Question

Steps:

1. User starts app from Android Market application

2. User clicks “Start child”

   stack: ActivityMain > ActivityChild

3. User presses home button and returns to the app through “launch icon”

4. Android opens “last task” + create next ActivityMain

   stack: ActivityMain > ActivityChild > ActivityMain

I expect that click on “lauch icon” will just return to previous stack [without actually creating new activity].
I expect stack:

ActivityMain > ActivityChild

How to achive it???

On the other hand, when user in the above 1st step starts app dicertly from “launch icon” then the problem does’n exist.

Manifest:

<application
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name" >
    <activity
        android:label="ActivityMain"
        android:name=".ActivityMain" >
        <intent-filter >
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity
        android:label="ActivityChild"
        android:name=".ActivityChild" >
    </activity>
</application>

Thanks for help!

Answer 1

Solution:

Introduce “launcher activity” which is responsibe for:
– either starting new task,
– or restoring previous task.

Launcher is started as “singleInstance”.

public class ActLauncher extends Activity {
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Intent i = new Intent(this, ActivityChild1.class);
        startActivity(i);
        finish();
    }
}

For example, assume we have activities:

ActLauncher [mode=singleInstance]  
ActChild1 [mode=standard]  
ActChild2 [mode=standard]

Now at some moment user executed sequence:

AndroidMarket > ActLauncher > ActChild1 > ActChild2

then HOME
and then return to app but by launcher icon “ActLauncher”.
This brings user to full previous back stack:

ActChild1 > ActChild2

I applied the solution in this app
There:
– ActLauncher = “invisible”
– ActChild1 = main screen
– ActChild2 = game screen

Best wishes!