CODEWITHSUNDEEP
androidbackgroundmobile-application
Zhang Zhan
Zhang Zhan

Reputation: 905

How to bring Android activity to the front without bringing app to front if it is running in background?

I have an app that may run in the background. While it is running, it may bring a certain activity to the front. However, when the app brings the activity to the front, if the app is currently running at background, I do not want Android to bring the app itself to the front, just do it at background. The reason being is I do not want my app to interrupt what the customer is doing at the moment.

The following is my code that launches the activity.

Intent intentLogin = new Intent(getApplicationContext(), LoginActivity.class);
intentLogin.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK|Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intentLogin);

The issue with the above code is every time when it is called, it always bring my app to the front even the app is running at background, that is, annoy my customer.

My question is, is there a way that I can quietly bring the activity to the front? If my app is running in front, thats great --- the customer see the new activity straight away. If my app is running at background, I want to quietly bring the activity to the front when app is running in background, and next time when my customer resume the app, they will see the new activity I brought forward.

How can I do that?

Thank you very much!

Upvotes: 0

Views: 1694

Answers (2)

Elias Fazel
Elias Fazel

Reputation: 2113

If understand correctly, I suggest this: User leaves your app, and when user come back to your app you want to show another activity instead of .MainActivity define another activity as Main and with NoDisplay theme.

<activity
android:name=".MainActivity"
android:theme="@android:style/Theme.NoDisplay">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>

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

then define your normal activities. In MainActivity class define a static variable. for example

public static boolean appRun = false;

onCreate() of SecondActivity change its value to true.

class SecondActivity extends Activity{
@Override
protected void onCreate(Bundle Saved){
super.onCreate(Saved);
MainActivity.appRun = true;
}
}

and onPause set this.finish(); to avoid not resuming to SecondActivity and force to start from MainActivity. then onCreate() or onResume() of MainActivity check it s value and navigate to another activity.

  if(appRun == true){
    /*it means user went to SecondActivity and you want to display another*/
    startActivity(new Intent(context, NewActivity.class));
    }
else{
//this is first time so navigate to SecondActivity
}

Also If you can use Fragments this solution can work for that too.

Upvotes: 0

xiaoyuan
xiaoyuan

Reputation: 423

如果我没理解错的话：

  • App background and usual player.

When user logged out , you can clear the user data saved in local and show a notification.And when the notification is clicked, start LoginActivity.

  • App background and unusual player.

When the notification shows ,the user do not click it instead of run the app.You can check the user data whether existing or not by onResume()in BaseActivity.If not ,start LoginActivity.

  • App foreground.

clear user data and force to start LoginActivity.

If you don't like the solution above(the best user experence I think),try this:

  • In onCreate() in the specific Activity ,use moveTaskToBack(true) to hide the intent.But remember to check whether the app is running background or foreground.you can refer to this.

Upvotes: 1

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