[DEV] I want to develop Android apps. Please help. - Nexus One Android Development

Hey guys.
I'm an experienced .NET Developer and developed with java a little. I want to start developing Android apps on Windows.
I downloaded everything and my app runs, but once i debug it i get a strange error: "The JAR of this class file belongs to a container "Android 2.1-update1" which does not allow modifications to source attachments on its entries".
While looking on the internet to find a solution i came upon a few blogs that explain that i need to get the android source: http://stackoverflow.com/questions/...-container-android-2-0-1-which-does-not-allow
I'm having an immense headache getting it because nothing works. There's no simple guide to do this.
If any of you know the error and can help me solve it i would appreciate it.
Also, if you know how to get the source please let me know. I'm going crazy here.
Thanks!

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lorin.bute said:
Hey guys.
I'm an experienced .NET Developer and developed with java a little. I want to start developing Android apps on Windows.
I downloaded everything and my app runs, but once i debug it i get a strange error: "The JAR of this class file belongs to a container "Android 2.1-update1" which does not allow modifications to source attachments on its entries".
While looking on the internet to find a solution i came upon a few blogs that explain that i need to get the android source: http://stackoverflow.com/questions/...-container-android-2-0-1-which-does-not-allow
I'm having an immense headache getting it because nothing works. There's no simple guide to do this.
If any of you know the error and can help me solve it i would appreciate it.
Also, if you know how to get the source please let me know. I'm going crazy here.
Thanks!
Click to expand...
Click to collapse
You say you downloaded "everything", but not what "everything" is. For mainstream development (using only public API), you don't need the Android sources.
Get the SDK, and Eclipse ADT if you want the most straightforward environment, import one of the example projects, and get it running on the emulator/device. It's pretty much all explained in this tutorial project. Then you can see what's up with your particular program. Good luck!

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I have Eclipse, the latest ADT and the latest SDK. I installed the packages for 2.2 and 2.1 with the Google APIs.
I'm trying to make a simple tip calculator app. If i don't make a certain check in my app everything runs ok. As soon as i check if 3 EditTexts have text in them i get that error.
If i don't need to check, my app is behaving ok.
if(txtbillamount.getText().toString().equals("") || txtpercentage.getText().toString().equals("") || txtpeople.getText().toString().equals(""))
{
...
}
The hello world apps works fine.

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lorin.bute said:
I have Eclipse, the latest ADT and the latest SDK. I installed the packages for 2.2 and 2.1 with the Google APIs.
I'm trying to make a simple tip calculator app. If i don't make a certain check in my app everything runs ok. As soon as i check if 3 EditTexts have text in them i get that error.
If i don't need to check, my app is behaving ok.
if(txtbillamount.getText().toString().equals("") || txtpercentage.getText().toString().equals("") || txtpeople.getText().toString().equals(""))
{
...
}
The hello world apps works fine.
Click to expand...
Click to collapse
Do you have an else statement?

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Yes I do have an else statement. I display a pop up message in the else statement.

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I would recommend getting acquainted with a little bit of java code as it is very different than .net
Your dev env seems too be ok since, The hello world app works ok as you stated, its your coding.
Coming from.net programming it was confusing for me at first.
Sent from my Nexus One using XDA app

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Problem solved.
Yes, i was coding something in a wrong way. Java is different in many aspects.
Thanks.