BroadcastReceiver 中的接口仅调用 activity 而不是片段

Question

我在 NetworkReceiver

中实现了 custom interface

public interface onNetworkStateChanged {
    void onStateChange(int state);
}

我已经在 Activity 和 Fragment

上设置了它们

network = new NetworkReceiver();
network.setOnNetworkStateChanged(this);

---------------------------------------------

@Override
public void onStateChange(int state) {
    if (state == NetworkReceiver.STATE_ON) {
        networkState = state;
    } else {
        networkState = state;
    }
}

并且当 NetworkReceiver 被触发时，它总是 Activity 中的侦听器将被调用，而不是片段中的侦听器

有人有想法吗？或者我需要在我的片段中实现一个 customCallback，activity 将触发调用片段？

编辑：

我把它放在 Activity

的 onStateChange 上

Fragment f = getFragmentManager().findFragmentByTag(Utils.FEED_FRAGMENT);
if (f instanceof FeedFragment) {
    ((FeedFragment) f).onStateChange(state);
}

Answer 1

很难说，因为你的代码不完整。您应该将片段注册为侦听器，似乎 setOnNetworkStateChanged(this) 使用 Activity 实例。

或者在 Activity 中您可以找到 Fragment 并直接调用 onStateChange()，因此您将获得链式调用（与 onOptionsItemSelected 相同的机制）。

Answer 2

//create a public method setNetworkChageListner() inside NetworkReceiver

public void setNetworkChageListner(onNetworkStateChanged onNetwokChanged){
  this.onNetworkChanged=onNetworkChanged
}
/*check the global variable onNetworkChanged is null when you trigger the method onStateChange(int state)*/

//inside your fragment use receiver static variable of activity
netwok_receiver_static_variable.setNetworkChageListner(new NetworkReceiver.onNetworkStateChanged () {
            @Override
            public void onStateChange() {
                //do operation
            }
        })

BroadcastReceiver 中的接口仅调用 activity 而不是片段

Interface in BroadcastReceiver call only activity instead of fragment

android

interface

broadcastreceiver

android-fragments

android-activity