Android 7.0 监听网络变化的示例代码

2023-09-15 02:11:05 55

Android7.0前，Android系统前网络切换时，会发广播，业务只要监听广播即可。

publicclassNetChangeReceiverextendsBroadcastReceiver{

privatestaticfinalStringANDROID_NET_CHANGE_ACTION="android.net.conn.CONNECTIVITY_CHANGE";

@Override
publicvoidonReceive(Contextcontext,Intentintent){
if(intent.getAction().equalsIgnoreCase(ANDROID_NET_CHANGE_ACTION)){
Toast.makeText(context,"NetChanged",Toast.LENGTH_SHORT).show();
}
}
}

上面代码，在Android7.0设备前，当网络切换时，能收到消息。而在Android7.0及以上设备，则无法收到。

Android7.0行为变更上明确说明

Android7.0移除了三项隐式广播，因为隐式广播会在后台频繁启动已注册侦听这些广播的应用。删除这些广播可以显著提升设备性能和用户体验。

为缓解这些问题，Android7.0应用了以下优化措施：

面向Android7.0开发的应用不会收到CONNECTIVITY_ACTION广播，即使它们已有清单条目来请求接受这些事件的通知。在前台运行的应用如果使用BroadcastReceiver请求接收通知，则仍可以在主线程中侦听CONNECTIVITY_CHANGE。
应用无法发送或接收ACTION_NEW_PICTURE或ACTION_NEW_VIDEO广播。此项优化会影响所有应用，而不仅仅是面向Android7.0的应用。

解决办法

1.大家都知道，注册广播有两种方式，一种是在AndroidManifest.xml中，另一种通过register方法。

Android文档中描述，通过在AndroidManifest.xml中注册方式，App在前后台都无法接收到广播。而通过register的方式，当App在运行时，是可以接收到广播的。

Note:ABroadcastReceiverregisteredwithContext.registerReceiver()continuestoreceivethesebroadcastswhiletheappisrunning.

publicclassMainActivityextendsActivity{
privateNetChangeReceivernetChangeReceiver;
@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

netChangeReceiver=newNetChangeReceiver();
registerReceiver(netChangeReceiver,newIntentFilter("android.net.conn.CONNECTIVITY_CHANGE"));
}

@Override
protectedvoidonDestroy(){
super.onDestroy();
unregisterReceiver(netChangeReceiver);
}
}

2.提供了一种更稳定的方式

MonitoringNetworkConnectivityWhiletheAppisRunning
AppsthatarerunningcanstilllistenforCONNECTIVITY_CHANGEwitharegisteredBroadcastReceiver.However,theConnectivityManagerAPIprovidesamorerobustmethodtorequestacallbackonlywhenspecifiednetworkconditionsaremet.

NetworkRequestobjectsdefinetheparametersofthenetworkcallbackintermsofNetworkCapabilities.YoucreateNetworkRequestobjectswiththeNetworkRequest.Builderclass.registerNetworkCallback()thenpassestheNetworkRequestobjecttothesystem.Whenthenetworkconditionsaremet,theappreceivesacallbacktoexecutetheonAvailable()methoddefinedinitsConnectivityManager.NetworkCallbackclass.

TheappcontinuestoreceivecallbacksuntileithertheappexitsoritcallsunregisterNetworkCallback().

publicclassMainActivityextendsActivity{
privateConnectivityManager.NetworkCallbacknetworkCallback;
privateConnectivityManagerconnectivityManager;
@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
networkCallback=newNetworkCallbackImpl();
NetworkRequest.Builderbuilder=newNetworkRequest.Builder();
NetworkRequestrequest=builder.build();
connectivityManager=(ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
connectivityManager.registerNetworkCallback(request,networkCallback);
}

@Override
protectedvoidonDestroy(){
super.onDestroy();
connectivityManager.unregisterNetworkCallback(networkCallback);
}
privateclassNetworkCallbackImplextendsConnectivityManager.NetworkCallback{
@Override
publicvoidonAvailable(Networknetwork){
super.onAvailable(network);
Toast.makeText(getBaseContext(),"onAvailable",Toast.LENGTH_SHORT).show();
}

@Override
publicvoidonLosing(Networknetwork,intmaxMsToLive){
super.onLosing(network,maxMsToLive);
Toast.makeText(getBaseContext(),"onLosing",Toast.LENGTH_SHORT).show();
}

@Override
publicvoidonLost(Networknetwork){
super.onLost(network);
Toast.makeText(getBaseContext(),"onLost",Toast.LENGTH_SHORT).show();
}

@Override
publicvoidonCapabilitiesChanged(Networknetwork,NetworkCapabilitiesnetworkCapabilities){
super.onCapabilitiesChanged(network,networkCapabilities);
Toast.makeText(getBaseContext(),"onCapabilitiesChanged",Toast.LENGTH_SHORT).show();
}

@Override
publicvoidonLinkPropertiesChanged(Networknetwork,LinkPropertieslinkProperties){
super.onLinkPropertiesChanged(network,linkProperties);
Toast.makeText(getBaseContext(),"onLinkPropertiesChanged",Toast.LENGTH_SHORT).show();
}
}
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持毛票票。

Android 7.0 监听网络变化的示例代码

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