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| public class DatabaseHelper extends SQLiteOpenHelper{
//The Android's default system path of your application database.
private String DB_PATH;
private static String DB_NAME = "npb.sqlite";
private static final Integer DB_VERSION = 2;
private static String TABLE_LISTELEC = "npb";
private SQLiteDatabase mydb;
private final Context myContext;
/**
* Constructor
* Takes and keeps a reference of the passed context in order to access to the application assets and resources.
* @param context
*/
public DatabaseHelper(Context context) {
super(context, DB_NAME, null, DB_VERSION);
this.myContext = context;
DB_PATH = "/data/data/com.importdatabase/databases/";
//mydb = getReadableDatabase();
createDataBase();
}
@Override
public void onCreate(SQLiteDatabase db) {
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
public void createDataBase() throws IOException{
boolean dbExist = checkDataBase();
if(dbExist){
//do nothing - database already exist
}else{
//By calling this method and empty database will be created into the default system path
//of your application so we are gonna be able to overwrite that database with our database.
this.getReadableDatabase();
try {
copyDataBase();
} catch (IOException e) {
e.printStackTrace();
}
}
openDatabase();
}
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.close();
myOutput.flush();
myInput.close();
}
public void openDatabase() throws SQLException {
//Open the database
Log.i("test","on va instancier mydb");
String myPath = DB_PATH + DB_NAME;
mydb = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
Log.i("test","mydb="+mydb);
}
private boolean checkDataBase(){
SQLiteDatabase checkDB = null;
try{
String myPath = DB_PATH + DB_NAME;
checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READWRITE);
}catch(SQLiteException e){
//database does't exist yet.
}
if(checkDB != null){
checkDB.close();
}
return checkDB != null ? true : false;
}
@Override
public synchronized void close() {
if(mydb != null)
mydb.close();
super.close();
}
public ArrayList<String> getPersonnes() {
ArrayList<String> output = new ArrayList<String>();
String[] colonnesARecup = new String[] { "nom", "prenom" };
Cursor cursorResults = mydb.query(TABLE_LISTELEC, colonnesARecup, null,
null, null, null, "nom asc, prenom asc", null);
while (cursorResults.moveToFirst())
{
output.add(cursorResults.getString(0) + " " + cursorResults.getString(1));
}
return output;
}
} |
[ListView] Adapater / NullPointerException
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