Android研究之监听自身应用被卸载代码实现

1.通过jni实现函数

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//LOG宏定义 #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)   /* 内全局变量begin */ static char c_TAG[] = "onEvent"; static jboolean b_IS_COPY = JNI_TRUE;   jstring Java_com_example_uninstallself_Observer_register(JNIEnv* env,         jobject thiz, jstring path, jstring url, jint version) {     jstring tag = (*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子进程。以运行轮询任务     pid_t pid = fork();     if (pid < 0) {         //出错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) {         //子进程注冊文件夹监听器         int fileDescriptor = 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);         }           int watchDescriptor;           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);         }           //分配缓存。以便读取event。缓存大小=一个struct inotify_event的大小。这样一次处理一个event         void *p_buf = malloc(sizeof(struct inotify_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);         }         //開始监听         LOG_DEBUG((*env)->GetStringUTFChars(env, tag, &b_IS_COPY),                 (*env)->GetStringUTFChars(env,                         (*env)->NewStringUTF(env, "start observer"),                         &b_IS_COPY));         //read会堵塞进程，         size_t readBytes = read(fileDescriptor, p_buf,                 sizeof(struct inotify_event));           //走到这里说明收到文件夹被删除的事件。注销监听器         free(p_buf);         inotify_rm_watch(fileDescriptor, IN_DELETE);           //文件夹不存在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以上的系统因为用户权限管理更严格，须要加上 --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);         }         //扩展：能够运行其它shell命令，am(即activity manager)，能够打开某程序、服务，broadcast intent，等等       } else {         //父进程直接退出，使子进程被init进程领养，以避免子进程僵死     }       return (*env)->NewStringUTF(env, "Hello from JNI !"); }

2.定义UninstallObserver

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public class UninstallObserver {       static{         System.loadLibrary("observer");     }     /***      *      * @param path 须要监听的文件路径。可用 getApplicationContext().getFilesDir().getPath()      * @param url 卸载调转http      * @param version android.os.Build.VERSION.SDK_INT      * @return      */     public static native String register(String path, String url, int version); }

3.简单使用

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@Override protected void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.activity_main);       Toast.makeText(getApplicationContext(),             getApplicationContext().getFilesDir().getPath() + "," + Build.VERSION.SDK_INT, 1).show();     long a = System.currentTimeMillis();     String str = UninstallObserver.register(getApplicationContext().getFilesDir().getPath(), "http://www.baidu.com",             android.os.Build.VERSION.SDK_INT);     long b = System.currentTimeMillis();     Toast.makeText(getApplicationContext(), str+","+(b-a), 1).show();   }

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