我想使用 CyberGarage“CyberLink for Java”API 为 Android 编写一个 UPnP 控制点应用程序。为了测试 API，我实现了一个非常简单的应用程序。在此应用程序中，UPnP 控制点主动搜索任何 UPnP 根设备，侦听响应和设备通知，并打印网络上可用的设备列表。
该应用程序在 Android 手机上运行，但在我的网络上找不到任何 UPnP 设备。我在两部不同的安卓手机上试过这个。为了检查这是否是特定于 Android 的问题，我实现了与 Java 控制台应用程序相同的功能。有趣的是，Java 控制台应用程序工作得非常好，并且总是显示我网络上的所有 UPnP 设备！
那么为什么这在 Android 上不起作用呢？请注意，在 Android 应用程序中，我必须使用 AsyncTask 在单独的线程上实现网络特定功能。否则我会得到错误，因为我不应该在 UI 线程上运行它。但这不应该是问题，对吗？
下面是两个应用程序的源代码。
安卓应用：
MainActivity.java
package com.example.controller_v1;
import org.cybergarage.upnp.DeviceList;
import org.cybergarage.upnp.UPnP;
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Process;
import android.util.Log;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
UPnP.setEnable(UPnP.USE_ONLY_IPV4_ADDR);
new StartControlPointTask().execute();
}
private class StartControlPointTask extends AsyncTask {
public static final String TAG = "StartControlPointTask";
@Override
protected Object doInBackground(Object... params) {
Process.setThreadPriority(Process.THREAD_PRIORITY_FOREGROUND);
MyControlPoint controlPoint = new MyControlPoint();
controlPoint.start();
// controlPoint.search();
try {
Thread.sleep(5000);
} catch (InterruptedException e) {
e.printStackTrace();
}
DeviceList rootDevices = controlPoint.getDeviceList();
int numDevices = rootDevices.size();
if (numDevices > 0) {
for (int i = 0; i < numDevices; i++) {
Log.i(TAG, "device " + i + ": " + rootDevices.getDevice(i).getFriendlyName());
}
} else {
Log.i(TAG, "no root devices found");//
}
return null;
}
}
}
我的控制点.java
package com.example.controller_v1;
import org.cybergarage.upnp.ControlPoint;
import org.cybergarage.upnp.device.NotifyListener;
import org.cybergarage.upnp.device.SearchResponseListener;
import org.cybergarage.upnp.ssdp.SSDPPacket;
import android.util.Log;
public class MyControlPoint extends ControlPoint implements NotifyListener, SearchResponseListener {
public MyControlPoint() {
addNotifyListener(this);
addSearchResponseListener(this);
}
@Override
public void deviceNotifyReceived(SSDPPacket ssdpPacket) { // NotifyListener
final String TAG = "deviceNotifyReceived";
Log.i(TAG, "executed");
}
@Override
public void deviceSearchResponseReceived(SSDPPacket ssdpPacket) { // SearchResponseListener
final String TAG = "deviceSearchResponseReceived";
Log.i(TAG, "executed");
}
}
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.controller_v1"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.INTERNET"/>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.controller_v1.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
Java 控制台应用程序：
主.java
import org.cybergarage.upnp.DeviceList;
import org.cybergarage.upnp.UPnP;
public class Main {
public Main() {
UPnP.setEnable(UPnP.USE_ONLY_IPV4_ADDR);
MyControlPoint controlPoint = new MyControlPoint();
controlPoint.start();
// controlPoint.search();
try {
Thread.sleep(5000); // wait for devices to be found
} catch (InterruptedException e) {
e.printStackTrace();
}
DeviceList rootDevices = controlPoint.getDeviceList();
int numDevices = rootDevices.size();
if (numDevices > 0) {
for (int i = 0; i < numDevices; i++) {
System.out.println("found device " + i + ": " + rootDevices.getDevice(i).getFriendlyName());
}
} else {
System.out.println("no root devices found");
}
}
public static void main(String[] args) {
new Main();
}
}
我的控制点.java
import org.cybergarage.upnp.ControlPoint;
import org.cybergarage.upnp.device.NotifyListener;
import org.cybergarage.upnp.device.SearchResponseListener;
import org.cybergarage.upnp.ssdp.SSDPPacket;
public class MyControlPoint extends ControlPoint implements /*DeviceChangeListener,*/ NotifyListener, SearchResponseListener {
public MyControlPoint() {
addNotifyListener(this);
addSearchResponseListener(this);
}
@Override
public void deviceNotifyReceived(SSDPPacket packet) { // NotifyListener
System.out.println("deviceNotifyReceived");
}
@Override
public void deviceSearchResponseReceived(SSDPPacket packet) { // SearchResponseListener
System.out.println("deviceSearchReceived");
}
}
我不知道为什么 java 控制台应用程序可以工作而 android 应用程序不能。我没有从文档中得到任何答案。有谁能够帮我？