android开发

开发平台：
Java

LocationTest.java：源码内容
							/***
 * Excerpted from "Hello, Android!",
 * published by The Pragmatic Bookshelf.
 * Copyrights apply to this code. It may not be used to create training material, 
 * courses, books, articles, and the like. Contact us if you are in doubt.
 * We make no guarantees that this code is fit for any purpose. 
 * Visit http://www.pragmaticprogrammer.com/titles/eband for more book information.
***/
package org.example.locationtest;
import java.util.List;
import android.app.Activity;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.location.LocationProvider;
import android.os.Bundle;
import android.widget.TextView;
public class LocationTest extends Activity implements
      LocationListener { 
   
   private static final String[] A = { "n/a", "fine", "coarse" };
   private static final String[] P = { "n/a", "low", "medium",
         "high" };
   private static final String[] S = { "out of service",
         "temporarily unavailable", "available" };
   
   private LocationManager mgr;
   private TextView output;
   private String best;
   @Override
   public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);
      mgr = (LocationManager) getSystemService(LOCATION_SERVICE); 
      output = (TextView) findViewById(R.id.output);
      log("Location providers:");
      dumpProviders(); 
      Criteria criteria = new Criteria(); 
      best = mgr.getBestProvider(criteria, true);
      log("nBest provider is: " + best);
      log("nLocations (starting with last known):");
      Location location = mgr.getLastKnownLocation(best); 
      dumpLocation(location);
   }
   
   
   @Override
   protected void onResume() {
      super.onResume();
      // Start updates (doc recommends delay >= 60000 ms)
      mgr.requestLocationUpdates(best, 15000, 1, this);
   }
   @Override
   protected void onPause() {
      super.onPause();
      // Stop updates to save power while app paused
      mgr.removeUpdates(this);
   }
   
   
   public void onLocationChanged(Location location) {
      dumpLocation(location);
   }
   public void onProviderDisabled(String provider) {
      log("nProvider disabled: " + provider);
   }
   public void onProviderEnabled(String provider) {
      log("nProvider enabled: " + provider);
   }
   public void onStatusChanged(String provider, int status,
         Bundle extras) {
      log("nProvider status changed: " + provider + ", status="
            + S[status] + ", extras=" + extras);
   }
   
   private void log(String string) {
      output.append(string + "n");
   }
   private void dumpProviders() {
      List<String> providers = mgr.getAllProviders();
      for (String provider : providers) {
         dumpProvider(provider);
      }
   }
   private void dumpProvider(String provider) {
      LocationProvider info = mgr.getProvider(provider);
      StringBuilder builder = new StringBuilder();
      builder.append("LocationProvider[")
            .append("name=")
            .append(info.getName())
            .append(",enabled=")
            .append(mgr.isProviderEnabled(provider))
            .append(",getAccuracy=")
            .append(A[info.getAccuracy()])
            .append(",getPowerRequirement=")
            .append(P[info.getPowerRequirement()])
            .append(",hasMonetaryCost=")
            .append(info.hasMonetaryCost())
            .append(",requiresCell=")
            .append(info.requiresCell())
            .append(",requiresNetwork=")
            .append(info.requiresNetwork())
            .append(",requiresSatellite=")
            .append(info.requiresSatellite())
            .append(",supportsAltitude=")
            .append(info.supportsAltitude())
            .append(",supportsBearing=")
            .append(info.supportsBearing())
            .append(",supportsSpeed=")
            .append(info.supportsSpeed())
            .append("]");
      log(builder.toString());
   }
   private void dumpLocation(Location location) {
      if (location == null)
         log("nLocation[unknown]");
      else
         log("n" + location.toString());
   }
   
}

						