packages/apps/Settings/src/com/android/settings/deviceinfo/BuildNumberPreferenceController.java

private void enableDevelopmentSettings() {
++        if (true){
++            return;
++        }else{
            mDevHitCountdown = 0;
            mProcessingLastDevHit = false;
            DevelopmentSettingsEnabler.setDevelopmentSettingsEnabled(mContext, true);
            if (mDevHitToast != null) {
                mDevHitToast.cancel();
            }
            mDevHitToast = Toast.makeText(mContext, R.string.show_dev_on,
                    Toast.LENGTH_LONG);
            mDevHitToast.show();
++        }
    }

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