android 监听网络状态的变化及实战
来源：互联网 发布：csgo优化fps 编辑：程序博客网 时间：2024/05/21 09:49
版权声明：本文为博主原创文章，未经博主允许不得转载。
目录(?)[+]
- android 监听网络状态的变化及实际应用
- 实现思路
- 使用静态广播还是动态注册广播的方式好呢
- 通过广播监听网络状态的两种方法
- 静态注册
- 动态注册
- 我们自定义的NetworkChangeListener广播
- 思路解析
- ConnectivityManager和NetworkInfo
- ConnectivityManager主要用来干什么
- 怎样获取ConnectivityManager对象呢
- 获取 NetworkInfo对象
- 网络错误情况的处理
- 代码如下
- 智能无图
- 效果图如下
- 实现的核心代码如下
- 拓展工具类
- 实现思路
android 监听网络状态的变化及实际应用
转载请注明博客地址：http://blog.csdn.NET/gdutxiaoxu/article/details/53008266
平时我们在请求错误的情况下，通常会进行处理一下，一般来说，主要分为两方面的错误
- 没有网络的错误
- 在有网络的情况下，我们客户端的错误或者服务器端的错误
今天这篇博客主要阐述以下问题
- 怎样监听网络状态的变化，包括是否打开WiFi，否打开数据网络，当前连接的网络是否可用
- 网络没有打开情况下的处理,如弹出对话框，跳转到 打开 WiFi设置的界面等
- 非WiFi情况下是否加载图片，是否播放视频等
实现思路
在网络错误的情况下获取网络状态进行判断，这种方法是可行的，但你想过了没有，如果每次都要进行这样的判断，岂不是代码量很多？有人会说，那把代码封装到一个类不就好了吗？这样确实能减少代码量，但是每次都要主动去获取，这样是不是挺麻烦的。实际上，google 早就帮我们封装好了，在网络状态变化的情况下会发出广播，我们只需要监听广播就好了 。
使用静态广播还是动态注册广播的方式好呢？
如果你不太清楚的话，我只能说即 基础不扎实。我们的应用之所以要监听网络状态的 变化，主要是为了在错误的情况下方便进行处理，退出我们当前的应用之后当然不需要监听了，所以选择动态注册广播。
- 动态注册：随着所在的Activity或者应用销毁 以后，不会受到该广播
- 静态注册：退出应用后，仍然能够收到相应的广播
共同点：都需要在AndroidMainest清单文件里面注册
通过广播监听网络状态的两种方法
静态注册
<code class="language-java hljs has-numbering"><receiver android:name=<span class="hljs-string">".network.NetworkConnectChangedReceiver"</span>> <intent-filter> <action android:name=<span class="hljs-string">"android.NET.conn.CONNECTIVITY_CHANGE"</span> /> <action android:name=<span class="hljs-string">"android.Net.wifi.WIFI_STATE_CHANGED"</span> /> <action android:name=<span class="hljs-string">"android.net.wifi.STATE_CHANGE"</span> /> </intent-filter></receiver></code><ul class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li></ul><div class="save_code tracking-ad" style="display: none;" data-mod="popu_249"><a target=_blank target="_blank"><img src="http://static.blog.csdn.net/images/save_snippets.png" alt="" /></a></div><ul class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li></ul>
动态注册
第一步：在AndroidMainest文件里面注册
<code class="hljs xml has-numbering"><span class="hljs-tag"><<span class="hljs-title">receiver</span> <span class="hljs-attribute">android:name</span>=<span class="hljs-value">".network.NetworkConnectChangedReceiver"</span>></span> <span class="hljs-tag"></<span class="hljs-title">receiver</span>></span></code><ul class="pre-numbering"><li>1</li><li>2</li></ul><div class="save_code tracking-ad" data-mod="popu_249"><a target=_blank target="_blank"><img src="http://static.blog.csdn.net/images/save_snippets.png" alt="" /></a></div><ul class="pre-numbering"><li>1</li><li>2</li></ul>
第二步：调用 Context registerReceiver(Receiver,IntentFilter) 进行注册
<code class="language-java hljs has-numbering">IntentFilter filter = <span class="hljs-keyword">new</span> IntentFilter();filter.addAction(<span class="hljs-string">"android.net.conn.CONNECTIVITY_CHANGE"</span>);filter.addAction(<span class="hljs-string">"android.net.wifi.WIFI_STATE_CHANGED"</span>);filter.addAction(<span class="hljs-string">"android.net.wifi.STATE_CHANGE"</span>);registerReceiver(mNetworkChangeListener,filter);</code><ul class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li></ul><div class="save_code tracking-ad" style="display: none;" data-mod="popu_249"><a target=_blank target="_blank"><img src="http://static.blog.csdn.net/images/save_snippets.png" alt="" /></a></div><ul class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li></ul>
我们自定义的NetworkChangeListener广播
<code class="language-java hljs has-numbering"><span class="hljs-javadoc">/** * 网络改变监控广播 * <p> * 监听网络的改变状态,只有在用户操作网络连接开关(wifi,mobile)的时候接受广播, * 然后对相应的界面进行相应的操作，并将 状态 保存在我们的APP里面 * <p> * <p> * Created by xujun */</span><span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">NetworkConnectChangedReceiver</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">BroadcastReceiver</span> {</span> <span class="hljs-keyword">private</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">final</span> String TAG = <span class="hljs-string">"xujun"</span>; <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">final</span> String TAG1 = <span class="hljs-string">"xxx"</span>; <span class="hljs-annotation">@Override</span> <span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">onReceive</span>(Context context, Intent intent) { <span class="hljs-comment">// 这个监听wifi的打开与关闭，与wifi的连接无关</span> <span class="hljs-keyword">if</span> (WifiManager.WIFI_STATE_CHANGED_ACTION.equals(intent.getAction())) { <span class="hljs-keyword">int</span> wifiState = intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE, <span class="hljs-number">0</span>); Log.e(TAG1, <span class="hljs-string">"wifiState"</span> + wifiState); <span class="hljs-keyword">switch</span> (wifiState) { <span class="hljs-keyword">case</span> WifiManager.WIFI_STATE_DISABLED: APP.getInstance().setEnablaWifi(<span class="hljs-keyword">false</span>); <span class="hljs-keyword">break</span>; <span class="hljs-keyword">case</span> WifiManager.WIFI_STATE_DISABLING: <span class="hljs-keyword">break</span>; <span class="hljs-keyword">case</span> WifiManager.WIFI_STATE_ENABLING: <span class="hljs-keyword">break</span>; <span class="hljs-keyword">case</span> WifiManager.WIFI_STATE_ENABLED: APP.getInstance().setEnablaWifi(<span class="hljs-keyword">true</span>); <span class="hljs-keyword">break</span>; <span class="hljs-keyword">case</span> WifiManager.WIFI_STATE_UNKNOWN: <span class="hljs-keyword">break</span>; <span class="hljs-keyword">default</span>: <span class="hljs-keyword">break</span>; } } <span class="hljs-comment">// 这个监听wifi的连接状态即是否连上了一个有效无线路由，当上边广播的状态是WifiManager</span> <span class="hljs-comment">// .WIFI_STATE_DISABLING，和WIFI_STATE_DISABLED的时候，根本不会接到这个广播。</span> <span class="hljs-comment">// 在上边广播接到广播是WifiManager.WIFI_STATE_ENABLED状态的同时也会接到这个广播，</span> <span class="hljs-comment">// 当然刚打开wifi肯定还没有连接到有效的无线</span> <span class="hljs-keyword">if</span> (WifiManager.NETWORK_STATE_CHANGED_ACTION.equals(intent.getAction())) { Parcelable parcelableExtra = intent .getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO); <span class="hljs-keyword">if</span> (<span class="hljs-keyword">null</span> != parcelableExtra) { NetworkInfo networkInfo = (NetworkInfo) parcelableExtra; State state = networkInfo.getState(); <span class="hljs-keyword">boolean</span> isConnected = state == State.CONNECTED;<span class="hljs-comment">// 当然，这边可以更精确的确定状态</span> Log.e(TAG1, <span class="hljs-string">"isConnected"</span> + isConnected); <span class="hljs-keyword">if</span> (isConnected) { APP.getInstance().setWifi(<span class="hljs-keyword">true</span>); } <span class="hljs-keyword">else</span> { APP.getInstance().setWifi(<span class="hljs-keyword">false</span>); } } } <span class="hljs-comment">// 这个监听网络连接的设置，包括wifi和移动数据的打开和关闭。.</span> <span class="hljs-comment">// 最好用的还是这个监听。wifi如果打开，关闭，以及连接上可用的连接都会接到监听。见log</span> <span class="hljs-comment">// 这个广播的最大弊端是比上边两个广播的反应要慢，如果只是要监听wifi，我觉得还是用上边两个配合比较合适</span> <span class="hljs-keyword">if</span> (ConnectivityManager.CONNECTIVITY_ACTION.equals(intent.getAction())) { ConnectivityManager manager = (ConnectivityManager) context .getSystemService(Context.CONNECTIVITY_SERVICE); Log.i(TAG1, <span class="hljs-string">"CONNECTIVITY_ACTION"</span>); NetworkInfo activeNetwork = manager.getActiveNetworkInfo(); <span class="hljs-keyword">if</span> (activeNetwork != <span class="hljs-keyword">null</span>) { <span class="hljs-comment">// connected to the internet</span> <span class="hljs-keyword">if</span> (activeNetwork.isConnected()) { <span class="hljs-keyword">if</span> (activeNetwork.getType() == ConnectivityManager.TYPE_WIFI) { <span class="hljs-comment">// connected to wifi</span> APP.getInstance().setWifi(<span class="hljs-keyword">true</span>); Log.e(TAG, <span class="hljs-string">"当前WiFi连接可用 "</span>); } <span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> (activeNetwork.getType() == ConnectivityManager.TYPE_MOBILE) { <span class="hljs-comment">// connected to the mobile provider's data plan</span> APP.getInstance().setMobile(<span class="hljs-keyword">true</span>); Log.e(TAG, <span class="hljs-string">"当前移动网络连接可用 "</span>); } } <span class="hljs-keyword">else</span> { Log.e(TAG, <span class="hljs-string">"当前没有网络连接，请确保你已经打开网络 "</span>); } Log.e(TAG1, <span class="hljs-string">"info.getTypeName()"</span> + activeNetwork.getTypeName()); Log.e(TAG1, <span class="hljs-string">"getSubtypeName()"</span> + activeNetwork.getSubtypeName()); Log.e(TAG1, <span class="hljs-string">"getState()"</span> + activeNetwork.getState()); Log.e(TAG1, <span class="hljs-string">"getDetailedState()"</span> + activeNetwork.getDetailedState().name()); Log.e(TAG1, <span class="hljs-string">"getDetailedState()"</span> + activeNetwork.getExtraInfo()); Log.e(TAG1, <span class="hljs-string">"getType()"</span> + activeNetwork.getType()); } <span class="hljs-keyword">else</span> { <span class="hljs-comment">// not connected to the internet</span> Log.e(TAG, <span class="hljs-string">"当前没有网络连接，请确保你已经打开网络 "</span>); APP.getInstance().setWifi(<span class="hljs-keyword">false</span>); APP.getInstance().setMobile(<span class="hljs-keyword">false</span>); APP.getInstance().setConnected(<span class="hljs-keyword">false</span>); } } }}</code><ul class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li><li>28</li><li>29</li><li>30</li><li>31</li><li>32</li><li>33</li><li>34</li><li>35</li><li>36</li><li>37</li><li>38</li><li>39</li><li>40</li><li>41</li><li>42</li><li>43</li><li>44</li><li>45</li><li>46</li><li>47</li><li>48</li><li>49</li><li>50</li><li>51</li><li>52</li><li>53</li><li>54</li><li>55</li><li>56</li><li>57</li><li>58</li><li>59</li><li>60</li><li>61</li><li>62</li><li>63</li><li>64</li><li>65</li><li>66</li><li>67</li><li>68</li><li>69</li><li>70</li><li>71</li><li>72</li><li>73</li><li>74</li><li>75</li><li>76</li><li>77</li><li>78</li><li>79</li><li>80</li><li>81</li><li>82</li><li>83</li><li>84</li><li>85</li><li>86</li><li>87</li><li>88</li><li>89</li><li>90</li><li>91</li><li>92</li><li>93</li><li>94</li><li>95</li><li>96</li><li>97</li><li>98</li><li>99</li><li>100</li><li>101</li><li>102</li><li>103</li><li>104</li><li>105</li><li>106</li><li>107</li></ul><div class="save_code tracking-ad" style="display: none;" data-mod="popu_249"><a target=_blank target="_blank"><img src="http://static.blog.csdn.net/images/save_snippets.png" alt="" /></a></div><ul class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li><li>28</li><li>29</li><li>30</li><li>31</li><li>32</li><li>33</li><li>34</li><li>35</li><li>36</li><li>37</li><li>38</li><li>39</li><li>40</li><li>41</li><li>42</li><li>43</li><li>44</li><li>45</li><li>46</li><li>47</li><li>48</li><li>49</li><li>50</li><li>51</li><li>52</li><li>53</li><li>54</li><li>55</li><li>56</li><li>57</li><li>58</li><li>59</li><li>60</li><li>61</li><li>62</li><li>63</li><li>64</li><li>65</li><li>66</li><li>67</li><li>68</li><li>69</li><li>70</li><li>71</li><li>72</li><li>73</li><li>74</li><li>75</li><li>76</li><li>77</li><li>78</li><li>79</li><li>80</li><li>81</li><li>82</li><li>83</li><li>84</li><li>85</li><li>86</li><li>87</li><li>88</li><li>89</li><li>90</li><li>91</li><li>92</li><li>93</li><li>94</li><li>95</li><li>96</li><li>97</li><li>98</li><li>99</li><li>100</li><li>101</li><li>102</li><li>103</li><li>104</li><li>105</li><li>106</li><li>107</li></ul>最后，别忘记添加一下权限
<code class="language-java hljs has-numbering"><uses-permission android:name=<span class="hljs-string">"android.permission.INTERNET"</span>/> <!--允许读取网络状态--> <uses-permission android:name=<span class="hljs-string">"android.permission.ACCESS_NETWORK_STATE"</span>></uses-permission><!--允许读取wifi网络状态--> <uses-permission android:name=<span class="hljs-string">"android.permission.ACCESS_WIFI_STATE"</span>/></code><ul class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li></ul><div class="save_code tracking-ad" style="display: none;" data-mod="popu_249"><a target=_blank target="_blank"><img src="http://static.blog.csdn.net/images/save_snippets.png" alt="" /></a></div><ul class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li></ul>
思路解析
从上面的代码中，我们可以知道我们将我们当前的网络状态保存在我们的 APP 里面，这样当网络状态变化的时候会自动去改变 APP 里面相应的状态量，我们进行网络处理的 时候只需要去获取 APP里面的状态量，便可以判断出是属于哪一种网络错误，是不是很方便呢。
至于广播的Action主要有三种类型：
WifiManager.WIFI_STATE_CHANGED_ACTION
这个监听wifi的打开与关闭，与wifi的连接无关
WifiManager.NETWORK_STATE_CHANGED_ACTION：
这个监听wifi的连接状态即是否连上了一个有效无线路由，当上边广播的状态是WifiManager.WIFI_STATE_DISABLING，和WIFI_STATE_DISABLED的时候，根本不会接到这个广播。
在上边广播接到广播是WifiManager.WIFI_STATE_ENABLED状态的同时也会接到这个广播，当然刚打开wifi肯定还没有连接到有效的无线
ConnectivityManager.CONNECTIVITY_ACTION
这个监听网络连接的设置，包括wifi和移动数据的打开和关闭。.
最好用的还是这个监听。wifi如果打开，关闭，以及连接上可用的连接都会接到监听。这个广播的最大弊端是比上边两个广播的反应要慢，如果只是要监听wifi，我觉得还是用上边两个配合比较合适。
至于这个ConnectivityManager，NetworkInfo是什么东西，别急，下面会大概介绍一下。
ConnectivityManager和NetworkInfo
ConnectivityManager主要用来干什么
- Monitor network connections (Wi-Fi, GPRS, UMTS, etc.) （用来处理网络连接 ，包括Wi-Fi, GPRS, UMTS等）
- Send broadcast intents when network connectivity changes（用 网络状态发生变化的时候发出 广播 ）
- Attempt to “fail over” to another network when connectivity to a network is lost（但断开网络连接的时候，尝试去；连接另外一个网络
- Provide an API that allows applications to query the coarse-grained or fine-grained state of the available networks（
- Provide an API that allows applications to request and select networks for their data traffic
怎样获取ConnectivityManager对象呢？
<code class="hljs avrasm has-numbering">ConnectivityManager cm = (ConnectivityManager) context<span class="hljs-preprocessor">.getSystemService</span>(Context <span class="hljs-preprocessor">.CONNECTIVITY</span>_SERVICE)<span class="hljs-comment">;</span></code><ul class="pre-numbering"><li>1</li><li>2</li></ul><div class="save_code tracking-ad" data-mod="popu_249"><a target=_blank target="_blank"><img src="http://static.blog.csdn.net/images/save_snippets.png" alt="" /></a></div><ul class="pre-numbering"><li>1</li><li>2</li></ul>
获取 NetworkInfo对象
主要有一下 几种方法
- getNetworkInfo(int networkType)，但是这个方法已经过时，官网的解释如下：This method was deprecated in API level 23. This method does not support multiple connected networks of the same type. Use getAllNetworks() and getNetworkInfo(android.net.Network) instead.
- getNetworkInfo(Network network)
- getActiveNetwork()
Returns a Network object corresponding to the currently active default data network. - getActiveNetworkInfo()，Returns details about the currently active default data network.
- getAllNetworkInfo()这个方法已经过时，Use getAllNetworks() and getNetworkInfo(android.net.Network) instead.
综上所述，我们如果要知道当前Mobile网络或者WiFi网络是否已经连接上，总共有两种方法。
第一种方法，只不过在 API23的时候已经 过时了
<code class="language-java hljs has-numbering">State wifiState = <span class="hljs-keyword">null</span>;State mobileState = <span class="hljs-keyword">null</span>;ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context .CONNECTIVITY_SERVICE);wifiState = cm.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState();mobileState = cm.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState();Log.d(TAG1, <span class="hljs-string">"wifi状态:"</span> + wifiState + <span class="hljs-string">"\n mobile状态:"</span> + mobileState);<span class="hljs-keyword">if</span> (wifiState != <span class="hljs-keyword">null</span> && mobileState != <span class="hljs-keyword">null</span> && State.CONNECTED != wifiState && State.CONNECTED == mobileState) {<span class="hljs-comment">// 手机网络连接成功 </span> Log.d(TAG1, <span class="hljs-string">"手机2g/3g/4g网络连接成功"</span>); APP.getInstance().setMobile(<span class="hljs-keyword">true</span>); APP.getInstance().setWifi(<span class="hljs-keyword">false</span>); APP.getInstance().setConnected(<span class="hljs-keyword">true</span>);} <span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> (wifiState != <span class="hljs-keyword">null</span> && State.CONNECTED == wifiState) {<span class="hljs-comment">// 无线网络连接成功 </span> Log.d(TAG1, <span class="hljs-string">"无线网络连接成功"</span>); APP.getInstance().setMobile(<span class="hljs-keyword">false</span>); APP.getInstance().setWifi(<span class="hljs-keyword">true</span>); APP.getInstance().setConnected(<span class="hljs-keyword">true</span>);} <span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> (wifiState != <span class="hljs-keyword">null</span> && mobileState != <span class="hljs-keyword">null</span> && State.CONNECTED != wifiState && State.CONNECTED != mobileState) {<span class="hljs-comment">// 手机没有任何的网络 </span> Log.d(TAG1, <span class="hljs-string">"手机没有任何的网络"</span>); APP.getInstance().setMobile(<span class="hljs-keyword">false</span>); APP.getInstance().setWifi(<span class="hljs-keyword">false</span>); APP.getInstance().setConnected(<span class="hljs-keyword">false</span>);}</code><ul class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li><li>28</li><li>29</li><li>30</li><li>31</li><li>32</li><li>33</li><li>34</li><li>35</li><li>36</li><li>37</li><li>38</li><li>39</li><li>40</li><li>41</li></ul><div class="save_code tracking-ad" style="display: none;" data-mod="popu_249"><a target=_blank target="_blank"><img src="http://static.blog.csdn.net/images/save_snippets.png" alt="" /></a></div><ul class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li><li>28</li><li>29</li><li>30</li><li>31</li><li>32</li><li>33</li><li>34</li><li>35</li><li>36</li><li>37</li><li>38</li><li>39</li><li>40</li><li>41</li></ul>第二种方法
<code class="language-java hljs has-numbering">ConnectivityManager manager = (ConnectivityManager) context .getSystemService(Context.CONNECTIVITY_SERVICE);Log.i(TAG1, <span class="hljs-string">"CONNECTIVITY_ACTION"</span>);NetworkInfo activeNetwork = manager.getActiveNetworkInfo();<span class="hljs-keyword">if</span> (activeNetwork != <span class="hljs-keyword">null</span>) { <span class="hljs-comment">// connected to the internet</span> <span class="hljs-keyword">if</span> (activeNetwork.isConnected()) { <span class="hljs-keyword">if</span> (activeNetwork.getType() == ConnectivityManager.TYPE_WIFI) { <span class="hljs-comment">// connected to wifi</span> APP.getInstance().setWifi(<span class="hljs-keyword">true</span>); Log.e(TAG, <span class="hljs-string">"当前WiFi连接可用 "</span>); } <span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> (activeNetwork.getType() == ConnectivityManager.TYPE_MOBILE) { <span class="hljs-comment">// connected to the mobile provider's data plan</span> APP.getInstance().setMobile(<span class="hljs-keyword">true</span>); Log.e(TAG, <span class="hljs-string">"当前移动网络连接可用 "</span>); } } <span class="hljs-keyword">else</span> { Log.e(TAG, <span class="hljs-string">"当前没有网络连接，请确保你已经打开网络 "</span>); }} <span class="hljs-keyword">else</span> { <span class="hljs-comment">// not connected to the internet</span> Log.e(TAG, <span class="hljs-string">"当前没有网络连接，请确保你已经打开网络 "</span>); APP.getInstance().setWifi(<span class="hljs-keyword">false</span>); APP.getInstance().setMobile(<span class="hljs-keyword">false</span>); APP.getInstance().setConnected(<span class="hljs-keyword">false</span>);}</code><ul class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li></ul><div class="save_code tracking-ad" style="display: none;" data-mod="popu_249"><a target=_blank target="_blank"><img src="http://static.blog.csdn.net/images/save_snippets.png" alt="" /></a></div><ul class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li></ul>网络错误情况的处理
正如前面所提到的，这篇博客吧网络错误主要分为两大类
- 没有网络情况的错误
- 在有网络的情况下，我们客户端的错误或者服务器端的错误
在这里 我们主要处理没有网络情况下的错误，现在 个人了解到 的主要有两种处理方法。
第一种做法：
在APP启动的 时候检查当前是否已经连接上网络，弹出一个对话框没有的话跳转到设置界面或者WiFi设置界面或者打开移动网络界面 。
第二种方法
其实跟第一种做法差不多，只是在每一次 错误的情况下，都会判断当前有没有 网络 ，没有弹出一个对话框，跳转到设置界面或者WiFi设置界面或者打开移动网络界面 ， 下面我们我们一起来看一下 怎样弹出一个对话框，并且跳转到相应的设置界面
这里我们采取第一种做法，效果图如下
代码如下
<code class="language-java hljs has-numbering"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title">showWifiDlg</span>(<span class="hljs-keyword">final</span> Context context) { AlertDialog.Builder builder = <span class="hljs-keyword">new</span> AlertDialog.Builder(context.getApplicationContext()); <span class="hljs-keyword">if</span> (mWifiDialog == <span class="hljs-keyword">null</span>) { mWifiDialog = builder.setIcon(R.drawable.ic_launcher) <span class="hljs-comment">//</span> .setTitle(<span class="hljs-string">"wifi设置"</span>) <span class="hljs-comment">//</span> .setMessage(<span class="hljs-string">"当前无网络"</span>).setPositiveButton(<span class="hljs-string">"设置"</span>, <span class="hljs-keyword">new</span> DialogInterface .OnClickListener() { <span class="hljs-annotation">@Override</span> <span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">onClick</span>(DialogInterface dialog, <span class="hljs-keyword">int</span> which) { <span class="hljs-comment">// 跳转到系统的网络设置界面</span> Intent intent = <span class="hljs-keyword">null</span>; <span class="hljs-comment">// 先判断当前系统版本</span> <span class="hljs-keyword">if</span> (android.os.Build.VERSION.SDK_INT > <span class="hljs-number">10</span>) { <span class="hljs-comment">// 3.0以上</span> intent = <span class="hljs-keyword">new</span> Intent(android.provider.Settings .ACTION_WIFI_SETTINGS); } <span class="hljs-keyword">else</span> { intent = <span class="hljs-keyword">new</span> Intent(); intent.setClassName(<span class="hljs-string">"com.android.settings"</span>, Settings.ACTION_WIFI_SETTINGS); } <span class="hljs-keyword">if</span> ((context <span class="hljs-keyword">instanceof</span> Application)) { intent.addFlags(FLAG_ACTIVITY_NEW_TASK); } context.startActivity(intent); } }).setNegativeButton(<span class="hljs-string">"知道了"</span>, <span class="hljs-keyword">null</span>).create(); <span class="hljs-comment">// 设置为系统的Dialog，这样使用Application的时候不会 报错</span> mWifiDialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT); } mWifiDialog.show();}</code><ul class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li><li>28</li><li>29</li><li>30</li><li>31</li><li>32</li><li>33</li><li>34</li><li>35</li><li>36</li></ul><div class="save_code tracking-ad" data-mod="popu_249"><a target=_blank target="_blank"><img src="http://static.blog.csdn.net/images/save_snippets.png" alt="" /></a></div><ul class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li><li>28</li><li>29</li><li>30</li><li>31</li><li>32</li><li>33</li><li>34</li><li>35</li><li>36</li></ul>这里对几个 重要的 Action说一下
- ACTION_DATA_ROAMING_SETTINGS ： 跳转到移动网络设置界面
- ACTION_WIFI_SETTINGS
Activity Action: Show settings to allow configuration of Wi-Fi. - ACTION_WIRELESS_SETTINGS
Activity Action: Show settings to allow configuration of wireless controls such as Wi-Fi, Bluetooth and Mobile networks.
关于更多Activity Action，请参考官网地址
需要注意的是
若我们 使用的Context不是Activity 的Context 而是Application的 Context，我们 需要做以下处理 ，否则会报错
<code class="language-java hljs has-numbering"><span class="hljs-comment">// 设置为系统级别的Dialog</span>mWifiDialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);<span class="hljs-keyword">if</span> ((context <span class="hljs-keyword">instanceof</span> Application)) { intent.addFlags(FLAG_ACTIVITY_NEW_TASK); }context.startActivity(intent);在AndroidMainFest中添加以下权限 。 <!--允许 弹出系统级别的AlterDialog--> <uses-permission android:name=<span class="hljs-string">"android.permission.SYSTEM_ALERT_WINDOW"</span>/></code><ul class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li></ul><div class="save_code tracking-ad" data-mod="popu_249"><a target=_blank target="_blank"><img src="http://static.blog.csdn.net/images/save_snippets.png" alt="" /></a></div><ul class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li></ul>智能无图
智能无图，这种浏览模式我们平时 很常见，比如在UC浏览器中，网易新闻中都有看到这种模式，这种模式的实质就是监听网络状态，再根据是否是WiFi去确定是否加载网络图片。
效果图如下
我们可以看到在开启智能无图的情况下，若不是连接WiFi ，我们是不会去加载网络图片的。
实现的核心代码如下
1）当智能无图模式变化的时候，我们会把标志存进SharePreferences中
<code class="language-java hljs has-numbering">mSwitchWifiPic.setOnCheckedChangeListener(<span class="hljs-keyword">new</span> CompoundButton.OnCheckedChangeListener() { <span class="hljs-annotation">@Override</span> <span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">onCheckedChanged</span>(CompoundButton buttonView, <span class="hljs-keyword">boolean</span> isChecked) { SPUtils.put(SPConstants.isIntelligentNoPic,isChecked); }});</code><ul class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li></ul><div class="save_code tracking-ad" data-mod="popu_249"><a target=_blank target="_blank"><img src="http://static.blog.csdn.net/images/save_snippets.png" alt="" /></a></div><ul class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li></ul>同时我们为了进来的时候界面与SharePreferences中的 isIntelligentNoPic的值保持一致，我们需要调用一下代码
<code class="hljs avrasm has-numbering">boolean isIntelligentNoPic = SPUtils<span class="hljs-preprocessor">.getBoolean</span>(SPConstants<span class="hljs-preprocessor">.isIntelligentNoPic</span>)<span class="hljs-comment">;</span>mSwitchWifiPic<span class="hljs-preprocessor">.setChecked</span>(isIntelligentNoPic)<span class="hljs-comment">;</span></code><ul class="pre-numbering"><li>1</li><li>2</li><li>3</li></ul><div class="save_code tracking-ad" data-mod="popu_249"><a target=_blank target="_blank"><img src="http://static.blog.csdn.net/images/save_snippets.png" alt="" /></a></div><ul class="pre-numbering"><li>1</li><li>2</li><li>3</li></ul>
2）在NewsListAdapter中
<code class="language-java hljs has-numbering"><span class="hljs-comment">// 是否开启智能无图模式，true表示开启智能无图模式</span><span class="hljs-keyword">boolean</span> isIntelligentNoPic = SPUtils.getBoolean(Constants.SPConstants.isIntelligentNoPic);WriteLogUtil.i(<span class="hljs-string">"isIntelligentNoPic="</span> + isIntelligentNoPic);<span class="hljs-keyword">if</span> (isIntelligentNoPic) { <span class="hljs-keyword">if</span> (APP.getInstance().isWifi()) { GlideUtils.display(mContext, iv, picUrl); } <span class="hljs-keyword">else</span> { iv.setImageDrawable(<span class="hljs-keyword">new</span> ColorDrawable(Color.GRAY)); }} <span class="hljs-keyword">else</span> { GlideUtils.display(mContext, iv, picUrl);}</code><ul class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li></ul><div class="save_code tracking-ad" data-mod="popu_249"><a target=_blank target="_blank"><img src="http://static.blog.csdn.net/images/save_snippets.png" alt="" /></a></div><ul class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li></ul>至于APP.getInstance().isWifi()表示当前是否连接WiFi，是通过 监听广播实现的 ，前面已经说明了，这里就不再阐述了。
拓展工具类
以下工具类参考Android获取网络状态
<code class="language-java hljs has-numbering"><span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">NetStateUtils</span> {</span> <span class="hljs-javadoc">/** * 判断当前网络是否是移动网络 * *<span class="hljs-javadoctag"> @param</span> context *<span class="hljs-javadoctag"> @return</span> boolean */</span> <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">boolean</span> <span class="hljs-title">is3G</span>(Context context) { ConnectivityManager connectivityManager = (ConnectivityManager) context .getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo activeNetInfo = connectivityManager.getActiveNetworkInfo(); <span class="hljs-keyword">if</span> (activeNetInfo != <span class="hljs-keyword">null</span> && activeNetInfo.getType() == ConnectivityManager.TYPE_MOBILE) { <span class="hljs-keyword">return</span> <span class="hljs-keyword">true</span>; } <span class="hljs-keyword">return</span> <span class="hljs-keyword">false</span>; } <span class="hljs-javadoc">/** * 判断当前网络是否是wifi网络 * *<span class="hljs-javadoctag"> @param</span> context *<span class="hljs-javadoctag"> @return</span> boolean */</span> <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">boolean</span> <span class="hljs-title">isWifi</span>(Context context) { ConnectivityManager connectivityManager = (ConnectivityManager) context .getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo activeNetInfo = connectivityManager.getActiveNetworkInfo(); <span class="hljs-keyword">if</span> (activeNetInfo != <span class="hljs-keyword">null</span> && activeNetInfo.getType() == ConnectivityManager.TYPE_WIFI) { <span class="hljs-keyword">return</span> <span class="hljs-keyword">true</span>; } <span class="hljs-keyword">return</span> <span class="hljs-keyword">false</span>; } <span class="hljs-javadoc">/** * 判断当前网络是否是2G网络 * *<span class="hljs-javadoctag"> @param</span> context *<span class="hljs-javadoctag"> @return</span> boolean */</span> <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">boolean</span> <span class="hljs-title">is2G</span>(Context context) { ConnectivityManager connectivityManager = (ConnectivityManager) context .getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo activeNetInfo = connectivityManager.getActiveNetworkInfo(); <span class="hljs-keyword">if</span> (activeNetInfo != <span class="hljs-keyword">null</span> && (activeNetInfo.getSubtype() == TelephonyManager.NETWORK_TYPE_EDGE || activeNetInfo.getSubtype() == TelephonyManager.NETWORK_TYPE_GPRS || activeNetInfo .getSubtype() == TelephonyManager.NETWORK_TYPE_CDMA)) { <span class="hljs-keyword">return</span> <span class="hljs-keyword">true</span>; } <span class="hljs-keyword">return</span> <span class="hljs-keyword">false</span>; } <span class="hljs-javadoc">/** * wifi是否打开 */</span> <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">boolean</span> <span class="hljs-title">isWifiEnabled</span>(Context context) { ConnectivityManager mgrConn = (ConnectivityManager) context .getSystemService(Context.CONNECTIVITY_SERVICE); TelephonyManager mgrTel = (TelephonyManager) context .getSystemService(Context.TELEPHONY_SERVICE); <span class="hljs-keyword">return</span> ((mgrConn.getActiveNetworkInfo() != <span class="hljs-keyword">null</span> && mgrConn .getActiveNetworkInfo().getState() == NetworkInfo.State.CONNECTED) || mgrTel .getNetworkType() == TelephonyManager.NETWORK_TYPE_UMTS); } <span class="hljs-javadoc">/** * 判断是否有网络连接 * *<span class="hljs-javadoctag"> @param</span> context *<span class="hljs-javadoctag"> @return</span> */</span> <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">boolean</span> <span class="hljs-title">isNetworkConnected</span>(Context context) { <span class="hljs-keyword">if</span> (context != <span class="hljs-keyword">null</span>) { <span class="hljs-comment">// 获取手机所有连接管理对象(包括对wi-fi,net等连接的管理)</span> ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context .CONNECTIVITY_SERVICE); <span class="hljs-comment">// 获取NetworkInfo对象</span> NetworkInfo networkInfo = manager.getActiveNetworkInfo(); <span class="hljs-comment">//判断NetworkInfo对象是否为空</span> <span class="hljs-keyword">if</span> (networkInfo != <span class="hljs-keyword">null</span>) <span class="hljs-keyword">return</span> networkInfo.isAvailable(); } <span class="hljs-keyword">return</span> <span class="hljs-keyword">false</span>; } <span class="hljs-javadoc">/** * 判断MOBILE网络是否可用 * *<span class="hljs-javadoctag"> @param</span> context *<span class="hljs-javadoctag"> @param</span> context *<span class="hljs-javadoctag"> @return</span> */</span> <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">boolean</span> <span class="hljs-title">isMobileConnected</span>(Context context) { <span class="hljs-keyword">if</span> (context != <span class="hljs-keyword">null</span>) { <span class="hljs-comment">//获取手机所有连接管理对象(包括对wi-fi,net等连接的管理)</span> ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context .CONNECTIVITY_SERVICE); <span class="hljs-comment">//获取NetworkInfo对象</span> NetworkInfo networkInfo = manager.getActiveNetworkInfo(); <span class="hljs-comment">//判断NetworkInfo对象是否为空 并且类型是否为MOBILE</span> <span class="hljs-keyword">if</span> (networkInfo != <span class="hljs-keyword">null</span> && networkInfo.getType() == ConnectivityManager.TYPE_MOBILE) <span class="hljs-keyword">return</span> networkInfo.isAvailable(); } <span class="hljs-keyword">return</span> <span class="hljs-keyword">false</span>; } <span class="hljs-javadoc">/** * 获取当前网络连接的类型信息 * 原生 * *<span class="hljs-javadoctag"> @param</span> context *<span class="hljs-javadoctag"> @return</span> */</span> <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">int</span> <span class="hljs-title">getConnectedType</span>(Context context) { <span class="hljs-keyword">if</span> (context != <span class="hljs-keyword">null</span>) { <span class="hljs-comment">//获取手机所有连接管理对象</span> ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context .CONNECTIVITY_SERVICE); <span class="hljs-comment">//获取NetworkInfo对象</span> NetworkInfo networkInfo = manager.getActiveNetworkInfo(); <span class="hljs-keyword">if</span> (networkInfo != <span class="hljs-keyword">null</span> && networkInfo.isAvailable()) { <span class="hljs-comment">//返回NetworkInfo的类型</span> <span class="hljs-keyword">return</span> networkInfo.getType(); } } <span class="hljs-keyword">return</span> -<span class="hljs-number">1</span>; } <span class="hljs-javadoc">/** * 获取当前的网络状态 ：没有网络-0：WIFI网络1：4G网络-4：3G网络-3：2G网络-2 * 自定义 * *<span class="hljs-javadoctag"> @param</span> context *<span class="hljs-javadoctag"> @return</span> */</span> <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">int</span> <span class="hljs-title">getAPNType</span>(Context context) { <span class="hljs-comment">//结果返回值</span> <span class="hljs-keyword">int</span> netType = <span class="hljs-number">0</span>; <span class="hljs-comment">//获取手机所有连接管理对象</span> ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context .CONNECTIVITY_SERVICE); <span class="hljs-comment">//获取NetworkInfo对象</span> NetworkInfo networkInfo = manager.getActiveNetworkInfo(); <span class="hljs-comment">//NetworkInfo对象为空 则代表没有网络</span> <span class="hljs-keyword">if</span> (networkInfo == <span class="hljs-keyword">null</span>) { <span class="hljs-keyword">return</span> netType; } <span class="hljs-comment">//否则 NetworkInfo对象不为空 则获取该networkInfo的类型</span> <span class="hljs-keyword">int</span> nType = networkInfo.getType(); <span class="hljs-keyword">if</span> (nType == ConnectivityManager.TYPE_WIFI) { <span class="hljs-comment">//WIFI</span> netType = <span class="hljs-number">1</span>; } <span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> (nType == ConnectivityManager.TYPE_MOBILE) { <span class="hljs-keyword">int</span> nSubType = networkInfo.getSubtype(); TelephonyManager telephonyManager = (TelephonyManager) context.getSystemService (Context.TELEPHONY_SERVICE); <span class="hljs-comment">//3G 联通的3G为UMTS或HSDPA 电信的3G为EVDO</span> <span class="hljs-keyword">if</span> (nSubType == TelephonyManager.NETWORK_TYPE_LTE && !telephonyManager.isNetworkRoaming()) { netType = <span class="hljs-number">4</span>; } <span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> (nSubType == TelephonyManager.NETWORK_TYPE_UMTS || nSubType == TelephonyManager.NETWORK_TYPE_HSDPA || nSubType == TelephonyManager.NETWORK_TYPE_EVDO_0 && !telephonyManager.isNetworkRoaming()) { netType = <span class="hljs-number">3</span>; <span class="hljs-comment">//2G 移动和联通的2G为GPRS或EGDE，电信的2G为CDMA</span> } <span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> (nSubType == TelephonyManager.NETWORK_TYPE_GPRS || nSubType == TelephonyManager.NETWORK_TYPE_EDGE || nSubType == TelephonyManager.NETWORK_TYPE_CDMA && !telephonyManager.isNetworkRoaming()) { netType = <span class="hljs-number">2</span>; } <span class="hljs-keyword">else</span> { netType = <span class="hljs-number">2</span>; } } <span class="hljs-keyword">return</span> netType; } <span class="hljs-javadoc">/** * 判断GPS是否打开 * ACCESS_FINE_LOCATION权限 * *<span class="hljs-javadoctag"> @param</span> context *<span class="hljs-javadoctag"> @return</span> */</span> <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">boolean</span> <span class="hljs-title">isGPSEnabled</span>(Context context) { <span class="hljs-comment">//获取手机所有连接LOCATION_SERVICE对象</span> LocationManager locationManager = ((LocationManager) context.getSystemService(Context .LOCATION_SERVICE)); <span class="hljs-keyword">return</span> locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER); } <span class="hljs-javadoc">/** * 获得本机ip地址 * *<span class="hljs-javadoctag"> @return</span> */</span> <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> String <span class="hljs-title">GetHostIp</span>() { <span class="hljs-keyword">try</span> { <span class="hljs-keyword">for</span> (Enumeration<NetworkInterface> en = NetworkInterface .getNetworkInterfaces(); en.hasMoreElements(); ) { NetworkInterface intf = en.nextElement(); <span class="hljs-keyword">for</span> (Enumeration<InetAddress> ipAddr = intf.getInetAddresses(); ipAddr .hasMoreElements(); ) { InetAddress inetAddress = ipAddr.nextElement(); <span class="hljs-keyword">if</span> (!inetAddress.isLoopbackAddress()) { <span class="hljs-keyword">return</span> inetAddress.getHostAddress(); } } } } <span class="hljs-keyword">catch</span> (SocketException ex) { } <span class="hljs-keyword">catch</span> (Exception e) { } <span class="hljs-keyword">return</span> <span class="hljs-keyword">null</span>; } <span class="hljs-javadoc">/** * 获取本机串号imei * *<span class="hljs-javadoctag"> @param</span> context *<span class="hljs-javadoctag"> @return</span> */</span> <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> String <span class="hljs-title">getIMEI</span>(Context context) { TelephonyManager telephonyManager = (TelephonyManager) context .getSystemService(Context.TELEPHONY_SERVICE); <span class="hljs-keyword">return</span> telephonyManager.getDeviceId(); } <span class="hljs-javadoc">/*** * 判断是否有外网连接（普通方法不能判断外网的网络是否连接，比如连接上局域网） * *<span class="hljs-javadoctag"> @return</span> */</span> <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">final</span> <span class="hljs-keyword">boolean</span> <span class="hljs-title">ping</span>() { String result = <span class="hljs-keyword">null</span>; <span class="hljs-keyword">try</span> { String ip = <span class="hljs-string">"www.baidu.com"</span>;<span class="hljs-comment">// ping 的地址，可以换成任何一种可靠的外网</span> Process p = Runtime.getRuntime().exec(<span class="hljs-string">"ping -c 3 -w 100 "</span> + ip);<span class="hljs-comment">// ping网址3次</span> <span class="hljs-comment">// 读取ping的内容，可以不加</span> InputStream input = p.getInputStream(); BufferedReader in = <span class="hljs-keyword">new</span> BufferedReader(<span class="hljs-keyword">new</span> InputStreamReader(input)); StringBuffer stringBuffer = <span class="hljs-keyword">new</span> StringBuffer(); String content = <span class="hljs-string">""</span>; <span class="hljs-keyword">while</span> ((content = in.readLine()) != <span class="hljs-keyword">null</span>) { stringBuffer.append(content); } Log.d(<span class="hljs-string">"------ping-----"</span>, <span class="hljs-string">"result content : "</span> + stringBuffer.toString()); <span class="hljs-comment">// ping的状态</span> <span class="hljs-keyword">int</span> status = p.waitFor(); <span class="hljs-keyword">if</span> (status == <span class="hljs-number">0</span>) { result = <span class="hljs-string">"success"</span>; <span class="hljs-keyword">return</span> <span class="hljs-keyword">true</span>; } <span class="hljs-keyword">else</span> { result = <span class="hljs-string">"failed"</span>; } } <span class="hljs-keyword">catch</span> (IOException e) { result = <span class="hljs-string">"IOException"</span>; } <span class="hljs-keyword">catch</span> (InterruptedException e) { result = <span class="hljs-string">"InterruptedException"</span>; } <span class="hljs-keyword">finally</span> { Log.d(<span class="hljs-string">"----result---"</span>, <span class="hljs-string">"result = "</span> + result); } <span class="hljs-keyword">return</span> <span class="hljs-keyword">false</span>; }}</code><ul 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源码下载地址：https://github.com/gdutxiaoxu/FunAPP.Git
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