我已经写了创建数据库的代码,我得到ERROR/AndroidRuntime(7193):在com.android.xont.db.DataBaseHelper.createDataBase(DataBaseHelper.java:43)Android数据库创建错误。
这是我的代码:
public class DataBaseHelper extends SQLiteOpenHelper {
private static String DB_PATH = "/data/data/com.android.xont.controller/databases/";
private static String DB_NAME = "DEMOUserVentura_HEMA.db";
private SQLiteDatabase DEMOUserVentura_HEMA;
private final Context myContext;
private DataBaseHelper myDbHelper;
public DataBaseHelper(Context context) {
super(context, DB_NAME, null, 1);
this.myContext = context;
}
/**
* Creates a empty database on the system and rewrites it with your own
* database.
**/
public void createDataBase() throws IOException {
boolean dbExist = checkDataBase();
if (dbExist) {
} else {
this.getReadableDatabase().close();
//this.getReadableDatabase().getPath();
//System.out.println(" ===== " + this.getReadableDatabase().getPath());
try {
copyDataBase();
} catch (IOException e) {
throw new Error(e);
}
}
}
private boolean checkDataBase() {
SQLiteDatabase checkDB = null;
try {
String myPath = DB_PATH + DB_NAME;
checkDB = SQLiteDatabase.openDatabase(myPath, null,SQLiteDatabase.OPEN_READONLY);
} catch (SQLiteException e) {
// database does't exist yet.
}
if (checkDB != null) {
checkDB.close();
}
return checkDB != null ? true : false;
}
private void copyDataBase() throws IOException {
// Open your local db as the input stream
InputStream myInput = myContext.getAssets().open(DB_NAME);
// Path to the just created empty db
String outFileName = DB_PATH + DB_NAME;
// Open the empty db as the output stream
OutputStream myOutput = new FileOutputStream(outFileName);
// transfer bytes from the inputfile to the outputfile
byte[] buffer = new byte[1024];
int length;
while ((length = myInput.read(buffer)) > 0) {
myOutput.write(buffer, 0, length);
}
// Close the streams
myOutput.flush();
myOutput.close();
myInput.close();
}
public void openDataBase() throws SQLException {
// Open the database
String myPath = DB_PATH + DB_NAME;
DEMOUserVentura_HEMA = SQLiteDatabase.openDatabase(myPath, null,
SQLiteDatabase.OPEN_READONLY);
}
@Override
public synchronized void close() {
if (DEMOUserVentura_HEMA != null)
DEMOUserVentura_HEMA.close();
super.close();
}
@Override
public void onCreate(SQLiteDatabase db) {
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}
当我打电话给这个活动时,我得到一个异常。我的数据库大小是:4.55MB。
当我打印getReadableDatabase()。getPath(),这是正确返回数据库路径。
请帮我一把。我一直在拉我的头发一个星期。
当我运行模拟器时,它会复制少量的文件。并非全部。然后我做了手动方式复制。
现在的问题是HTC手机。如何解决这个例外。请帮帮我。
在此先感谢..
感谢您的链接。那是什么createNewFile()方法?你有完整的源代码吗? – Piraba
查看关于示例代码的编辑 – thaussma
如果我们使用android 2.3.3,那么我们不需要做大块? – Piraba