Maybe your example is simplified, but if this method you want to call
(xyz()) is really this simple (i.e. it does not really need a whole
activity and all its functionality (Looper and such)), refactor your
code and put this 'xyz()' in a class that is not an activity and refer
to this class by both activities.
public class Test1 extends Activity {
private CommonClass mCommon = new CommonClass();
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
public String xyz(){
return mCommon.xyz();
}
}.
public class CommonClass {
public String xyz(){
return "Hellooo Man";
}
}
And from the other activity:
...
...
c = loader.loadClass("test.check.CommonClass");
Log.i("See"," Test Class Found ....");
Method method = c.getMethod("xyz", null);
Object o = c.newInstance(); // This line throws
String s = (String) method.invoke(o);
...
...
On Apr 8, 2:44 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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