While I havent had any problems, apparently others are. The best way to avoid problems with apps on Android and even Apple? Do research on the app before download. See what the user comments are. You dont need to do more than a few minutes of research to find if the app is bad or not but it can save you. That alone should prevent pretty much every type of app problem.
Here is an article that discusses the issue
Want to know what the best malware app are:
