Start a new intent without the need to click a button : Beginner level ANDROID developing issues

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Start a new intent without the need to click a button

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Ryo

Post subject: Start a new intent without the need to click a button

Posted: Sun Jul 05, 2009 5:48 pm

Joined: Sun Jul 05, 2009 5:27 pm
Posts: 3

Hi guys,

I am an android newbie; I'm developing an application and I have to finish soon because of some deadlines.
I'm facing problem about the intent/activities.

I can't find another way to run a new activity without the use of a view listener.
For example:

Code:

public final Button.OnClickListener bnt= new Button.OnClickListener() { 
       public void onClick(View view) {          
          Intent i = new Intent(view.getContext(), MyActivity.class);         
          view.getContext().startActivity(i);            
       } 
     };

This code always works.

But if I try to use something like the following

Code:

Intent i = new Intent("myPackage.MyActivity");         
startActivity(i);

outside an onClick method (for example in the MyActivity.onCreate method or inside the MyActivity.onActivityResults method), I always get an error.
This is the latest error I recived when I tried to run my application in the way Ive explained.

ERROR/AndroidRuntime(866): Uncaught handler: thread main exiting due to uncaught exception
ERROR/AndroidRuntime(866): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.emp/com.emp.Activity}: android.content.ActivityNotFoundException: No Activity found to handle Intent { action=com.emp.CodeActivity (has extras) }....

My need is to:
1) Run an activity clicking a button: OK
2) Get the reulst: OK
3) Automatically redirect the user to another activity to manage the results: ERROR

I don't want to let the user push a button to go ahed to the third step.

I hope I've been enough clear; thank a lot for help.

Giovanni

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Verix

Post subject: Re: Start a new intent without the need to click a button

Posted: Mon Jul 06, 2009 2:01 pm

Joined: Thu Dec 27, 2007 2:51 pm
Posts: 41

Hi Giovanni,
for sure you should be able to start an activity also from outside the onClick method, so in principle your code should work.. :mrgreen:

You receive the exception because the activity can not be found to execute the given Intent: have you properly declared this activity in your AndroidManifest.xml ?

Hope you find a solution for this issue.
BR

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barban

Post subject: Re: Start a new intent without the need to click a button

Posted: Mon Jul 06, 2009 2:06 pm

Joined: Thu Dec 27, 2007 6:09 pm
Posts: 65

Hi,
I suggets to try the class variant of the Intent constructor:

Code:

Intent i = new Intent(this, MyActivity.class);

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Ryo

Post subject: Re: Start a new intent without the need to click a button

Posted: Mon Jul 06, 2009 7:44 pm

Joined: Sun Jul 05, 2009 5:27 pm
Posts: 3

The activity class is reistered into the manifest, infact it works when I start it inside an onclick method.
I'm not able to execute it inside the startActivityForResult.

This works...

Code:

public final Button.OnClickListener search = new Button.OnClickListener() { 
       public void onClick(View view) {          
          Intent i = new Intent(view.getContext(), MyActivity.class);         
          view.getContext().startActivity(i);            
       } 
     };

This doesn't....

Code:

public void onActivityResult(int requestCode, int resultCode, Intent intent) { 
     if (requestCode == 0) { //Scanner
           if (resultCode == RESULT_OK) { 
               startActivity(new Intent(MyActivity.class));
           } else if (resultCode == RESULT_CANCELED) { 
               // Handle cancel 
           } 
       }     
  } 

Another thing: I was wrong when I posted the error message... this was releated to another error.
I really can't view the error message cause the only way I have to test the application is on an android based mobile; this because the onActivityResult method is referred to an activity that execute an external application that is not installed in the emulator.
The external application is correctly called but when it finishes its lifecycle, if I invoke the startActivity(new Intent(MyActivity.class)); inside the onActivityResult the application fails the execution. Otherwise it correctly come back to the previous activity.

Thanks in advance for help,

Giovanni

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