Using onSaveInstanceState during orientation change?

Asked Jul 07 '16 at 16:08

Active Jul 07 '16 at 16:08

Viewed 37 times

First thing; I'm pretty much brand new to all this.

I've built a basic calculator but I lose the data when switching orientation (such as typing the number 9 then it going blank when switched to landscape).

I've already looked and found this: How to use onSavedInstanceState example please , but I'm unsure how to implement it into my code.

public class MainActivity extends AppCompatActivity {
private TextView _screen;
private String display = "";
private String currentOperator = "";
private String result = "";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    _screen = (TextView)findViewById(R.id.textView);
    _screen.setText(display);



}

private void updateScreen(){
    _screen.setText(display);
}

Can anyone help? An example using my piece would be perfect. Thanks

edited May 23 '17 at 12:22

Community

asked Jul 07 '16 at 16:08

James Dennis

I think you are looking for onConfigurationChange() method ? – dex Jul 07 '16 at 16:17
I apologise but I'm not sure. – James Dennis Jul 07 '16 at 16:58
Well show the code for your onSaveInstanceState. Show what you tried. – greenapps Jul 07 '16 at 17:50
Typing the number 9? Where do you type in? – greenapps Jul 07 '16 at 17:52
`private TextView _screen;`. Dont call a TextView a screen. Better; private TextView textView; – greenapps Jul 07 '16 at 17:54
There's more code to it (calculator functions ect). I honestly believed that the above was it for onSaveInstanceState. I'm a complete beginner. – James Dennis Jul 07 '16 at 18:33
I think I've discovered my problem; I've been using a TextView rather than a TextField (editText) and I was unable to reconcile the string names in my head. – James Dennis Jul 07 '16 at 18:39

Using onSaveInstanceState during orientation change?

0 Answers0