CODEWITHSUNDEEP
androidmultithreadingtextviewandroid-edittexthandler
Dan1676
Dan1676

Reputation: 1725

Android Update TextView via Handler on separate thread

I am currently working on my first Android App for Uni. I am slowly getting there but I am stuck on a certain section.

The coursework requires a separate thread to that of the UIthread. My idea is the user can set their names in Name_edit.java then when they go to board.java (a different activity) the two textviews are now displaying what was entered

In the Name_edit.xml I have two edittexts.

In the board.java I have two textviews (currently set to P1 and P2 respectively). In the OnCreate() I am currently working on a handler to get the two values from (name_edit) the two edittexts and set this to the textviews. I believe this will require two handlers (one for each value). In the board.java I have done the standard findViewById.

Any help on Handlers and Threads would be helpful.

I would post my handler code but it is current changing constantly. What I am working on is 

handler = new Handler() {
    public void handleMessage (Message msg) {
        TextViewP1.setText(msg)
    }
};

Note msg is currently not set to an edittext from name_edit

Upvotes: 3

Views: 1579

Answers (1)

shanet
shanet

Reputation: 7334

Have you tried runOnUiThread()? UI elements can only be changed from the UI thread and your handler here runs on it's own thread.

handler = new Handler() {
    public void handleMessage (Message msg) {
        ((Activity)context).runOnUiThread(new Runnable() {
            public void run() {
               TextViewP1.setText(msg);
            }
        });
    }
}

where context can be replaced with [class name].this if your handler is in your Activity class.

Docs: http://developer.android.com/reference/android/app/Activity.html#runOnUiThread(java.lang.Runnable)

Upvotes: 1

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