Android Problem Summary (Android.os.NetworkOnMainThreadException exception)

Problem Description:

Android.os.NetworkOnMainThreadException exception (do not access network resources on the main thread)

Problem Analysis:

Careful study of The reason for the error is that the code does not conform to the Android specification ), online search found: android3.0 version started ( specifically is not starting from this version, do not delve into the ) on the mandatory program can not access the network in the main thread, to put the access network in a separate thread.

How to resolve:

1, If you want to ignore these mandatory policy issues, you can add in the OnCreate () method

Strictmode.setthreadpolicy (New StrictMode.ThreadPolicy.Builder ()

. Detectdiskreads (). Detectdiskwrites (). Detectnetwork (). Penaltylog (). build ());

Strictmode.setvmpolicy (New StrictMode.VmPolicy.Builder ()

. Detectleakedsqlliteobjects (). Detectleakedclosableobjects ()

. Penaltylog (). Penaltydeath (). build ());

2, put in a separate thread: (I use the click button to view the network pictures, learning)

Private Bitmap Bitmap = null;//global variable (if I put it in a local variable, I will be prompted: The immutable local variable cannot be assigned, and the lazy is put into the global variable )

Button Listener:

private final class buttonlistenerevent implements onclicklistener{@Overridepublic  void onclick (VIEW V)  {    final String path =  Imagepath.gettext (). toString ();    final handler handler = new  Handler () {    public void handlemessage (message msg) {         switch  (msg.what)  {         Case 0:            imageview.setimagebitmap ( Bitmap);            break;         default:            break;         }    }};new thread () {     public void&nBsp;run () {    try {        byte[] data  = imageservice.getimage (Path);        //  to set the bitmap for the image          bitmap = bitmapfactory.decodebytearray (data, 0,         data.length);         // Send an empty message after processing         handler.sendemptymessage (0);     } catch  (exception e)  {             // TODO Auto-generated catch block             e.printstacktrace ();             toast.maketext (Getapplicationcontext (),  r.string.error, 1)           &nBsp;  .show ();            }         }    }.start ();     }}

I am new to Android, if there is a wrong place also ask you a lot of guidance ~

Android Problem Summary (Android.os.NetworkOnMainThreadException exception)