Android Make a soft call with the speaker.

Question

I already read this article and several others, but I'm still not sure how to make a phone call with a speaker. Someone suggested that

Before you start a call, you register the listener and then activate the speakers. After receiving CALL_STATE_IDLE, you will remove the listener and turn off the speakers again.

But what does this mean?

Here is my code -

                Intent intentCallActivity = new Intent(context, tabWidgetActivity.class);
                intentCallActivity.putExtra("number", phoneNumber);
                intentCallActivity.putExtra("speaker", true);

                intentCallActivity.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);



                context.startActivity(intentCallActivity);

This does not work correctly. Sometimes, when I test this code, my phone speaker does not work correctly. Perhaps this is due to the fact that I do not deactivate the speakerphone. What else do I need to do?