Question

我想在行业中使用android，

我可以使用slickdevlabs.com库连接到Profilic和Ftdi USB转串口芯片，没有任何问题。

应用程序有一个服务，它在启动时启动，连接到USB串口并执行其他操作。

我的问题是主机设备没有与用户进行任何交互，

所以当android问到

允许应用＆＃34; MyAPP＆＃34;访问USB设备？ [选中标记]默认使用此USB设备取消确定没有人可以点击确定。

即使我默认选中使用...复选框，如果我重新插入USB，或重新启动主机设备，它会在下次启动时再次询问。

并在此链接中提及答案： bypass android usb host permission confirmation dialog 但代码适用于：＆＃34;请注意，这些类的接口可能会根据Android的版本而改变。在我的情况下，版本是4.0.3。因此，如果您有另一个版本的Android并且此代码无法运行，则必须检查特定操作系统版本的源代码。＆＃34;

所以我需要为Android 5.1提供相同的代码

Answer 1

您是否尝试过使用Manifest中的intent-filter，如下所述：https://developer.android.com/guide/topics/connectivity/usb/host.html#using-intents

我遇到了类似的问题 - 似乎如果您以编程方式请求USB权限，它会忽略勾选的复选框并再次询问您。

修改如果由于服务而遇到问题，您可能也想阅读此内容：https://stackoverflow.com/a/15151075/3540885

Answer 2

自从您问这个问题已经有一段时间了...但是如果可以帮助某人，这是我的答案。

最初问题中接受的答案指出：

因此，如果您使用的是其他版本的Android，并且此代码不起作用，则必须检查特定版本OS的源代码。

因此，您应该直接从android源代码获取所需的文件。您可以download相对于您的版本的源代码，也可以直接浏览from the repo。

您要搜索的IUsbManager界面通常位于以下位置： / frameworks / base / android-branch-name / core / java / android / hardware / usb。至于服务管理器，可以在以下位置找到： / frameworks / base / android-branch-name / core / java / android / os /

我没有发布代码，因为我想您已经2年以上不再搜索它了：）

===编辑===

根据要求，这里是代码。我使它适用于6.0.0版，但我认为函数调用与5.1相同。待验证。

首先，这是您将获得的android项目结构：

在android.harware.usb中创建IUsbManager.java接口：

package android.hardware.usb;

public interface IUsbManager extends android.os.IInterface
{
    /** Local-side IPC implementation stub class. */
    public static abstract class Stub extends android.os.Binder implements android.hardware.usb.IUsbManager
    {
        /** Construct the stub at attach it to the interface. */
        public Stub()
        {
            throw new RuntimeException( "Stub!" );
        }
        /**
         * Cast an IBinder object into an android.hardware.usb.IUsbManager interface,
         * generating a proxy if needed.
         */
        public static android.hardware.usb.IUsbManager asInterface( android.os.IBinder obj )
        {
            throw new RuntimeException( "Stub!" );
        }

        public android.os.IBinder asBinder()
        {
            throw new RuntimeException( "Stub!" );
        }

        public boolean onTransact( int code, android.os.Parcel data, android.os.Parcel reply, int flags ) throws android.os.RemoteException
        {
            throw new RuntimeException( "Stub!" );
        }

        static final int TRANSACTION_getDeviceList = (android.os.IBinder.FIRST_CALL_TRANSACTION + 0);
        static final int TRANSACTION_openDevice = (android.os.IBinder.FIRST_CALL_TRANSACTION + 1);
        static final int TRANSACTION_getCurrentAccessory = (android.os.IBinder.FIRST_CALL_TRANSACTION + 2);
        static final int TRANSACTION_openAccessory = (android.os.IBinder.FIRST_CALL_TRANSACTION + 3);
        static final int TRANSACTION_setDevicePackage = (android.os.IBinder.FIRST_CALL_TRANSACTION + 4);
        static final int TRANSACTION_setAccessoryPackage = (android.os.IBinder.FIRST_CALL_TRANSACTION + 5);
        static final int TRANSACTION_hasDevicePermission = (android.os.IBinder.FIRST_CALL_TRANSACTION + 6);
        static final int TRANSACTION_hasAccessoryPermission = (android.os.IBinder.FIRST_CALL_TRANSACTION + 7);
        static final int TRANSACTION_requestDevicePermission = (android.os.IBinder.FIRST_CALL_TRANSACTION + 8);
        static final int TRANSACTION_requestAccessoryPermission = (android.os.IBinder.FIRST_CALL_TRANSACTION + 9);
        static final int TRANSACTION_grantDevicePermission = (android.os.IBinder.FIRST_CALL_TRANSACTION + 10);
        static final int TRANSACTION_grantAccessoryPermission = (android.os.IBinder.FIRST_CALL_TRANSACTION + 11);
        static final int TRANSACTION_hasDefaults = (android.os.IBinder.FIRST_CALL_TRANSACTION + 12);
        static final int TRANSACTION_clearDefaults = (android.os.IBinder.FIRST_CALL_TRANSACTION + 13);
        static final int TRANSACTION_setCurrentFunction = (android.os.IBinder.FIRST_CALL_TRANSACTION + 14);
        static final int TRANSACTION_setMassStorageBackingFile = (android.os.IBinder.FIRST_CALL_TRANSACTION + 15);
    }

    /* Returns a list of all currently attached USB devices */
    public void getDeviceList( android.os.Bundle devices ) throws android.os.RemoteException;
    /* Returns a file descriptor for communicating with the USB device.
     * The native fd can be passed to usb_device_new() in libusbhost.
     */
    public android.os.ParcelFileDescriptor openDevice( java.lang.String deviceName ) throws android.os.RemoteException;
    /* Returns the currently attached USB accessory */
    public android.hardware.usb.UsbAccessory getCurrentAccessory() throws android.os.RemoteException;
    /* Returns a file descriptor for communicating with the USB accessory.
     * This file descriptor can be used with standard Java file operations.
     */
    public android.os.ParcelFileDescriptor openAccessory( android.hardware.usb.UsbAccessory accessory ) throws android.os.RemoteException;
    /* Sets the default package for a USB device
     * (or clears it if the package name is null)
     */
    public void setDevicePackage(android.hardware.usb.UsbDevice device, java.lang.String packageName, int userId) throws android.os.RemoteException;
    /* Sets the default package for a USB accessory
     * (or clears it if the package name is null)
     */
    public void setAccessoryPackage( android.hardware.usb.UsbAccessory accessory, java.lang.String packageName ) throws android.os.RemoteException;
    /* Returns true if the caller has permission to access the device. */
    public boolean hasDevicePermission(android.hardware.usb.UsbDevice device) throws android.os.RemoteException;
    /* Returns true if the caller has permission to access the accessory. */
    public boolean hasAccessoryPermission( android.hardware.usb.UsbAccessory accessory ) throws android.os.RemoteException;
    /* Requests permission for the given package to access the device.
     * Will display a system dialog to query the user if permission
     * had not already been given.
     */
    public void requestDevicePermission( android.hardware.usb.UsbDevice device, java.lang.String packageName, android.app.PendingIntent pi ) throws android.os.RemoteException;
    /* Requests permission for the given package to access the accessory.
     * Will display a system dialog to query the user if permission
     * had not already been given. Result is returned via pi.
     */
    public void requestAccessoryPermission( android.hardware.usb.UsbAccessory accessory, java.lang.String packageName, android.app.PendingIntent pi ) throws android.os.RemoteException;
    /* Grants permission for the given UID to access the device */
    public void grantDevicePermission( android.hardware.usb.UsbDevice device, int uid ) throws android.os.RemoteException;
    /* Grants permission for the given UID to access the accessory */
    public void grantAccessoryPermission( android.hardware.usb.UsbAccessory accessory, int uid ) throws android.os.RemoteException;
    /* Returns true if the USB manager has default preferences or permissions for the package */
    public boolean hasDefaults( java.lang.String packageName ) throws android.os.RemoteException;
    /* Clears default preferences and permissions for the package */
    public void clearDefaults( java.lang.String packageName ) throws android.os.RemoteException;
    /* Sets the current USB function. */
    public void setCurrentFunction( java.lang.String function, boolean makeDefault ) throws android.os.RemoteException;
    /* Sets the file path for USB mass storage backing file. */
    public void setMassStorageBackingFile( java.lang.String path ) throws android.os.RemoteException;


}

然后在android.os中创建Java类ServiceManager.java：

package android.os;

import java.util.Map;

public final class ServiceManager
{
    public static IBinder getService( String name )
    {
        throw new RuntimeException( "Stub!" );
    }

    /**
     * Place a new @a service called @a name into the service
     * manager.
     *
     * @param name the name of the new service
     * @param service the service object
     */
    public static void addService( String name, IBinder service )
    {
        throw new RuntimeException( "Stub!" );
    }

    /**
     * Retrieve an existing service called @a name from the
     * service manager.  Non-blocking.
     */
    public static IBinder checkService( String name )
    {
        throw new RuntimeException( "Stub!" );
    }

    public static String[] listServices() throws RemoteException
    {
        throw new RuntimeException( "Stub!" );
    }

    /**
     * This is only intended to be called when the process is first being brought
     * up and bound by the activity manager. There is only one thread in the process
     * at that time, so no locking is done.
     *
     * @param cache the cache of service references
     * @hide
     */
    public static void initServiceCache( Map<String, IBinder> cache )
    {
        throw new RuntimeException( "Stub!" );
    }
}

一旦完成，别忘了在AndroidManifest中添加android.permission.MANAGE_USB。

然后您可以使用这些函数调用：

/**
 * Verify if the application is a system app and has MANAGE_USB permission
 * before granting the USB permission for you specific USB devices
 */
private void manageUSBPermissions() {
    if ((this.getApplicationInfo().flags & ApplicationInfo.FLAG_SYSTEM) != 0) {
        Log.i(TAG,"This is a system application");
        if (getApplicationContext().checkCallingOrSelfPermission("android.permission.MANAGE_USB") == PackageManager.PERMISSION_GRANTED) {
            Log.i(TAG,"I have android.permission.MANAGE_USB");
            grantUsbPermissions();
        } else {
            Log.i(TAG,"I do not have android.permission.MANAGE_USB");
        }
    } else {
        Log.i(TAG,"This is not a system application");
    }
}

/**
 * This is to avoid the android usb host permission confirmation dialog
 * The application need to be a system app and have MANAGE_USB permission for it to work
 */
private void grantUsbPermissions() {
    try {
        PackageManager pm = getPackageManager();
        ApplicationInfo ai = pm.getApplicationInfo( "com.your.package", 0 );
        if( ai != null ) {
            UsbManager manager = (UsbManager) getSystemService( Context.USB_SERVICE );
            IBinder b = ServiceManager.getService( Context.USB_SERVICE );
            IUsbManager service = IUsbManager.Stub.asInterface( b );

            HashMap<String, UsbDevice> deviceList = manager.getDeviceList();
            Iterator<UsbDevice> deviceIterator = deviceList.values().iterator();
            while( deviceIterator.hasNext() ) {
                UsbDevice device = deviceIterator.next();
                if ( device.getVendorId() == 0x1234 ) {
                    service.grantDevicePermission( device, ai.uid );
                    service.setDevicePackage( device, "com.your.package", ai.uid );
                }
            }
        }
    }
    catch ( Exception e ) {
        Log.e(TAG, "Error granting USB permissions: " + e);
    }
}

正在检查您的应用程序是否是系统应用程序，以及是否具有正确的权限，否则它将无法正常工作。

另外请注意，您的供应商ID不是十六进制而是十进制。

绕过Android 5.1的android usb主机权限确认对话框

2 个答案: