链接：（https://www.jianshu.com/p/89e3fbd33964）
一、编写判断网络帮助类 NetUtil
public static int getNetWorkState(Context context) {
//得到连接管理器对象
ConnectivityManager connectivityManager = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetworkInfo = connectivityManager
.getActiveNetworkInfo();
//如果网络连接，判断该网络类型
if (activeNetworkInfo != null && activeNetworkInfo.isConnected()) {
if (activeNetworkInfo.getType() == (ConnectivityManager.TYPE_WIFI)) {
return NETWORK_WIFI;//wifi
} else if (activeNetworkInfo.getType() == (ConnectivityManager.TYPE_MOBILE)) {
return NETWORK_MOBILE;//mobile
}
} else {
//网络异常
return NETWORK_NONE;
}
return NETWORK_NONE;
}
二、编写检测网络变化广播类
public class NetBroadcastReceiver extends BroadcastReceiver {
public NetChangeListener listener = BaseActivity.listener;
@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
// 如果相等的话就说明网络状态发生了变化
Log.i("NetBroadcastReceiver", "NetBroadcastReceiver changed");
if (intent.getAction().equals(ConnectivityManager.CONNECTIVITY_ACTION)) {
int netWorkState = NetUtil.getNetWorkState(context);
// 当网络发生变化，判断当前网络状态，并通过NetEvent回调当前网络状态
if (listener != null) {
listener.onChangeListener(netWorkState);
}
}
}
// 自定义接口
public interface NetChangeListener {
void onChangeListener(int status);
}
}
三、注册广播
<receiver android:name=".network.NetBroadcastReceiver">
<intent-filter>
<action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
</intent-filter>
</receiver>
这里有一个问题，在Android 7.0之静态注册广播的方式被取消了，所以我们这里采用动态注册的方式
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
//实例化IntentFilter对象
IntentFilter filter = new IntentFilter();
filter.addAction("android.net.conn.CONNECTIVITY_CHANGE");
netBroadcastReceiver = new NetBroadcastReceiver();
//注册广播接收
registerReceiver(netBroadcastReceiver, filter);
}
四、创建一个回调当前网络状态值的接口类
// 自定义接口
public interface NetChangeListener {
void onChangeListener(int status);
}
五、并在BaseActivity中实现该接口，广播检测到网络变化时，通过onChangeListener回调当前网络状态至BaseActivity
/**
* 网络变化之后的类型
*/
@Override
public void onChangeListener(int netMobile) {
// TODO Auto-generated method stub
this.netType = netMobile;
Log.i("netType", "netType:" + netMobile);
if (!isNetConnect()) {
showNetDialog();
T.showShort("网络异常，请检查网络");
} else {
hideNetDialog();
T.showShort("网络恢复正常");
}
}
六、这里写了个dialog用来提示网络的变化 showNetDialog() 和 hideNetDialog()分别用来显示和隐藏dialog
/**
* 弹出设置网络框
*/
private void showNetDialog() {
if (alertDialog == null) {
alertDialog = new MyAlertDialog(this).builder().setTitle("网络异常")
.setNegativeButton("取消", new OnClickListener() {
@Override
public void onClick(View view) {
}
}).setPositiveButton("设置", new OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(Settings.ACTION_WIFI_SETTINGS);
startActivity(intent);
}
}).setCancelable(false);
}
alertDialog.show();
showMsg("网络异常，请检查网络");
}
七、通过Intent跳转到网络设置页面
Intent intent = new Intent(Settings.ACTION_WIFI_SETTINGS);
startActivity(intent);
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