如何检查LocationManager.NETWORK_PROVIDER是否可用？

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

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

if (locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)) {
    // NETWORK_PROVIDER可用
} else {
    // NETWORK_PROVIDER不可用
}

import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

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

        if (locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)) {
            // NETWORK_PROVIDER可用
            locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 5000, 0, new LocationListener() {
                @Override
                public void onLocationChanged(Location location) {
                    // 更新位置信息
                    double latitude = location.getLatitude();
                    double longitude = location.getLongitude();
                    Toast.makeText(MainActivity.this, "Latitude: " + latitude + ", Longitude: " + longitude, Toast.LENGTH_SHORT).show();
                }

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

                }

                @Override
                public void onProviderEnabled(String provider) {

                }

                @Override
                public void onProviderDisabled(String provider) {

                }
            });
        } else {
            // NETWORK_PROVIDER不可用
            Toast.makeText(MainActivity.this, "NETWORK_PROVIDER不可用", Toast.LENGTH_SHORT).show();
        }
    }
}