1、AndroidJNI媒体文件全盘扫描方案A* Inc. ConfidentialAndroid JNI媒体文件全盘扫描方案变更说明序号版本变更原因变更内容变更人变更日期备注1V0.1初稿初稿叶蕾11/16/20162V0.2初稿初稿叶蕾01/10/20173V0.3初稿初稿叶蕾02/13/2017456789101112131415161718目录1 前言 41.1 文档目的 42 开发环境说明 42.1 扫描入口流程 42.2 ProviderHelp 42.3 JSBD_JL_FileManager 42.4 Launcher图片 53 问题总结 53.1 FileServer框架调整说明
2、 53.1.1 优化Intent事件的监听 5媒体文件扫描方案1 前言该文档为开发人员阅读。1.1 文档目的文档编写目的:为项目参与者阅读。2 开发环境说明说明如下:1) Android系统:Android KK以上版本。2) 开发环境:JDK 1.6以上版本,NDK开发环境。3) 开发工具:Eclipse,Android Develop tools2.1 扫描入口流程大致流程如下: Android Storage Mounted的Intent事件的监听者onReceive:接收Storage挂载的事件。 启动FileService:该服务用来做文件扫描操作,和intent消息外发工作。 Fi
3、leServer会开启ScanRootPathThread线程去做文件的扫描。 在文件扫描的线程中,会去调用ScanJni JNI类中的方法scanRootPath来对某个磁盘进行扫描。 JNI回调函数ScanJNI#insertToDb:用来回调扫描到的媒体数据,并添加到数据库中。本文档主要介绍的是上面步骤中的第4部。也是媒体文件扫描的核心部分。2.2 核心类的说明只介绍该文档中提到的核心类: ScanJni.java类:提供扫描的入口和Java回调的接口 scan_jni.c文件:实现全盘的递归扫描工作 com_file_server_scan_ScanJni.h头文件:编译所需的头文件,
4、用来申明JNI的函数。 Android.mk文件:NDK的编译文件。2.3 核心思路和设计特点核心的思路和设计特点如下:1) 针对文件的后缀名进行扫描,例如*.mp3文件2) 定义了5中文件类型 普通文件:TYPE_FILE 音乐文件:TYPE_AUDIO 视频文件:TYPE_VIDEO 图片文件:TYPE_IMAGE 中间临时文件:TYPE_SWAP3) 针对各个类型的文件进行分别处理。4) JNI C采用递归操作,通过判断文件名的后缀来判断文件类型。5) 递归过程中,提供指定文件夹不扫描的功能。6) 针对特殊文件系统的特殊文件类型的兼容性做过大量的测试工作。保证支持99%的存储介质的全盘扫
5、描。7) 通过Java反射回到机制,将扫描到的媒体文件交给Java上层来处理。3 核心代码3.1 Android.mk文件说明:hz2py.c文件为汉子转拼音的文件,此部分的设计不在这个文档单中。涉及到另外一项技术,请阅读其他文档。3.2 com_file_server_scan_ScanJni.h文件这个部分的代码,不多做解释,只是用来做函数声明。stringFromJni:测试函数。未使用。scanRootPath:扫描的入口getPY:中文转拼音的入口。3.3 ScanJni.java文件3.4 scan_jni.c文件3.4.1 头文件引用#include #include #incl
6、ude #include #include #include #include #include #include #include #include py.h3.4.2 声明和定义#define _LOG_TAG NDK_ScanJNIint TYPE_FILE = 2;int TYPE_AUDIO = 3;int TYPE_VIDEO = 4;int TYPE_IMAGE = 5;int TYPE_SWAP = 6;#define LOGI(.) _android_log_print(ANDROID_LOG_INFO, _LOG_TAG, _VA_ARGS_)#define LOGE(.)
7、 _android_log_print(ANDROID_LOG_ERROR, _LOG_TAG, _VA_ARGS_)jclass mediaBeanClass;jmethodID mediaBeanID;jclass scanJniClass;jmethodID insertToDbID;3.4.3 判断媒体函数int judgeMediaType(char *fileName) char *endStr = fileName; char *tmp; tmp = strrchr(endStr, .); if (tmp != NULL) endStr = tmp + 1; if (strcas
8、ecmp(endStr, mp4) = 0 | strcasecmp(endStr, 3gp) = 0 | strcasecmp(endStr, 3gpp) = 0 | strcasecmp(endStr, 3g2) = 0 | strcasecmp(endStr, 3gpp2) = 0 | strcasecmp(endStr, mpeg) = 0 | strcasecmp(endStr, mkv) = 0 | strcasecmp(endStr, rmvb) = 0 | strcasecmp(endStr, rm) = 0 | strcasecmp(endStr, mov) = 0 | st
9、rcasecmp(endStr, flv) = 0 | strcasecmp(endStr, f4v) = 0 | strcasecmp(endStr, avi) = 0 | strcasecmp(endStr, vob) = 0 | strcasecmp(endStr, ts) = 0 | /*strcasecmp(endStr, asf) = 0 | strcasecmp(endStr, wmv) = 0 |*/ strcasecmp(endStr, m4v) = 0 | strcasecmp(endStr, m2v) = 0 | strcasecmp(endStr, mpe) = 0 |
10、 strcasecmp(endStr, mpg) = 0 | strcasecmp(endStr, ogm) = 0 | strcasecmp(endStr, ram) = 0 | strcasecmp(endStr, divx) = 0 | strcasecmp(endStr, asx) = 0 | strcasecmp(endStr, wm) = 0) return TYPE_VIDEO; else if (strcasecmp(endStr, mp3) = 0 | strcasecmp(endStr, wma) = 0 | strcasecmp(endStr, ape) = 0 | st
11、rcasecmp(endStr, flac) = 0 | strcasecmp(endStr, m4r) = 0 | strcasecmp(endStr, wav) = 0 | strcasecmp(endStr, mp1) = 0 | strcasecmp(endStr, mp2) = 0 | strcasecmp(endStr, aac) = 0 | /*strcasecmp(endStr, ac3) = 0 |*/ strcasecmp(endStr, amr) = 0 | strcasecmp(endStr, m4a) = 0 | strcasecmp(endStr, mid) = 0
12、 | strcasecmp(endStr, midi) = 0 | strcasecmp(endStr, oga) = 0 | strcasecmp(endStr, ra) = 0 | strcasecmp(endStr, mka) = 0 | strcasecmp(endStr, dts) = 0 | strcasecmp(endStr, aiff) = 0 | strcasecmp(endStr, m4a) = 0 | strcasecmp(endStr, mmf) = 0) return TYPE_AUDIO; else if (strcasecmp(endStr, png) = 0 |
13、 strcasecmp(endStr, jpg) = 0 | strcasecmp(endStr, bmp) = 0 | strcasecmp(endStr, jpeg) = 0 | strcasecmp(endStr, gif) = 0 | strcasecmp(endStr, ico) = 0 | strcasecmp(endStr, tag) = 0) return TYPE_IMAGE; else if (strcasecmp(endStr, swap) = 0) return TYPE_SWAP; return TYPE_FILE;3.4.4 处理扫描的结果的函数void addTo
14、Db(JNIEnv* env, jobject thiz, char *filePath, char *fileName, long fileSize) int fileType = judgeMediaType(fileName); char fileNamePY1024; memset(fileNamePY, 0, sizeof(fileNamePY); hztpy(fileName, fileNamePY, 1); char fileNamePYSecond1024; memset(fileNamePYSecond, 0, sizeof(fileNamePYSecond); hztpy(
15、fileName, fileNamePYSecond, 0); strcat(fileNamePY, ;); strcat(fileNamePY, fileNamePYSecond); LOGI(fileName: %s & fileNamePY: %sn, fileName, fileNamePY); if (fileType = TYPE_SWAP) if (remove(filePath) = 0) LOGI(Remove filePath: %sn, filePath); else LOGE(Failed to remove filePath: %sn, filePath); else
16、 if (fileType != TYPE_FILE) jstring filePathString = (*env)-NewStringUTF(env, filePath); jstring fileNameString = (*env)-NewStringUTF(env, fileName); jstring fileNamePYString = (*env)-NewStringUTF(env, fileNamePY); jint jfileType = (int)fileType; jlong jfileSize = (long)fileSize; jobject jniMediaBea
17、n = (*env) - NewObject(env, mediaBeanClass, mediaBeanID, filePathString, fileNameString, fileNamePYString, jfileSize, jfileType); (*env) - CallVoidMethod(env, thiz, insertToDbID, jniMediaBean); (*env) - DeleteLocalRef(env, filePathString); (*env) - DeleteLocalRef(env, fileNameString); (*env) - Delet
18、eLocalRef(env, fileNamePYString); (*env) - DeleteLocalRef(env, jniMediaBean); 3.4.5 递归扫描的函数int readFileList(JNIEnv* env, jobject thiz, const char *basePath) DIR *dir; struct dirent *ptr; if (strcmp(basePath, /mnt/sdcard/MediaCollect) = 0 | strcmp(basePath, /mnt/sdcard/autonavi) = 0 | strcmp(basePath
19、, /mnt/sdcard/amapauto) = 0 | strcmp(basePath, /mnt/sdcard/iflytek) = 0 | strcmp(basePath, /mnt/sdcard/sogou) = 0) return 0; if (dir = opendir(basePath) = NULL) LOGE(Open dir error: %sn, basePath); return -1; while (ptr=readdir(dir) != NULL) if(strcmp(ptr-d_name,.)=0 | strcmp(ptr-d_name,.)=0 | (strc
20、hr(ptr-d_name, .) != NULL & strcmp(ptr-d_name, strchr(ptr-d_name, .) = 0) ) /current dir OR parrent dir continue; else if(ptr-d_type = 8) / file / filePath char filePath1000; memset(filePath, 0, sizeof(filePath); strcpy(filePath, basePath); strcat(filePath, /); strcat(filePath, ptr-d_name); addToDb(
21、env, thiz, filePath, ptr-d_name, 0); else if(ptr-d_type = 10) / link file LOGI(linkName:%s/%sn,basePath,ptr-d_name); else if(ptr-d_type = 4) / dir char dirFilePath1000; memset(dirFilePath, 0, sizeof(dirFilePath); strcpy(dirFilePath, basePath); strcat(dirFilePath, /); strcat(dirFilePath, ptr-d_name);
22、 readFileList(env, thiz, dirFilePath); else if(ptr-d_type = 0) /unknown char fileWhole1000; memset(fileWhole, 0, sizeof(fileWhole); strcpy(fileWhole, basePath); strcat(fileWhole, /); strcat(fileWhole, ptr-d_name); struct stat statbuf; if(stat(fileWhole, &statbuf) = -1) /unknow error LOGI(unknowFile:
23、%s/%sn,basePath,ptr-d_name); continue; if(S_ISREG(statbuf.st_mode) / file addToDb(env, thiz, fileWhole, ptr-d_name, 0); else if(S_ISDIR(statbuf.st_mode)/ dir readFileList(env, thiz, fileWhole); else LOGE(Other d_type:%d - linkName:%s/%sn,ptr-d_type, basePath,ptr-d_name); closedir(dir); return 1;3.4.
24、6 stringFromJni函数jstring Java_com_file_server_ScanJni_stringFromJni (JNIEnv* env, jobject thiz) return (*env)-NewStringUTF(env, Hello from scanjni.so !);3.4.7 扫描入口函数scanRootPathvoid Java_com_file_server_scan_ScanJni_scanRootPath (JNIEnv* env, jobject thiz, jstring rootPath) mediaBeanClass = (*env) -
25、 FindClass(env, com/jsbd/file/provider/bean/MediaBean); mediaBeanID = (*env) - GetMethodID(env, mediaBeanClass, , (Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;JI)V); scanJniClass = (*env) - FindClass(env, com/file/server/scan/ScanJni); insertToDbID = (*env) - GetMethodID(env, scanJniClass,
26、 insertToDb, (Lcom/jsbd/file/provider/bean/MediaBean;)V); const char *basePath = (*env)-GetStringUTFChars(env, rootPath, 0); readFileList(env, thiz, basePath); (*env)-ReleaseStringUTFChars(env, rootPath, basePath);3.4.8 获取汉子拼音的函数getPYjstring Java_com_file_server_scan_ScanJni_getPY (JNIEnv* env, jobj
27、ect thiz, jstring jfileName) const char *filename = (*env)-GetStringUTFChars(env, jfileName, 0); char fileNamePY1024; memset(fileNamePY, 0, sizeof(fileNamePY); hztpy(filename, fileNamePY, 1); char fileNamePYSecond1024; memset(fileNamePYSecond, 0, sizeof(fileNamePYSecond); hztpy(filename, fileNamePYSecond, 0); strcat(fileNamePY, ;); strcat(fileNamePY, fileNamePYSecond); (*env)-ReleaseStringUTFChars(env, jfileName, filename); return (*env)-NewStringUTF(env, fileNamePY);