android:minSdkVersion="4" causing strange problems

I built my applications without specifying a minimum sdk in the beginning. However after I added that line to publish to market I found my applications are behaving very differently fo开发者_如何学JAVAr example buttons are smaller, etc... In particular I'm having problems with an application that records sound which was working fine when no minimum sdk was specified, but crashes when I specify one. I've tried specifying the minsdk to that of my phone which is 7, but that doesn't seem to help. What's the default minimum sdk when none is specified? I just want my application to run like it does normally.

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If you don't specify a minimum or target SDK version you get a lot of compatibility mode behavior. The device you're running on is probably a HDPI device and you were probably looking at a UI scaled for compatibility mode before you added the minSdkVersion, hence the smaller buttons - your app is now running at the device's native resolution.

Apps that target SDK 3 and below acquire several permissions by default that must be explicitly requested by apps targeting newer SDK versions. Check your exception message when your app crashes, it might be a security exception for a permission that you need to explicitly request in your manifest.

See the following link for more info: http://developer.android.com/guide/practices/screens_support.html