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;

 /*

  * 实时获取GPS定位数据

  */

 public class LocationActivity extends Activity

 {

     LocationManager mLocationManager;

     EditText mEditText;

     @Override

     public void onCreate(Bundle savedInstanceState)

     {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.main);

         mEditText = (EditText)findViewById(R.id.show);

         mLocationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);

         //从 GPS_PROVIDER 获取最后已知的定位信息

         Location location = mLocationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);

         //在editview中显示该信息

         updateView(location);

         /*

          * 请求更新 location

          */

         //2000表示更新周期是2秒,8表示当新位置与当前位置超过8米时

         //2000与8米是或的关系.其中一个满足时就触发LocationListener回调

         mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, , , new LocationListener() {

             @Override

             public void onStatusChanged(String provider, int status, Bundle extras) {

             }

             @Override

             public void onProviderEnabled(String provider) {

                 //当PorviderLocation可用时的回调

                 updateView(mLocationManager.getLastKnownLocation(provider));

             }

             @Override

             public void onProviderDisabled(String provider) {

             }

             @Override

             public void onLocationChanged(Location location) {

                 //当gps位置信息变化时的回调

                 updateView(location);

             }

         });

     }    

     //在 EditView 中显示位置信息

     public void updateView(Location newLocation)

     {

         if(newLocation != null)

         {

             StringBuilder sb = new StringBuilder();

             sb.append("实时的位置信息:\n");

             sb.append("经度:" + newLocation.getLongitude() + "\n");

             sb.append("纬度:" + newLocation.getLatitude()  + "\n");

             sb.append("高度:" + newLocation.getAltitude()  + "\n");

             sb.append("速度:" + newLocation.getSpeed()     + "\n");

             sb.append("方向:" + newLocation.getBearing()   + "\n");

             mEditText.setText(sb.toString());

         }

     }

 }

 import android.app.Activity;

 import android.location.Location;

 import android.os.Bundle;

 import android.widget.EditText;

 /*

  * 求两个经纬点间距离

  */

 public class DistanceActivity extends Activity {

     private EditText mEditText;

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_distance);

         mEditText = (EditText) findViewById(R.id.edittext);

         // 1,准备一个存放计算结果的数组,长度为3,最终距离为数组第1个元素的值,

         final float[] results = new float[];

         // 2,用Location.distanceBetween静态方法计算,前两个参数为第一个点的经纬度,第3,4个参数是第2个点的经纬度,

         Location.distanceBetween(20.123, 30.05644, 30.124, 40.543, results);

         mEditText.setText(String.valueOf(results[]) + "米");

     }

 }

 import mobile.android.proximity.alert.R;

 import android.app.Activity;

 import android.app.PendingIntent;

 import android.content.Context;

 import android.content.Intent;

 import android.location.LocationManager;

 import android.os.Bundle;

 /*

  * 当进入目标区域时提示警告的示例

  * 目标区域是指 以某个经纬点为原点,半径为x的一个圆.

  */

 public class ProximityAlertActivity extends Activity{

     @Override

     public void onCreate(Bundle savedInstanceState){

         super.onCreate(savedInstanceState);

         setContentView(R.layout.main);    

         //进入目标区域提示警告 第1步,得到LocationManager

         LocationManager locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);

         //进入目标区域提示警告 第2步,准备目标区域

         double longitude = 123.427109;

         double latitude = 41.764998;

         float radius = ;//半径

         //进入目标区域提示警告 第3步,广播接收器的intent.PromimityAlertRecivery是个接收器.

         Intent intent = new Intent(this, PromimityAlertRecivery.class);

         //进入目标区域提示警告 第4步,将广播接收器与PendingIntent绑定.

         //PendingIntent 比intent生命周期长,应用关闭后,它仍然存在.除非卸载或关机.

         PendingIntent pendingIntent = PendingIntent.getBroadcast(this,,intent,);

         //进入目标区域提示警告 第5步,添加一个进入警告到LocationManager,其中-1这个参数是过期周期,-1表示永远

         locationManager.addProximityAlert(latitude, longitude, radius, -, pendingIntent);

     }

 }

 import android.content.Context;

 import android.content.Intent;

 import android.location.LocationManager;

 import android.widget.Toast;

 /*

  * 注意这是个广播接收器,还是主动请求的数据的

  */

 public class PromimityAlertRecivery {

     public void onReceive(Context context, Intent intent) {

         //是否进入目标区域,true是进入,false是离开

         boolean isEnter = intent.getBooleanExtra(

                 LocationManager.KEY_PROXIMITY_ENTERING, false);

         if (isEnter) {

             Toast.makeText(context, "已经进入目标区域", Toast.LENGTH_LONG).show();

         } else {

             Toast.makeText(context, "已经离开目标区域", Toast.LENGTH_LONG).show();

         }

     }

 }