How can I clear the Android app cache?

Question

I am writing a app which can programatically clear application cache of all the third party apps installed on the device. Following is the code snippet for Android 2.2

Answer 1

I'm not sure how appropriate this is in terms of convention, but this works so far for me in my Global Application class:

    File[] files = cacheDir.listFiles();
    for (File file : files){
        file.delete();
    }

Of course, this doesn't address nested directories, which might be done with a recursive function like this (not tested extensively with subdirectories):

deleteFiles(cacheDir);

private void deleteFiles(File dir){
    if (dir != null){
        if (dir.listFiles() != null && dir.listFiles().length > 0){
            // RECURSIVELY DELETE FILES IN DIRECTORY
            for (File file : dir.listFiles()){
                deleteFiles(file);
            }
        } else {
            // JUST DELETE FILE
            dir.delete();
        }
    }
}

I didn't use File.isDirectory because it was unreliable in my testing.