I used SQLite Database Browser to create a database for my android app. I retrieved the data from this database by using the code below:
public class DataBaseHelper extends SQLiteOpenHelper {
private static String DB_NAME = "tourdb.sqlite";
private SQLiteDatabase db;
private final Context context;
private String DB_PATH;
public DataBaseHelper(Context context) {
super(context, DB_NAME, null, 1);
this.context = context;
DB_PATH = "/data/data/" + context.getPackageName() + "/" + "databases/";
}
public void createDataBase() throws IOException {
boolean dbExist = checkDataBase();
if (dbExist) {
} else {
this.getReadableDatabase();
try {
copyDataBase();
} catch (IOException e) {
throw new Error("Error copying database");
}
}
}
private boolean checkDataBase() {
File dbFile = new File(DB_PATH + DB_NAME);
return dbFile.exists();
}
private void copyDataBase() throws IOException {
InputStream myInput = context.getAssets().open(DB_NAME);
String outFileName = DB_PATH + DB_NAME;
OutputStream myOutput = new FileOutputStream(outFileName);
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 Cursor getData() {
String myPath = DB_PATH + DB_NAME;
db = SQLiteDatabase.openDatabase(myPath, null,
SQLiteDatabase.OPEN_READONLY);
Cursor c = db.rawQuery("SELECT * FROM CITY", null);
// Note: Master is the one table in External db. Here we trying to access the records of table from external db.
return c;
}
@Override
public void onCreate(SQLiteDatabase arg0) {
// TODO Auto-generated method stub
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
}
}
public class event extends Activity {
DataBaseHelper dbhelper;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.event);
// if you use siplecursoradapter then you should have _id as one of column name and its values should be integer in your db.
// so "_id", "columnName1", "columnName2" are column names from your db.
String[] from = new String[] { "_id", "cityName", "cityLong", "cityLat" };
int[] to = new int[] { R.id.TextView1, R.id.TextView2, R.id.TextView3 };
dbhelper = new DataBaseHelper(this);
try {
dbhelper.createDataBase();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Cursor c = dbhelper.getData();
@SuppressWarnings("deprecation")
SimpleCursorAdapter adapter = new SimpleCursorAdapter(getApplicationContext(), R.layout.list, c, from, to);
ListView list = (ListView) findViewById(R.id.ListView1);
list.setAdapter(adapter);
}
}
After I run my code, the LogCat shown that: there is no table "CITY" and i had try to look the database in DDMS it does not shown all the table that i had create. it only shown the android_metadata. Why does this happen? Why my table does not appeared?
