如何将结果数据从广播接收器发送到活动

问题描述

我有一个调用广播接收器的活动.广播接收器等待并收听 GPS.当侦听器获得新点时，我想将该新点发送到 Activity.如何将数据从广播接收器发送到活动?

I have an Activity that calls a Broadcast Receiver. The Broadcast Receiver waits and listens to GPS. When the listener gets the new point I want to send that new point to Activity. How can I send data from Broadcast Receiver to Activity?

我的活动中需要一个侦听器，等待广播接收器的响应.我该怎么做?

I need a listener in my Activity waiting for response from Broadcast Receiver. How can I do that?

推荐答案

我为我的接收器定义了一个监听器并在活动中使用它，现在它运行得很好.以后有没有可能出问题?

I defined a listener for my receiver and use it in activity and it is running perfect now. Is it possible to happen any problem later?

public interface OnNewLocationListener {
public abstract void onNewLocationReceived(Location location);

}

在我的接收器类中，它被命名为 ReceiverPositioningAlarm:

in My receiver class wich is named as ReceiverPositioningAlarm:

// listener ----------------------------------------------------

static ArrayList<OnNewLocationListener> arrOnNewLocationListener =
        new ArrayList<OnNewLocationListener>();

// Allows the user to set an Listener and react to the event
public static void setOnNewLocationListener(
        OnNewLocationListener listener) {
    arrOnNewLocationListener.add(listener);
}

public static void clearOnNewLocationListener(
        OnNewLocationListener listener) {
    arrOnNewLocationListener.remove(listener);
}

// This function is called after the new point received
private static void OnNewLocationReceived(Location location) {
    // Check if the Listener was set, otherwise we'll get an Exception when
    // we try to call it
    if (arrOnNewLocationListener != null) {
        // Only trigger the event, when we have any listener
        for (int i = arrOnNewLocationListener.size() - 1; i >= 0; i--) {
            arrOnNewLocationListener.get(i).onNewLocationReceived(
                    location);
        }
    }
}

并在我的一种活动方法中:

and in one of my activity's methods:

OnNewLocationListener onNewLocationListener = new OnNewLocationListener() {
        @Override
        public void onNewLocationReceived(Location location) {
            // do something

            // then stop listening
            ReceiverPositioningAlarm.clearOnNewLocationListener(this);
        }
    };

    // start listening for new location
    ReceiverPositioningAlarm.setOnNewLocationListener(
            onNewLocationListener);

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