Threading Example in Android

10

The first two links are not working.. For the first link, try [link](http://android-developers.blogspot.com/2009/05/painless-threading.html) For the second link, try [link](http://developer.android.com/guide/components/processes-and-threads.html) – Dexter Jun 27 '12 at 14:57
5

The answer is almost 1.5 year old. I try to update the links. – RoflcoptrException Jun 27 '12 at 18:34
you are really nice to have answered an unspecific question such as this – A Person Mar 29 '13 at 16:44
1

I'd disagree that it is a non-specific question: it's asking the community for a very particular type of example, with a very particular focus. – WillC Nov 14 '16 at 22:07

score 11 · Answer 2 · edited Aug 29 '17 at 10:33

11

One of Androids powerful feature is the AsyncTask class.

To work with it, you have to first extend it and override doInBackground(...). doInBackground automatically executes on a worker thread, and you can add some listeners on the UI Thread to get notified about status update, those functions are called: onPreExecute(), onPostExecute() and onProgressUpdate()

You can find a example here.

Refer to below post for other alternatives:

Handler vs AsyncTask vs Thread

edited Aug 29 '17 at 10:33

Ravindra babu

37,698
11
250
211

answered Jan 18 '11 at 10:46

Endian Ogino

146
3

.. I'm fairly certain your link is dead. – While-E Apr 18 '11 at 05:00
@While-E I'm afraid you're right – Endian Ogino Apr 20 '11 at 23:05
2

I've just updated the link. The blog has moved to this new location: [link](http://android-jotting.blogspot.com/2010/09/using-asynctasks-in-android.html) – slybloty Dec 09 '11 at 15:57

score 9 · Answer 3 · edited Dec 15 '14 at 15:22

9

Here is a simple threading example for Android. It's very basic but it should help you to get a perspective.

Android code - Main.java

package test12.tt;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class Test12Activity extends Activity {

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        final TextView txt1 = (TextView) findViewById(R.id.sm);

        new Thread(new Runnable() { 
            public void run(){        
            txt1.setText("Thread!!");
            }
        }).start();

    }    
}

Android application xml - main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <TextView  
    android:id = "@+id/sm"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"/>

</LinearLayout>

edited Dec 15 '14 at 15:22

Paritosh

2,097
3
30
42

answered Oct 10 '11 at 02:25

mbejda

1,471
16
25

51

This seems to me like an incorrect example, since a UI update is being done from a background thread. – Frank Harper Feb 26 '12 at 17:01
1

If you are updating ui thread you should use handler, because it's the middle layer between ui thread and your spawn thread , that way you will stay safe from dead locking – hackp0int Jun 24 '12 at 19:44
2

https://developer.android.com/guide/components/processes-and-threads.html exactly discourages this kind of programming since it violates "Do not access the Android UI toolkit from outside the UI thread" rule – Serkan Arıkuşu Jan 15 '13 at 21:33
1

I'm pretty sure in recent versions of Android it would not even work sometimes like this. – Giszmo Apr 28 '15 at 04:01
1

It violates the second rule of the single-threaded model: do not access the Android UI toolkit from outside the UI thread – ThePatelGuy Mar 15 '16 at 03:56

Threading Example in Android

3 Answers3

Linked