android-USB Host

最新推荐文章于 2022-04-19 15:55:17 发布

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本文介绍了如何在Android 3.1及以上版本中利用USB主机模式进行设备通信。包括在AndroidManifest.xml中声明USB主机特性及最低API级别，定义Intent过滤器以监听USB设备连接事件，并通过资源文件指定感兴趣的USB设备。还提供了获取USB设备列表、打开设备连接及进行数据传输的方法。

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USB host mode is supported in Android 3.1 and higher. Once you obtain the correct endpoint, open aUsbDeviceConnection to communicate with the USB device.

The following example shows a sample manifest and its corresponding resource file:

<manifest ...>
    <uses-feature android:name="android.hardware.usb.host" />
    <uses-sdk android:minSdkVersion="12" />
    ...
    <application>
        <activity ...>
            ...
            <intent-filter>
                <action android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" />
            </intent-filter>

            <meta-data android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED"
                android:resource="@xml/device_filter" />
        </activity>
    </application>
</manifest>

The following example shows how to declare the corresponding resource file that specifies the USB devices that you're interested in:

<?xml version="1.0" encoding="utf-8"?>

<resources>
    <usb-device vendor-id="1234" product-id="5678" />
</resources>

》 The hash map is keyed by the USB device's name if you want to obtain a device from the map.

UsbManager manager = (UsbManager) getSystemService(Context.USB_SERVICE);
...  
HashMap<String, UsbDevice> deviceList = manager.getDeviceList();
UsbDevice device = deviceList.get("deviceName");

If desired, you can also just obtain an iterator from the hash map and process each device one by one:

UsbManager manager = (UsbManager) getSystemService(Context.USB_SERVICE);
...
HashMap<String, UsbDevice> deviceList = manager.getDeviceList();
Iterator<UsbDevice> deviceIterator = deviceList.values().iterator();
while(deviceIterator.hasNext()){
    UsbDevice device = deviceIterator.next();
    //your code
}

UsbInterface intf = device.getInterface(0);
UsbEndpoint endpoint = intf.getEndpoint(0);
UsbDeviceConnection connection = mUsbManager.openDevice(device); 
connection.claimInterface(intf, forceClaim);
connection.bulkTransfer(endpoint, bytes, bytes.length, TIMEOUT); //do in another thread