Android 通过广播获取网络连接的情况

  在做电商的时候，遇到过这样的问题，正在浏览着图片呢。突然网络断了，但是用户还是不知情的情况下。一点提示也没有，而且当网络恢复的时候，图片也没有继续下载显示出来。这样对用户体验肯定是不好的。改进的办法就是通过广播的形式通知当前程序的的网络的连接情况。
1.首先定义一个广播接收者继承自BroadcastReceiver：

public class NetworkConnectReceiver extends BroadcastReceiver {    private NetWorkListener mNetWorkListener;    public NetworkConnectReceiver(NetWorkListener netWorkListener) {        mNetWorkListener = netWorkListener;    }    @Override    public void onReceive(Context context, Intent intent) {        // 监听网络连接，包括wifi和移动数据的打开和关闭        if (ConnectivityManager.CONNECTIVITY_ACTION.equals(intent.getAction())) {            ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);            Print.i("aaa", "CONNECTIVITY_ACTION");            NetworkInfo activeNetwork = manager.getActiveNetworkInfo();            if (activeNetwork != null) { // 连接上网络                if (activeNetwork.isConnected()) {                    if (activeNetwork.getType() == ConnectivityManager.TYPE_WIFI) {                        Log.i("aaa", "当前WiFi连接可用 ");                    } else if (activeNetwork.getType() == ConnectivityManager.TYPE_MOBILE) {                        Log.i("aaa", "当前移动网络连接可用 ");                    }                    mNetWorkListener.networkConnect(true);                } else {                    Log.i("aaa", "当前没有网络连接，请确保你已经打开网络 ");                    mNetWorkListener.networkConnect(false);                }            } else {   // 没有连接上                Print.i("aaa", "当前没有网络连接，请确保你已经打开网络 ");                mNetWorkListener.networkConnect(false);            }        }    }}

2.定义个回调接口

public interface NetWorkListener {    public void networkConnect(boolean b);}

3.注册这个广播AndroidManifest.xml

<receiver android:name=".broadcast.NetworkConnectReceiver"></receiver>

4.在自己需要的界面，动态注册广播

private NetworkConnectReceiver mNetworkConnectReceiver;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.custom_activity2);        instance = this;        registerBroadcast();        initdata();        initView();    }//注册监听网络广播    private void registerBroadcast() {        mNetworkConnectReceiver = new NetworkConnectReceiver(new NetWorkListener() {            @Override            public void networkConnect(boolean b) {                Print.i("aaa", "networkConnect : " + b);                if (!b) {//没有网络                    //do something                } else {//连接网络                    //do something                }            }        });        IntentFilter filter = new IntentFilter();        filter.addAction("android.net.conn.CONNECTIVITY_CHANGE");        filter.addAction("android.net.wifi.WIFI_STATE_CHANGED");        filter.addAction("android.net.wifi.STATE_CHANGE");        registerReceiver(mNetworkConnectReceiver, filter);    }

5.退出当前界面的时候，反注册

@Override    protected void onDestroy() {        super.onDestroy();        unregisterReceiver(mNetworkConnectReceiver);    }

通过测试以上代码可以使用！