關於Android用戶定位獲取location值為null的解決方法

在玩一個GPS的東西 獲取Location一直為null 後來是從onLocationChanged裡面拿location才搞定了 貼一下吧 代碼太亂

1. /**
2. * 主要是用戶定位操作
3. *@author jeedroid
4. */
5. package com.jeedroid.tools;
7. import java.io.IOException;
8. import java.util.List;
9. import java.util.Locale;
11. import Android.content.Context;
12. import android.location.Address;
13. import android.location.Criteria;
14. import android.location.Geocoder;
15. import android.location.Location;
16. import android.location.LocationListener;
17. import android.location.LocationManager;
18. import android.os.Bundle;
19. import android.provider.Settings;
20. import android.util.Log;
22. public class LocationTools
23. {
24. private Location location;
25. public static LocationManager getLocationManager(Context context)
26. {
27. return (LocationManager) context.getSystemService(context.LOCATION_SERVICE);
28. }
29. //獲取位置信息
30. public String getAddress(Context context)
31. {
32. LocationManager locationManager = this.getLocationManager(context);
33. if(!locationManager.isProviderEnabled(android.location.LocationManager.GPS_PROVIDER))
34. {
35. //打開GPS 需Android2.2以上系統支持
36. android.provider.Settings.Secure.setLocationProviderEnabled(context.getContentResolver(), LocationManager.GPS_PROVIDER, false);
37. }
38. return doWork(context);
39. }
41. private String doWork(Context context)
42. {
43. String addres="";
44. LocationManager locationManager = this.getLocationManager(context);
45. Criteria criteria = new Criteria();
46. // 獲得最好的定位效果
47. criteria.setAccuracy(Criteria.ACCURACY_FINE);
48. criteria.setAltitudeRequired(false);
49. criteria.setBearingRequired(false);
50. criteria.setCostAllowed(false);
51. // 使用省電模式
52. criteria.setPowerRequirement(Criteria.POWER_LOW);
53. String provider =locationManager.getBestProvider(criteria, true);
54. Log.i("provider>>>>>>", provider);
55. //獲得當前位置 location為空是一直取 從onLocationChanged裡面取
56. while(location==null)
57. {
58. location =locationManager.getLastKnownLocation(provider);
59. }
60. //locationListener
61. LocationListener locationListener = new LocationListener()
62. {
64. @Override
65. public void onLocationChanged(Location location)
66. {
67. LocationTools.this.location=location;
68. }
70. @Override
71. public void onProviderDisabled(String provider)
72. {
74. }
76. @Override
77. public void onProviderEnabled(String provider)
78. {
80. }
82. @Override
83. public void onStatusChanged(String provider, int status, Bundle extras)
84. {
86. }
88. };
89. locationManager.requestLocationUpdates(provider, 1000, 10, locationListener);
91. Geocoder geo = new Geocoder(context,Locale.getDefault());
92. try
93. {
94. List<Address> address=geo.getFromLocation(location.getLatitude(), location.getLongitude(), 1);
95. if(address.size()>0)
96. {
97. addres=address.get(0).getAddressLine(0);
98. }
99. } catch (IOException e)
100. {
101. // TODO Auto-generated catch block
102. e.printStackTrace();
103. }
104. return addres;
105. }
106. }