android 检查网络是否连接了

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 代码如下

 

/**

 * 

 * @param activity

 * @return boolean return true if the application can access the internet

 */

public static boolean hasInternet(Activity activity) {

ConnectivityManager manager = (ConnectivityManager) activity

.getSystemService(Context.CONNECTIVITY_SERVICE);

NetworkInfo info = manager.getActiveNetworkInfo();

if (info == null || !info.isConnected()) {

return false;

}

if (info.isRoaming()) {

// here is the roaming option you can change it if you want to

// disable internet while roaming, just return false

return true;

}

return true;

 

}

 

需要在AndroidManifest.xml中
增加权限：

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

 

评论

4 楼 left 2009-12-05  

<div class="quote_title">从程序看 if (info.isRoaming())  这句可能可能抛出 NPE的  <br>
</div>
<div class="quote_title">80x86 写道</div>
<div class="quote_div">
<p><span style="line-height: 18px; font-family: Verdana,Arial;">
</span></p>
<p> 代码如下</p>
<p> </p>
<p>/**</p>
<p><span style="white-space: pre;"> </span> * </p>
<p><span style="white-space: pre;"> </span> * @param activity</p>
<p><span style="white-space: pre;"> </span> * @return boolean return true if the application can access the internet</p>
<p><span style="white-space: pre;"> </span> */</p>
<p><span style="white-space: pre;"> </span>public static boolean hasInternet(Activity activity) {</p>
<p><span style="white-space: pre;"> </span>ConnectivityManager manager = (ConnectivityManager) activity</p>
<p><span style="white-space: pre;"> </span>.getSystemService(Context.CONNECTIVITY_SERVICE);</p>
<p><span style="white-space: pre;"> </span>NetworkInfo info = manager.getActiveNetworkInfo();</p>
<p><span style="white-space: pre;"> </span>if (info == null || !info.isConnected()) {</p>
<p><span style="white-space: pre;"> </span>return false;</p>
<p><span style="white-space: pre;"> </span>}</p>
<p><span style="white-space: pre;"> </span>if (info.isRoaming()) {</p>
<p><span style="white-space: pre;"> </span>// here is the roaming option you can change it if you want to</p>
<p><span style="white-space: pre;"> </span>// disable internet while roaming, just return false</p>
<p><span style="white-space: pre;"> </span>return true;</p>
<p><span style="white-space: pre;"> </span>}</p>
<p><span style="white-space: pre;"> </span>return true;</p>
<p> </p>
<p><span style="white-space: pre;"> </span>}</p>
<p> </p>
<p>需要在AndroidManifest.xml中<br>增加权限：</p>
<p>&lt;uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"&gt;&lt;/uses-permission&gt;</p>
<p> </p>
</div>
<p> </p>

3 楼 nj_first 2009-12-04  

楼主有研究过怎样改变当前正在使用的APN吗？
通过程序切换！

2 楼 sunburst 2009-12-03  

差点一不小心点击了。。。。

1 楼 lordhong 2009-12-01  

上面一个链接算是软性广告吗?