Also you need to look at the exception stack trace. It will show you who is
trying to create a Handler.
On Tue, Apr 7, 2009 at 9:44 AM, Streets Of Boston
<flyingdutc...@gmail.com>wrote:
>
> But do you want a Looper and Handler in your thread 't'?
> Why do you load it in another thread?
> Are you planning in dispatching and handling messages in this thread
> 't'?
>
> If not, don't start adding all this stuff just to make the run-time
> happy.
>
> Put a breakpoint in your default constructor of your test.check.Test1
> class and see which line of code needs a Handler or Looper.
>
> What are you trying to accomplish? It looks like you're trying to load
> and construct a class from an APK (check.apk). Are you initializing an
> Activity from this APK called 'Test1'? If so, I understand why it may
> need a looper/handler. But if you're loading an Activity (Test1)
> within another Activity (the one trying to load check.apk), you may
> get into a heap of other trouble. But i'm not an expert on this at
> all. Google engineers will know much more about this.
>
>
> On Apr 7, 10:55 am, Ask <asifk1...@gmail.com> wrote:
> > Hi Streets,
> >
> > I dont think this is the case.
> >
> > Same code executes nicely If I call that method in the onCreate()
> > method (i.e. main thread itself)
> >
> > problem occurs in the Object creation if I will call this method
> > readTheFile() in the Thread.
> > Can you give any info. regarding how I can define Looper and Handler
> > in my code to execute it without any error.???
> >
> > On Apr 7, 7:00 pm, Streets Of Boston <flyingdutc...@gmail.com> wrote:
> >
> >
> >
> > > It could be that during the construction of class test.check.Test1, a
> > > Handler or something similar (i.e. something needing the main-thread's
> > > message-queue) is constructed. Look at your test.check.Test1
> > > implementation and see if this is the case.
> >
> > > If this is the case, you will get an exception if the constructor of
> > > test.check.Test1 is executed on any other thread than the main-thread
> > > with the message queue.
> >
> > > You would have gotten the same exception if you would have called 'new
> > > test.check.Test1()'.
> >
> > > On Apr 7, 9:17 am, Ask <asifk1...@gmail.com> wrote:
> >
> > > > Is there any handler needed for that?? Any Idea???
> >
> > > > On Apr 7, 3:58 pm, Ask <asifk1...@gmail.com> wrote:
> >
> > > > > Hi,
> >
> > > > > I am using Reflection APIs in the background thread to call a
> method
> > > > > dynamically from another application but I am getting the
> Exception:
> >
> > > > > "java.lang.RuntimeException: Can't create handler inside thread
> that
> > > > > has not called Looper.prepare() "
> >
> > > > > at a line : Object o = c.newInstance();
> >
> > > > > my code in the Thread is as follows,
> > > > > onCreate
> >
> > > > > public void onCreate(Bundle icicle) {
> > > > > super.onCreate(icicle);
> > > > > setContentView(R.layout.main);
> >
> > > > > hh_text = (TextView)findViewById(R.id.server_start);
> >
> > > > > Thread t = new Thread()
> > > > > {
> > > > > public void run()
> > > > > {
> > > > > readTheFile();
> >
> > > > > }
> >
> > > > > };
> > > > > t.start();
> > > > > }
> >
> > > > > public void readTheFile() {
> > > > > try {
> >
> > > > > PathClassLoader loader = new PathClassLoader(
> "/sdcard/
> > > > > test.check.apk", ClassLoader.getSystemClassLoader());
> > > > > Class c = null;
> >
> > > > > c = loader.loadClass("test.check.Test1");
> >
> > > > > Log.i("See"," Test Class Found ....");
> >
> > > > > Method method = c.getMethod("xyz", null);
> >
> > > > > Object o = c.newInstance(); // This line throws
> exception
> > > > > String s = (String) method.invoke(o);
> > > > > Log.i("See","Got method: " + s);
> > > > > } catch (Exception e) {
> > > > > // TODO Auto-generated catch block
> > > > > e.printStackTrace();
> > > > > } }
> >
> > > > > Please help.. If you know the issue.
> >
> > > > > On Apr 6, 7:14 pm, Ask <asifk1...@gmail.com> wrote:
> >
> > > > > > Thanx Mark for your quick reply. I will try it out and get back
> >
> > > > > > On Apr 6, 6:49 pm, Mark Murphy <mmur...@commonsware.com> wrote:
> >
> > > > > > > Asif k wrote:
> > > > > > > > But in my case, I am getting all 3 messages at a time
> after
> > > > > > > > activity execution completed.
> >
> > > > > > > That is probably because you are doing long-running work on the
> UI thread.
> >
> > > > > > > > Is there any API available, using which
> > > > > > > > I can show the status during the execution also.
> >
> > > > > > > Anything long-running should be in a background thread, in the
> activity
> > > > > > > or wrapped in a service. Then, use Handler or runOnUiThread()
> or
> > > > > > > something so the background thread can have the UI thread
> update your
> > > > > > > TextView.
> >
> > > > > > > --
> > > > > > > Mark Murphy (a Commons Guy)http://commonsware.com|
> http://twitter.com/commonsguy
> >
> > > > > > > Android App Developer Training:
> http://commonsware.com/training.html-Hidequotedtext-
> >
> > > > > > - Show quoted text -- Hide quoted text -
> >
> > > > > - Show quoted text -- Hide quoted text -
> >
> > > > - Show quoted text -- Hide quoted text -
> >
> > > - Show quoted text -- Hide quoted text -
> >
> > - Show quoted text -
> >
>
--
Dianne Hackborn
Android framework engineer
hack...@android.com
Note: please don't send private questions to me, as I don't have time to
provide private support, and so won't reply to such e-mails. All such
questions should be posted on public forums, where I and others can see and
answer them.
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