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转载原文地址:http://www.cnblogs.com/renqingping/archive/2012/10/18/Net.html
当前有可用网络,如下图:
当前没有可用网络,如下图:
实现步骤:
1、获取ConnectivityManager对象
Context context = activity.getApplicationContext(); // 获取手机所有连接管理对象(包括对wi-fi,net等连接的管理) ConnectivityManager connectivityManager = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
2、获取NetworkInfo对象
// 获取NetworkInfo对象 NetworkInfo[] networkInfo = connectivityManager.getAllNetworkInfo();
3、判断当前网络状态是否为连接状态
if (networkInfo[i].getState() == NetworkInfo.State.CONNECTED) { return true; }
4、在AndroidManifest.xml中添加访问当前网络状态权限
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>
代码如下:
public class ClassTestDemoActivity extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); if (isNetworkAvailable(ClassTestDemoActivity.this)) { Toast.makeText(getApplicationContext(), "当前有可用网络!", Toast.LENGTH_LONG).show(); } else { Toast.makeText(getApplicationContext(), "当前没有可用网络!", Toast.LENGTH_LONG).show(); } } /** * 检查当前网络是否可用 * * @param context * @return */ public boolean isNetworkAvailable(Activity activity) { Context context = activity.getApplicationContext(); // 获取手机所有连接管理对象(包括对wi-fi,net等连接的管理) ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE); if (connectivityManager == null) { return false; } else { // 获取NetworkInfo对象 NetworkInfo[] networkInfo = connectivityManager.getAllNetworkInfo(); if (networkInfo != null && networkInfo.length > 0) { for (int i = 0; i < networkInfo.length; i++) { System.out.println(i + "===状态===" + networkInfo[i].getState()); System.out.println(i + "===类型===" + networkInfo[i].getTypeName()); // 判断当前网络状态是否为连接状态 if (networkInfo[i].getState() == NetworkInfo.State.CONNECTED) { return true; } } } } return false; } }
控制台打印出的结果:
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原文地址:http://www.cnblogs.com/xiguameng/p/5743466.html