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>

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