update Main UI Thread or AsyncTask never allowed than where can i update UI thread?

Question

Caused by: android.os.NetworkOnMainThreadException
04-25 13:15:52.362: E/AndroidRuntime(20900):    at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at libcore.io.IoBridge.connect(IoBridge.java:112)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at java.net.Socket.connect(Socket.java:842)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at libcore.net.http.HttpConnection.<init>(HttpConnection.java:76)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:340)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:87)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at libcore.net.http.HttpConnection.connect(HttpConnection.java:128)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:316)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at libcore.net.http.HttpEngine.connect(HttpEngine.java:311)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:290)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:240)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at libcore.net.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:81)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at java.net.URLConnection.getContent(URLConnection.java:190)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at java.net.URL.getContent(URL.java:447)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at biz.xicom.printvintage.HomeScreen$2.run(HomeScreen.java:199)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at android.app.Activity.runOnUiThread(Activity.java:4644)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at biz.xicom.printvintage.HomeScreen.setview(HomeScreen.java:193)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at biz.xicom.printvintage.HomeScreen.onCreate(HomeScreen.java:58)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at android.app.Activity.performCreate(Activity.java:5104)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)

code

    for (int i = 0; i < image_list.size(); i++) {
        LayoutInflater layoutInflator = HomeScreen.this.getLayoutInflater();
        LinearLayout childlayout = (LinearLayout) layoutInflator.inflate(
                R.layout.image_text_web_services_inflate, mPager, false);
        im = (ImageView) childlayout.findViewById(R.id.image_web_service);
        t = (TextView) childlayout.findViewById(R.id.text_web_service);

        t.setText(HomeScreen.detail_list.get(i));
        final int j=i;
        runOnUiThread(new Runnable() {
            public void run(){   
                try {
                    Bitmap bitmap = BitmapFactory
                            .decodeStream((InputStream) new URL(
                                    HomeScreen.image_list.get(j))
                                    .getContent());
                    im.setImageBitmap(bitmap);
                } catch (MalformedURLException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        });

        mPager.addView(childlayout);
    }

i read below link:

Load More - Only the original thread that created a view hierarchy can touch its views

android - Caused by: android.view.ViewRootImpl$CalledFromWrongThreadException

Every one said

You are trying to update your Main UI Thread or AsyncTask never allowed that.

then where i can update or show my image.

Also try AsyncTask. than how to implement on loop

Make and asynctask that in background fetches the bitmap and onPostExecute sets it to your ImageView. Also incorporate caching is another tip. There are loads of examples out there. — David Olsson, Apr 25 '13 at 13:26
@DavidOlsson im on loop so how can i send loop value to onPostExecute. — duggu, Apr 25 '13 at 13:28
@IceMAN It's not possible duplicate, here issue is somewhat different. — Paresh Mayani, Apr 25 '13 at 13:29
@HCD, take a read over at http://developer.android.com/training/displaying-bitmaps/process-bitmap.html — David Olsson, Apr 25 '13 at 13:29
@IceMAN i now question is repeated i m not satisfying those answer and will u read my question properly. — duggu, Apr 25 '13 at 13:30
@HCD: No need to be rude fella! If my flag is wrong, my apologies. The other users will ignore it if everyone agrees it is wrongly marked duplicate. — Siddharth Lele, Apr 25 '13 at 13:32
Create a solution for one iteration in the loop and use it for all. Handle the Network stuff in a background thread (Just like all the google answers says and the exception). And then update the ImagView in onPostExecute. — David Olsson, Apr 25 '13 at 13:33
@IceMAN the thing is nobody can read whole question they just go only for heading thats my bad luck !!! — duggu, Apr 25 '13 at 13:35

score 1 · Accepted Answer · answered Apr 25 '13 at 13:28

1

As you are trying to load Images inside Loop, I would suggest you to implement logic of Lazy loading of Images.

Here are some libraries you can give a try:

answered Apr 25 '13 at 13:28

Paresh Mayani

127,700
71
241
295

score 1 · Answer 2 · answered Apr 25 '13 at 13:56

1

Use this code It will help,

StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);

answered Apr 25 '13 at 13:56

No_Rulz

2,679
1
20
33

where i can put this code in my activity – duggu Apr 25 '13 at 13:59
before running your thread – No_Rulz Apr 25 '13 at 14:00

score 0 · Answer 3 · edited Aug 25 '13 at 12:16

You are calling a web service in UI thread. Android does not allow you to perform network operation in UI thread from API>=3.0.

Solutions:

Load images in a different thread.

new Thread()
{
     @Override
     public void run() 
     {
        // load image here
        super.run();
     }
}.start();

Using LazyList would be a great solution for this problem.

You may use AsyncTask too.

class MyAsyncTask extends AsyncTask<String, String, String> {

@Override
protected void onPreExecute() {
 // Runs on UI thread- Any code you wants 
 // to execute before web service call. Put it here.
 // Eg show progress dialog
}
@Override
protected String doInBackground(String... params) {
  // Runs in background thread
    String result = //your web service request;         

     return result;
}

@Override
protected void onProgressUpdate(String... values) {
    super.onProgressUpdate(values);
}

@Override
protected void onPostExecute(String resp) {

  // runs in UI thread - You may do what you want with response 
  // Eg Cancel progress dialog - Use result         
}
}

update Main UI Thread or AsyncTask never allowed than where can i update UI thread?

3 Answers3