usb-host一步一步学（二）安卓在usb-host模式下列出当前连接的usb设备

之前写了一个简单的例子usb-host一步一步学（一）安卓在usb-host模式下列出当前连接的usb设备，下面的这个例子是获取各种usb设备、usb接口以及usb连接点(endpoint)

正如上一章节提到的那样，为了指定应用程序以usb-host模式运行，在AndroidManifest.xml文件中需要添加<uses-feature
android:name="android.hardware.usb.host">并且修改安卓的minSDKVersion="12"

MainActivity.java

package com.example.androidusbhost;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;

import android.hardware.usb.UsbConstants;
import android.hardware.usb.UsbDevice;
import android.hardware.usb.UsbEndpoint;
import android.hardware.usb.UsbInterface;
import android.hardware.usb.UsbManager;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;
import android.widget.TextView;
import android.app.Activity;
import android.content.Context;

public class MainActivity extends Activity {

 Button btnCheck;
 TextView textInfo;
 TextView textInfoInterface;
 TextView textEndPoint;

 Spinner spDeviceName;
 ArrayList<String> listDeviceName;
 ArrayList<UsbDevice> listUsbDevice;
 ArrayAdapter<String> adapterDevice;

 Spinner spInterface;
 ArrayList<String> listInterface;
 ArrayList<UsbInterface> listUsbInterface;
 ArrayAdapter<String> adapterInterface;

 Spinner spEndPoint;
 ArrayList<String> listEndPoint;
 ArrayList<UsbEndpoint> listUsbEndpoint;
 ArrayAdapter<String> adapterEndpoint;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);

  spDeviceName = (Spinner)findViewById(R.id.spinnerdevicename);
  spInterface = (Spinner)findViewById(R.id.spinnerinterface);
  spEndPoint = (Spinner)findViewById(R.id.spinnerendpoint);
  textInfo = (TextView) findViewById(R.id.info);
  textInfoInterface = (TextView)findViewById(R.id.infointerface);
  textEndPoint = (TextView)findViewById(R.id.infoendpoint);

  btnCheck = (Button) findViewById(R.id.check);
  btnCheck.setOnClickListener(new OnClickListener() {

   @Override
   public void onClick(View arg0) {
    checkDeviceInfo();
   }
  });
 }

 private void checkDeviceInfo() {

  listDeviceName = new ArrayList<String>();
  listUsbDevice = new ArrayList<UsbDevice>();

  UsbManager manager = (UsbManager) getSystemService(Context.USB_SERVICE);
  HashMap<String, UsbDevice> deviceList = manager.getDeviceList();
  Iterator<UsbDevice> deviceIterator = deviceList.values().iterator();

  while (deviceIterator.hasNext()) {
   UsbDevice device = deviceIterator.next();
   listDeviceName.add(device.getDeviceName());
   listUsbDevice.add(device);

  }

  textInfo.setText("");
  textInfoInterface.setText("");
  textEndPoint.setText("");

  adapterDevice = new ArrayAdapter<String>(this,
    android.R.layout.simple_spinner_item, listDeviceName);
  adapterDevice.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
  spDeviceName.setAdapter(adapterDevice);
  spDeviceName.setOnItemSelectedListener(deviceOnItemSelectedListener);
 }

 OnItemSelectedListener deviceOnItemSelectedListener =
   new OnItemSelectedListener(){

  @Override
  public void onItemSelected(AdapterView<?> parent,
    View view, int position, long id) {
   UsbDevice device = listUsbDevice.get(position);

   String i = device.toString() + "\n" +
     "DeviceID: " + device.getDeviceId() + "\n" +
     "DeviceName: " + device.getDeviceName() + "\n" +
     "DeviceClass: " + device.getDeviceClass() + " - "
      + translateDeviceClass(device.getDeviceClass()) + "\n" +
     "DeviceSubClass: " + device.getDeviceSubclass() + "\n" +
     "VendorID: " + device.getVendorId() + "\n" +
     "ProductID: " + device.getProductId() + "\n" +
     "InterfaceCount: " + device.getInterfaceCount();
   textInfo.setText(i);

   checkUsbDevicve(device);
  }

  @Override
  public void onNothingSelected(AdapterView<?> parent) {}

 };

 private void checkUsbDevicve(UsbDevice d) {
  listInterface = new ArrayList<String>();
  listUsbInterface = new ArrayList<UsbInterface>();

  for(int i=0; i<d.getInterfaceCount(); i++){
   UsbInterface usbif = d.getInterface(i);
   listInterface.add(usbif.toString());
   listUsbInterface.add(usbif);
  }

  adapterInterface = new ArrayAdapter<String>(this,
    android.R.layout.simple_spinner_item, listInterface);
  adapterDevice.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
  spInterface.setAdapter(adapterInterface);
  spInterface.setOnItemSelectedListener(interfaceOnItemSelectedListener);
 }

 OnItemSelectedListener interfaceOnItemSelectedListener =
   new OnItemSelectedListener(){

  @Override
  public void onItemSelected(AdapterView<?> parent,
    View view, int position, long id) {

   UsbInterface selectedUsbIf = listUsbInterface.get(position);

   String sUsbIf = "\n" + selectedUsbIf.toString() + "\n"
     + "Id: " + selectedUsbIf.getId() + "\n"
     + "InterfaceClass: " + selectedUsbIf.getInterfaceClass() + "\n"
     + "InterfaceProtocol: " + selectedUsbIf.getInterfaceProtocol() + "\n"
     + "InterfaceSubclass: " + selectedUsbIf.getInterfaceSubclass() + "\n"
     + "EndpointCount: " + selectedUsbIf.getEndpointCount();

   textInfoInterface.setText(sUsbIf);
   checkUsbInterface(selectedUsbIf);
  }

  @Override
  public void onNothingSelected(AdapterView<?> parent) {}

 };

 private void checkUsbInterface(UsbInterface uif) {
  listEndPoint = new ArrayList<String>();
  listUsbEndpoint = new ArrayList<UsbEndpoint>();

  for(int i=0; i<uif.getEndpointCount(); i++){
   UsbEndpoint usbEndpoint = uif.getEndpoint(i);
   listEndPoint.add(usbEndpoint.toString());
   listUsbEndpoint.add(usbEndpoint);
  }

  adapterEndpoint = new ArrayAdapter<String>(this,
    android.R.layout.simple_spinner_item, listEndPoint);
  adapterEndpoint.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
  spEndPoint.setAdapter(adapterEndpoint);
  spEndPoint.setOnItemSelectedListener(endpointOnItemSelectedListener);
 }

 OnItemSelectedListener endpointOnItemSelectedListener =
   new OnItemSelectedListener(){

  @Override
  public void onItemSelected(AdapterView<?> parent,
    View view, int position, long id) {

   UsbEndpoint selectedEndpoint = listUsbEndpoint.get(position);

   String sEndpoint = "\n" + selectedEndpoint.toString() + "\n"
    + translateEndpointType(selectedEndpoint.getType());

   textEndPoint.setText(sEndpoint);
  }

  @Override
  public void onNothingSelected(AdapterView<?> parent) {}

 };

 private String translateEndpointType(int type){
  switch(type){
  case UsbConstants.USB_ENDPOINT_XFER_CONTROL:
   return "USB_ENDPOINT_XFER_CONTROL (endpoint zero)";
  case UsbConstants.USB_ENDPOINT_XFER_ISOC:
   return "USB_ENDPOINT_XFER_ISOC (isochronous endpoint)";
  case UsbConstants.USB_ENDPOINT_XFER_BULK :
   return "USB_ENDPOINT_XFER_BULK (bulk endpoint)";
  case UsbConstants.USB_ENDPOINT_XFER_INT:
   return "USB_ENDPOINT_XFER_INT (interrupt endpoint)";
  default:
   return "unknown";
  }
 }

 private String translateDeviceClass(int deviceClass){
  switch(deviceClass){
  case UsbConstants.USB_CLASS_APP_SPEC:
   return "Application specific USB class";
  case UsbConstants.USB_CLASS_AUDIO:
   return "USB class for audio devices";
  case UsbConstants.USB_CLASS_CDC_DATA:
   return "USB class for CDC devices (communications device class)";
  case UsbConstants.USB_CLASS_COMM:
   return "USB class for communication devices";
  case UsbConstants.USB_CLASS_CONTENT_SEC:
   return "USB class for content security devices";
  case UsbConstants.USB_CLASS_CSCID:
   return "USB class for content smart card devices";
  case UsbConstants.USB_CLASS_HID:
   return "USB class for human interface devices (for example, mice and keyboards)";
  case UsbConstants.USB_CLASS_HUB:
   return "USB class for USB hubs";
  case UsbConstants.USB_CLASS_MASS_STORAGE:
   return "USB class for mass storage devices";
  case UsbConstants.USB_CLASS_MISC:
   return "USB class for wireless miscellaneous devices";
  case UsbConstants.USB_CLASS_PER_INTERFACE:
   return "USB class indicating that the class is determined on a per-interface basis";
  case UsbConstants.USB_CLASS_PHYSICA:
   return "USB class for physical devices";
  case UsbConstants.USB_CLASS_PRINTER:
   return "USB class for printers";
  case UsbConstants.USB_CLASS_STILL_IMAGE:
   return "USB class for still image devices (digital cameras)";
  case UsbConstants.USB_CLASS_VENDOR_SPEC:
   return "Vendor specific USB class";
  case UsbConstants.USB_CLASS_VIDEO:
   return "USB class for video devices";
  case UsbConstants.USB_CLASS_WIRELESS_CONTROLLER:
   return "USB class for wireless controller devices";
  default: return "Unknown USB class!";

  }
 }

}

布局文件activity_main.xml文件代码

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:autoLink="web"
        android:text="http://android-er.blogspot.com/"
        android:textStyle="bold" />

    <Button
        android:id="@+id/check"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Check USB devices" />

    <Spinner
        android:id="@+id/spinnerdevicename"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <Spinner
        android:id="@+id/spinnerinterface"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <Spinner
        android:id="@+id/spinnerendpoint"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical" >

            <TextView
                android:id="@+id/info"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" />

            <TextView
                android:id="@+id/infointerface"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:textStyle="italic" />

            <TextView
                android:id="@+id/infoendpoint"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:textStyle="bold" />
        </LinearLayout>
    </ScrollView>
</LinearLayout>