Android GPS application: dynamically obtains Location Information

This article introduces the concept of GPS and common classes and methods involved in GPS application development in Android. In this article, a small application is developed to obtain positioning information in real time, including the user's latitude, longitude, height, direction, and moving speed. The Code is as follows: Activity: [java] package comhome. location; import android. app. activity; import android. content. context; import android. location. location; import android. location. locationListener; import android. location. locationManager; import android. OS. bundle; import android. widget. editText; public class LocationTestActivity extends Activity {// defines the LocationManager object private LocationManager locationManager; Private EditText show; @ Override protected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. main); show = (EditText) findViewById (R. id. main_et_show); // obtain the system LocationManager service locationManager = (LocationManager) getSystemService (Context. LOCATION_SERVICE); // obtain the latest Location information from GPS. location Location = locationManager. getLastKnownLocation (LocationManager. GPS_PROVIDER); // display the location information in the location in the EditText updateView (location); // set the location manager to get the GPS location information every 2 seconds. requestLocationUpdates (LocationManager. GPS_PROVIDER, 2000, 8, new LocationListener () {@ Override public void onLocationChanged (Location location) {// update the location updateView (Location) when the GPS location information changes );} @ Override public void onProviderDisabled (String provider) {updateView (null) ;}@ Override public voi D onProviderEnabled (String provider) {// when the GPS LocationProvider is available, update the location updateView (locationManager. getLastKnownLocation (provider);} @ Override public void onStatusChanged (String provider, int status, Bundle extras) {}});} private void updateView (Location location) {if (Location! = Null) {StringBuffer sb = new StringBuffer (); sb. append ("real-time location information: \ n longitude:"); sb. append (location. getlongpolling (); sb. append ("\ n latitude:"); sb. append (location. getLatitude (); sb. append ("\ n Height:"); sb. append (location. getAltitude (); sb. append ("\ n speed:"); sb. append (location. getSpeed (); sb. append ("\ n Direction:"); sb. append (location. getBearing (); sb. append ("\ n precision:"); sb. append (location. getAccuracy (); show. setText (sb. to String ();} else {// clear EditText show if the input Location object is empty. setText ("") ;}} package comhome. location; import android. app. activity; import android. content. context; import android. location. location; import android. location. locationListener; import android. location. locationManager; import android. OS. bundle; import android. widget. editText; public class LocationTestActivity extends Activity {// define LocationMan Manager object private LocationManager locationManager; private EditText show; @ Overrideprotected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. main); show = (EditText) findViewById (R. id. main_et_show); // obtain the system LocationManager service locationManager = (LocationManager) getSystemService (Context. LOCATION_SERVICE); // obtain the latest Location information from GPS. location Location = locationManager. GetLastKnownLocation (LocationManager. GPS_PROVIDER); // display the location information in the location in the EditText updateView (location); // set the location manager to get the GPS location information every 2 seconds. requestLocationUpdates (LocationManager. GPS_PROVIDER, 2000, 8, new LocationListener () {@ Overridepublic void onLocationChanged (Location location) {// update the location updateView (Location) when the GPS location information changes );} @ Overridepublic void onProviderDisabled (String provider) {updateView (null) ;}@ Overridepublic void onProviderEnabled (String provider) {// when the GPS LocationProvider is available, update the location updateView (locationManager. getLastKnownLocation (provider);} @ Overridepublic void onStatusChanged (String provider, int status, Bundle extras) {}});} private void updateView (Location location) {if (Location! = Null) {StringBuffer sb = new StringBuffer (); sb. append ("real-time location information: \ n longitude:"); sb. append (location. getlongpolling (); sb. append ("\ n latitude:"); sb. append (location. getLatitude (); sb. append ("\ n Height:"); sb. append (location. getAltitude (); sb. append ("\ n speed:"); sb. append (location. getSpeed (); sb. append ("\ n Direction:"); sb. append (location. getBearing (); sb. append ("\ n precision:"); sb. append (location. getAccuracy (); show. setText (sb. toString ();} else {// clear EditTextshow if the input Location object is empty. setText ("") ;}} layout XML: [html] <LinearLayout xmlns: android = "http://schemas.android.com/apk/res/android" android: layout_width = "match_parent" android: layout_height = "match_parent"> <EditText android: id = "@ + id/main_et_show" android: layout_width = "match_parent" android: layout_height = "match_parent" android: cursorVisible = "false" android: editable = "false"/> </LinearLayout> <LinearLayout xmlns: android = "http://schemas.android.com/apk/res/android" android: layout_width = "match_parent" android: layout_height = "match_parent"> <EditText android: id = "@ + id/main_et_show" android: layout_width = "match_parent" android: layout_height = "match_parent" android: cursorVisible = "false" android: editable = "false"/> </LinearLayout> permission: [html] <uses-permission android: name = "android. permission. ACCESS_FINE_LOCATION "/> <uses-permission android: name =" android. permission. ACCESS_FINE_LOCATION "/> effect: