Question

I want to create an application which has the following functionality. It should save its
.apk file to the sdcard. Imagine I have a Button. On clicking it I have to save the .apk file of the application.

Answer 1

It is easy to do that..

1. First you get all installed applications,
2. For each one, get public source directory.
3. copy the file to the SDCard.

Note: No need to be rooted.

Here is the snippt code:

final Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);
mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);
List<ResolveInfo> apps = getPackageManager().queryIntentActivities(mainIntent, 0);
for (ResolveInfo info : apps) {
    File file = new File(info.activityInfo.applicationInfo.publicSourceDir);
    // Copy the .apk file to wherever
}