[FIXED] How to get back a reply through a message in Android activity

Issue

How can I get back a Message reply to the Activity in Android? Say an Activity ask one of a java object (Running Thread) to do something and give back the reply. How java object can know to reply back to the activity who sent the message? I have many activities and many objects communicate with each other.
How can I implement this with Android Messages? I don't want to use broadcasting here.

Solution

We can use Messenger for this. Can set the messenger as the reply path. And inside message it hold the handler it should give back the reply.

final Messenger messenger = new Messenger(handler); 
. 
.
msg.replyTo = messenger;  // set the handler of the reply activity.
msg.setData(mBundle);     // if any additional data available put to a bundle
destinationClass.mHandler.sendMessage(msg);



// in destination class

Messenger msger = msg.replyTo;  // get the message sender's details.

Message msg2 = Message.obtain();
msger.send(msg2);                // send the reply message again to the sender

Answered By - user2771655

Answer Checked By - David Goodson (PHPFixing Volunteer)