Android app for Hunters

Hi. Im making an app for Hunters in Denmark. The app will contain 5-7 different activities. 3 of them is kind of tricky. I need a listview containing 100-200 items. Each item does have a gps coordination, and the list need to show the item closest to the user at top. Then i need a activity containing a textview where the user can write a text and save it within the app (like a diary). The last major feature is a weather forecast that can show the weather for a week. The remaining activities just need to handle some simple text. I do already have some codes that can be used. Thanks