连续检查Android网络
连续检查Android网络
提问于 2013-11-14 05:50:58
我想用这种方式不断地验证Android系统的网络，但是我认为这种形式是不正确的，如果wifi或其他网络上的连接可用，我的服务应该更新。
public class ObjService extends Service{
private final static int NOTIFICATION=1;
public static boolean process;
private NotificationManager state;
private NotificationCompat.Builder objBuilder;
public void onCreate(){
process=true;
state=(NotificationManager)getSystemService(NOTIFICATION_SERVICE);
objBuilder = new NotificationCompat.Builder(this)
.setContentTitle("Title")
.setLargeIcon(BitmapFactory.decodeResource(getResources(), R.drawable.launchimg))
.setSmallIcon(R.drawable.notification_img);
Thread checker=new Thread(){//1
public void run(){//2
while (process){//3
if (verifyConnection()){//4
updateNotificationService("Service is available");
}else{
updateNotificationService("Service is not available");
}//4
try{
Thread.sleep(6000);
}catch(InterruptedException e){
//..printLog..
}
}//3
};//2
};//1
checker.start();
.
.
.我的函数verifyConnection()是：
public boolean verifyConnection() {
boolean flag = true;
ConnectivityManager connec = (ConnectivityManager)this.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo[] net = connec.getAllNetworkInfo();
if (!net[0].isAvailable() && !net[1].isAvailable())
{
flag = false;
}
return flag;
}updateNotificationService()是：
public void updateNotificacionService(String arg){
objBuilder.setContentText(arg)
.setWhen(System.currentTimeMillis());
state.notify(NOTIFICATION, objBuilder.build());
}回答 2
Stack Overflow用户
回答已采纳
发布于 2013-11-14 06:30:32
尝试下面的代码来侦听连接是否存在，如果连接状态发生变化，则通知更改，
public class NetworkStateReceiver extends BroadcastReceiver {
public void onReceive(Context context, Intent intent) {
super.onReceive(context, intent);
Log.d("app","Network connectivity change");
if(intent.getExtras()!=null) {
NetworkInfo ni=(NetworkInfo) intent.getExtras().get(ConnectivityManager.EXTRA_NETWORK_INFO);
if(ni!=null && ni.getState()==NetworkInfo.State.CONNECTED) {
Log.i("app","Network "+ni.getTypeName()+" connected");
}
}
if(intent.getExtras().getBoolean(ConnectivityManager.EXTRA_NO_CONNECTIVITY,Boolean.FALSE)) {
Log.d("app","There's no network connectivity");
}
}
}然后作为清单，
<receiver android:name=".NetworkStateReceiver">
<intent-filter>
<action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
</intent-filter>
</receiver>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />参考资料：Internet侦听器Android示例
Stack Overflow用户
发布于 2020-03-12 17:55:21
Android7.0(APILevel24)对广播设置了限制，如背景优化中所述。Android8.0(APILevel26)使这些限制更加严格。 应用程序可以在运行时使用
Context.registerReceiver()注册任何广播的接收器，无论是隐式广播还是显式广播。
文档参考文献。
因此，下面是一个实用工具类，它利用上下文注册的BroadcastReceiver和LifeCycleObserver来实现单一责任原则
class ConnectionUtil implements LifecycleObserver {
private ConnectivityManager mConnectivityMgr;
private Context mContext;
private NetworkStateReceiver mNetworkStateReceiver;
interface ConnectionStateListener {
void onAvailable(boolean isAvailable);
}
ConnectionUtil(Context context) {
mContext = context;
mConnectivityMgr = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
((AppCompatActivity) mContext).getLifecycle().addObserver(this);
}
void onInternetStateListener(ConnectionStateListener listener) {
mNetworkStateReceiver = new NetworkStateReceiver(listener);
IntentFilter intentFilter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);
// Registering the Context Registered Receiver
mContext.registerReceiver(mNetworkStateReceiver, intentFilter);
}
@OnLifecycleEvent(Lifecycle.Event.ON_DESTROY)
public void onDestroy() {
// Removing lifecycler owner observer
((AppCompatActivity) mContext).getLifecycle().removeObserver(this);
// Unregistering the Context Registered Receiver
if (mNetworkStateReceiver != null)
mContext.unregisterReceiver(mNetworkStateReceiver);
}
public class NetworkStateReceiver extends BroadcastReceiver {
ConnectionStateListener mListener;
public NetworkStateReceiver(ConnectionStateListener listener) {
mListener = listener;
}
@Override
public void onReceive(Context context, Intent intent) {
if (intent.getExtras() != null) {
NetworkInfo activeNetworkInfo = mConnectivityMgr.getActiveNetworkInfo();
if (activeNetworkInfo != null && activeNetworkInfo.getState() == NetworkInfo.State.CONNECTED) {
// Connected to the internet
mListener.onAvailable(true);
} else if (intent.getBooleanExtra(ConnectivityManager.EXTRA_NO_CONNECTIVITY, Boolean.FALSE)) {
// Not connected to the internet
mListener.onAvailable(false);
}
}
}
}
}宣言许可
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />使用：
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ConnectionUtil mConnectionMonitor = new ConnectionUtil(this);
mConnectionMonitor.onInternetStateListener(new ConnectionUtil.ConnectionStateListener() {
@Override
public void onAvailable(boolean isAvailable) {
if(isAvailable)
Toast.makeText(MainActivity.this, "Connected", Toast.LENGTH_SHORT).show();
else
Toast.makeText(MainActivity.this, "Disconnected", Toast.LENGTH_SHORT).show();
}
});
}
}注意:从API 29开始就不再推荐NetworkInfo了，您可以使用ConnectivityManager.NetworkCallback及其onAvailable() & onLost()回调来实现相同的目的，而不是使用BroadcastReceiver。这个答案可以指导实现这一目的。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/19970515
复制相关文章
相似问题
腾讯云开发者
