How to finish an activity from other activity in android

FIRST WAY
In your first activity, declare one Activity object like this,

public static Activity fa;
onCreate()
{
    fa = this;
}

now use that object in another Activity to finish first-activity like this,

onCreate()
{
    FirstActivity.fa.finish();
}

SECOND WAY
From View
Write below code after startactivity(intent) for finish the activity from the view/class.

((Activity_Name1) context).finish();