@Override public boolean checkAndInitializeSdk( @NonNull Activity launcherActivity, @NonNull Map<String, Object> localExtras, @NonNull Map<String, String> serverExtras) throws Exception { synchronized (ChartboostRewardedVideo.class) { if (sInitialized) { return false; } if (!serverExtras.containsKey(APP_ID_KEY)) { throw new IllegalStateException( "Chartboost rewarded video initialization" + " failed due to missing application ID."); } if (!serverExtras.containsKey(APP_SIGNATURE_KEY)) { throw new IllegalStateException( "Chartboost rewarded video initialization" + " failed due to missing application signature."); } final String appId = serverExtras.get(APP_ID_KEY); final String appSignature = serverExtras.get(APP_SIGNATURE_KEY); Chartboost.startWithAppId(launcherActivity, appId, appSignature); Chartboost.setDelegate(sSingletonChartboostDelegate); sInitialized = true; return true; } }