LocationAddress/app/src/main/java/com/google/android/gms/location/sample/locationaddress/MainActivity.java [340:370]:
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    private void requestPermissions() {
        boolean shouldProvideRationale =
                ActivityCompat.shouldShowRequestPermissionRationale(this,
                        Manifest.permission.ACCESS_FINE_LOCATION);

        // Provide an additional rationale to the user. This would happen if the user denied the
        // request previously, but didn't check the "Don't ask again" checkbox.
        if (shouldProvideRationale) {
            Log.i(TAG, "Displaying permission rationale to provide additional context.");

            showSnackbar(R.string.permission_rationale, android.R.string.ok,
                    new View.OnClickListener() {
                        @Override
                        public void onClick(View view) {
                            // Request permission
                            ActivityCompat.requestPermissions(MainActivity.this,
                                    new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
                                    REQUEST_PERMISSIONS_REQUEST_CODE);
                        }
                    });

        } else {
            Log.i(TAG, "Requesting permission");
            // Request permission. It's possible this can be auto answered if device policy
            // sets the permission in a given state or the user denied the permission
            // previously and checked "Never ask again".
            ActivityCompat.requestPermissions(MainActivity.this,
                    new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
                    REQUEST_PERMISSIONS_REQUEST_CODE);
        }
    }
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Geofencing/app/src/main/java/com/google/android/gms/location/sample/geofencing/MainActivity.java [356:384]:
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    private void requestPermissions() {
        boolean shouldProvideRationale =
                ActivityCompat.shouldShowRequestPermissionRationale(this,
                        Manifest.permission.ACCESS_FINE_LOCATION);

        // Provide an additional rationale to the user. This would happen if the user denied the
        // request previously, but didn't check the "Don't ask again" checkbox.
        if (shouldProvideRationale) {
            Log.i(TAG, "Displaying permission rationale to provide additional context.");
            showSnackbar(R.string.permission_rationale, android.R.string.ok,
                    new View.OnClickListener() {
                        @Override
                        public void onClick(View view) {
                            // Request permission
                            ActivityCompat.requestPermissions(MainActivity.this,
                                    new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
                                    REQUEST_PERMISSIONS_REQUEST_CODE);
                        }
                    });
        } else {
            Log.i(TAG, "Requesting permission");
            // Request permission. It's possible this can be auto answered if device policy
            // sets the permission in a given state or the user denied the permission
            // previously and checked "Never ask again".
            ActivityCompat.requestPermissions(MainActivity.this,
                    new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
                    REQUEST_PERMISSIONS_REQUEST_CODE);
        }
    }
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