小编Qwe*_*zVI的帖子

我想使用以下代码 (AndroidStudio Chipmunk) 将 USB CDC 设备（FTDI 芯片或 CD2010 或定制芯片）连接到我的 Galaxy A12 (Android SDK 30)：

public class MainActivity extends AppCompatActivity {\npublic static final String ACTION_USB_PERMISSION = "com.example.usbtestapp.USB_PERMISSION";\nstatic final int intentFlags = (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) ? PendingIntent.FLAG_IMMUTABLE : 0;\nstatic final int MY_CAMERA_PERMISSION_CODE  = 100;\nprivate Context ContextofMainAcitivity;\npublic IntentFilter USBconnectdisconnect_intentFilter;\npublic Intent GetEXTRA_PERMISSION_GRANTEDIntent;\npublic PendingIntent current_usbpermissionIntent;\npublic UsbDevice current_usbdevice;\npublic UsbManager current_usbManager;\nprivate static final String TAG = "usbtestapp";\n@Override\nprotected void onCreate(Bundle savedInstanceState) {\n    super.onCreate(savedInstanceState);\n    setContentView(R.layout.activity_main);\n    ContextofMainAcitivity = this;\n    current_usbManager = (UsbManager)getSystemService(Context.USB_SERVICE);\n    USBconnectdisconnect_intentFilter = new IntentFilter();\n    USBconnectdisconnect_intentFilter.addAction(ACTION_USB_PERMISSION);\n    USBconnectdisconnect_intentFilter.addAction(UsbManager.ACTION_USB_DEVICE_ATTACHED);\n …