android - Android Lollipop 的 USB 连接问题

Question

目前我正在开发一个需要两个硬件才能通过 USB 连接到设备的应用程序。我遇到了一个错误，应用程序可以看到这两个设备，但应用程序只能与插入 USB 集线器的最后一个硬件建立连接。

android OS 版本是 5.1，我使用了 UsbManager 类。

有没有办法来解决这个问题？谢谢。

它发生在 mReader.open()

这是发生错误的代码片段：

public BroadcastReceiver mReceiver = new BroadcastReceiver() {

        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if (ACTION_USB_PERMISSION.equals(action)) {
                synchronized (this) {
                    Log.d(TAG,"BroadcastReceiver  onReceive");
                    UsbDevice device = (UsbDevice) intent
                            .getParcelableExtra(UsbManager.EXTRA_DEVICE);
                    if(mReader.isSupported(device)){
                        if (intent.getBooleanExtra(
                                UsbManager.EXTRA_PERMISSION_GRANTED, false)) {
                            if (device != null) {
                                Log.d(TAG,"BroadcastReceiver  Opentask");
                                mReader.open(device);
                            }
                        }

                    }

                }
            } else if (UsbManager.ACTION_USB_DEVICE_DETACHED.equals(action)) {
                Log.d(TAG,"BroadcastReceiver  ACTION_USB_DEVICE_DETACHED");
                synchronized (this) {

                    UsbDevice device = (UsbDevice) intent
                            .getParcelableExtra(UsbManager.EXTRA_DEVICE);

                    if (device != null && device.equals(mReader.getDevice())) {
                        Log.d(TAG,"BroadcastReceiver  Closetaks");
                        mReader.close();
                    }
                }
            }
        }
    };

这是从设备收到的错误：

    java.lang.RuntimeException: Error receiving broadcast Intent { act=com.android.example.USB_PERMISSION flg=0x10 (has extras) } in ph.com.healthpods.fragments.BaseFragment$3@3b8349d7
    at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:876)
    at android.os.Handler.handleCallback(Handler.java:739)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:135)
    at android.app.ActivityThread.main(ActivityThread.java:5280)
    at java.lang.reflect.Method.invoke(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:372)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:963)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:758)
    Caused by: java.lang.IllegalArgumentException: Cannot claim interface.
    at com.acs.smartcard.Reader.open(SourceFile:1613)
    at ph.com.healthpods.fragments.BaseFragment$3.onReceive(BaseFragment.java:278)
    at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:866)

标签： androidusbandroid-hardware