Libusb庫在Android下的使用例程

2019-11-11 05:49:07

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來源：轉載

供稿：網友

轉載請注明：http://blog.csdn.net/hubbybob1/article/details/54863662 閱讀本文前清先了解相關基礎內容，操作步驟請閱讀博客：libusb1.0在android內的移植和使用方法在講解了libusb庫在Android下的移植和基本應用后，下面來講解Libusb的Android工程；

其工程步驟： 1.建立帶有JNI工程的eclipse工程，網上有很多教程 2.根據上一篇博客生成libusb.a庫文件和相關頭文件（libusb.h等）,并導入JNI工程. 3.編寫Android.mk，可以通過ndk-build進行編譯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.編寫C文件并進行ndk-build編譯，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);//啟動libusb jclass class = (*env)->FindClass (env, "com/example/testcusejava/Testcusenative"); jmethodID openUsbDevice = (*env)->GetStaticMethodID(env, class, "openUsbDevice", "(II)I");//GetStaticMethodID GetMethodID，通過jni獲取Java的方法openUsbDevice int fd =(*env)->CallStaticIntMethod(env, class,openUsbDevice ,4703,12587);//CallVoidMethod,CallStaticIntMethod調用openUsbDevice 獲取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);//打開usb設備 if (rc != 0) { __android_log_write(6, "channel-usbredir", "Failed to open USB device."); } //libusb_close(handle); libusb_exit(ctx); //結束libusb}

5.編寫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();// 調用native方法 static { System.loadLibrary("xxtest");//加載ndk-build生成的libxxtest.so庫 } 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();// 調用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; //鏈接到設備的USB設備列表 HashMap<String, UsbDevice> map = usbManager.getDeviceList(); Collection<UsbDevice> usbDevices = map.values(); Iterator<UsbDevice> usbDeviceIter = usbDevices.iterator(); while (usbDeviceIter.hasNext()){ ud = usbDeviceIter.next(); //VendorID 和ProductID 十進制 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 } //檢測USB設備權限受否授權 if(usbManager.haspermission(usbDevice)){ handler.sendEmptyMessage(3); new MyThread3().start(); Log.e("device","usbManager.hasPermission");//bhw }else{ //如果沒有授權就授予權限 handler.sendEmptyMessage(4); usbManager.requestPermission(usbDevice, pendingIntent); //在此Android系統會彈出對話框，選擇是否授予權限 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();//獲取文件描述符 Log.e("device","MyThread3 "+fd); jnicallfunc();//調用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); } } } } }; }

當編寫完后的運行結果如下圖：這里寫圖片描述打印的信息順序為下圖：到此主要的程序已經完畢，本程序eclipse的工程代碼下載