How to ask for multiple permission in android at once. I m using below code but it is asking one permission at once, and when I close the app and relaunch it then it asks for next permission. How to get rid of this prob,,,,,,, any help 

Thanx in advance
Happy Coding :)
What I have tried:

 

final int PERMISSION_ALL = 1;
final String[] PERMISSIONS = {Manifest.permission.READ_CONTACTS, Manifest.permission.WRITE_CONTACTS, Manifest.permission.READ_SMS,Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.CAMERA};

if(!hasPermissions(this, PERMISSIONS))
{
ActivityCompat.requestPermissions(this, PERMISSIONS, PERMISSION_ALL);
}


public static boolean hasPermissions(Context context, String... permissions)
{
if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && context != null && permissions != null) {
for (String permission: permissions) {
if (ActivityCompat.checkSelfPermission(context, permission) != PackageManager.PERMISSION_GRANTED) {
return false;
}
}
}
return true;
}