TblAppUsedColumn.OPEN_TIME, uAppInfo.getTime());
String[] args = new String[] { uAppInfo.getPackage_name() };
id = (int) database.update(Const.TABLE_APP_USED_DETAIL, values,
Const.TblAppUsedColumn.PACKAGE_NAME + "=?", args);
} else {
ContentValues values = new ContentValues();
values.put(Const.TblAppUsedColumn.PACKAGE_NAME,
uAppInfo.getPackage_name());
values.put(Const.TblAppUsedColumn.OPEN_COUNTER,
uAppInfo.getCounter());
values.put(Const.TblAppUsedColumn.OPEN_TIME, uAppInfo.getTime());
id = (int) database.insert(Const.TABLE_APP_USED_DETAIL, null,
values);
}
return id;
}
public UsedAppInfo gettUsedAppInfo(String packageName) {
UsedAppInfo uAppInfo = null;
String selectQuery = "SELECT * FROM " + Const.TABLE_APP_USED_DETAIL
+ " WHERE " + Const.TblAppUsedColumn.PACKAGE_NAME + " = "
+ "\"" + packageName + "\"";
System.out.println("Query coding: " + selectQuery);
try {
Cursor cursor = database.rawQuery(selectQuery, null);
if (cursor != null && cursor.getCount() > 0) {
if (cursor.moveToFirst()) {
uAppInfo = new UsedAppInfo();
uAppInfo.setPackage_name(cursor.getString(0));
uAppInfo.setCounter(cursor.getInt(1));
uAppInfo.setTime(cursor.getString(2));
}
cursor.close();
}
return uAppInfo;
} catch (Exception e) {
Log.d("Error in getting app info from db", e.getMessage());
return null;
}
}
@Override
public synchronized void close() {
if (database != null) {
database.close();
}
super.close();
}
}
所以我认为即使应用程序关闭，程序也会执行，这是我班级的代码：
tkinter请帮助我，谢谢！