Android GPS

package com.qicheng.gps; import android.app.Activity; import android.content.Context; import android.content.Intent; import android.location.Criteria; import android.location.Location; import android.location.LocationListener; import android.location.LocationManager; import android.os.Bundle; import android.provider.Settings; import android.util.Log; import android.widget.TextView; import android.widget.Toast; public class index extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); openGPSSettings(); } private void openGPSSettings() { LocationManager alm = (LocationManager) this .getSystemService(Context.LOCATION_SERVICE); if (alm.isProviderEnabled(android.location.LocationManager.GPS_PROVIDER)) { Toast.makeText(this, "GPS模块正常", Toast.LENGTH_SHORT).show(); getLocation(); return; } Toast.makeText(this, "请开启GPS！", Toast.LENGTH_SHORT).show(); Intent intent = new Intent(Settings.ACTION_SECURITY_SETTINGS); startActivityForResult(intent, 0); // 此为设置完成后返回到获取界面 } } private void getLocation() { // 获取位置管理服务 LocationManager locationManager; String serviceName = Context.LOCATION_SERVICE; locationManager = (LocationManager) this.getSystemService(serviceName); // 查找到服务信息 Criteria criteria = new Criteria(); criteria.setAccuracy(Criteria.ACCURACY_FINE); // 高精度 criteria.setAltitudeRequired(false); criteria.setBearingRequired(false); criteria.setCostAllowed(true); criteria.setPowerRequirement(Criteria.POWER_LOW); // 低功耗 String provider = locationManager.getBestProvider(criteria, true); // 获取GPS信息 // Location location = locationManager.getLastKnownLocation(provider); Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER); // 通过GPS获取位置 updateToNewLocation(location); // 设置监听器，自动更新的最小时间为间隔N秒(1秒为1*1000，这样写主要为了方便)或最小位移变化超过N米 locationManager.requestLocationUpdates(provider, 2 * 1000, 500, locationListener); } private void updateToNewLocation(Location location) { TextView tv1; tv1 = (TextView) this.findViewById(R.id.tv1); if (location != null) { double latitude = location.getLatitude();//经度 double longitude = location.getLongitude();//纬度 double altitude = location.getAltitude(); //海拔 tv1.setText("维度：" + latitude + "\n经度" + longitude+"\n海拔："+altitude); } else { tv1.setText("无法获取地理信息"); } } private final LocationListener locationListener = new LocationListener() { public void onLocationChanged(Location location) { // 当坐标改变时触发此函数，如果Provider传进相同的坐标，它就不会被触发 if (location != null) { updateToNewLocation(location); } } public void onProviderDisabled(String provider) { // Provider被disable时触发此函数，比如GPS被关闭 } public void onProviderEnabled(String provider) { // Provider被enable时触发此函数，比如GPS被打开 } public void onStatusChanged(String provider, int status, Bundle extras) { // Provider的转态在可用、暂时不可用和无服务三个状态直接切换时触发此函数 } }; }