Glad it works.
Well, what you were trying to instantiate was a View Component, weren't you?
I don't think it matters that you were using reflection for it.Why a view
component needs the looper before it is attached to an active Window, I
don't know.
On Wed, Apr 8, 2009 at 2:31 PM, Ask <asifk1...@gmail.com> wrote:
>
> It works nice after I had added only one line : "Looper.prepare();" in
> the begining of the
> public void run(); method.
>
> But still I could not understand,
>
> How Looper.prepare(); provides a handler to "Object o = c.newInstance
> ();" Line???
>
> In short, got the solution but wants some clearification.
>
> Regards,
> Asif
>
> On Apr 8, 11:44 am, Ask <asifk1...@gmail.com> wrote:
> > Hi all,
> >
> > Thanks 4 ur reply.
> >
> > Actually I want to call some methods of one Activity
> > (test.check.Test1.java) from another activity (my current activity) at
> > runtime in the separate Thread. In the main GUI Thread this works
> > fine.
> >
> > This Test1.java activity resides in the test.check.apk file which is
> > stored in the /sdcard. This is simply activity class with only one
> > function xyz() (which I want to call) and returns a String "Hellooo
> > Man" as follows
> >
> > package test.check;
> >
> > import android.app.Activity;
> > import android.os.Bundle;
> >
> > public class Test1 extends Activity {
> > /** Called when the activity is first created. */
> > @Override
> > public void onCreate(Bundle savedInstanceState) {
> > super.onCreate(savedInstanceState);
> > setContentView(R.layout.main);
> > }
> >
> > public String xyz(){
> > return "Hellooo Man";
> > }
> >
> > }.
> >
> > But during the execution of this function from another activity
> > (another .apk) at runtime in the separate Thread causes exception at
> > this line
> >
> > "Object o = c.newInstance();"
> >
> > which I came to know during debugging , otherwise class is Loaded
> > nicely and also loaded method xyz() without any problem.
> > But to execute that method I need to create Obect instance and then
> > Method.invoke(o);
> >
> > I hope u got it now.
> >
> > Dianne:: Exception race is as follows,
> >
> > 04-08 11:57:08.802: ERROR/AndroidRuntime(240): Uncaught handler:
> > thread Thread-8 exiting due to uncaught exception
> > 04-08 11:57:08.812: ERROR/AndroidRuntime(240):
> > java.lang.RuntimeException: Can't create handler inside thread that
> > has not called Looper.prepare()
> > 04-08 11:57:08.812: ERROR/AndroidRuntime(240): at
> > android.os.Handler.<init>(Handler.java:111)
> > 04-08 11:57:08.812: ERROR/AndroidRuntime(240): at
> > android.app.Activity.<init>(Activity.java:660)
> > 04-08 11:57:08.812: ERROR/AndroidRuntime(240): at
> > test.check.Test1.<init>(Test1.java:6)
> > 04-08 11:57:08.812: ERROR/AndroidRuntime(240): at
> > java.lang.Class.newInstance(Native Method)
> > 04-08 11:57:08.812: ERROR/AndroidRuntime(240): at
> > android.giude.SocketFTP.SocketFTP.readTheFile(SocketFTP.java:128)
> > 04-08 11:57:08.812: ERROR/AndroidRuntime(240): at
> > android.giude.SocketFTP.SocketFTP$1.run(SocketFTP.java:50)
> >
> > Mariano : I have not used Looper.prepare(),
> > Is it required?? If yes then where and how to define
> > handler for that?
> > On Apr 7, 10:20 pm, Dianne Hackborn <hack...@android.com> wrote:
> >
> >
> >
> > > 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.- Hide quoted text -
> >
> > > - Show quoted text -- Hide quoted text -
> >
> > - Show quoted text -
> >
>
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