Bringing the activity to foreground switch the activity to the foreground

I have encountered this problem for a long time. Some solutions on the Internet are incomplete. This record is specially made:

The following method cannot be used to switch the activity running in the background to the foreground!

1 Intent i = new Intent();2 i.setClass(this, MainActivity.class);3 i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);4 startActivity(i);

You must replace I with getapplicationcontext () to run mainactivity. However, instead of switching the mainactivity running in the background to the foreground, a new task is created to run mainactivity.

The following code must be used:

1 Intent start = new Intent(getApplicationContext(),MainActivity.class); 2 start.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);3 startActivity(start); 

In addition, the following red font configurations are required for the corresponding mainactivity.

<activityandroid:name=".MainActivity"android:label="@string/app_name" android:launchMode="singleTop">

In order to re-sort the mainactivity running in the background to run in the foreground.

 

Bringing the activity to foreground switch the activity to the foreground