安卓应用future.usb.usbmanager

Question

我在一台新买的安卓平板电脑上运行我的应用程序时遇到了一些问题。在我之前的安卓手机上也能用。这是我的logcat输出--

03-23 16:13:12.250: E/AndroidRuntime(12284): FATAL EXCEPTION: main
03-23 16:13:12.250: E/AndroidRuntime(12284): java.lang.NoClassDefFoundError: com.android.future.usb.UsbManager
03-23 16:13:12.250: E/AndroidRuntime(12284):    at edu.uidaho.pong.PongActivity.setupAccessory(PongActivity.java:111)
03-23 16:13:12.250: E/AndroidRuntime(12284):    at edu.uidaho.pong.PongActivity.onCreate(PongActivity.java:44)
03-23 16:13:12.250: E/AndroidRuntime(12284):    at android.app.Activity.performCreate(Activity.java:4465)
03-23 16:13:12.250: E/AndroidRuntime(12284):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
03-23 16:13:12.250: E/AndroidRuntime(12284):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
03-23 16:13:12.250: E/AndroidRuntime(12284):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
03-23 16:13:12.250: E/AndroidRuntime(12284):    at android.app.ActivityThread.access$600(ActivityThread.java:123)
03-23 16:13:12.250: E/AndroidRuntime(12284):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
03-23 16:13:12.250: E/AndroidRuntime(12284):    at android.os.Handler.dispatchMessage(Handler.java:99)
03-23 16:13:12.250: E/AndroidRuntime(12284):    at android.os.Looper.loop(Looper.java:137)
03-23 16:13:12.250: E/AndroidRuntime(12284):    at android.app.ActivityThread.main(ActivityThread.java:4424)
03-23 16:13:12.250: E/AndroidRuntime(12284):    at java.lang.reflect.Method.invokeNative(Native Method)
03-23 16:13:12.250: E/AndroidRuntime(12284):    at java.lang.reflect.Method.invoke(Method.java:511)
03-23 16:13:12.250: E/AndroidRuntime(12284):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
03-23 16:13:12.250: E/AndroidRuntime(12284):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
03-23 16:13:12.250: E/AndroidRuntime(12284):    at dalvik.system.NativeStart.main(Native Method)

Answer 1

来自http://developer.android.com/guide/topics/usb/accessory.html

解决方案是使用android.hardware.usb而不是com.android.future.usb

为了与android.hardware.usb版本匹配，还必须更改一些代码行。你需要的一切都在包含的链接中。