Question

我在custom interface

中实施了NetworkReceiver

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

我已将它们都设置在我的Activity和Fragment

上

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

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

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

当触发NetworkReceiver时，它始终是Activity内部的监听器，而不是片段中的监听器

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

编辑：

我把它放在活动的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中你可以找到Fragment并直接调用onStateChange（），这样你就可以获得链式调用（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中的接口仅调用活动而不是片段

2 个答案: