[Code] Android uses criteria to select a suitable geographic location service

Locationactivity. Java

/* Locationactivity. java * @ author octobershiner * 2011 7 24 * se. hit * uses criteria to select the optimal location service to demonstrate the code for locating a user's location and listening for location changes **/package uni. location; import android. app. activity; import android. content. context; import android. location. criteria; import android. location. location; import android. location. locationlistener; import android. location. locationmanager; import android. OS. bundle; import android. OS. vibrator; impor T android. util. log; import android. widget. textview; public class locationactivity extends activity {/** called when the activity is first created. * // create the lcoationmanager object private locationmanager; Private Static final string tag = "location Demo"; @ override public void oncreate (bundle savedinstancestate) {super. oncreate (savedinstancestate); setcontentview (R. layout. main); // obtain the system service, Manager = (Locationmanager) getsystemservice (context. location_service); // create a criteria object Criteria = new criteria (); criteria. setaccuracy (criteria. accuracy_coarse); // you do not need to obtain the altitude data criteria. setaltituderequired (false); criteria. setbearingrequired (false); // you can set the criteria. setcostallowed (true); // criteria requires low power consumption. setpowerrequirement (criteria. power_low); string provider = manager. getbestprovider (CRIT Eria, false); log. I (TAG, "we choose" + provider); location = manager. getlastknownlocation (provider); // obtain the device location updatelocation (location) for the first time; // an important function that listens to the data test Manager. requestlocationupdates (provider, 6000, 10, locationlistener);} // create an event listener private final locationlistener = new locationlistener () {public void onlocationchanged (location) {updatelocation (location );} Public void onproviderdisabled (string provider) {updatelocation (null); log. I (TAG, "provider now is disabled .. ");} public void onproviderenabled (string provider) {log. I (TAG, "provider now is enabled .. ");} public void onstatuschanged (string provider, int status, bundle extras) {}; // gets the user location function and displays private void updatelocation (location) using log) {string latlng; If (location! = NULL) {double lat = location. getlatitude (); double lng = location. getlongpolling (); latlng = "latitude:" + lat + "longpolling:" + LNG;} else {latlng = "can't access your location";} log. I (TAG, "the location has changed .. "); log. I (TAG, "Your location:" + latlng );}}

Modify the manifest. xml file at the same time

    <?xml version="1.0" encoding="utf-8"?>      <manifest xmlns:android="http://schemas.android.com/apk/res/android"            package="uni.location"            android:versionCode="1"            android:versionName="1.0">          <uses-sdk android:minSdkVersion="8" />                <application android:icon="@drawable/icon" android:label="@string/app_name">              <activity android:name=".LocationActivity"                        android:label="@string/app_name">                  <intent-filter>                      <action android:name="android.intent.action.MAIN" />                      <category android:name="android.intent.category.LAUNCHER" />                  </intent-filter>              </activity>                </application>              <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />       </manifest>  

Demo result:

We can see that we only require low accuracy and the lowest power. From the last line, we can see that my VM network service is not enabled, but when we select the best provider, if the parameter is set to false, you can also select the parameter.