Android LocationManager获取经度与纬度等地理信息
利用LocationManager实现定位功能
1 实时更新经度,纬度
2 根据经度和纬度获取地理信息(比如:国家,街道等)(略过)
MainActivity如下:
package cc.bb;
import java.util.Iterator;
import java.util.List;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.widget.TextView;
import android.app.Activity;
import android.content.Context;
public class MainActivity extends Activity {
private Context mContext;
private TextView mTextView;
private LocationManager mLocationManager;
private LocationListenerImpl mLocationListenerImpl;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
init();
initLocationManager(mContext);
}
private void init(){
mContext=this;
mTextView=(TextView) findViewById(R.id.textView);
}
private void initLocationManager(Context context){
mLocationManager=(LocationManager)context.getSystemService(Context.LOCATION_SERVICE);
//获取可用的位置信息Provider.即passive,network,gps中的一个或几个
List providerList=mLocationManager.getProviders(true);
for (Iterator iterator = providerList.iterator(); iterator.hasNext();) {
String provider = (String) iterator.next();
System.out.println("provider="+provider);
}
//在此采用GPS的方式获取位置信息
String GPSProvider=LocationManager.GPS_PROVIDER;
Location location=mLocationManager.getLastKnownLocation(GPSProvider);
if (location!=null) {
double longitude=location.getLongitude();
double altitude=location.getAltitude();
System.out.println("longitude="+longitude+",altitude="+altitude);
} else {
System.out.println("location==null");
}
//注册位置监听
mLocationListenerImpl=new LocationListenerImpl();
mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 3000, 5, mLocationListenerImpl);
}
private class LocationListenerImpl implements LocationListener{
//当设备位置发生变化时调用该方法
@Override
public void onLocationChanged(Location location) {
if (location!=null) {
showLocation(location);
}
}
//当provider的状态发生变化时调用该方法.比如GPS从可用变为不可用.
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
//当provider被打开的瞬间调用该方法.比如用户打开GPS
@Override
public void onProviderEnabled(String provider) {
}
//当provider被关闭的瞬间调用该方法.比如关闭打开GPS
@Override
public void onProviderDisabled(String provider) {
}
}
private void showLocation(Location location) {
// 获取经度
double longitude = location.getLongitude();
// 获取纬度
double altitude = location.getAltitude();
String message="经度为:"+longitude+"n"+"纬度为:"+altitude;
mTextView.setText(message);
}
@Override
protected void onDestroy() {
super.onDestroy();
if (mLocationManager!=null) {
mLocationManager.removeUpdates(mLocationListenerImpl);
}
}
}
main.xml如下:
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