Android保证首次获取到的location对象不为空的解决方案

在阅读《第一行代码》和《疯狂android讲义》后，得到的启发式解决方案。
如果仅以GPS_PROVIDER获取location对象，那么在onCreate方法中，location一般都会为空，且在室内无法测试。
所以有了如下简单的解决方案：

package com.example.locationtest;

import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.widget.TextView;

public class MainActivity extends ActionBarActivity {

    LocationManager locationManager;
    TextView textView;
    Location location;

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

        textView = (TextView) findViewById(R.id.textView);
        locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
        // 获取location对象
        location = getBestLocation(locationManager);

        updateView(location);
        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,
                3000, 8, new LocationListener() {

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

                    @Override
                    public void onProviderEnabled(String provider) {
                        updateView(locationManager
                                .getLastKnownLocation(provider));
                    }

                    @Override
                    public void onProviderDisabled(String provider) {
                        updateView(null);
                    }

                    @Override
                    public void onLocationChanged(Location location) {
                        location = getBestLocation(locationManager);// 每次都去获取GPS_PROVIDER优先的location对象
                        updateView(location);
                    }
                });
    }

    private void updateView(Location location) {
        if (location != null) {
            StringBuffer sb = new StringBuffer();
            sb.append("位置信息：\n");
            sb.append("经度：" + location.getLongitude() + ", 纬度："
                    + location.getLatitude());
            textView.setText(sb.toString());
        } else {
            textView.setText("");
        }
    }

    /**
     * 获取location对象，优先以GPS_PROVIDER获取location对象，当以GPS_PROVIDER获取到的locaiton为null时
     * ，则以NETWORK_PROVIDER获取location对象，这样可保证在室内开启网络连接的状态下获取到的location对象不为空
     * 
     * @param locationManager
     * @return
     */
    private Location getBestLocation(LocationManager locationManager) {
        Location result = null;
        if (locationManager != null) {
            result = locationManager
                    .getLastKnownLocation(LocationManager.GPS_PROVIDER);
            if (result != null) {
                return result;
            } else {
                result = locationManager
                        .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                return result;
            }
        }
        return result;
    }

}

布局文件如下：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.locationtest.MainActivity" >

    <TextView 
        android:id="@+id/textView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
       />

</RelativeLayout>

用到的权限：

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