[英]Android Database creation error.
我已经编写了创建数据库代码;我得到了 ERROR/AndroidRuntime(7193): at com.android.xont.db.DataBaseHelper.createDataBase(DataBaseHelper.Z93F725A073423FE1C886Z:
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) {
}
}
当我调用这个活动时,我得到了一个例外。 我的数据库大小是:4.55MB。
当我打印正确返回数据库路径的 getReadableDatabase().getPath() 时。
请帮帮我。 一个星期以来,我一直在拔头发。
当我通过模拟器运行时,它会复制少量文件。 不是全部。 然后我做了手动复制。
现在的问题是HTC手机。 如何修复该异常。 请帮我。
提前致谢..
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.