使用android应用程序检查miracast兼容设备

Question

我如何在安卓系统中搜索与Miracast兼容的设备(可能正在使用WiFi Direct)？

我只是想知道Android4.2中的DisplayManager和演示类对演示文稿有帮助& miracast。但是有什么方法可以检查另一个设备是否与Miracast兼容/搜索Miracast接收器？

谢谢

史密莎

Answer 1

android框架源代码展示了如何搜索miracast接收器设备。

基本使用WiFi直接设备搜索API，discoverPeers -> requestPeers -> isWifiDisplay和isPrimarySinkDeviceType

private static boolean isWifiDisplay(WifiP2pDevice device) {
    return device.wfdInfo != null
           && device.wfdInfo.isWfdEnabled()
           && isPrimarySinkDeviceType(device.wfdInfo.getDeviceType());
}

private static boolean isPrimarySinkDeviceType(int deviceType) {
    return deviceType == WifiP2pWfdInfo.PRIMARY_SINK
           || deviceType == WifiP2pWfdInfo.SOURCE_OR_PRIMARY_SINK;
}

scan

WifiP2pWfdInfo定义了四种设备类型，

public static final int WFD_SOURCE              = 0;
public static final int PRIMARY_SINK            = 1;
public static final int SECONDARY_SINK          = 2;
public static final int SOURCE_OR_PRIMARY_SINK  = 3;

http s://android.googlesource.com/platform/frameworks/base/+/master/wifi/java/android/net/wifi/p2p/WifiP2pWfdInfo.java

如果你不熟悉wifi直接，也许我的应用程序是有用的使用wifi直接api。

http ://github.com/kensuke/WiFiDirectTestApp

添加: 2014/02/24 -解析用于识别Miracast设备源或Sink的toString输出字符串

wfd直接API () requestPeers()回调到onPeersAvailable()，该方法的参数WifiP2pDeviceList在P2p设备附近有一个WifiP2pDevice实例列表，WifiP2pDevice有一个设备wfd直接信息，包括Miracast信息(wfd.)而设备进入可以使用WifiP2pDevice.toString()方法。

搜索"WFD DeviceInfo: XXX“字符串，XXX是一个数值，蒙面"0x03”(见WifiP2pWfdInfo.java)，蒙面后得到0-3。该值定义了源或接收器，请参见WifiP2pWfdInfo.java常量)。

private static final int WFD_SOURCE = 0;
private static final int PRIMARY_SINK = 1;
private static final int SECONDARY_SINK = 2;
private static final int SOURCE_OR_PRIMARY_SINK = 3;

这种职责方式可以在非根设备上使用，一般应用程序。

WifiP2pDevice.toString()返回值的示例

“装置: ZTS1145

地址: 7a:e8:b6:f6:4d:74

主要型号: 10-0050F204-5

次要类型: null

主要用途wps: 392

主要雇员人数:0

电话会议: 33

(二)基本状况:3

已启用WFD : trueWFD DeviceInfo: 273

主要产品WFD CtrlPort: 7236

主要产品MaxThroughput: 10“

// callback method of requestPeers();
public void onPeersAvailable(WifiP2pDeviceList peers) {
    List<WifiP2pDevice> devs = new ArrayList<WifiP2pDevice>(peers.getDeviceList());
    for (int i = 0; i < devs.size(); i++) {
        WifiP2pDevice dev = devs.get(i);
        boolean src = isWifiDisplaySource(dev);
        boolean sink = isWifiDisplaySink(dev);
        Log.d(TAG, dev.deviceName + " isSource[" + src + "] isSink[" + sink + "]");
    }
}

private static final int WFD_DISABLED = -1;
private static final int WFD_SOURCE = 0;
private static final int PRIMARY_SINK = 1;
private static final int SECONDARY_SINK = 2;
private static final int SOURCE_OR_PRIMARY_SINK = 3;

private static final int DEVICE_TYPE = 0x3;

private int getWFDDeviceInfoFromString(String devStr) {
    if (devStr == null) {
        return WFD_DISABLED;
    }

    boolean wfd = false;
    for (String line : devStr.split("\n")) {
        // start self parsing...
        // TODO: sprintf parse is more easy

        // search "WFD enabled: [true|false]"
        if (!line.matches(".*WFD enabled:.*")) {
            continue;
        }

        String[] tokens = line.split(":");
        int toks = tokens.length;
        for (int i = 0; i < toks - 1; i++) {
            if (!tokens[i].contains("WFD enabled")) {
                continue;
            }

            String tok = tokens[i + 1].replaceAll("\\s", ""); // delete white space
            if (tok.startsWith("true")) {
                wfd = true;
                break;
            }
            // why didn't use .equals() instead of .contains() and .startsWith() ? because
            // 1) "wfdInfo: WFD enabled: trueWFD DeviceInfo: 273"          // inputed string
            // 2) "(wfdInfo):( WFD enabled):( trueWFD DeviceInfo):( 273)"  // : splited string
            // 3) "( trueWFD DeviceInfo)" => "trueWFD DeviceInfo"          // white space deleted
        }
    }
    if (!wfd) {
        return WFD_DISABLED;
    }

    for (String line : devStr.split("\n")) {
        // search "WFD DeviceInfo: \d+"
        if (!line.matches(".*WFD DeviceInfo:.*")) {
            continue;
        }

        String[] tokens = line.split(":");
        int toks = tokens.length;
        for (int i = 0; i < toks - 1; i++) {
            if (!tokens[i].contains("WFD DeviceInfo")) {
                continue;
            }

            String tok = tokens[i + 1].replaceAll("\\s", "");
            int deviceInfo = Integer.parseInt(tok);
            Log.d(TAG, "line[" + line + "] DeviceInfo[" + deviceInfo + "] masked[" + (deviceInfo & DEVICE_TYPE) + "]");
            return deviceInfo;
        }
    }

    return WFD_DISABLED;
}

private boolean isWifiDisplaySource(WifiP2pDevice dev) {
    if (dev == null) {
        return false;
    }

    int deviceInfo = getWFDDeviceInfoFromString(dev.toString());
    if (deviceInfo == WFD_DISABLED) {
        return false;
    }

    int deviceType = deviceInfo & DEVICE_TYPE; // masked
    return deviceType == WFD_SOURCE || deviceType == SOURCE_OR_PRIMARY_SINK;
}

private boolean isWifiDisplaySink(WifiP2pDevice dev) {
    if (dev == null) {
        return false;
    }

    int deviceInfo = getWFDDeviceInfoFromString(dev.toString());
    if (deviceInfo == WFD_DISABLED) {
        return false;
    }

    int deviceType = deviceInfo & DEVICE_TYPE; // masked
    return deviceType == PRIMARY_SINK || deviceType == SOURCE_OR_PRIMARY_SINK;
}