Private storage in 2.1?

I need 开发者_高级运维to store files on SD card or other storage. I'd like this storage

• to be private (not very critical)
• to go away on app uninstall
• not to be erased by OS if resources limited

User will take pictures and they will be uploaded to server. I want to be more or less sure that I have those files until they uploaded and then I will delete them on completion.

I thought getExternalFilesDir is what I need but it's only from API 8 and I develop for API 7 (2.1)

What should i use? What is my best option? Also, is there any way to check available space? I need maybe 2-5Mb total..

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Just store it within your apps data folder and you are good.