CODEWITHSUNDEEP
androidandroid-activityback-stack
A. Badakhshan
A. Badakhshan

Reputation: 1043

Two activities in task manager of same app

My application have two activities, say MainActivity and SecondActivity. Main activity is declared as android:launchMode="singleInstance" and its orientation is always portrait. Second activity is always has landscape orientation.

In some devices, everything is alright and in task manager there is only one instance of my app, but in some devices (like Samsung S7), when I launch SecondActivity, there will be two instances of my app in task manager like this image:

enter image description here

My guess is that something is wrong with the launchMode of the MainActivty but I need it to be singleInstance. Any suggestion?

EDIT:

MainActivity in manifest:

<activity
    android:name=".Activities.MainActivity"
    android:screenOrientation="portrait"
    android:launchMode="singleInstance"
    android:theme="@style/AppTheme"
    android:windowSoftInputMode="adjustPan">
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />

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

and second:

<activity
    android:name=".Activities.SecondActivity"
    android:screenOrientation="landscape" />

launching code:

Intent intent = new Intent(getActivity(),  
intent.putExtra("VideoUri", filmGet.getOutput().getData().getFilmTrailer());
startActivity(intent);

If it helps, I launch SecondActivity from a fragment.

Upvotes: 2

Views: 2041

Answers (1)

A. Badakhshan
A. Badakhshan

Reputation: 1043

So, after reading @sharan comment and some googling, it made me to read some google documents. According to docs, there isn't any difference between android:launchMode=singleInstance and android:launchMode=singleTask but one. They both make your activity singleton and so you will never have two instances of it. The only difference between them is that singleInstance will prevent the task from attaching any other activity while singleTask has not this limitation. Any other things about them are the same.

So, for anyone who is reading this post, I'll recommend you to never use singleInstance launch mode unless you exactly need what it has. Because if you have only one activity in your app, then there will be no differences between singleInstance and singleTask. And if you have more than one activity, then I'll recommend you to all of your activities belong to one task.

In short, change singleInstance to singleTask and you are go.

Upvotes: 5

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