simple way to make a Share Button in Android App Android Studio
Code :
Intent MyIntent= new Intent(Intent.ACTION_SEND);
MyIntent.setType("text/plain");
String sharBody=" ";
String sharSub="";
MyIntent.putExtra(Intent.EXTRA_SUBJECT,sharBody);
MyIntent.putExtra(Intent.EXTRA_TEXT,sharSub);
startActivity(Intent.createChooser(MyIntent,"Your text "));