How To Make The Number Stay In The Latest Number Instead Of Going Back To The Default?

my TxnNo(A0010001) came from Unitcode(A001) + LastTxnNo(0001). This is my button click. Db_Save.setOnClickListener(new View.OnClickListener() { @Override p

Solution 1:

Firstly, declare these two variables

SharedPreferences sharedPreferences;
SharedPreferences.Editor editor;
int count;

Next add these in onCreate method

sharedPreferences = getApplicationContext().getSharedPreferences("counters", MODE_PRIVATE);
editor = sharedPreferences.edit();
count = sharedPreferences.getInt("counter", 0);

Finally modify populate_TxnNo methods

  private void populate_TxnNo() {

        int a = count++;
        int lastNumber = Integer.valueOf(txn.getLastTxnNo());
        lastNumber = lastNumber + a;
        String stringLast = String.format("%04d", lastNumber);
        String txnNo = txn.getUnit_Code() + stringLast;
        D_Txn.setText(txnNo);
        editor.putInt("counter", ++a);
        editor.commit();
    }

Solution 2:

Try using Shared Preference

these two lines before onCreate()

 SharedPreferences prefs;
    SharedPreferences.Editor edit;  

these two lines in onCreate()

prefs=this.getSharedPreferences("yourPrefsKey",Context.MODE_PRIVATE);
            edit=prefs.edit();  

and on onPause() save the string

 @Override
protected void onPause() {
    super.onPause();
    edit.putString("yourKey", txnNo);
    edit.commit();
}

and to access it back simply write in onStart

@Override
    protected void onStart() {
        super.onStart();
        String txnNo = prefs.getString("yourKey", null);
    }

Solution 3:

simply add yourNumber to shared preferences

int yourNumber;

SharedPreferences number = getSharedPreferences("number", MODE_PRIVATE);

to save your number

number.edit.putInt("number",yourNumber).apply;

and read the number next time

int savedNumber = number.getInt("number",0);