Libusb库在Android下的使用例程

转载请注明：http://blog.csdn.net/hubbybob1/article/details/54863662
阅读本文前清先了解相关基础内容，操作步骤请阅读博客：libusb1.0在android内的移植和使用方法
在讲解了libusb库在Android下的移植和基本应用后，下面来讲解Libusb的Android工程；

其工程步骤：
1.建立带有JNI工程的eclipse工程，网上有很多教程
2.根据上一篇博客生成libusb.a库文件和相关头文件（libusb.h等）,并导入JNI工程.
3.编写Android.mk，可以通过ndk-build进行编译C文件到工程里面去如下所示：

LOCAL_PATH := $(call my-dir)include $(CLEAR_VARS)LOCAL_CFLAGS := -D__STDC_CONSTANT_MACROSCROSS_DIR  := /opt/gstreamerspice_objs := \            $(LOCAL_PATH)/libs/lib/libusb.aLOCAL_SRC_FILES := android-jni-interface.cLOCAL_LDLIBS += $(spice_objs) -llogLOCAL_C_INCLUDES += \        $(LOCAL_PATH)/libs/include/libusb \        $(CROSS_DIR)/include/glib-2.0 \        $(CROSS_DIR)/lib/glib-2.0/include#LOCAL_SHARED_LIBRARIES := libmyaudioLOCAL_MODULE := libxxtestinclude $(BUILD_SHARED_LIBRARY)

4.编写C文件并进行ndk-build编译，如下所示：

#include <jni.h>#include <android/log.h>#include <stddef.h>#include "libusb.h"#include <glib.h>#define LOG_TAG "MediaRecorder"#define LOG(...) __android_log_print(ANDROID_LOG_DEBUG,LOG_TAG, __VA_ARGS__)//#define FALSE 0JNIEXPORT void JNICALLJava_com_example_testcusejava_Testcusenative_libusbcallfunc(JNIEnv* env, jobject obj){    //openUsbDevice(4703,12587);    int rc,r;    libusb_device_handle *handle = NULL;    libusb_device *device;    libusb_context *ctx = NULL;     r = libusb_init(&ctx);//启动libusb     jclass class  = (*env)->FindClass (env, "com/example/testcusejava/Testcusenative");    jmethodID openUsbDevice = (*env)->GetStaticMethodID(env, class, "openUsbDevice", "(II)I");//GetStaticMethodID GetMethodID，通过jni获取Java的方法openUsbDevice    int fd =(*env)->CallStaticIntMethod(env, class,openUsbDevice ,4703,12587);//CallVoidMethod,CallStaticIntMethod调用openUsbDevice 获取fd    LOG("!!!!!一二三!!!!! fd = %d",fd);    __android_log_write(6, "android-service", "Trying to open USB device.get_usb_device_fd");    //rc = libusb_open_fd(device, &handle,fd);//打开usb设备    if (rc != 0) { __android_log_write(6, "channel-usbredir", "Failed to open USB device."); }    //libusb_close(handle);    libusb_exit(ctx); //结束libusb}

5.编写Java程序

package com.example.testcusejava;import java.io.IOException;import java.nio.ByteBuffer;import java.util.Collection;import java.util.HashMap;import java.util.Iterator;import com.example.testcusejava.R;import com.example.testcusejava.Testcusenative.MyThread2;import com.example.testcusejava.Testcusenative.MyThread3;import android.app.Activity;import android.app.PendingIntent;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.hardware.usb.UsbDevice;import android.hardware.usb.UsbDeviceConnection;import android.hardware.usb.UsbEndpoint;import android.hardware.usb.UsbInterface;import android.hardware.usb.UsbManager;import android.hardware.usb.UsbRequest;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.util.Log;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Toast;//bhw 2016.07.19 epublic class Testcusenative extends Activity {      public native void libusbfunc();// 调用native方法 static {        System.loadLibrary("xxtest");//加载ndk-build生成的libxxtest.so库    }    private Button button,button2;    private UsbManager usbManager;    private UsbDevice usbDevice;    private static final String ACTION_USB_PERMISSION = "com.android.example.USB_PERMISSION";    private PendingIntent pendingIntent;    static int fd = -1;    private Handler handler = new Handler(){        @Override        public void handleMessage(Message msg) {            // TODO Auto-generated method stub            super.handleMessage(msg);            switch (msg.what) {            case 3:                Toast.makeText(Testcusenative.this, "33333333333333333", 0).show();                break;            case 4:                Toast.makeText(Testcusenative.this, "44444444444444444", 0).show();                break;            }        }    };    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_testcusenative);                   try {            Process process = Runtime.getRuntime().exec("su");        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }           button = (Button) findViewById(R.id.buttonPlay);        usbManager = (UsbManager) getSystemService(Context.USB_SERVICE);            pendingIntent = PendingIntent.getBroadcast(this, 0, new Intent(ACTION_USB_PERMISSION), 0);        IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION);        registerReceiver(mUsbReceiver, filter);        button.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View arg0) {                // TODO Auto-generated method stub                Log.e("device","call MyThread2 ");                new MyThread2().start();            // libusbfunc();// 调用native方法 }        });    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.testcusenative, menu);        return true;    }    public static native void test();    static{         //System.loadLibrary("lianyinbao-jni");    }    class MyThread2 extends Thread{        @Override        public void run() {            // TODO Auto-generated method stub            super.run();            try {                UsbDevice ud= null;                //链接到设备的USB设备列表                HashMap map = usbManager.getDeviceList();                Collection usbDevices = map.values();                Iterator usbDeviceIter = usbDevices.iterator();                while (usbDeviceIter.hasNext()){                    ud = usbDeviceIter.next();                      //VendorID 和ProductID 十进制                     if(4703 == ud.getVendorId() && 12587 == ud.getProductId()){//vid pid 3141 25409 ; 4703 12587                   usbDevice = ud;                   Log.e("device","find device"); //bhw                     }                    //Log.e("device","find device"); //bhw                }                //检测USB设备权限受否授权                if(usbManager.hasPermission(usbDevice)){                    handler.sendEmptyMessage(3);                    new MyThread3().start();                    Log.e("device","usbManager.hasPermission");//bhw                }else{                    //如果没有授权就授予权限                    handler.sendEmptyMessage(4);                    usbManager.requestPermission(usbDevice, pendingIntent); //在此Android系统会弹出对话框，选择是否授予权限                     Log.e("device","usbManager.requestPermission");   //bhw                 }                           } catch (Exception e) {                // TODO Auto-generated catch block                e.printStackTrace();            }        }    }    class MyThread3 extends Thread{        @Override        public void run() {            // TODO Auto-generated method stub            super.run();            Log.e("device","MyThread3");//bhw            UsbDeviceConnection connection = usbManager.openDevice(usbDevice);                      fd = connection.getFileDescriptor();//获取文件描述符            Log.e("device","MyThread3 "+fd);                   jnicallfunc();//调用native方法 }    }    public static int openUsbDevice(int vid, int pid) throws InterruptedException {        Log.e("device","openUsbDevice "+fd);        return fd;    }    private final BroadcastReceiver mUsbReceiver = new BroadcastReceiver() {        public void onReceive(Context context, Intent intent) {            String action = intent.getAction();            Log.e( "action", action);            if (ACTION_USB_PERMISSION.equals(action)) {                synchronized (this) {                    usbDevice = (UsbDevice)intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);                    if (intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false)) {                        handler.sendEmptyMessage(1)                                          if(usbDevice != null){                          new MyThread3().start();//MyThread3                       }                    }                     else {                        Log.d("denied", "permission denied for device " + usbDevice);                    }                }            }        }       };   }

当编写完后的运行结果如下图：

打印的信息顺序为下图：

到此主要的程序已经完毕，本程序eclipse的工程代码下载

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