Java 将值从broadcastreceiver类传递到wifi direct中的主活动

我想将WiFiDirectBroadcastReceiver中字符串变量result中的值发送到WiFiDirectActivity，并尝试按中所示进行操作

但是，当我运行应用程序时，它一直在搜索同龄人。当我评论这些添加的行（WiFiDirectBroadcastReceiver的最后3行）时，它工作正常

添加了WiFiDirectBroadcastReceiver中的onReceive函数和WiFiDirectActivity中的onResume（）代码

如何将该值传递给WiFiDirectActivity？我错过了什么

WiFiDirectBroadcastReceiver.java

public void onReceive(Context context, Intent intent) {
    String action = intent.getAction();

      //if (MyIntentService.ACTION_MyIntentService.equals(action))
     // {
        //result = intent.getStringExtra(MyIntentService.EXTRA_KEY_OUT);
          result = "hello";
      //}

    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(WiFiDirectActivity.TAG, "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(WiFiDirectActivity.TAG, "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

            DeviceDetailFragment fragment = (DeviceDetailFragment) activity
                    .getFragmentManager().findFragmentById(R.id.frag_detail);
            manager.requestConnectionInfo(channel, fragment);
            //fragment.peerCountInfo=result;
            //fragment.peerCt = peerCountFromDlist;
            //fragment.peerNm = peerNameFromDlist;
        } 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));
        //peerCountFromDlist = fragment.peerTot;
        //peerNameFromDlist = fragment.deviceid;

    }

    intent.putExtra("message",result);
    intent.setClass(context, WiFiDirectActivity.class);
    context.startActivity(intent);
}

WiFiDirectActivity.java

public void onReceive(Context context, Intent intent) {
    String action = intent.getAction();

      //if (MyIntentService.ACTION_MyIntentService.equals(action))
     // {
        //result = intent.getStringExtra(MyIntentService.EXTRA_KEY_OUT);
          result = "hello";
      //}

    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(WiFiDirectActivity.TAG, "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(WiFiDirectActivity.TAG, "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

            DeviceDetailFragment fragment = (DeviceDetailFragment) activity
                    .getFragmentManager().findFragmentById(R.id.frag_detail);
            manager.requestConnectionInfo(channel, fragment);
            //fragment.peerCountInfo=result;
            //fragment.peerCt = peerCountFromDlist;
            //fragment.peerNm = peerNameFromDlist;
        } 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));
        //peerCountFromDlist = fragment.peerTot;
        //peerNameFromDlist = fragment.deviceid;

    }

    intent.putExtra("message",result);
    intent.setClass(context, WiFiDirectActivity.class);
    context.startActivity(intent);
}

---

多亏了Mike M，我找到了从BroadcastReceiver向主要活动发送一些数据的简单方法。（同样的方法setIsWifiP2pEnabled（boolean-isWifiP2pEnabled）方法有效）

发送

“消息”

并将其检索到

str

变量

在main活动中创建公共方法：

   public void setResult(String result){
          str = result;
}

然后在广播接收器中调用它：

---

activity.setResult（“消息”）
你们试过共享参考资料吗？嘿，伙计们，谢谢你们的回答！事实上，我尝试了我熟悉的东西，因为我对android有点陌生@Itzik什么是SharedReferences？@Mike我现在可以理解检索部分了，对不起，但是你把信息放在“开始活动的意图”中是什么意思？@Mike哦，谢谢，我现在明白了！它就在那个演示代码中（setIsWifiP2pEnabled也是这样做的），我没有看到它。我觉得现在问这个问题很愚蠢lol对不起你的时间，非常感谢你指出这一点！如果你愿意的话，可以加上它作为答案，然后我会把它标记为答案：）@Mike ohh很好，你不知怎么回答了，谢谢你！我补充了答案。再次感谢。