LocalBroadcastManager 能否检测到 WifiManager.NETWORK_STATE_CHANGED_ACTION 变化？

Question

我想使用 BroadcastReceiver 通知我的 Activity 任何 Wifi 连接更改。由于此广播在应用程序内，我正在尝试使用更高效的 LocalBroadcastManager 对象。

但是无论我做什么，BroadcastReceiver.onReceive() 方法都不会触发。我可能没有正确连接它，或者我正在侦听的 WifiManager.NETWORK_STATE_CHANGED_ACTION 操作无法针对 LocalBroadcastManager 注册？任何帮助或澄清将不胜感激。

这是我的 Activity class 的示例，其中包含所有逻辑。

public class MyActivity extends ActionBarActivity {

private BroadcastReceiver wifiReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        if (action.equals(WifiManager.NETWORK_STATE_CHANGED_ACTION))
        {
            // Do something
        }
    }
};

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_my);

    IntentFilter wifiStatusIntentFilter = new IntentFilter();
    wifiStatusIntentFilter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);
    wifiStatusIntentFilter.addAction(WifiManager.WIFI_STATE_CHANGED_ACTION);
    LocalBroadcastManager.getInstance(this).registerReceiver(wifiReceiver, wifiStatusIntentFilter);
}

protected void onPause() {
    super.onPause();
    LocalBroadcastManager.getInstance(this).unregisterReceiver(wifiReceiver);
}

protected void onResume() {
    super.onResume();

    IntentFilter wifiStatusIntentFilter = new IntentFilter();
    wifiStatusIntentFilter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);
    LocalBroadcastManager.getInstance(this).registerReceiver(wifiReceiver, wifiStatusIntentFilter);
}

}

当我打开和关闭手机上的 wifi，或者进入和离开 wifi 范围时，永远不会触发 onReceive() 方法。

Answer 1

Since this broadcast is within the application I'm trying to use the more efficient LocalBroadcastManager object.

这仅适用于您通过LocalBroadcastManager发送的广播。它不适用于系统广播，尤其是其他进程发送的广播。

perhaps the WifiManager.NETWORK_STATE_CHANGED_ACTION action I'm listening for cannot be registered against a LocalBroadcastManager?

正确。

Answer 2

您无法使用 LocalBroadcastManager 接收 WifiManager.NETWORK_STATE_CHANGED_ACTION。 LocalBroadcastManager 仅在您的进程内工作。

Helper to register for and send broadcasts of Intents to local objects within your process. This is has a number of advantages over sending global broadcasts with sendBroadcast(Intent):

You know that the data you are broadcasting won't leave your app, so don't need to worry about leaking private data.

It is not possible for other applications to send these broadcasts to your app, so you don't need to worry about having security holes they can exploit.

It is more efficient than sending a global broadcast through the system.

你应该使用 Context 的 registerReceiver

LocalBroadcastManager 能否检测到 WifiManager.NETWORK_STATE_CHANGED_ACTION 变化？

Can LocalBroadcastManager detect WifiManager.NETWORK_STATE_CHANGED_ACTION changes?

android

android-intent

wifimanager

localbroadcastmanager