Kill activity when it comes to foreground

Question

i m writing an application n stuckup with one problem.I have three activity A,B and C. when i goes from activty A to B and B to C and if i press menu button on device.my application goes into background state. when i reopen application it shows Activity C. I want when i reopen my application it should shows Activity A instead of any other activity from Activity stack. I have gone through some activity lifecycle method and try to override it.i have override onStart() ,onPause() method and finsh activity C as well as Activity B and the problem i m facing is when i go from Activity C to activity D activity C finish all background activity n m not able to go back to acitvity C on finish of Activity D. Can anyone help me how to show specific acitivity on resume of application?? thansks in advance.

here is my manifest.xml

<uses-sdk android:minSdkVersion="4" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.READ_PHONE_STATE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<application    
              android:icon="@drawable/icon"
              android:label="@string/app_name"
              android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen" >

    <activity   
        android:label="@string/app_name"
        android:name="com.buttonpay.Login"
        android:screenOrientation="portrait"
        android:clearTaskOnLaunch="true" >
        <intent-filter >
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>


     <activity android:name=".ButtonPayActivity"
                android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen"
                android:screenOrientation="portrait"/>    


    <!-- HomeTab Activity -->

            <activity android:name="com.buttonpay.home.Utilities"
                        android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen"
                        android:screenOrientation="portrait"/>


            <activity android:name="com.buttonpay.home.Top_up"
                        android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen"
                        android:screenOrientation="portrait"/>
            <activity android:name="com.buttonpay.home.HomeScreen"
                        android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen"
                        android:screenOrientation="portrait"/>

            <activity android:name="com.buttonpay.home.MyAccount"
                        android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen"
                        android:screenOrientation="portrait"/>
             <activity android:name="com.buttonpay.home.TransactionHistory"
                        android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen"
                        android:screenOrientation="portrait"/>
              <activity android:name="com.buttonpay.home.TransactionDetailsActivity"
                        android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen"
                        android:screenOrientation="portrait"/>
                <activity android:name="com.buttonpay.home.TransactionList"
                        android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen"
                        android:screenOrientation="portrait"/>
               <activity android:name="com.buttonpay.home.BusinessSummaryActivity"
                        android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen"
                        android:screenOrientation="portrait"/>
               <activity android:name=".home.MobileMoneyActivity"
                        android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen"
                        android:screenOrientation="portrait"/>


     <!-- balance tab Activity -->
            <activity android:name="com.buttonpay.balance.BalanceTab"
                        android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen"
                        />



     <!-- Favouritetab Activity -->
             <activity android:name="com.buttonpay.favourite.FavouriteTab"
                        android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen"
                        />

  <!-- ComingSoon -->
<activity android:name="com.buttonpay.home.ComingSoon"
                        android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen"
                        android:screenOrientation="portrait"/>

 <!-- Settings -->
<activity android:name="com.buttonpay.settings.SettingList"
                        android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen"
                        android:screenOrientation="portrait"/>



</application>

Answer 1

In the manifest, set this on your root activity (that is the first one that gets launched in your application, the one with ACTION_MAIN and CATEGORY_LAUNCHER):

android:clearTaskOnLaunch="true"

You don't need to do anything else. No overriding of lifecycle methods.

EDIT Add additional information after some empirical experimentation:

You need to make sure that your root activity is always in the task's activity stack to make this work. This means that you can't call finish() on the root activity until the user actually wants to quit your application (ie: when he presses the BACK key when in your root activity).

In your example you have a LoginActivity, MenuActivity and DescriptionActivity and the LoginActivity is the root activity. When the LoginActivity launches the MenuActivity it cannot call finish() on itself. In this case, when the user presses the BACK key while in the MenuActivity, it will return to the LoginActivity. If this isn't what you want then you need to set a flag in the LoginActivity that you've already launched the MenuActivity and when onResume() is called you can check that flag to determine if you are returning from the MenuActivity and in that case you can just immediately call finish().