Nik aminalzanki

System directories

Method	Result
Environment.getDataDirectory()	/data
Environment.getDownloadCacheDirectory()	/cache
Environment.getRootDirectory()	/system

External storage directories

	// Dagger 1 example
	@Module(
	complete = false,
	library = true
	)
	public final class ApiModule {
	@Provides
	@Singleton
	Retrofit provideRetrofit(Gson gson, Application app) {
	return new Retrofit.Builder()

	public class Navigator{
	private final FragmentManager mFragmentManager;

	public Navigator(final FragmentManager fragmentManager){
	mFragmentManager = fragmentManager;
	}

	public Fragment getActiveFragment() {
	if (mFragmentManager.getBackStackEntryCount() == 0) {
	return null;