Android 网络状态变更的广播

来源：互联网发布：变形相机是什么软件编辑：程序博客网时间：2024/06/06 00:28
public class MainActivity extends AppCompatActivity {    private IntentFilter intentFilter;    private NetworkChangeRexeiver networkChangeRexeiver;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        intentFilter=new IntentFilter();        //"android.net.conn.CONNECTIVITY_CHANGE":当网络变化时，系统发出的值为"android.net.conn.CONNECTIVITY_CHANGE"的广播        intentFilter.addAction("android.net.conn.CONNECTIVITY_CHANGE");        networkChangeRexeiver=new NetworkChangeRexeiver();        registerReceiver(networkChangeRexeiver,intentFilter);    }    @Override    protected void onDestroy() {        super.onDestroy();        //取消注册        unregisterReceiver(networkChangeRexeiver);    }    class NetworkChangeRexeiver extends BroadcastReceiver{        @Override        public void onReceive(Context context, Intent intent) {            //ConnectivityManager系统服务类，专门用于管理网络连接的            ConnectivityManager connectivityManager= (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);            NetworkInfo networkInfo=connectivityManager.getActiveNetworkInfo();            if (networkInfo!=null&&networkInfo.isAvailable()){                Toast.makeText(context,"network is available",Toast.LENGTH_LONG).show();            }else {                Toast.makeText(context,"network is unavailable",Toast.LENGTH_LONG).show();            }        }    }}

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