android - Only one instance of entire app multiple activities -

i have android app 3 activities. want have 1 instance encompasses 3 activities.

so activities a, b, , c, want user able looking @ 1 of @ time. not want multiple instances of of these activities. have tried android:launchmode="singletask" sort of works in way, when user returns app, launches activity again first instead of going activity b, user pressed home button.

would best me moved fragments hosted these activities 1 activity , away activities b , c? activity hosts 1 fragment, login/signup page.

using singletask launch mode need still add intent flags when starting other activities?

so activities a, b, , c, want user able looking @ 1 of @ time.

you can have 1 activity on focus @ time. activity might visible behind activity (i.e. top activity might themed dialog), 1 activity has focus; hence user can interact 1 activity @ time.

it launches activity again first instead of going activity b

android launch first activity labeled as

 <intent-filter>         <action android:name="android.intent.action.main" />         <category android:name="android.intent.category.launcher" />  </intent-filter> 

in androidmanifest.xml. can add logic create illusion activity not called, , launch intent corresponding one.

would best me moved fragments hosted these activities 1 activity , away activities b , c?

that entirely you. in opinion, might feel more proper use fragments since can replace them based on logical conditions (i.e. logged in or not) without having create new activity (it might seem more seamless user).