Google maps and GPS, camera, SD card, tips & tricks
0 likes784 views
This document provides information on using Google Maps, GPS, camera, and SD card functionality in Android applications. It discusses setting up a Maps API key, controlling map views, displaying the user's location, taking photos via intents and the camera API, permissions for hardware access, and reading/writing to the SD card. Tips are also provided such as using version control, testing on low-end devices, and using developer tools.
Google maps and GPS, camera, SD card, tips & tricks
- 1. Google maps + GPS, camera, SD card Nikola Kapraljević Infinum Ltd.
- 2. About me twitter@nixa [email protected] Android Ruby on Rails iPhone
- 3. About Infinum Ltd. www.infinumdigital.com Mobile and web development company 10 people Offices in Ljubljana and Zagreb
- 4. Google Maps API + GPS
- 5. Google APIs Add-On be careful when testing examples you’ll need emulator with “Google APIs” maps don’t work offline
- 6. New project ... Google APIs not Android x.x
- 7. Maps API key register for Maps API key http://code.google.com/android/maps-api-signup.html nixa-macbook:~ nixa$ keytool -list -keystore .android/ debug.keystore Enter keystore password: android Your keystore contains 1 entry Certificate fingerprint (MD5): 43:9D:9B: 48:83:27:69:02:21:61:78:A7:F5:01:7D:F7
- 8. Maps API key place api key in something like prefs.xml production/development keys are different
- 10. MapActivity
- 12. Controlling MapView shows map MapController controls the map MapController controller = map.getController() controller.setZoom(10) controller.setCenter(GeoPoint gp) controller.animateTo(GeoPoint gp)
- 13. MyLocationOverlay myLocationOverlay = new MyLocationOverlay(this, map); myLocationOverlay.runOnFirstFix(Runnable r) myLocationOverlay.enableMyLocation() myLocationOverlay.disableMyLocation()
- 14. CustomLocationOverlay extend MyLocationOverlay for custom POI icon
- 15. POIs on MapView MyPOIOverlay extends ItemizedOverlay<OverlayItem> similar to ArrayAdapter override protected OverlayItem createItem(int i) public int size() boundCenterBottom(Drawable) keep local copy of data in overlay in case you need to show some info for POI
- 17. GPS ... and why I hate GPS
- 18. Permissions First you’ll need permissions INTERNET ACCESS_FINE_LOCATION ACCESS_COARSE_LOCATION Sometimes users complain about FINE_LOCATION. Use only if you really need it.
- 19. LocationManager Context.getSystemService(Context.LOCATION_SERVICE) GPS_PROVIDER NETWORK_PROVIDER (cell tower and Wi-Fi based location) locationManager.requestLocationUpdates(LocationManag er.NETWORK_PROVIDER, time, distance, locationListener);
- 20. LocationListener void onLocationChanged(Location location) void onProviderDisabled(String provider) void onProviderEnabled(String provider) void onStatusChanged(String provider, int status, Bundle extras)
- 21. GPS testing Emulator telnet localhost 555x geo fix 45.0 22.0 Device My Fake Location com.my.fake.location Applications -> Development -> Allow mock locations
- 22. GPS more info http://developer.android.com/guide/topics/location/ obtaining-user-location.html http://stackoverflow.com/questions/3145089/what-is- the-simplest-and-most-robust-way-to-get-the-users- current-location-in-a/3145655#3145655 we use this in most of our applications
- 23. Camera
- 24. Permissions <uses-permission android:name="android.permission.CAMERA" /> <uses-feature android:name="android.hardware.camera" /> <uses-feature android:name="android.hardware.camera.autofocus" android:required="false" />
- 25. Camera via Intent Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); //extra to save full-image somewhere intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(destination)); destination = new File(Environment.getExternalFilesDir(null),"image.jpg");
- 26. Camera via SurfaceHolder for creating camera applications etc... in 99% cases you don’t need this http://developer.android.com/reference/android/ hardware/Camera.html
- 27. Crop doesn’t work on all devices!
- 28. Crop intent.putExtra("crop", "true"); intent.putExtra("aspectX", 1); intent.putExtra("aspectY", 1); intent.putExtra("outputX", 116); intent.putExtra("outputY", 116); intent.putExtra("return-data", true); Bitmap userImage = (Bitmap) data.getExtras().get("data");
- 29. SD card
- 30. SD card <uses-permission android:name="android.permission.WRITE_EXTERNAL _STORAGE" /> Include an empty file named .nomedia in your external files directory (note the dot prefix in the filename). This will prevent Android's media scanner from reading your media files and including them in apps like Gallery or Music.
- 31. SD card Check for presence and availability before using SD String state = Environment.getExternalStorageState(); MEDIA_MOUNTED MEDIA_MOUNTED_READ_ONLY
- 32. External folders File getExternalStoragePublicDirectory (String type) DIRECTORY_MUSIC, DIRECTORY_PODCASTS, DIRECTORY_RINGTONES, DIRECTORY_ALARMS, DIRECTORY_NOTIFICATIONS, DIRECTORY_PICTURES, or DIRECTORY_MOVIES gets scanned by media scanner files aren’t deletes on app uninstall File getExternalFilesDir (String type) doesn’t get scanned by media scanner files are deleted on app uninstall
- 33. App 2 SDcard <manifest xmlns:android="http:// schemas.android.com/apk/res/android" android:installLocation="preferExternal" ... > use location “auto”
- 34. Tips & tricks
- 36. Emulator sucks.
- 37. Google Analytics also suck. Use Flurry.
- 39. Once again, use version control!
- 40. Use drawable selectors. different images for normal and pressed state
- 41. Test on crapy devices.
- 42. Threads are you friends. runOnUiThread, Handler
- 43. Check out Fragments. They’re cool!
- 45. Standardise your res/* naming convention
- 46. Designing app for landscape mode is 2x the work.
- 47. Use Dev Tools ICS devices
- 49. Pitanja ...
Editor's Notes
- #2: \n
- #3: \n
- #4: \n
- #5: \n
- #6: \n
- #7: \n
- #8: \n
- #9: \n
- #10: \n
- #11: \n
- #12: \n
- #13: \n
- #14: \n
- #15: \n
- #16: \n
- #17: \n
- #18: \n
- #19: \n
- #20: \n
- #21: \n
- #22: \n
- #23: \n
- #24: \n
- #25: \n
- #26: \n
- #27: \n
- #28: \n
- #29: \n
- #30: \n
- #31: \n
- #32: \n
- #33: \n
- #34: \n
- #35: \n
- #36: \n
- #37: \n
- #38: \n
- #39: \n
- #40: \n
- #41: \n
- #42: \n
- #43: \n
- #44: \n
- #45: \n
- #46: \n
- #47: \n
- #48: \n
- #49: \n
- #50: \n