我遇到这个问题有一段时间了,注意到其他一些人也遇到了这个问题,但我无法解决。
问题
我有一个 BroadcastReceiver,它一直在监听互联网变化。因此,每当互联网连接或断开连接时,我都会在 onReceive
中获得状态接收器。
问题是它总是被调用两次。当我连接调试器并在代码中设置断点时,我可以看到它被调用了两次,但我的状态更改代码会执行。当调试器未连接时,在这种情况下,我的状态更改代码根本不会执行。
我的代码
广播接收文件
public class ConnectivityReceiver
extends BroadcastReceiver {
public static ConnectivityReceiverListener connectivityReceiverListener;
public ConnectivityReceiver() {
super();
}
@Override
public void onReceive(Context context, Intent arg1) {
ConnectivityManager cm = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
boolean isConnected = activeNetwork != null
&& activeNetwork.isConnectedOrConnecting();
if (connectivityReceiverListener != null) {
connectivityReceiverListener.onNetworkConnectionChanged(isConnected);
}
}
public static boolean isConnected() {
ConnectivityManager
cm = (ConnectivityManager) MyApplication.getInstance().getApplicationContext()
.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
return activeNetwork != null
&& activeNetwork.isConnectedOrConnecting();
}
public interface ConnectivityReceiverListener {
void onNetworkConnectionChanged(boolean isConnected);
}
}
明显的 Intent 行动
<receiver
android:name=".utils.ConnectivityReceiver"
android:enabled="true">
<intent-filter>
<action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
<action android:name="android.net.wifi.WIFI_STATE_CHANGED" />
</intent-filter>
</receiver>
这里是当我只尝试使用 <action android:name="android.net.wifi.WIFI_STATE_CHANGED" />
时在过滤器中,然后它也来到了onRecieve
两次。当我尝试使用 <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
时,那我就没来onReceive
完全没有。
基础 Activity
@Override
public void onNetworkConnectionChanged(boolean isConnected) {
setNetworkIndicator(isConnected); //THE CODE TO EXECUTE ON STATUS CHANGE
}
我尝试了现有的答案,但它对我不起作用。
最佳答案
我的猜测是 wifi 接收器被调用了两次,因为它在 enabling 状态下被调用了一次,在后续的 enabled 状态下被调用了一次。
在Documentation据称:
Broadcast intent action indicating that Wi-Fi has been enabled, disabled, enabling, disabling, or unknown. One extra provides this state as an int. Another extra provides the previous state, if available.
您可以检查 EXTRA_WIFI_STATE 的值和 EXTRA_PREVIOUS_WIFI_STATE验证是否是这种情况。
因此,为了忽略不需要的连接/断开状态,您可以将您的onReceive()更新为以下内容:
@Override
public void onReceive(Context context, Intent arg1) {
ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
boolean isConnected = false;
if (activeNetwork != null){
if (activeNetwork.getState() == NetworkInfo.State.CONNECTING || activeNetwork.getState() == NetworkInfo.State.DISCONNECTING){
return;
}
isConnected = activeNetwork.isConnected();
}
if (connectivityReceiverListener != null) {
connectivityReceiverListener.onNetworkConnectionChanged(isConnected);
}
}
关于用于互联网连接的 Android BroadcastReceiver 调用了两次,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/49748463/