如何访问清单中声明的​​广播接收器并更改一些 属性

How to access broadcast receiver declared in manifest and change some property

我在AndroidManifest.xml中声明了一个接收器:

    <receiver android:name=".receivers.ConnectionUpdateReceiver">
        <intent-filter>
            <action android:name="android.net.conn.CONNECTIVITY_CHANGE"/>
        </intent-filter>
    </receiver>



public class ConnectionUpdateReceiver extends BroadcastReceiver {
    private Listener listener;

    public void setListener(Listener listener) {
        this.listener = listener;
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        final NetworkInfo networkInfo = manager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
        if (networkInfo != null && networkInfo.isConnected()) {
            if (listener != null) {
                listener.onWifiConnected(networkInfo);
            }
        }
    }

    public interface Listener {
        void onWifiConnected(NetworkInfo networkInfo);
    }
}

我必须为此注册一个监听器 class。但是我不知道如何在我的 Activity class 中访问它来设置监听器 属性。

我尝试在运行时以通常的方式在我的 activity 的 onResume 中注册此接收器:

registerReceiver(connectionUpdateReceiver, new IntentFilter(...));

但我不知道将什么传递给 IntenetFilter 构造函数,因为

android.net.conn.CONNECTIVITY_CHANGE 

那里无法访问。

要侦听网络更改事件,您的 activity 必须注册侦听 CONNECTIVITY_CHANGE 的广播接收器:

例如:

public void onCreate(Bundle savedInstanceState) {

    registerReceiver(new BroadcastReceiver() {  

        public void onReceive(Context context, Intent intent) {

            Log.i(TAG, "Hey, net?");
        }}, new IntentFilter("android.net.conn.CONNECTIVITY_CHANGE"));
}

希望对您的问题有所支持。

I have to register a listener to this class

这是不可能的,因为在 Android 发送并处理匹配的广播之前,没有清单注册 BroadcastReceiver 的实例。

I tried to register this receiver at runtime in the usually way in onResume of my activity:

只有去掉清单条目才有意义。

But I don't know what to pass to IntenetFilter constructor, since android.net.conn.CONNECTIVITY_CHANGE is not accessible there.

欢迎您将"android.net.conn.CONNECTIVITY_CHANGE"传递给IntentFilter构造函数。它也可以作为 ConnectivityManager.CONNECTIVITY_ACTION.