Start an activity from code

I have a package name and an activity name and开发者_如何学C I want to start a new class or activity using it. Is it possible to start the activity from code without declaring the same activity in the manifest file?

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You can't start an activity if it isn't declared in the Manifest. All you might do is change the views programaticaly, but not the activity.

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No, you can't do this (see the 2nd paragraph of the Activity 'Class Overview'). However...

1. If you want to do this to prevent people launching sub-activities directly, you can put logic in to detect the launching activity (via Activity.getCallingActivity / Activity.getCallingPackage) - you'll need to use StartActivityForResult to do this

2. You might be able to achieve what you want through a ClassLoader - more details on what you're doing (and why) would be useful.

3. If you're trying to launch an activity defined in a different package, then it only needs to be declared in the other package's manifest - you can then specify it with Intent.setClassName

Hope this helps,

Phil Lello