下载官方的apk demo， 插入ch340g的板子 系统会提示运行，这个时候后续 操作是正常的，包括打开、关闭和读写。 不正常的是：如果安卓重启，再次运行demo的时候，注意板子没有插入动作，这时候app就会报错，请问有什么办法可以解决这种情况呢？ 谢谢。
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CH397: 高集成度、低功耗USB网卡芯片
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ch340g 芯片 在安卓上的使用问题 咨询
chenliquan
发表于: 2016-06-13 16:19:18
问题同上：官方demo，USB一直插在安卓上，打开APP，报错。查看日志为：
08-24 07:47:54.336: I/art(4208): Not late-enabling -Xcheck:jni (already on)
08-24 07:47:54.677: D/CH34xAndroidDriver(4208): String.format not match
08-24 07:47:54.677: D/CH34xAndroidDriver(4208): String.format not match
08-24 07:47:54.678: D/CH34xAndroidDriver(4208): String.format not match
08-24 07:47:54.678: D/CH34xAndroidDriver(4208): String.format not match
08-24 07:47:54.678: D/CH34xAndroidDriver(4208): String.format not match
08-24 07:47:54.678: D/CH34xAndroidDriver(4208): String.format not match
08-24 07:47:54.678: D/CH34xAndroidDriver(4208): String.format not match
08-24 07:47:54.681: D/AndroidRuntime(4208): Shutting down VM
08-24 07:47:54.688: E/AndroidRuntime(4208): FATAL EXCEPTION: main
08-24 07:47:54.688: E/AndroidRuntime(4208): Process: com.example.c6zdh, PID: 4208
08-24 07:47:54.688: E/AndroidRuntime(4208): java.lang.RuntimeException: Unable to create application com.example.c6zdh.MyAppLication: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.hardware.usb.UsbDeviceConnection.controlTransfer(int, int, int, int, byte[], int, int)' on a null object reference
08-24 07:47:54.688: E/AndroidRuntime(4208): at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4521)
08-24 07:47:54.688: E/AndroidRuntime(4208): at android.app.ActivityThread.access$1500(ActivityThread.java:144)
08-24 07:47:54.688: E/AndroidRuntime(4208): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1339)
08-24 07:47:54.688: E/AndroidRuntime(4208): at android.os.Handler.dispatchMessage(Handler.java:102)
08-24 07:47:54.688: E/AndroidRuntime(4208): at android.os.Looper.loop(Looper.java:135)
08-24 07:47:54.688: E/AndroidRuntime(4208): at android.app.ActivityThread.main(ActivityThread.java:5221)
08-24 07:47:54.688: E/AndroidRuntime(4208): at java.lang.reflect.Method.invoke(Native Method)
08-24 07:47:54.688: E/AndroidRuntime(4208): at java.lang.reflect.Method.invoke(Method.java:372)
08-24 07:47:54.688: E/AndroidRuntime(4208): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
08-24 07:47:54.688: E/AndroidRuntime(4208): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
08-24 07:47:54.688: E/AndroidRuntime(4208): Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.hardware.usb.UsbDeviceConnection.controlTransfer(int, int, int, int, byte[], int, int)' on a null object reference
08-24 07:47:54.688: E/AndroidRuntime(4208): at cn.wch.ch34xuartdriver.CH34xUARTDriver.a(Unknown Source)
08-24 07:47:54.688: E/AndroidRuntime(4208): at cn.wch.ch34xuartdriver.CH34xUARTDriver.UartInit(Unknown Source)
08-24 07:47:54.688: E/AndroidRuntime(4208): at com.example.c6zdh.MyAppLication.initUSB(MyAppLication.java:62)
08-24 07:47:54.688: E/AndroidRuntime(4208): at com.example.c6zdh.MyAppLication.onCreate(MyAppLication.java:31)
08-24 07:47:54.688: E/AndroidRuntime(4208): at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:1011)
08-24 07:47:54.688: E/AndroidRuntime(4208): at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4518)
08-24 07:47:54.688: E/AndroidRuntime(4208): ... 9 more
问题同上：官方demo，USB一直插在安卓上，打开APP，报错。查看日志为：
08-24 07:47:54.336: I/art(4208): Not late-enabling -Xcheck:jni (already on)
08-24 07:47:54.677: D/CH34xAndroidDriver(4208): String.format not match
08-24 07:47:54.677: D/CH34xAndroidDriver(4208): String.format not match
08-24 07:47:54.678: D/CH34xAndroidDriver(4208): String.format not match
08-24 07:47:54.678: D/CH34xAndroidDriver(4208): String.format not match
08-24 07:47:54.678: D/CH34xAndroidDriver(4208): String.format not match
08-24 07:47:54.678: D/CH34xAndroidDriver(4208): String.format not match
08-24 07:47:54.678: D/CH34xAndroidDriver(4208): String.format not match
08-24 07:47:54.681: D/AndroidRuntime(4208): Shutting down VM
08-24 07:47:54.688: E/AndroidRuntime(4208): FATAL EXCEPTION: main
08-24 07:47:54.688: E/AndroidRuntime(4208): Process: com.example.c6zdh, PID: 4208
08-24 07:47:54.688: E/AndroidRuntime(4208): java.lang.RuntimeException: Unable to create application com.example.c6zdh.MyAppLication: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.hardware.usb.UsbDeviceConnection.controlTransfer(int, int, int, int, byte[], int, int)' on a null object reference
08-24 07:47:54.688: E/AndroidRuntime(4208): at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4521)
08-24 07:47:54.688: E/AndroidRuntime(4208): at android.app.ActivityThread.access$1500(ActivityThread.java:144)
08-24 07:47:54.688: E/AndroidRuntime(4208): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1339)
08-24 07:47:54.688: E/AndroidRuntime(4208): at android.os.Handler.dispatchMessage(Handler.java:102)
08-24 07:47:54.688: E/AndroidRuntime(4208): at android.os.Looper.loop(Looper.java:135)
08-24 07:47:54.688: E/AndroidRuntime(4208): at android.app.ActivityThread.main(ActivityThread.java:5221)
08-24 07:47:54.688: E/AndroidRuntime(4208): at java.lang.reflect.Method.invoke(Native Method)
08-24 07:47:54.688: E/AndroidRuntime(4208): at java.lang.reflect.Method.invoke(Method.java:372)
08-24 07:47:54.688: E/AndroidRuntime(4208): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
08-24 07:47:54.688: E/AndroidRuntime(4208): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
08-24 07:47:54.688: E/AndroidRuntime(4208): Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.hardware.usb.UsbDeviceConnection.controlTransfer(int, int, int, int, byte[], int, int)' on a null object reference
08-24 07:47:54.688: E/AndroidRuntime(4208): at cn.wch.ch34xuartdriver.CH34xUARTDriver.a(Unknown Source)
08-24 07:47:54.688: E/AndroidRuntime(4208): at cn.wch.ch34xuartdriver.CH34xUARTDriver.UartInit(Unknown Source)
08-24 07:47:54.688: E/AndroidRuntime(4208): at com.example.c6zdh.MyAppLication.initUSB(MyAppLication.java:62)
08-24 07:47:54.688: E/AndroidRuntime(4208): at com.example.c6zdh.MyAppLication.onCreate(MyAppLication.java:31)
08-24 07:47:54.688: E/AndroidRuntime(4208): at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:1011)
08-24 07:47:54.688: E/AndroidRuntime(4208): at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4518)
08-24 07:47:54.688: E/AndroidRuntime(4208): ... 9 more
您好：
尝试使用一下，如下链接中的APP，看下使用结果。
CH341SER_ANDROID.ZIP下载页面-江苏沁恒股份有限公司
/download/CH341SER_ANDROID_ZIP.html
引用:
问题同上：官方demo，USB一直插在安卓上，打开APP，报错。查看日志为：
08-24 07:47:54.336: I/art(4208): Not late-enabling -Xcheck:jni (already on)
08-24 07:47:54.677: D/CH34xAndroidDriver(4208): String.format not match
08-24 07:47:54.677: D/CH34xAndroidDriver(4208): String.format not match
08-24 07:47:54.678: D/CH34xAndroidDriver(4208): String.format not match
08-24 07:47:54.678: D/CH34xAndroidDriver(4208): String.format not match
08-24 07:47:54.678: D/CH34xAndroidDriver(4208): String.format not match
08-24 07:47:54.678: D/CH34xAndroidDriver(4208): String.format not match
08-24 07:47:54.678: D/CH34xAndroidDriver(4208): String.format not match
08-24 07:47:54.681: D/AndroidRuntime(4208): Shutting down VM
08-24 07:47:54.688: E/AndroidRuntime(4208): FATAL EXCEPTION: main
08-24 07:47:54.688: E/AndroidRuntime(4208): Process: com.example.c6zdh, PID: 4208
08-24 07:47:54.688: E/AndroidRuntime(4208): java.lang.RuntimeException: Unable to create application com.example.c6zdh.MyAppLication: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.hardware.usb.UsbDeviceConnection.controlTransfer(int, int, int, int, byte[], int, int)' on a null object reference
08-24 07:47:54.688: E/AndroidRuntime(4208): at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4521)
08-24 07:47:54.688: E/AndroidRuntime(4208): at android.app.ActivityThread.access$1500(ActivityThread.java:144)
08-24 07:47:54.688: E/AndroidRuntime(4208): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1339)
08-24 07:47:54.688: E/AndroidRuntime(4208): at android.os.Handler.dispatchMessage(Handler.java:102)
08-24 07:47:54.688: E/AndroidRuntime(4208): at android.os.Looper.loop(Looper.java:135)
08-24 07:47:54.688: E/AndroidRuntime(4208): at android.app.ActivityThread.main(ActivityThread.java:5221)
08-24 07:47:54.688: E/AndroidRuntime(4208): at java.lang.reflect.Method.invoke(Native Method)
08-24 07:47:54.688: E/AndroidRuntime(4208): at java.lang.reflect.Method.invoke(Method.java:372)
08-24 07:47:54.688: E/AndroidRuntime(4208): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
08-24 07:47:54.688: E/AndroidRuntime(4208): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
08-24 07:47:54.688: E/AndroidRuntime(4208): Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.hardware.usb.UsbDeviceConnection.controlTransfer(int, int, int, int, byte[], int, int)' on a null object reference
08-24 07:47:54.688: E/AndroidRuntime(4208): at cn.wch.ch34xuartdriver.CH34xUARTDriver.a(Unknown Source)
08-24 07:47:54.688: E/AndroidRuntime(4208): at cn.wch.ch34xuartdriver.CH34xUARTDriver.UartInit(Unknown Source)
08-24 07:47:54.688: E/AndroidRuntime(4208): at com.example.c6zdh.MyAppLication.initUSB(MyAppLication.java:62)
08-24 07:47:54.688: E/AndroidRuntime(4208): at com.example.c6zdh.MyAppLication.onCreate(MyAppLication.java:31)
08-24 07:47:54.688: E/AndroidRuntime(4208): at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:1011)
08-24 07:47:54.688: E/AndroidRuntime(4208): at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4518)
08-24 07:47:54.688: E/AndroidRuntime(4208): ... 9 more
您好：
尝试使用一下，如下链接中的APP，看下使用结果。
CH341SER_ANDROID.ZIP下载页面-江苏沁恒股份有限公司
/download/CH341SER_ANDROID_ZIP.html
使用官方的APP，重新插拔USB，发现一直弹出未授权权限。
有没有更换过手机，如果一直不弹出权限，可能是当前系统没有使能 usb host 造成的。
有没有更换过手机，如果一直不弹出权限，可能是当前系统没有使能 usb host 造成的。
没更换过，我们使用的是友善之臂的4412的开发板，问题是和LZ提到的一样，重新开机后，USB必须要重新插拔一次才可以使用！
有没有更换过手机，如果一直不弹出权限，可能是当前系统没有使能 usb host 造成的。
Android系统支持usb host，我是这么确认支持的，外接无线鼠标和键盘，都OK可以使用
引用:
有没有更换过手机，如果一直不弹出权限，可能是当前系统没有使能 usb host 造成的。
Android系统支持usb host，我是这么确认支持的，外接无线鼠标和键盘，都OK可以使用
您好：
这样是只能确保支持OTG，也即USB主机功能，不能保证手机上的Host API support 功能打开，可以参考下列博客：http://blog.csdn.net/jazzsoldier/article/details/71097697
我按照教程查看
其中哪一条是可以证明的Host API support 功能打开，劳烦大神了
我按照教程查看
其中哪一条是可以证明的Host API support 功能打开，劳烦大神了
使用步骤一推荐的APK：USB主机诊断，或者按照步骤二的说明：进入/system/lib ，查看是否有驱动 libusbhost.so
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