How to make a phone call button in Android for Marshmallow -


i'm trying create calling button in android. created 1 , works in kind of android device it's not working on marshmallow. don't know why. how create calling button android marshmallow?

this code used calling button : 

public void button(view v) {          string number = "12354656";         intent intent = new intent(intent.action_call);         intent.setdata(uri.parse("tel:" + number));           if (activitycompat.checkselfpermission(this, android.manifest.permission.call_phone) != packagemanager.permission_granted) {              return;         }         startactivity(intent);  }

you'll need enable permission app in phone settings. under permissions in settings


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