Android研究之監聽自身應用被卸載代碼實現

Android研究之監聽自身應用被卸載代碼實現

1.通過jni實現函數

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//LOG宏定義#define LOG_INFO(tag, msg) __android_log_write(ANDROID_LOG_INFO, tag, msg)#define LOG_DEBUG(tag, msg) __android_log_write(ANDROID_LOG_DEBUG, tag, msg)#define LOG_WARN(tag, msg) __android_log_write(ANDROID_LOG_WARN, tag, msg)#define LOG_ERROR(tag, msg) __android_log_write(ANDROID_LOG_ERROR, tag, msg) /* 內全域變數begin */static charc_TAG[]= "onEvent";staticjboolean b_IS_COPY= JNI_TRUE; jstringJava_com_example_uninstallself_Observer_register(JNIEnv*env, jobject thiz,jstring path,jstring url,jint version){ jstringtag =(*env)->NewStringUTF(env,c_TAG); //初始化log LOG_DEBUG((*env)->GetStringUTFChars(env,tag,&b_IS_COPY), (*env)->GetStringUTFChars(env,(*env)->NewStringUTF(env,"init OK"), &b_IS_COPY)); //fork子進程，以執行輪詢任務 pid_tpid =fork(); if(pid< 0){ //出錯log LOG_ERROR((*env)->GetStringUTFChars(env,tag,&b_IS_COPY), (*env)->GetStringUTFChars(env, (*env)->NewStringUTF(env,"fork failed !!!"), &b_IS_COPY)); }else if(pid== 0){ //子進程註冊目錄監聽器 intfileDescriptor = inotify_init(); if(fileDescriptor< 0){ LOG_DEBUG((*env)->GetStringUTFChars(env,tag,&b_IS_COPY), (*env)->GetStringUTFChars(env, (*env)->NewStringUTF(env, "inotify_init failed !!!"),&b_IS_COPY)); exit(1); } intwatchDescriptor; watchDescriptor= inotify_add_watch(fileDescriptor, (*env)->GetStringUTFChars(env,path,NULL),IN_DELETE); if(watchDescriptor< 0){ LOG_DEBUG((*env)->GetStringUTFChars(env,tag,&b_IS_COPY), (*env)->GetStringUTFChars(env, (*env)->NewStringUTF(env, "inotify_add_watch failed !!!"), &b_IS_COPY)); exit(1); } //分配緩衝，以便讀取event，緩衝大小=一個struct inotify_event的大小，這樣一次處理一個event void*p_buf= malloc(sizeof(structinotify_event)); if(p_buf== NULL){ LOG_DEBUG((*env)->GetStringUTFChars(env,tag,&b_IS_COPY), (*env)->GetStringUTFChars(env, (*env)->NewStringUTF(env,"malloc failed !!!"), &b_IS_COPY)); exit(1); } //開始監聽 LOG_DEBUG((*env)->GetStringUTFChars(env,tag,&b_IS_COPY), (*env)->GetStringUTFChars(env, (*env)->NewStringUTF(env,"start observer"), &b_IS_COPY)); //read會阻塞進程， size_t readBytes= read(fileDescriptor,p_buf, sizeof(structinotify_event)); //走到這裡說明收到目錄被刪除的事件，登出監聽器 free(p_buf); inotify_rm_watch(fileDescriptor,IN_DELETE); //目錄不存在log LOG_DEBUG((*env)->GetStringUTFChars(env,tag,&b_IS_COPY), (*env)->GetStringUTFChars(env, (*env)->NewStringUTF(env,"uninstalled"),&b_IS_COPY)); if(version>= 17){ //4.2以上的系統由於使用者權限管理更嚴格，需要加上 --user 0 execlp("am","am","start","--user","0","-a", "android.intent.action.VIEW","-d", (*env)->GetStringUTFChars(env,url,NULL),(char*)NULL); }else { execlp("am","am","start","-a","android.intent.action.VIEW", "-d",(*env)->GetStringUTFChars(env,url,NULL), (char*)NULL); } //擴充：可以執行其他shell命令，am(即activity manager)，可以開啟某程式、服務，broadcast intent，等等 }else { //父進程直接退出，使子進程被init進程領養，以避免子進程僵死 } return(*env)->NewStringUTF(env,"Hello from JNI !");}

2.定義UninstallObserver

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publicclass UninstallObserver{ static{ System.loadLibrary("observer"); } /*** * * @param path 需要監聽的檔案路徑，可用 getApplicationContext().getFilesDir().getPath() * @param url 卸載調轉http * @param version android.os.Build.VERSION.SDK_INT * @return */ publicstatic nativeString register(Stringpath,String url,int version);}

3.簡單使用

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@Overrideprotected voidonCreate(BundlesavedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Toast.makeText(getApplicationContext(), getApplicationContext().getFilesDir().getPath()+ ","+ Build.VERSION.SDK_INT,1).show(); longa =System.currentTimeMillis(); Stringstr =UninstallObserver.register(getApplicationContext().getFilesDir().getPath(),"http://www.baidu.com", android.os.Build.VERSION.SDK_INT); longb =System.currentTimeMillis(); Toast.makeText(getApplicationContext(),str+","+(b-a),1).show(); }

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