Android Marshmallow permissions?

I want to show permission prompt where user can accept the access of that permission,Like i want to access users contacts so i want to show prompt with two option allow and deny any example and source code.

do like this

private void PerrmissionWork() {

    List<String> permissionsNeeded = new ArrayList<String>();

    final List<String> permissionsList = new ArrayList<String>();
    if (!addPermission(permissionsList,
            Manifest.permission.ACCESS_FINE_LOCATION))
        permissionsNeeded.add("GPS");
    if (!addPermission(permissionsList,
            Manifest.permission.ACCESS_COARSE_LOCATION))
        permissionsNeeded.add("GPS COARSE");


    if (permissionsList.size() > 0) {
        if (permissionsNeeded.size() > 0) {
            // Need Rationale
            String message = "You need to grant access to "
                    + permissionsNeeded.get(0);
            for (int i = 1; i < permissionsNeeded.size(); i++)
                message = message + ", " + permissionsNeeded.get(i);
            showMessageOKCancel(message,
                    new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog,
                                int which) {
                            requestPermissions(permissionsList
                                    .toArray(new String[permissionsList
                                            .size()]),
                                    REQUEST_CODE_ASK_MULTIPLE_PERMISSIONS);
                        }
                    });
            return;
        }
        requestPermissions(
                permissionsList.toArray(new String[permissionsList.size()]),
                REQUEST_CODE_ASK_MULTIPLE_PERMISSIONS);
        return;
    }
    splashMainWork();
}

// mapWork();

private boolean addPermission(List<String> permissionsList,
        String permission) {
    if (checkSelfPermission(permission) != PackageManager.PERMISSION_GRANTED) {
        permissionsList.add(permission);
        // Check for Rationale Option
        if (!shouldShowRequestPermissionRationale(permission))
            return false;
    }
    return true;
}

private void showMessageOKCancel(String message,
        android.content.DialogInterface.OnClickListener onClickListener) {
    new AlertDialog.Builder(context).setMessage(message)
            .setPositiveButton("OK", onClickListener).setCancelable(false)
            .setNegativeButton("Cancel", null).create().show();

}

@Override
public void onRequestPermissionsResult(int requestCode,
        String[] permissions, int[] grantResults) {
    switch (requestCode) {
    case REQUEST_CODE_ASK_MULTIPLE_PERMISSIONS: {
        Map<String, Integer> perms = new HashMap<String, Integer>();
        // Initial
        perms.put(Manifest.permission.ACCESS_FINE_LOCATION,
                PackageManager.PERMISSION_GRANTED);
        perms.put(Manifest.permission.ACCESS_COARSE_LOCATION,
                PackageManager.PERMISSION_GRANTED);

        // Fill with results
        for (int i = 0; i < permissions.length; i++)
            perms.put(permissions[i], grantResults[i]);
        // Check for ACCESS_FINE_LOCATION
        if (perms.get(Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED
                && perms.get(Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED
                ) {
            // All Permissions Granted
            splashMainWork();
        } else {
            // Permission Denied
            Toast.makeText(context, "Some Permission is Denied",
                    Toast.LENGTH_SHORT).show();
        }
    }
        break;
    default:
        super.onRequestPermissionsResult(requestCode, permissions,
                grantResults);
    }
}

and call this method in on create like this..

    if (Build.VERSION.SDK_INT >= 23) {
        PerrmissionWork();
    } else {
       splashMainWork();
    }

i am getting location in splash work method and using location permission you can use contact permisssion and in place of splash work do your contact code.. and there are lots of demo also available try google they can give you good explanations.. and there is very good explanation on developer sit too.
here ..Try this blog very helpful