Using the dialog - maltaisn/calcdialoglib GitHub Wiki

Here's an example activity that shows a calculator dialog on a button click.

public class MainActivity extends AppCompatActivity implements CalcDialog.CalcDialogCallback {

    @Nullable
    private BigDecimal value = null;

    @Override
    protected void onCreate(Bundle state) {
        super.onCreate(state);
        setContentView(R.layout.activity_main);

        final CalcDialog calcDialog = new CalcDialog();
        
        // Open dialog button
        Button btn = findViewById(R.id.btn);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                calcDialog.getSettings().setInitialValue(value);
                calcDialog.show(getSupportFragmentManager(), "calc_dialog");
            }
        });
    }

    @Override
    public void onValueEntered(int requestCode, @Nullable BigDecimal value) {
        // if (requestCode == CALC_REQUEST_CODE) {} <-- If there were many dialogs, this would be used

        // The calculator dialog returned a value
        this.value = value;
    }
}

To show the picker, you call these two methods:

• dialog.getSettings().setInitialValue(BigDecimal value): Set the initial value to show. You can set null to initialize the dialog with no value and 0 will be shown. You must call this method every time the dialog is shown because the initial value is reset when the dialog is dismissed.
• picker.show(FragmentManager fm, String tag): Shows the DialogFragment. To show the dialog in another fragment, use getChildFragmentManager().

The result is returned in the CalcDialogCallback in method onValueEntered(int requestCode, BigDecimal value).

Calculator settings

Many settings are available for the dialog through CalcDialog.getSettings(), see Calculator settings.

Screenshot