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Thread: usb hid about communication

  1. #1
    Junior Member
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    Default usb hid about communication

    Hi ! ,I want to USB HID hardware communicates with android tablet but newbe java and android (good c#.net)


    -Question 1-knowledge of how to get the usb device attached to the tablet
    UsbDevice usbdeneme = getIntent().getParcelableExtra("usbdeneme"); - - -> I receive Null data

    -Question 2-"Parcelable" did not understand, is it true for "parcelable"

    -Question 3-Do you have a script file, you need to add manifest
    Ex: <uses-feature android:name="android.hardware.usb.host"/><uses-sdk

    -Question 4-How do I listen to a continuous data retrieval for USB HID

    - main code the following commands

    Java Code:

    package com.Usb_deneme;

    import android.os.Bundle;
    import android.app.Activity;
    import android.view.View;
    import android.view.View.OnClickListener;
    import android.widget.Button;
    import android.widget.TextView;

    public class MainActivity extends Activity {

    protected static final int Class = 0;
    Button button1;
    TextView textView1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    button1 = (Button) findViewById(R.id.button1);
    textView1 =(TextView) findViewById(R.id.textView1);


    button1.setOnClickListener(new OnClickListener() {


    @Override
    public void onClick(View v) {
    try{

    UsbDevice usbdeneme = getIntent().getParcelableExtra("usbdeneme");

    if (usbdeneme != null){
    textView1.setText("Success --> " + usbdeneme.toString());
    }
    }
    catch(Exception ex) {textView1.setText("Error --> "+ex.toString());}

    }
    });





    }


    }


    - usb device class the following commands
    Java Code:

    package com.Usb_deneme;
    import android.hardware.usb.UsbInterface;
    //import android.os.Bundle;
    import android.os.Parcel;
    import android.os.Parcelable;
    //import android.util.Log;

    //import java.io.FileDescriptor;

    /**
    * A class representing a USB device.
    */
    public class UsbDevice implements Parcelable {

    private static final String TAG = "UsbDevice";

    private final String mName;
    private final int mVendorId;
    private final int mProductId;
    private final int mClass;
    private final int mSubclass;
    private final int mProtocol;
    private final Parcelable[] mInterfaces;

    /**
    * UsbDevice should only be instantiated by UsbService implementation
    * @hide
    */
    public UsbDevice(String name, int vendorId, int productId,
    int Class, int subClass, int protocol, Parcelable[] interfaces) {
    mName = name;
    mVendorId = vendorId;
    mProductId = productId;
    mClass = Class;
    mSubclass = subClass;
    mProtocol = protocol;
    mInterfaces = interfaces;
    }

    /**
    * Returns the name of the device.
    * In the standard implementation, this is the path of the device file
    * for the device in the usbfs file system.
    *
    * @return the device name
    */
    public String getDeviceName() {
    return mName;
    }

    /**
    * Returns a unique integer ID for the device.
    * This is a convenience for clients that want to use an integer to represent
    * the device, rather than the device name.
    * IDs are not persistent across USB disconnects.
    *
    * @return the device ID
    */
    public int getDeviceId() {
    return getDeviceId(mName);
    }

    /**
    * Returns a vendor ID for the device.
    *
    * @return the device vendor ID
    */
    public int getVendorId() {
    return mVendorId;
    }

    /**
    * Returns a product ID for the device.
    *
    * @return the device product ID
    */
    public int getProductId() {
    return mProductId;
    }

    /**
    * Returns the devices's class field.
    * Some useful constants for USB device classes can be found in
    * {@link android.hardware.usb.UsbConstants}
    *
    * @return the devices's class
    */
    public int getDeviceClass() {
    return mClass;
    }

    /**
    * Returns the device's subclass field.
    *
    * @return the device's subclass
    */
    public int getDeviceSubclass() {
    return mSubclass;
    }

    /**
    * Returns the device's subclass field.
    *
    * @return the device's protocol
    */
    public int getDeviceProtocol() {
    return mProtocol;
    }

    /**
    * Returns the number of {@link android.hardware.usb.UsbInterface}s this device contains.
    *
    * @return the number of interfaces
    */
    public int getInterfaceCount() {
    return mInterfaces.length;
    }

    /**
    * Returns the {@link android.hardware.usb.UsbInterface} at the given index.
    *
    * @return the interface
    */
    public UsbInterface getInterface(int index) {
    return (UsbInterface)mInterfaces[index];
    }

    @Override
    public boolean equals(Object o) {
    if (o instanceof UsbDevice) {
    return ((UsbDevice)o).mName.equals(mName);
    } else if (o instanceof String) {
    return ((String)o).equals(mName);
    } else {
    return false;
    }
    }

    @Override
    public int hashCode() {
    return mName.hashCode();
    }

    @Override
    public String toString() {
    return "UsbDevice[mName=" + mName + ",mVendorId=" + mVendorId +
    ",mProductId=" + mProductId + ",mClass=" + mClass +
    ",mSubclass=" + mSubclass + ",mProtocol=" + mProtocol +
    ",mInterfaces=" + mInterfaces + "]";
    }

    public static final Parcelable.Creator<UsbDevice> CREATOR =
    new Parcelable.Creator<UsbDevice>() {
    public UsbDevice createFromParcel(Parcel in) {
    String name = in.readString();
    int vendorId = in.readInt();
    int productId = in.readInt();
    int clasz = in.readInt();
    int subClass = in.readInt();
    int protocol = in.readInt();
    Parcelable[] interfaces = in.readParcelableArray(UsbInterface.class.getClass Loader());
    return new UsbDevice(name, vendorId, productId, clasz, subClass, protocol, interfaces);
    }

    public UsbDevice[] newArray(int size) {
    return new UsbDevice[size];
    }
    };

    public int describeContents() {
    return 0;
    }

    public void writeToParcel(Parcel parcel, int flags) {
    parcel.writeString(mName);
    parcel.writeInt(mVendorId);
    parcel.writeInt(mProductId);
    parcel.writeInt(mClass);
    parcel.writeInt(mSubclass);
    parcel.writeInt(mProtocol);
    parcel.writeParcelableArray(mInterfaces, 0);
    }

    public static int getDeviceId(String name) {
    return native_get_device_id(name);
    }

    public static String getDeviceName(int id) {
    return native_get_device_name(id);
    }

    private static native int native_get_device_id(String name);
    private static native String native_get_device_name(int id);
    }


  2. #2
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    Default Re: usb hid about communication

    getParcelableExtra probably isn't what you want. Check out the USB Accessories API guide. You will need to install Google play services from the SDK manager and add this to the manifest:

    <uses-feature android:name="android.hardware.usb.accessory" />

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