如何解决打开http连接进行音频流传输
| 我正在尝试创建一个用于播放现场广播的应用程序。我正在使用以下方法打开http连接,并为此网址指定“ http://64.62.xxx.xxxx:xxx / \” 但是我得到了nullpointer异常, public InputStream OpenHttpConnection(String urlString) throws IOException
{
InputStream in = null;
int response = -1;
URL url = new URL(urlString);
URLConnection conn = url.openConnection();
if (!(conn instanceof HttpURLConnection))
throw new IOException(\"Error connecting\");
try{
HttpURLConnection httpConn = (HttpURLConnection) conn;
httpConn.setAllowUserInteraction(false);
conn.setDoInput(true);
httpConn.setInstanceFollowRedirects(true);
httpConn.setRequestMethod(\"GET\");
httpConn.connect();
response = httpConn.getResponseCode();
System.out.println(\"Response : \"+response);
if (response == HttpURLConnection.HTTP_OK)
{
in = httpConn.getInputStream();
}
}
catch (Exception ex)
{
throw new IOException(\"Error connecting\");
}
return in;
}
有没有其他方法可以从这种类型的网址流式传输数据,或者我需要在上述方法中添加其他内容?
我创建了MediaPlayer的实例。我的logcat显示以下错误:
05-25 15:50:08.067:DEBUG / MediaPlayer(1032):无法在客户端打开文件,尝试在服务器端
05-25 15:50:08.189:WARN / MediaPlayer(1032):信息/警告(1、26)
05-25 15:50:08.217:错误/ PlayerDriver(31):命令PLAYER_INIT完成并显示错误或信息PVMFFailure
05-25 15:50:08.217:错误/ MediaPlayer(1032):错误(1,-1)
05-25 15:50:08.237:WARN / PlayerDriver(31):PVMFInfoErrorHandlingComplete
05-25 15:50:08.357:DEBUG / MediaPlayer(1032):创建失败:
05-25 15:50:08.357:DEBUG / MediaPlayer(1032):java.io.IOException:准备失败。:status = 0x1
05-25 15:50:08.357:DEBUG / MediaPlayer(1032):位于android.media.MediaPlayer.prepare(本机方法)
05-25 15:50:08.357:调试/ MediaPlayer(1032):位于android.media.MediaPlayer.create(MediaPlayer.java:608)
05-25 15:50:08.357:调试/ MediaPlayer(1032):位于android.media.MediaPlayer.create(MediaPlayer.java:585)
05-25 15:50:08.357:DEBUG / MediaPlayer(1032):位于org.sample.AudioPlayer.AudioPlayer.PlayRadio(AudioPlayer.java:190)
05-25 15:50:08.357:DEBUG / MediaPlayer(1032):位于org.sample.AudioPlayer.AudioPlayer.access $ 1(AudioPlayer.java:123)
05-25 15:50:08.357:调试/ MediaPlayer(1032):在org.sample.AudioPlayer.AudioPlayer $ 3.onClick(AudioPlayer.java:77)
05-25 15:50:08.357:调试/ MediaPlayer(1032):在android.view.View.performClick(View.java:2364)
05-25 15:50:08.357:DEBUG / MediaPlayer(1032):位于android.view.View.onTouchEvent(View.java:4179)
05-25 15:50:08.357:调试/ MediaPlayer(1032):位于android.widget.TextView.onTouchEvent(TextView.java:6541)
05-25 15:50:08.357:DEBUG / MediaPlayer(1032):位于android.view.View.dispatchTouchEvent(View.java:3709)
05-25 15:50:08.357:DEBUG / MediaPlayer(1032):位于android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
05-25 15:50:08.357:DEBUG / MediaPlayer(1032):位于android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
05-25 15:50:08.357:DEBUG / MediaPlayer(1032):位于android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
05-25 15:50:08.357:DEBUG / MediaPlayer(1032):位于android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
05-25 15:50:08.357:调试/ MediaPlayer(1032):在com.android.internal.policy.impl.PhoneWindow $ DecorView.superDispatchTouchEvent(PhoneWindow.java:1659)
05-25 15:50:08.357:调试/ MediaPlayer(1032):在com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1107)
05-25 15:50:08.357:调试/ MediaPlayer(1032):位于android.app.Activity.dispatchTouchEvent(Activity.java:2061)
05-25 15:50:08.357:调试/ MediaPlayer(1032):在com.android.internal.policy.impl.PhoneWindow $ DecorView.dispatchTouchEvent(PhoneWindow.java:1643)
05-25 15:50:08.357:调试/ MediaPlayer(1032):在android.view.ViewRoot.handleMessage(ViewRoot.java:1691)
05-25 15:50:08.357:DEBUG / MediaPlayer(1032):在android.os.Handler.dispatchMessage(Handler.java:99)
05-25 15:50:08.357:调试/ MediaPlayer(1032):位于android.os.Looper.loop(Looper.java:123)
05-25 15:50:08.357:调试/ MediaPlayer(1032):位于android.app.ActivityThread.main(ActivityThread.java:4363)
05-25 15:50:08.357:DEBUG / MediaPlayer(1032):at java.lang.reflect.Method.invokeNative(本机方法)
05-25 15:50:08.357:DEBUG / MediaPlayer(1032):at java.lang.reflect.Method.invoke(Method.java:521)
05-25 15:50:08.357:调试/ MediaPlayer(1032):在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:860)
05-25 15:50:08.357:DEBUG / MediaPlayer(1032):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
05-25 15:50:08.357:DEBUG / MediaPlayer(1032):在dalvik.system.NativeStart.main(本机方法)
05-25 15:51:05.277:DEBUG / dalvikvm(97):GC在127ms内释放了14个对象/ 560个字节
05-25 15:51:13.280:DEBUG / AndroidRuntime(1032):关闭VM
05-25 15:51:13.280:WARN / dalvikvm(1032):threadid = 3:线程以未捕获的异常退出(group = 0x4001b188)
05-25 15:51:13.280:错误/ AndroidRuntime(1032):未捕获的处理程序:由于未捕获的异常而导致线程主退出
谢谢!!
解决方法
首先检查来自服务器的连接,您可以使用HTTP调试器
因为你想播放音频
创建一个媒体播放器实例并在SetDataSource中设置filedescriptor
m_player.setOnPreparedListener(this);
m_player.setAudioStreamType(AudioManager.STREAM_MUSIC);
m_player.setDataSource(filedescriptor fd);
m_player.prepareAsync();
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