You need to prevent the device-specific tilting exception
Which code segment should you insert at line PL16?
You need to handle the location-detection problem
Which object should you use?
Which code segment should you insert at line BG05?
Which code segment should you insert at line BG14?
You need to resolve the issue of unavailable obstacle data
Which action should the app perform when the user touches a button?
Which code segment should you insert at line L032?
Which code segment should you insert at line PL21?