Location service and LocationManager : Location « Hardware « Android

1. Android
2. Hardware
3. Location

Location service and LocationManager

 

package app.Test;

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 appTest 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:");
    List<String> providers = mgr.getAllProviders();
    for (String provider : providers) {
      dumpProvider(provider);
    }

    Criteria criteria = new Criteria();
    best = mgr.getBestProvider(criteria, true);
    log("\nBest provider is: " + best);

    Location location = mgr.getLastKnownLocation(best);
    dumpLocation(location);
  }
  @Override
  protected void onResume() {
    super.onResume();
    mgr.requestLocationUpdates(best, 15000, 1, this);
  }
  @Override
  protected void onPause() {
    super.onPause();
    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 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());
  }

}

//main.xml

<?xml version="1.0" encoding="utf-8"?>
<ScrollView
   xmlns:android="http://schemas.android.com/apk/res/android"
   android:orientation="vertical"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent">
   <TextView
      android:id="@+id/output"
      android:layout_width="fill_parent"
      android:layout_height="wrap_content" />
</ScrollView>

   
  

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