Android_判断是否有可用网络

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//配置权限<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /><uses-permission android:name="android.permission.INTERNET" />

//Activity里的代码

package new_project.project;import android.content.Context;import android.net.ConnectivityManager;import android.net.NetworkInfo;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.widget.Toast;public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        boolean b = isNetworkAvailable(MainActivity.this);        if (b) {            Toast.makeText(MainActivity.this, "当前有可用网络", Toast.LENGTH_LONG).show();        } else {            Toast.makeText(MainActivity.this, "当前无可用网络", Toast.LENGTH_LONG).show();        }    }    /**     * 检查当前网络是否可用     */    public static boolean isNetworkAvailable(Context context) {        ConnectivityManager cm = (ConnectivityManager) context                .getSystemService(Context.CONNECTIVITY_SERVICE);        if (cm == null) {        } else {            //如果仅仅是用来判断网络连接            //则可以使用 cm.getActiveNetworkInfo().isAvailable();            NetworkInfo[] info = cm.getAllNetworkInfo();            if (info != null) {                for (int i = 0; i < info.length; i++) {                    if (info[i].getState() == NetworkInfo.State.CONNECTED) {                        return true;                    }                }            }        }        return false;    }    /**     * 第二种方法     *///    public boolean isNetworkAvailable(Context context) {//             if (context != null) {//                     ConnectivityManager mConnectivityManager = (ConnectivityManager) context//                             .getSystemService(Context.CONNECTIVITY_SERVICE);//                     NetworkInfo mNetworkInfo = mConnectivityManager.getActiveNetworkInfo();//                     if (mNetworkInfo != null) {//                             return mNetworkInfo.isAvailable();//                         }//                 }//             return false;//         }}

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