Android: Returning values from a custom Dialog

Context:

Cases which involve using a custom dialog to capture user input, may require the captured data to be passed back to the displaying activity. The following describes exactly this… how to pass back data from a custom dialog to the displaying activity.

ps – by custom dialog we mean a custom class that ‘extends Dialog‘.

Solution:

Step 1 – Define custom interface

// step 1 - to return values from dialog public interface OnFooEventListener { public void fooEvent(int fieldOne, int fieldTwo); }

Step 2 – Declare the above interface as a field member

// step 2 - to return values from dialog private OnFooEventListener onFooEventListener;

Step 3 – Add it to the custom dialog constructor

// step 3 - to return values from dialog public FooEventDialog(Context context, OnFooEventListener onFooEventListener) { super(context); this.context = context; this.onFooEventListener = onFooEventListener; }

Step 4 – Call it within the view object’s event listener, (in this case a radio button)

Button btnOk = (Button) findViewById(R.id.btnSet); btnOk.setOnClickListener( new Button.OnClickListener() { @Override public void onClick(View v) { // step 4 - to return values from dialog onFooEventListener.fooEvent(fieldOne, fieldTwo); dismiss(); } });

Overview – So the class should look something like the following

public class FooEventDialog extends Dialog { // step 1 public interface OnFooEventListener { public void fooEvent(int fieldOne, int fieldTwo); }

// step 2

private OnFooEventListener onFooEventListener;

// Other member fields

...

// step 3

public FooEventDialog(Context context, OnFooEventListener onFooEventListener)

{ ... }

@Override

public void onCreate(Bundle savedInstanceState)

{

// other stuff

...

Button btnOk = (Button) findViewById(R.id.btnSet);

btnOk.setOnClickListener( new Button.OnClickListener()

{

@Override public void onClick(View v) { // step 4 - to return values from dialog onFooEventListener.fooEvent(fieldOne, fieldTwo); dismiss(); } }); } }

… That’s all there is to it.

Wa’Allahu A’lam !

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