Android 定位当前位置可能出现的问题

android关于LocationManager的gps定位

LocationManager提供了两种定位当前位置的方法 GPS和NETWORK 其中gps的误差大概50m左右 network大概500m

起初当gps打开后我使用Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);来获取location 可是一直为null不知道是什么原因网上搜了很久终于找到了解决方案

android有一个Criteria类可以直接判断当前适合用gps或者network 并且设置LocationListener监听器实时更新location 直接上代码

private void getLocalAddress() {

LocationManager locationManager;

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

Criteria criteria = new Criteria();

criteria.setAccuracy(Criteria.ACCURACY_FINE);

criteria.setAltitudeRequired(false);

criteria.setBearingRequired(false);

criteria.setCostAllowed(true);

criteria.setPowerRequirement(Criteria.POWER_LOW);

String provider = locationManager.getBestProvider(criteria, true);

Location location = locationManager.getLastKnownLocation(provider);

//updateWithNewLocation(location);

locationManager.requestLocationUpdates(provider, 2000, 10,

locationListener);

updateWithNewLocation(location);

}

private final LocationListener locationListener = new LocationListener() {

public void onLocationChanged(Location location) {

updateWithNewLocation(location);

}

public void onProviderDisabled(String provider) {

updateWithNewLocation(null);

}

public void onProviderEnabled(String provider) {

}

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

}

};

private void updateWithNewLocation(Location location) {

String latLongString;

TextView myLocationText;

if (location != null) {

double lat = location.getLatitude();

double lng = location.getLongitude();

latLongString = "纬度:" + lat + "\n经度:" + lng;

} else {

latLongString = "无法获取地理信息";

}

Toast.makeText(SearchXiaoQuActivity.this, latLongString,

Toast.LENGTH_LONG).show();

}

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