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我正在关注Android 的 WiFi 直接指南,因为我正在构建一个使用 WiFi 直接的应用程序。我也有2节课;一种称为ClientReceive,一种称为HostSend。客户端发起与主机的连接,然后主机将数据推送到客户端。

当我开始开始我的 WiFi 直接设置时,我制作了一个广播接收器来监听状态变化:

package com.mgamerzproductions.wifidirecttest;

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.NetworkInfo;
import android.net.wifi.p2p.WifiP2pDevice;
import android.net.wifi.p2p.WifiP2pManager;
import android.net.wifi.p2p.WifiP2pManager.Channel;
import android.net.wifi.p2p.WifiP2pManager.PeerListListener;
import android.util.Log;

/**
 * A BroadcastReceiver that notifies of important wifi p2p events.
 */
public class WiFiDirectBroadcastReceiver extends BroadcastReceiver {

    private WifiP2pManager manager;
    private Channel channel;
    private WiFiActivity activity;

    /**
     * @param manager WifiP2pManager system service
     * @param channel Wifi p2p channel
     * @param Host class (HostSend) for this constructor.
     */
    public WiFiDirectBroadcastReceiver(WifiP2pManager manager, Channel channel,
            HostSend activity) {
        super();
        this.manager = manager;
        this.channel = channel;
        this.activity = activity;
    }

    /**
     * @param manager WifiP2pManager system service
     * @param channel Wifi p2p channel
     * @param activity activity associated with the receiver
     */
    public WiFiDirectBroadcastReceiver(WifiP2pManager manager, Channel channel,
            ClientReceive activity) {
        super();
        this.manager = manager;
        this.channel = channel;
        this.activity = activity;
    }

    /*
     * (non-Javadoc)
     * @see android.content.BroadcastReceiver#onReceive(android.content.Context,
     * android.content.Intent)
     */
    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        if (WifiP2pManager.WIFI_P2P_STATE_CHANGED_ACTION.equals(action)) {

            // UI update to indicate wifi p2p status.
            int state = intent.getIntExtra(WifiP2pManager.EXTRA_WIFI_STATE, -1);
            if (state == WifiP2pManager.WIFI_P2P_STATE_ENABLED) {
                // Wifi Direct mode is enabled
                activity.setIsWifiP2pEnabled(true);
            } else {
                activity.setIsWifiP2pEnabled(false);
                //activity.resetData();

            }
            Log.d(Launch.APPTAG, "P2P state changed - " + state);
        } else if (WifiP2pManager.WIFI_P2P_PEERS_CHANGED_ACTION.equals(action)) {

            // request available peers from the wifi p2p manager. This is an
            // asynchronous call and the calling activity is notified with a
            // callback on PeerListListener.onPeersAvailable()
            if (manager != null) {
                /*manager.requestPeers(channel, (PeerListListener) activity.getFragmentManager()
                        .findFragmentById(R.id.frag_list));*/
            }
            Log.d(Launch.APPTAG, "P2P peers changed");
        } else if (WifiP2pManager.WIFI_P2P_CONNECTION_CHANGED_ACTION.equals(action)) {

            if (manager == null) {
                return;
            }

            NetworkInfo networkInfo = (NetworkInfo) intent
                    .getParcelableExtra(WifiP2pManager.EXTRA_NETWORK_INFO);

            if (networkInfo.isConnected()) {

                // we are connected with the other device, request connection
                // info to find group owner IP

                HostSend connectionListener = activity;
                manager.requestConnectionInfo(channel, connectionListener);
            } else {
                // It's a disconnect
                activity.resetData();
            }
        } else if (WifiP2pManager.WIFI_P2P_THIS_DEVICE_CHANGED_ACTION.equals(action)) {
            /*DeviceListFragment fragment = (DeviceListFragment) activity.getFragmentManager()
                    .findFragmentById(R.id.frag_list);
            fragment.updateThisDevice((WifiP2pDevice) intent.getParcelableExtra(
                    WifiP2pManager.EXTRA_WIFI_P2P_DEVICE));*/

        }
    }
}

但是,我有另一个类 ClientReceive,它也需要接收器,因为两个设备都需要直接设置 WiFi 并使用回调(我认为这就是所谓的回调?活动的回调?)来建立连接。这两个类都是 WiFi 活动的子类,它本质上是一个空类,它仅使用 super.methodname() 覆盖 Activity 中的一些方法,以便孩子可以访问它。IT 有一些与 WiFi 相关的额外方法。我创建它是为了避免强制转换,但它不起作用,因为子类有不同的方法,如果我使用 WiFiActivity 而不是它的子类,我不能使用子类方法。

有没有办法正确地做到这一点?我的代码正在进行中(这就是为什么它有点难看),但我没有想法。我有 2 个构造函数,一个来自每个设备上的每个活动(一个是主机设备,一个是客户端设备)。我想要做的是在两个类之间共享这个类,但我不知道如何正确地转换 HostSend connectionListener (HostSend) 活动,因为我不知道如何转换这样的项目。

谢谢。对不起,冗长的解释。

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