AndroidStudio USB：EXTRA_PERMISSION_GRANTED 返回 false - 始终

Question

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 {
public static final String ACTION_USB_PERMISSION = "com.example.usbtestapp.USB_PERMISSION";
static final int intentFlags = (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) ? PendingIntent.FLAG_IMMUTABLE : 0;
static final int MY_CAMERA_PERMISSION_CODE  = 100;
private Context ContextofMainAcitivity;
public IntentFilter USBconnectdisconnect_intentFilter;
public Intent GetEXTRA_PERMISSION_GRANTEDIntent;
public PendingIntent current_usbpermissionIntent;
public UsbDevice current_usbdevice;
public UsbManager current_usbManager;
private static final String TAG = "usbtestapp";
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    ContextofMainAcitivity = this;
    current_usbManager = (UsbManager)getSystemService(Context.USB_SERVICE);
    USBconnectdisconnect_intentFilter = new IntentFilter();
    USBconnectdisconnect_intentFilter.addAction(ACTION_USB_PERMISSION);
    USBconnectdisconnect_intentFilter.addAction(UsbManager.ACTION_USB_DEVICE_ATTACHED);
    USBconnectdisconnect_intentFilter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED);
    registerReceiver(currentUSBBroasdcastReceiver, USBconnectdisconnect_intentFilter);
    GetEXTRA_PERMISSION_GRANTEDIntent = new Intent(ACTION_USB_PERMISSION);
    GetEXTRA_PERMISSION_GRANTEDIntent.putExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false);
    Log.v(TAG, "Waiting for USB devices...");
} // create

BroadcastReceiver currentUSBBroasdcastReceiver = new BroadcastReceiver() {
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        switch (action) {
            case UsbManager.ACTION_USB_DEVICE_ATTACHED:
                current_usbdevice = intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
                Log.v(TAG,"ACTION_USB_DEVICE_ATTACHED.");
                if (current_usbManager.hasPermission(current_usbdevice)) {
                    Log.v(TAG,"Permission is already granted.");
                    return;
                }
                current_usbpermissionIntent = PendingIntent.getBroadcast(ContextofMainAcitivity, 0, GetEXTRA_PERMISSION_GRANTEDIntent , intentFlags);
                if (!current_usbManager.hasPermission(current_usbdevice)) {
                    Log.v(TAG,  "Request Permision from User...");
                    current_usbManager.requestPermission(current_usbdevice, current_usbpermissionIntent);
                }
                break;
            case UsbManager.ACTION_USB_DEVICE_DETACHED:
                Log.v(TAG,"ACTION_USB_DEVICE_DETACHED");
                break;
            case ACTION_USB_PERMISSION:
                if (intent.getBooleanExtra( UsbManager.EXTRA_PERMISSION_GRANTED, false) == true) {
                    Log.v(TAG,"ACTION_USB_PERMISSION - Granted !");
                } else {
                    Log.v(TAG,"ACTION_USB_PERMISSION - Denied");
                }
                break;
        } //switch
    } // onReceive
}; // braadcast

} // 类

连接 FTDI FT232 - CDC 设备后，会发生以下情况：

2022-08-07 14:19:44.206 15767-15767/com.social.usbtestapp V/usbtestapp：正在等待 USB 设备...

2022-08-07 14:19:50.765 15767-15767/com.social.usbtestapp V/usbtestapp：ACTION_USB_DEVICE_ATTACHED。

2022-08-07 14:19:50.770 15767-15767/com.social.usbtestapp V/usbtestapp：请求用户许可...

然后弹出一个对话框并显示设备字符串+请求用户许可 – 无论选择什么“确定”或“取消”，结果始终是：

2022-08-07 14:19:52.759 15767-15767/com.social.usbtestapp V/usbtestapp：ACTION_USB_PERMISSION – 被拒绝

我还检查了 FTDI 示例，但最终根据我的理解，它们的内部功能几乎相同。我还检查了 StackOverflow java - UsbDevice requestPermission 被拒绝而不显示请求对话框提示 - 堆栈内存溢出，但这并没有解决我的问题。

出于任何未知的原因，我也让这个工作正常，这意味着在权限对话框中选择“确定”后， getBooleanExtra( UsbManager.EXTRA_PERMISSION_GRANTED 确实是 true 同时添加或删除一些额外的 SDK，例如 Lolipop 或 Pie，但我无法再重现它 - 如果有任何建议，我会很高兴。

Answer 1

在intentFlags初始化中将PendingIntent.FLAG_IMMUTABLE更改为PendingIntent.FLAG_MUTABLE。我不知道为什么它必须是 FLAG_MUTABLE 但它解决了我的问题。

Answer 2

有人可以提供一个关于如何使用具有明确意图的 PendingIntent 和广播接收器的示例吗？我试过了：

Intent intent = new Intent(m_context, MyBroadcastReceiver.class);
intent.setAction(ACTION_USB_PERMISSION);
PendingIntent permissionIntent = PendingIntent.getBroadcast(m_context, 0, intent, PendingIntent.FLAG_MUTABLE);
IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION);
m_context.registerReceiver(mUsbReceiver, filter, Context.RECEIVER_NOT_EXPORTED);

但是只有 USB_DEVICE_ATTACHED 事件到达 MyBroadcastReceiver，而不是权限事件（尽管按下“确定”时似乎已授予权限，因为下次我启动应用程序时它已获得权限）。