keeping the state of the previous activity
keeping the state of the previous activity
If I am working on Activity A and I want to start Activity B, I do the following to start Activity B:
Intent detailsIntent = new Intent(ActivityA.this, ActivityB.class);
detailsIntent.putExtra(EXTRA_MESSAGE, value);
startActivity(detailsIntent);
When I press the back button on Activity B, a new Activity A will be created and my old state is gone. I don't want to use savedInstanceState to restore some variables but I want the first Activity A to come back in the exact same state I left it in.
savedInstanceState
EDIT:
The relevant AndroidManifest.xml
<activity
android:name=".ActivityA"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".ActivityB"
android:parentActivityName=".ActivityA" />
When I press the back button on Activity B, a new Activity A will be created How? Please post your Manifest as the default behaviour is that Activity A is put in the backstack when the Activity B is launched, and its state is automatically restored when you press back on Activity B.– Eselfar
Jul 2 at 9:40
When I press the back button on Activity B, a new Activity A will be created
Activity A will be kept in memory for a period of time except you manually call
finish on it, so your problem needs more information to find out. But for memory and performance concern, Android can swipe Activity A at any time if your app consumes too much memory, or your app goes to the background for too long. And for this reason, savedInstanceState is there to ensure your app won't crash. You have to learn to use it sooner or later.– Tam Huynh
Jul 2 at 9:50
finish
savedInstanceState
might be you have written some code in onResume() of Activity A.. if yes, please move that to onCreate of Activity A
– Manoj Bhadane
Jul 2 at 10:17
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I don't want to use savedInstanceState to restore some variables but I want the first Activity A to come back in the exact same state I left it in. ... then you should change target platform ... savedInstanceState (or persistent storage) is the way to do this on android OS
– Selvin
Jul 2 at 9:37