【发布时间】：2020-03-18 14:36:53
【问题描述】：
使用此代码：
public class MainActivity extends AppCompatActivity {
int clientAmount = 0;
int localPort = 0;
// Used to load the 'native-lib' library on application startup.
static {
System.loadLibrary("native-lib");
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
try {
AudioManager audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audio.setMode(AudioManager.MODE_IN_COMMUNICATION);
final AudioGroup m_AudioGroup = new AudioGroup();
m_AudioGroup.setMode(AudioGroup.MODE_NORMAL);
final AudioStream m_AudioStream = new AudioStream(getAPAddress());
int localPort = m_AudioStream.getLocalPort();
Log.d("VOIP","Local Port: "+ Integer.toString(localPort));
m_AudioStream.setCodec(AudioCodec.PCMU);
m_AudioStream.setMode(RtpStream.MODE_NORMAL);
findViewById(R.id.connectButton).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String remoteAddress = "";
String remotePort = "";
try {
remoteAddress = ((TextView) findViewById(R.id.ipField)).getText().toString();
//String remoteAddress = fetchIPs().get(0);
remotePort = ((EditText) findViewById(R.id.portField)).getText().toString();
}catch(Exception e){
((TextView) findViewById(R.id.statusLabel)).setText("Enter Correct Information");
}
//Log.d("VOIP", fetchIPs().get(0));
try {
m_AudioStream.associate(InetAddress.getByName(remoteAddress), Integer.parseInt(remotePort));
Log.d("VOIP","Succesfully connected to " + remoteAddress);
} catch (Exception e) {
((TextView) findViewById(R.id.statusLabel)).setText("Exception with associating");
Log.d("VOIP","Exception with associating");
Log.d("VOIP", e.getMessage());
}
m_AudioStream.join(m_AudioGroup);
}
});
findViewById(R.id.DisconnectButton).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
m_AudioStream.release();
}
});
} catch (Exception e) {
Log.e("VOIP", "Exception when setting up the Audiostream!");
e.printStackTrace();
}
}
public InetAddress getAPAddress() {
try {
for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) {
NetworkInterface intf = en.nextElement();
if(intf.getName().equals("ap0")) {
for (Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements(); ) {
InetAddress inetAddress = enumIpAddr.nextElement();
for(int i = 0; i<intf.getInterfaceAddresses().size(); i++){
if( intf.getInterfaceAddresses().get(i).getAddress() instanceof Inet4Address){
Log.d("VOIP", "IP: " + intf.getInterfaceAddresses().get(i).getAddress() + " NetworkInterface: " + intf.getName());
return (Inet4Address) intf.getInterfaceAddresses().get(i).getAddress();
}
}
}
}
}
} catch (SocketException ex) {
Log.e("VOIP", ex.toString());
}
return null;
}
public InetAddress getWLANAddress() {
InetAddress result = null;
try {
for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) {
NetworkInterface intf = en.nextElement();
if(intf.getName().equals("wlan0")) {
for (Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements(); ) {
InetAddress inetAddress = enumIpAddr.nextElement();
InterfaceAddress a = intf.getInterfaceAddresses().get(1);
for(int i = 0; i<intf.getInterfaceAddresses().size(); i++){
if( intf.getInterfaceAddresses().get(i).getAddress() instanceof Inet4Address){
Log.d("VOIP", "IP: " + intf.getInterfaceAddresses().get(i).getAddress() + " NetworkInterface: " + intf.getName());
result = intf.getInterfaceAddresses().get(i).getAddress();
}
}
if (!inetAddress.isLoopbackAddress()) {
return result;
}
}
}
}
} catch (SocketException ex) {
Log.e("VOIP", ex.toString());
}
Log.d("VOIP"," Access Point nor Wlan accessible");
return null;
}
}
activity_main.xml：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/LinearLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<TextView
android:id="@+id/lblLocalPort"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/localPort" />
<EditText
android:id="@+id/ipField"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:ems="10"
android:hint="@string/iPHint"
android:inputType="phone" />
<EditText
android:id="@+id/portField"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:ems="10"
android:hint="@string/portHint"
android:inputType="number">
<requestFocus />
</EditText>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dp">
<Button
android:id="@+id/connectButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/connect" />
<Button
android:id="@+id/DisconnectButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/Disconnect" />
<Button
android:id="@+id/fetchButtons"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Fetch IPs" />
</LinearLayout>
<TextView
android:id="@+id/statusLabel"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="TextView" />
</LinearLayout>
我想创建一个点对点 Walkie Talkie 应用程序，允许我在两个设备之间传输音频。一个称为 HostDevice 的设备创建一个 WiFi 接入点（热点），另一个设备 ClientDevice 连接到它。我的理解是，使用 HostDevice，我使用接入点网络接口的 InetAddress（称为“ap0”）启动 AudioStream，使用 ClientDevice，我使用 wlan 网络接口的 InetAddress（“wlan0”）启动 AudioStream。 （这是正确的吗？）所以当我将代码上传到 HostDevice 时，我写道：
final AudioStream m_AudioStream = new AudioStream(getAPAddress());
在 ClientDevice 端我有相同的代码，除了我像这样启动 AudioStream：
final AudioStream m_AudioStream = new AudioStream(getWLANAddress());
如下图所示，当我输入两台设备的 IP 地址和端口号，然后在任一设备上按连接时，我在 m_AudioStream.associate(InetAddress.getByName(remoteAddress), Integer.parseInt(remotePort)); 处收到异常消息，显然，我没有听到任何来自来自任一设备的扬声器。
This answer from Murphybro2 表示这就是两个设备相互通信所需的全部内容。那么我的理解在哪里崩溃了？
【问题讨论】：
标签： android audio-streaming hotspot rpt