• 需要相关权限

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

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

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

   

• 在界面中，存在一个按钮，单击按钮的情况下，判断当前的网络连接状态，分别在连接网络状态和未连接网络状态下，提示相关信息。代码如下：

public class MainActivity extends Activity {

    private Button button;//对应的按钮

    private ConnectivityManager connetivityManager;//

    private NotificationManager notificationManager;// 通知用户网络状况

    private BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {

        @Override

        public void onReceive(Context contex, Intent intent) {

            // TODO Auto-generated method stub

            // 网络状况

            NetworkInfo mobileInfo = connetivityManager

                    .getNetworkInfo(ConnectivityManager.TYPE_MOBILE);

            NetworkInfo wifiInfo = connetivityManager

                    .getNetworkInfo(ConnectivityManager.TYPE_WIFI);

            Notification.Builder builder = new Notification.Builder(

                    MainActivity.this);

            builder.setContentTitle("提示信息");

            builder.setSmallIcon(R.drawable.ic_launcher);

            if (!mobileInfo.isConnected() && !wifiInfo.isConnected()) {

                builder.setContentText("网络状态有异常");

            } else {

                builder.setContentText("网络正常");

            }

            notificationManager.notify(1001, builder.build());

        }

    };

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        // TODO Auto-generated method stub

        super.onCreate(savedInstanceState);

        setContentView(R.layout.mainactivity);

        button = (Button) findViewById(R.id.button1);

        button.setOnClickListener(new OnClickListener() {

            @Override

            public void onClick(View arg0) {

                // TODO Auto-generated method stub

                IntentFilter intentFilter = new IntentFilter();

                intentFilter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);

                registerReceiver(broadcastReceiver, intentFilter);

                connetivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);

                notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

            }

        });

    }

    // 卸载广播

    @Override

    protected void onPause() {

        // TODO Auto-generated method stub

        super.onPause();

        if (broadcastReceiver != null) {

            unregisterReceiver(broadcastReceiver);

        }

    }

}