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我试图让 android ADK 在我的活动的另一个包中的库中工作，为此我需要各种权限/实例。我尝试将活动上下文传递给函数，然后运行：

public void setup(Context context)
{
    mManager = UsbManager.getInstance(context);
    UsbAccessory[] accessoryList = mManager.getAccessoryList();
    PendingIntent mPermissionIntent = PendingIntent.getBroadcast(context, 0,
            new Intent(ACTION_USB_PERMISSION), 0);
    IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION);
    context.registerReceiver(mUsbReceiver, filter);
    mManager.requestPermission(accessoryList[0], mPermissionIntent);
    if (accessoryList[0] != null) {

        mAccessory = accessoryList[0];
        openAccessory(mAccessory);
    }
}

但这会使应用程序崩溃，即使除了第一行之外的所有内容都被注释掉了。我不完全确定我做错了什么，并希望得到任何帮助......（该函数被调用并传递“this”）

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1 回答 1

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What worked for me was checking if accessoryList is null before assigning element [0] to mAccessory.

    UsbAccessory mAccessory = (accessoryList == null ? null : accessoryList[0]);

Hope you sorted something out in the meantime.

于 2013-01-17T21:15:29.197 回答