在上文中，介绍了GPS概念及Android开发GPS应用涉及到的常用类和方法。在本文中，开发一个小应用，实时获取定位信息，包括用户所在的纬度、经度、高度、方向、移动速度等。代码如下：
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 {
// 定义LocationManager对象
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);
// 获取系统LocationManager服务
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
// 从GPS获取最近的定位信息
Location location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
// 将location里的位置信息显示在EditText中
updateView(location);
// 设置每2秒获取一次GPS的定位信息
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,
2000, 8, new LocationListener() {
@Override
public void onLocationChanged(Location location) {
// 当GPS定位信息发生改变时，更新位置
updateView(location);
}
@Override
public void onProviderDisabled(String provider) {
updateView(null);
}
@Override
public void onProviderEnabled(String provider) {
// 当GPS LocationProvider可用时，更新位置
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("实时的位置信息：\n经度：");
sb.append(location.getLongitude());
sb.append("\n纬度：");
sb.append(location.getLatitude());
sb.append("\n高度：");
sb.append(location.getAltitude());
sb.append("\n速度：");
sb.append(location.getSpeed());
sb.append("\n方向：");
sb.append(location.getBearing());
sb.append("\n精度：");
sb.append(location.getAccuracy());
show.setText(sb.toString());
} else {
// 如果传入的Location对象为空则清空EditText
show.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 {
// 定义LocationManager对象
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);
// 获取系统LocationManager服务
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
// 从GPS获取最近的定位信息
Location location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
// 将location里的位置信息显示在EditText中
updateView(location);
// 设置每2秒获取一次GPS的定位信息
