Android USB串口通信实现 以及绕过USB弹框验证

Android USB串口通信实现:

1. 首先需要在AndroidManifest.xml文件中添加USB权限：

<uses-feature android:name="android.hardware.usb.host" />
<uses-permission android:name="android.permission.USB_PERMISSION" />

2. 获取USB设备权限：

private static final String ACTION_USB_PERMISSION = "com.android.example.USB_PERMISSION";
private UsbManager mUsbManager;
private PendingIntent mPermissionIntent;

private void requestPermission() {
    mUsbManager = (UsbManager) getSystemService(Context.USB_SERVICE);
    mPermissionIntent = PendingIntent.getBroadcast(this, 0, new Intent(ACTION_USB_PERMISSION), 0);
    IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION);
    registerReceiver(mUsbReceiver, filter);
    HashMap<String, UsbDevice> deviceList = mUsbManager.getDeviceList();
    for (UsbDevice device : deviceList.values()) {
        mUsbManager.requestPermission(device, mPermissionIntent);
    }
}

private final BroadcastReceiver mUsbReceiver = new BroadcastReceiver() {
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        if (ACTION_USB_PERMISSION.equals(action)) {
            synchronized (this) {
                UsbDevice device = (UsbDevice) intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
                if (intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false)) {
                    if (device != null) {
                        // 权限获取成功，进行USB通信
                    }
                } else {
                    // 权限获取失败
                }
            }
        }
    }
};

3. 进行USB通信：

private UsbDeviceConnection mConnection;
private UsbEndpoint mEndpointIn;
private UsbEndpoint mEndpointOut;

private void setupDevice(UsbDevice device) {
    mConnection = mUsbManager.openDevice(device);
    if (mConnection != null && mConnection.claimInterface(device.getInterface(0), true)) {
        UsbInterface intf = device.getInterface(0);
        for (int i = 0; i < intf.getEndpointCount(); i++) {
            UsbEndpoint endpoint = intf.getEndpoint(i);
            if (endpoint.getDirection() == UsbConstants.USB_DIR_IN) {
                mEndpointIn = endpoint;
            } else if (endpoint.getDirection() == UsbConstants.USB_DIR_OUT) {
                mEndpointOut = endpoint;
            }
        }
    } else {
        mConnection = null;
    }
}

private void sendData(byte[] data) {
    if (mConnection != null && mEndpointOut != null) {
        mConnection.bulkTransfer(mEndpointOut, data, data.length, TIMEOUT);
    }
}

private byte[] readData() {
    byte[] buffer = new byte[1024];
    if (mConnection != null && mEndpointIn != null) {
        mConnection.bulkTransfer(mEndpointIn, buffer, buffer.length, TIMEOUT);
    }
    return buffer;
}

绕过USB弹框验证：

1. 获取系统管理员权限：

public void getAdmin() {
    Intent intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);
    intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN, new ComponentName(this, AdminReceiver.class));
    startActivityForResult(intent, REQUEST_CODE_ADD_DEVICE_ADMIN);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == REQUEST_CODE_ADD_DEVICE_ADMIN && resultCode == RESULT_OK) {
        // 系统管理员权限获取成功
    }
}

2. 使用DevicePolicyManager方法进行操作：

private DevicePolicyManager mDpm;

private void disableUsbDialog() {
    mDpm = (DevicePolicyManager) getSystemService(Context.DEVICE_POLICY_SERVICE);
    ComponentName componentName = new ComponentName(this, AdminReceiver.class);
    mDpm.addUserRestriction(componentName, UserManager.DISALLOW_USB_FILE_TRANSFER);
}

private void enableUsbDialog() {
    mDpm.clearUserRestriction(new ComponentName(this, AdminReceiver.class), UserManager.DISALLOW_USB_FILE_TRANSFER);
}

其中，AdminReceiver类需要继承DeviceAdminReceiver，并在AndroidManifest.xml文件中进行注册。