如何使用 NanoHTTPD 将图像发送到 Chromecast

Question

我想向 Chromecast 提供文件（例如图像）。我使用了 nanoHTTPD，所以我可以通过 url 访问内容，这是我用来获取 url:

的代码

private class WebServer extends NanoHTTPD {

    public WebServer() {
        super(8080);
    }


    @Override
    public Response serve(String uri, Method method,
                          Map<String, String> header, Map<String, String> parameters,
                          Map<String, String> files) {
        File rootDir = Environment.getExternalStorageDirectory();
        File[] filesList = null;
        String filepath = "";
        if (uri.trim().isEmpty()) {
            filesList = rootDir.listFiles();
        } else {
            filepath = uri.trim();
        }
        filesList = new File(filepath).listFiles();
        String answer = "<html><head><meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\"><title>sdcard0 - TECNO P5 - WiFi File Transfer Pro</title>";
        if (new File(filepath).isDirectory()) {
            for (File detailsOfFiles : filesList) {
                answer += "<a href=\"" + detailsOfFiles.getAbsolutePath()
                        + "\" alt = \"\">"
                        + detailsOfFiles.getAbsolutePath() + "</a><br>";
            }
        } else {
        }
        answer += "</head></html>" + "uri: " + uri + " \nfiles " + files
                + " \nparameters " + parameters + " \nheader ";
        return new NanoHTTPD.Response(answer);
    }

    }

这样我可以得到像“192.168.X.XX:8080/image.gif”这样的url。然后我为此创建一个常规 MediaInfo url:

private void startVideo() {
    MediaMetadata mediaMetadata = new MediaMetadata(     MediaMetadata.MEDIA_TYPE_PHOTO );
    mediaMetadata.putString( MediaMetadata.KEY_TITLE, getString( R.string.titulo_video ) );

    MediaInfo mediaInfo = new MediaInfo.Builder( getString( R.string.video_url ) )
            .setContentType( getString( R.string.content_type_gif ) )
            .setStreamType( MediaInfo.STREAM_TYPE_BUFFERED )
            .setMetadata( mediaMetadata )
            .build();
    try {
        mRemoteMediaPlayer.load( apiClient, mediaInfo, true )
                .setResultCallback( new ResultCallback<RemoteMediaPlayer.MediaChannelResult>() {
                    @Override
                    public void onResult( RemoteMediaPlayer.MediaChannelResult mediaChannelResult ) {
                        if( mediaChannelResult.getStatus().isSuccess() ) {
                            mVideoIsLoaded = true;
                            mButton.setText( getString( R.string.pause_video ) );
                        }
                    }
                } );
    } catch( Exception e ) {
    }
}

其中 <string name="video_url">http://192.168.1.38:8080/sdcard/logo_etsiit.gif</string> 是我之前得到的 url，但是当我尝试投射图像时没有任何反应。

是否可以直接将文件提供给 MediaInfo 而无需从网络浏览器复制和粘贴 url？

如果需要更多代码，请告诉我。

记录错误：

08-07 20:30:35.568  14669-14669/com.example.httpserver W/Httpd﹕ Web server initialized.
08-07 20:30:35.601  14669-14669/com.example.httpserver I/MediaRouter﹕ Found default route: MediaRouter.RouteInfo{ uniqueId=android/.support.v7.media.SystemMediaRouteProvider:DEFAULT_ROUTE, name=Teléfono, description=null, enabled=true, connecting=false, playbackType=0, playbackStream=3, volumeHandling=1, volume=3, volumeMax=15, presentationDisplayId=-1, extras=null, providerPackageName=android }
08-07 20:30:35.610  14669-14669/com.example.httpserver W/System.err﹕ java.net.BindException: bind failed: EADDRINUSE (Address already in use)
08-07 20:30:35.611  14669-14669/com.example.httpserver W/System.err﹕ at libcore.io.IoBridge.bind(IoBridge.java:99)
08-07 20:30:35.611  14669-14669/com.example.httpserver W/System.err﹕ at java.net.PlainSocketImpl.bind(PlainSocketImpl.java:132)
08-07 20:30:35.611  14669-14669/com.example.httpserver W/System.err﹕ at java.net.ServerSocket.bind(ServerSocket.java:335)
08-07 20:30:35.611  14669-14669/com.example.httpserver W/System.err﹕ at java.net.ServerSocket.bind(ServerSocket.java:295)
08-07 20:30:35.611  14669-14669/com.example.httpserver W/System.err﹕ at com.example.httpserver.NanoHTTPD.start(NanoHTTPD.java:142)
08-07 20:30:35.611  14669-14669/com.example.httpserver W/System.err﹕ at com.example.httpserver.MainActivity.onResume(MainActivity.java:128)
08-07 20:30:35.611  14669-14669/com.example.httpserver W/System.err﹕ at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1257)
08-07 20:30:35.611  14669-14669/com.example.httpserver W/System.err﹕ at android.app.Activity.performResume(Activity.java:6076)
08-07 20:30:35.611  14669-14669/com.example.httpserver W/System.err﹕ at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2975)
08-07 20:30:35.611  14669-14669/com.example.httpserver W/System.err﹕ at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3017)
08-07 20:30:35.611  14669-14669/com.example.httpserver W/System.err﹕ at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2392)
08-07 20:30:35.611  14669-14669/com.example.httpserver W/System.err﹕ at android.app.ActivityThread.access0(ActivityThread.java:151)
08-07 20:30:35.611  14669-14669/com.example.httpserver W/System.err﹕ at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
08-07 20:30:35.611  14669-14669/com.example.httpserver W/System.err﹕ at android.os.Handler.dispatchMessage(Handler.java:102)
08-07 20:30:35.611  14669-14669/com.example.httpserver W/System.err﹕ at android.os.Looper.loop(Looper.java:135)
08-07 20:30:35.611  14669-14669/com.example.httpserver W/System.err﹕ at android.app.ActivityThread.main(ActivityThread.java:5254)
08-07 20:30:35.611  14669-14669/com.example.httpserver W/System.err﹕ at java.lang.reflect.Method.invoke(Native Method)
08-07 20:30:35.612  14669-14669/com.example.httpserver W/System.err﹕ at java.lang.reflect.Method.invoke(Method.java:372)
08-07 20:30:35.612  14669-14669/com.example.httpserver W/System.err﹕ at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
08-07 20:30:35.612  14669-14669/com.example.httpserver W/System.err﹕ at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
08-07 20:30:35.612  14669-14669/com.example.httpserver W/System.err﹕ Caused by: android.system.ErrnoException: bind failed: EADDRINUSE (Address already in use)
08-07 20:30:35.612  14669-14669/com.example.httpserver W/System.err﹕ at libcore.io.Posix.bind(Native Method)
08-07 20:30:35.612  14669-14669/com.example.httpserver W/System.err﹕ at libcore.io.ForwardingOs.bind(ForwardingOs.java:56)
08-07 20:30:35.612  14669-14669/com.example.httpserver W/System.err﹕ at libcore.io.IoBridge.bind(IoBridge.java:97)
08-07 20:30:35.612  14669-14669/com.example.httpserver W/System.err﹕ ... 19 more

当我 select 来自网络浏览器的图像时，我只能看到：

uri: /sdcard/logo_etsiit.gif files {} parameters {} header

编辑：我用 WebServer class 解决了这个问题，现在我可以在我的网络浏览器中看到图像或 PDF selected

  public class webserver extends NanoHTTPD {
    FileInputStream fileInputStream;

    public webserver(){
        super(8080);
    }
    @Override
    public Response serve(String uri, Method method, Map<String, String> header,Map<String, String> parameters, Map<String, String> files) {
        String mediasend=getExtension(chosenFile);

        FileInputStream fis = null;
        try {
            fis = new FileInputStream(Environment.getExternalStorageDirectory()
                    + "/" + chosenFile);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }



        return new NanoHTTPD.Response(etsiit.etsiitcast_def.NanoHTTPD.Response.Status.OK,mediasend,fis);
    }
}

我也将这段代码添加到 onCreate:

  //Get the ip of the device running NanoHTTPD server
    WifiManager wifiManager = (WifiManager) getSystemService(WIFI_SERVICE);
    WifiInfo wifiInfo = wifiManager.getConnectionInfo();
    int ipAddress = wifiInfo.getIpAddress();
    ipdevice=String.format("http://%d.%d.%d.%d:8080",(ipAddress & 0xff),(ipAddress >> 8 & 0xff),(ipAddress >> 16 & 0xff),(ipAddress >> 24 & 0xff));

    // start the webserver
    mediaserver = new webserver();
    try {
        mediaserver.start();
    } catch(IOException ioe) {
        Log.d("Httpd", "The server could not start.");
    }

Answer 1

我找到了问题的解决方案：我只需要将 MediaInfo mediaInfo = new MediaInfo.Builder( getString( R.string.video_url ) ) 更改为 MediaInfo mediaInfo = new MediaInfo.Builder(ipdevice)，其中 ipdevice 是我的 phone IP 地址（例如 http://192.168.1.40:8080).

如何使用 NanoHTTPD 将图像发送到 Chromecast

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