Android获取经纬度

通过Android的原生api获取经纬度；
一些文章都是通过mLocationManager.getProviders，getLastKnownLocation来获取的，但是在一些手机上总是为空。
例如：在一些手机Android 5.0(api21 联想手机)上getLastKnownLocation获取总为空。
可以通过getBestProvider来获取provider然后通过getLastKnownLocation获取得到经纬度。

private Location getLastKnownLocation() {
        //获取地理位置管理器
        LocationManager mLocationManager = (LocationManager) getApplicationContext().getSystemService(LOCATION_SERVICE);
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
                && ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            // TODO:去请求权限后再获取
            return null;
        }
        List<String> providers = mLocationManager.getProviders(true);
        Location bestLocation = null;
        for (String provider : providers) {
            Location l = mLocationManager.getLastKnownLocation(provider);
            if (l == null) {
                continue;
            }
            if (bestLocation == null || l.getAccuracy() < bestLocation.getAccuracy()) {
                bestLocation = l;
            }
        }
// 在一些手机5.0(api21)获取为空后，采用下面去兼容获取。
        if (bestLocation==null){
            Criteria criteria = new Criteria();
            criteria.setAccuracy(Criteria.ACCURACY_COARSE);
            criteria.setAltitudeRequired(false);
            criteria.setBearingRequired(false);
            criteria.setCostAllowed(true);
            criteria.setPowerRequirement(Criteria.POWER_LOW);
            String provider = mLocationManager.getBestProvider(criteria, true);
            if (!TextUtils.isEmpty(provider)){
                bestLocation = mLocationManager.getLastKnownLocation(provider);
            }
        }
        return bestLocation;
    }

// 使用
 Location location = getLastKnownLocation();
 LogUtils.d(TAG, "有位置权限-纬度:" + location.getLatitude() + " 经度:" + location.getLongitude());