public final IntentIntegrator setPrompt(String prompt) {
        if (prompt != null) {
            addExtra(Intents.Scan.PROMPT_MESSAGE, prompt);
        }
        return this;
    }
Set a prompt to display on the capture screen, instead of using the default.

@param prompt the prompt to display
zxing-android-embedded/src/com/google/zxing/integration/android/IntentIntegrator.java