Android USB Host开发之manager.getDeviceList()获取不到设备列表

Android USB Host开发之manager.getDeviceList()获取不到设备列表

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Java
Android 2013-05-15 11:46
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Androidusb

同样遇到这样的问题，我的Android设备是原道N12C，官方的4.0.3系统，遇到这个问题，后来找了半天找到的，现在汇总一下吧：

1、创建 android.hardware.usb.host.xml，内容为：

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<permissions> <feature name="android.hardware.usb.host"/> </permissions>

<permissions>
<feature name="android.hardware.usb.host"/>
</permissions>

将该文件push到/system/etc/permissions目录下

2、在/system/etc/permissions下的handheld_core_hardware.xml或者tablet_core_hardware.xml文件的<permissions>段中添加：

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<feature name="android.hardware.usb.host" />

<feature name="android.hardware.usb.host" />

重启设备

3、修改AndroidManifest.xml文件，添加以下权限：

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<uses-permission android:name="android.hardware.usb.host" />

<uses-permission android:name="android.hardware.usb.host" />

4、枚举设备的代码例子：

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UsbManager manager = (UsbManager) getSystemService(Context.USB_SERVICE);
HashMap<String, UsbDevice> deviceList = manager.getDeviceList();
Log.e(TAG, "get device list = " + deviceList.size());
Toast.makeText(this, "get device list = " + deviceList.size(), 200).show();
Iterator<UsbDevice> deviceIterator = deviceList.values().iterator();
while (deviceIterator.hasNext()) {
UsbDevice device = deviceIterator.next();
Log.e(TAG, "device name = " + device.getDeviceName());
}

UsbManager manager = (UsbManager) getSystemService(Context.USB_SERVICE);
HashMap<String, UsbDevice> deviceList = manager.getDeviceList();
Log.e(TAG, "get device list  = " + deviceList.size());
Toast.makeText(this, "get device list  = " + deviceList.size(), 200).show();
Iterator<UsbDevice> deviceIterator = deviceList.values().iterator();
while (deviceIterator.hasNext()) {
UsbDevice device = deviceIterator.next();
Log.e(TAG, "device name = " + device.getDeviceName());
}

6、相关连接：

http://stackoverflow.com/questions/11183792/android-usb-host-and-hidden-devices

http://bbs.csdn.net/topics/390008074

http://developer.android.com/guide/topics/connectivity/usb/host.html