判断当前网络是否可用

来源：互联网发布：淘宝网官网首页手机版编辑：程序博客网时间：2024/05/17 06:11

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"/>

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;}

}

0 0