ANDROID应用如何监听自己是否被卸载及卸载反馈功能的实现

来源:互联网 发布:c语言中%u是什么意思 编辑:程序博客网 时间:2024/05/01 10:45

一个应用被用户卸载肯定是有理由的,而开发者却未必能得知这一重要的理由,毕竟用户很少会主动反馈建议,多半就是用得不爽就卸,如果能在被卸载后获取到用户的一些反馈,那对开发者进一步改进应用是非常有利的。目前据我所知,国内的Android应用中实现这一功能的只有360手机卫士、360平板卫士,那么如何实现这一功能的?

  我们可以把实现卸载反馈的问题转化为监听自己是否被卸载,只有得知自己被卸载,才可以设计相应的反馈处理流程。以下的列表是我在研究这一问题的思路:

  1,注册BroadcastReceiver,监听"android.intent.action.PACKAGE_REMOVED"系统广播

  结果:NO。未写代码,直接分析,卸载的第一步就是退出当前应用的主进程,而此广播是在已经卸载完成后才发出的,此时主进程都没有了,去哪onReceive()呢?

  2,若能收到"将要卸载XX包"的系统广播,在主进程被退出之前就抢先进行反馈处理就好了,可惜没有这样的系统广播,不过经过调研,倒是发现了一个办法,读取系统log,当日志中包含"android.intent.action.DELETE"和自己的包名时,意味着自己将要被卸载。

  结果:NO。调试时发现此方法有两个缺陷,(1)点击设置中的卸载按钮即发出此Intent,此时用户尚未在弹框中确认卸载;(2)pm命令卸载不出发此Intent,意味着被诸如手机安全管家,豌豆荚等软件卸载时,无法提前得知卸载意图。

  3,由于时间点不容易把控,所以干脆不依赖系统广播或log,考虑到卸载过程会删除"/data/data/包名"目录,我们可以用线程直接轮询这个目录是否存在,以此为依据判断自己是否被卸载。

  结果:NO。同方法1,主进程退出,相应的线程必定退出,线程还没等到判断目录是否存在就已经被销毁了。

  4,改用C端进程轮询"/data/data/包名"目录是否存在

  结果:YES。借助Java端进程fork出来的C端进程在应用被卸载后不会被销毁。

  OK,上代码!

Activity启动时fork出C端进程轮询目录:

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 1 package main.activity; 2  3 import pym.test.uninstalledmoniter.R; 4 import android.app.Activity; 5 import android.os.Bundle; 6 import android.util.Log; 7  8 /** 9  * @author pengyiming10  * @note 监听此应用是否被卸载,若被卸载则弹出卸载反馈11  *12  */13 14 public class UninstalledMoniterActivity extends Activity15 {16     /* 数据段begin */17     private static final String TAG = "UninstalledMoniterActivity";18     /* 数据段end */19     20     /* 函数段begin */21     private native void init();22     static23     {24         Log.d(TAG, "load libuninstalled_moniter");25         System.loadLibrary("uninstalled_moniter");26     }27     28     @Override29     public void onCreate(Bundle savedInstanceState)30     {31         super.onCreate(savedInstanceState);32         Log.d(TAG, "onCreate");33         34         setContentView(R.layout.uninstalled_moniter_layout);35         36         init();37     }38     /* 函数段end */39 }
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核心——native方法头文件:

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 1 /* 头文件begin */ 2 #include <jni.h> 3 #include <stdio.h> 4 #include <string.h> 5 #include <android/log.h> 6 #include <unistd.h> 7 /* 头文件end */ 8  9 /* 宏定义begin */10 //清0宏11 #define MEM_ZERO(pDest, destSize) memset(pDest, 0, destSize)12 13 //LOG宏定义14 #define LOG_INFO(tag, msg) __android_log_write(ANDROID_LOG_INFO, tag, msg)15 #define LOG_DEBUG(tag, msg) __android_log_write(ANDROID_LOG_DEBUG, tag, msg)16 #define LOG_WARN(tag, msg) __android_log_write(ANDROID_LOG_WARN, tag, msg)17 #define LOG_ERROR(tag, msg) __android_log_write(ANDROID_LOG_ERROR, tag, msg)18 /* 宏定义end */19 20 #ifndef _Included_main_activity_UninstalledMoniterActivity21 #define _Included_main_activity_UninstalledMoniterActivity22 #ifdef __cplusplus23 extern "C" {24 #endif25 26 #undef main_activity_UninstalledMoniterActivity_MODE_PRIVATE27 #define main_activity_UninstalledMoniterActivity_MODE_PRIVATE 0L28 #undef main_activity_UninstalledMoniterActivity_MODE_WORLD_READABLE29 #define main_activity_UninstalledMoniterActivity_MODE_WORLD_READABLE 1L30 #undef main_activity_UninstalledMoniterActivity_MODE_WORLD_WRITEABLE31 #define main_activity_UninstalledMoniterActivity_MODE_WORLD_WRITEABLE 2L32 #undef main_activity_UninstalledMoniterActivity_MODE_APPEND33 #define main_activity_UninstalledMoniterActivity_MODE_APPEND 32768L34 #undef main_activity_UninstalledMoniterActivity_MODE_MULTI_PROCESS35 #define main_activity_UninstalledMoniterActivity_MODE_MULTI_PROCESS 4L36 #undef main_activity_UninstalledMoniterActivity_BIND_AUTO_CREATE37 #define main_activity_UninstalledMoniterActivity_BIND_AUTO_CREATE 1L38 #undef main_activity_UninstalledMoniterActivity_BIND_DEBUG_UNBIND39 #define main_activity_UninstalledMoniterActivity_BIND_DEBUG_UNBIND 2L40 #undef main_activity_UninstalledMoniterActivity_BIND_NOT_FOREGROUND41 #define main_activity_UninstalledMoniterActivity_BIND_NOT_FOREGROUND 4L42 #undef main_activity_UninstalledMoniterActivity_BIND_ABOVE_CLIENT43 #define main_activity_UninstalledMoniterActivity_BIND_ABOVE_CLIENT 8L44 #undef main_activity_UninstalledMoniterActivity_BIND_ALLOW_OOM_MANAGEMENT45 #define main_activity_UninstalledMoniterActivity_BIND_ALLOW_OOM_MANAGEMENT 16L46 #undef main_activity_UninstalledMoniterActivity_BIND_WAIVE_PRIORITY47 #define main_activity_UninstalledMoniterActivity_BIND_WAIVE_PRIORITY 32L48 #undef main_activity_UninstalledMoniterActivity_BIND_IMPORTANT49 #define main_activity_UninstalledMoniterActivity_BIND_IMPORTANT 64L50 #undef main_activity_UninstalledMoniterActivity_BIND_ADJUST_WITH_ACTIVITY51 #define main_activity_UninstalledMoniterActivity_BIND_ADJUST_WITH_ACTIVITY 128L52 #undef main_activity_UninstalledMoniterActivity_CONTEXT_INCLUDE_CODE53 #define main_activity_UninstalledMoniterActivity_CONTEXT_INCLUDE_CODE 1L54 #undef main_activity_UninstalledMoniterActivity_CONTEXT_IGNORE_SECURITY55 #define main_activity_UninstalledMoniterActivity_CONTEXT_IGNORE_SECURITY 2L56 #undef main_activity_UninstalledMoniterActivity_CONTEXT_RESTRICTED57 #define main_activity_UninstalledMoniterActivity_CONTEXT_RESTRICTED 4L58 #undef main_activity_UninstalledMoniterActivity_RESULT_CANCELED59 #define main_activity_UninstalledMoniterActivity_RESULT_CANCELED 0L60 #undef main_activity_UninstalledMoniterActivity_RESULT_OK61 #define main_activity_UninstalledMoniterActivity_RESULT_OK -1L62 #undef main_activity_UninstalledMoniterActivity_RESULT_FIRST_USER63 #define main_activity_UninstalledMoniterActivity_RESULT_FIRST_USER 1L64 #undef main_activity_UninstalledMoniterActivity_DEFAULT_KEYS_DISABLE65 #define main_activity_UninstalledMoniterActivity_DEFAULT_KEYS_DISABLE 0L66 #undef main_activity_UninstalledMoniterActivity_DEFAULT_KEYS_DIALER67 #define main_activity_UninstalledMoniterActivity_DEFAULT_KEYS_DIALER 1L68 #undef main_activity_UninstalledMoniterActivity_DEFAULT_KEYS_SHORTCUT69 #define main_activity_UninstalledMoniterActivity_DEFAULT_KEYS_SHORTCUT 2L70 #undef main_activity_UninstalledMoniterActivity_DEFAULT_KEYS_SEARCH_LOCAL71 #define main_activity_UninstalledMoniterActivity_DEFAULT_KEYS_SEARCH_LOCAL 3L72 #undef main_activity_UninstalledMoniterActivity_DEFAULT_KEYS_SEARCH_GLOBAL73 #define main_activity_UninstalledMoniterActivity_DEFAULT_KEYS_SEARCH_GLOBAL 4L74 75 /*76  * Class:     main_activity_UninstalledMoniterActivity77  * Method:    init78  * Signature: ()V79  */80 JNIEXPORT void JNICALL Java_main_activity_UninstalledMoniterActivity_init(JNIEnv *, jobject);81 82 #ifdef __cplusplus83 }84 #endif85 #endif
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核心——native方法实现:

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 1 /* 头文件begin */ 2 #include "main_activity_UninstalledMoniterActivity.h" 3 /* 头文件end */ 4  5 #ifdef __cplusplus 6 extern "C" { 7 #endif 8  9 /* 内全局变量begin */10 static char c_TAG[] = "UninstalledMoniterActivity.init";11 static jboolean b_IS_COPY = JNI_TRUE;12 /* 内全局变量 */13 14 /*15  * Class:     main_activity_UninstalledMoniterActivity16  * Method:    init17  * Signature: ()V18  */19 JNIEXPORT void JNICALL Java_main_activity_UninstalledMoniterActivity_init(JNIEnv *env, jobject obj)20 {21     jstring tag = (*env)->NewStringUTF(env, c_TAG);22 23     //初始化log24     LOG_DEBUG((*env)->GetStringUTFChars(env, tag, &b_IS_COPY)25             , (*env)->GetStringUTFChars(env, (*env)->NewStringUTF(env, "init OK"), &b_IS_COPY));26 27     //fork子进程,以执行轮询任务28     pid_t pid = fork();29     if (pid < 0)30     {31         //出错log32         LOG_ERROR((*env)->GetStringUTFChars(env, tag, &b_IS_COPY)33                 , (*env)->GetStringUTFChars(env, (*env)->NewStringUTF(env, "fork error !!!"), &b_IS_COPY));34     }35     else if (pid == 0)36     {37         //子进程轮询"/data/data/pym.test.uninstalledmoniter"目录是否存在,若不存在则说明已被卸载38         while (1)39         {40             FILE *p_file = fopen("/data/data/pym.test.uninstalledmoniter", "r");41             if (p_file != NULL)42             {43                 fclose(p_file);44 45                 //目录存在log46                 LOG_DEBUG((*env)->GetStringUTFChars(env, tag, &b_IS_COPY)47                             , (*env)->GetStringUTFChars(env, (*env)->NewStringUTF(env, "I'm OK !!!"), &b_IS_COPY));48 49                 sleep(1);50             }51             else52             {53                 //目录不存在log54                 LOG_DEBUG((*env)->GetStringUTFChars(env, tag, &b_IS_COPY)55                             , (*env)->GetStringUTFChars(env, (*env)->NewStringUTF(env, "I'm NOT OK !!!"), &b_IS_COPY));56 57                 //执行命令am start -a android.intent.action.VIEW -d http://shouji.360.cn/web/uninstall/uninstall.html58                 execlp("am", "am", "start", "-a", "android.intent.action.VIEW", "-d", "http://shouji.360.cn/web/uninstall/uninstall.html", (char *)NULL);59             }60         }61     }62     else63     {64         //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65     }66 }67 68 #ifdef __cplusplus69 }70 #endif
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注1:为了调试方便,包含<android/log.h>,使得so在执行过程中也可以像Java端一样方便得打出log。相应的mk文件需要加上以下两句声明

LOCAL_C_INCLUDES := $(LOCAL_PATH)/include
LOCAL_LDLIBS += -L$(SYSROOT)/usr/lib -llog

注2:代码中引用了360手机卫士的反馈地址,仅供大家学习、测试使用~~~

 

 

技术方案有一个硬伤,就是每1s就需要轮询目录是否存在,对资源消耗较大,第二版将会解决这一问题。思路是今天想到了一个Android自API1就有的一个类FileObserver,这个类用于监听某个文件的变化状态,如果是目录,这个类还可以监听其子目录及子目录文件的变化状态,通过阅读FileObserver源码,发现其实现利用了Linux内核中一个重要的机制inotify,它是一个内核用于通知用户空间程序文件系统变化的机制,详情可参考http://en.wikipedia.org/wiki/Inotify,里面对inotify有比较详细的说明。

  使用inotify的好处就在于不需要每1s的轮询,这样就不会无谓地消耗系统资源,使用inotify时会用read()方法阻塞进程,直到收到IN_DELETE通知,此时进程重新被唤醒,执行反馈处理流程。

  由于Activity代码和Android.mk文件和第一版并无实质性区别,这里就不贴代码了,直接贴出C端进程的实现代码吧。

核心——native方法头文件:

 

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 1 /* 头文件begin */ 2 #include <jni.h> 3 #include <stdlib.h> 4 #include <stdio.h> 5 #include <string.h> 6 #include <android/log.h> 7 #include <unistd.h> 8 #include <sys/inotify.h> 9 #include <fcntl.h>10 /* 头文件end */11 12 /* 宏定义begin */13 //清0宏14 #define MEM_ZERO(pDest, destSize) memset(pDest, 0, destSize)15 16 //LOG宏定义17 #define LOG_INFO(tag, msg) __android_log_write(ANDROID_LOG_INFO, tag, msg)18 #define LOG_DEBUG(tag, msg) __android_log_write(ANDROID_LOG_DEBUG, tag, msg)19 #define LOG_WARN(tag, msg) __android_log_write(ANDROID_LOG_WARN, tag, msg)20 #define LOG_ERROR(tag, msg) __android_log_write(ANDROID_LOG_ERROR, tag, msg)21 /* 宏定义end */22 23 #ifndef _Included_main_activity_UninstalledObserverActivity24 #define _Included_main_activity_UninstalledObserverActivity25 #ifdef __cplusplus26 extern "C" {27 #endif28 29 #undef main_activity_UninstalledObserverActivity_MODE_PRIVATE30 #define main_activity_UninstalledObserverActivity_MODE_PRIVATE 0L31 #undef main_activity_UninstalledObserverActivity_MODE_WORLD_READABLE32 #define main_activity_UninstalledObserverActivity_MODE_WORLD_READABLE 1L33 #undef main_activity_UninstalledObserverActivity_MODE_WORLD_WRITEABLE34 #define main_activity_UninstalledObserverActivity_MODE_WORLD_WRITEABLE 2L35 #undef main_activity_UninstalledObserverActivity_MODE_APPEND36 #define main_activity_UninstalledObserverActivity_MODE_APPEND 32768L37 #undef main_activity_UninstalledObserverActivity_MODE_MULTI_PROCESS38 #define main_activity_UninstalledObserverActivity_MODE_MULTI_PROCESS 4L39 #undef main_activity_UninstalledObserverActivity_BIND_AUTO_CREATE40 #define main_activity_UninstalledObserverActivity_BIND_AUTO_CREATE 1L41 #undef main_activity_UninstalledObserverActivity_BIND_DEBUG_UNBIND42 #define main_activity_UninstalledObserverActivity_BIND_DEBUG_UNBIND 2L43 #undef main_activity_UninstalledObserverActivity_BIND_NOT_FOREGROUND44 #define main_activity_UninstalledObserverActivity_BIND_NOT_FOREGROUND 4L45 #undef main_activity_UninstalledObserverActivity_BIND_ABOVE_CLIENT46 #define main_activity_UninstalledObserverActivity_BIND_ABOVE_CLIENT 8L47 #undef main_activity_UninstalledObserverActivity_BIND_ALLOW_OOM_MANAGEMENT48 #define main_activity_UninstalledObserverActivity_BIND_ALLOW_OOM_MANAGEMENT 16L49 #undef main_activity_UninstalledObserverActivity_BIND_WAIVE_PRIORITY50 #define main_activity_UninstalledObserverActivity_BIND_WAIVE_PRIORITY 32L51 #undef main_activity_UninstalledObserverActivity_BIND_IMPORTANT52 #define main_activity_UninstalledObserverActivity_BIND_IMPORTANT 64L53 #undef main_activity_UninstalledObserverActivity_BIND_ADJUST_WITH_ACTIVITY54 #define main_activity_UninstalledObserverActivity_BIND_ADJUST_WITH_ACTIVITY 128L55 #undef main_activity_UninstalledObserverActivity_CONTEXT_INCLUDE_CODE56 #define main_activity_UninstalledObserverActivity_CONTEXT_INCLUDE_CODE 1L57 #undef main_activity_UninstalledObserverActivity_CONTEXT_IGNORE_SECURITY58 #define main_activity_UninstalledObserverActivity_CONTEXT_IGNORE_SECURITY 2L59 #undef main_activity_UninstalledObserverActivity_CONTEXT_RESTRICTED60 #define main_activity_UninstalledObserverActivity_CONTEXT_RESTRICTED 4L61 #undef main_activity_UninstalledObserverActivity_RESULT_CANCELED62 #define main_activity_UninstalledObserverActivity_RESULT_CANCELED 0L63 #undef main_activity_UninstalledObserverActivity_RESULT_OK64 #define main_activity_UninstalledObserverActivity_RESULT_OK -1L65 #undef main_activity_UninstalledObserverActivity_RESULT_FIRST_USER66 #define main_activity_UninstalledObserverActivity_RESULT_FIRST_USER 1L67 #undef main_activity_UninstalledObserverActivity_DEFAULT_KEYS_DISABLE68 #define main_activity_UninstalledObserverActivity_DEFAULT_KEYS_DISABLE 0L69 #undef main_activity_UninstalledObserverActivity_DEFAULT_KEYS_DIALER70 #define main_activity_UninstalledObserverActivity_DEFAULT_KEYS_DIALER 1L71 #undef main_activity_UninstalledObserverActivity_DEFAULT_KEYS_SHORTCUT72 #define main_activity_UninstalledObserverActivity_DEFAULT_KEYS_SHORTCUT 2L73 #undef main_activity_UninstalledObserverActivity_DEFAULT_KEYS_SEARCH_LOCAL74 #define main_activity_UninstalledObserverActivity_DEFAULT_KEYS_SEARCH_LOCAL 3L75 #undef main_activity_UninstalledObserverActivity_DEFAULT_KEYS_SEARCH_GLOBAL76 #define main_activity_UninstalledObserverActivity_DEFAULT_KEYS_SEARCH_GLOBAL 4L77 78 /*79  * Class:     main_activity_UninstalledObserverActivity80  * Method:    init81  * Signature: ()V82  */83 JNIEXPORT void JNICALL Java_main_activity_UninstalledObserverActivity_init(JNIEnv *, jobject);84 85 #ifdef __cplusplus86 }87 #endif88 #endif
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核心——native方法实现:

 

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 1 /* 头文件begin */ 2 #include "main_activity_UninstalledObserverActivity.h" 3 /* 头文件end */ 4  5 #ifdef __cplusplus 6 extern "C" { 7 #endif 8  9 /* 内全局变量begin */10 static char c_TAG[] = "UninstalledObserverActivity.init";11 static jboolean b_IS_COPY = JNI_TRUE;12 /* 内全局变量 */13 14 /*15  * Class:     main_activity_UninstalledObserverActivity16  * Method:    init17  * Signature: ()V18  */19 JNIEXPORT void JNICALL Java_main_activity_UninstalledObserverActivity_init(JNIEnv *env, jobject obj)20 {21     jstring tag = (*env)->NewStringUTF(env, c_TAG);22 23     //初始化log24     LOG_DEBUG((*env)->GetStringUTFChars(env, tag, &b_IS_COPY)25             , (*env)->GetStringUTFChars(env, (*env)->NewStringUTF(env, "init OK"), &b_IS_COPY));26 27     //fork子进程,以执行轮询任务28     pid_t pid = fork();29     if (pid < 0)30     {31         //出错log32         LOG_ERROR((*env)->GetStringUTFChars(env, tag, &b_IS_COPY)33                 , (*env)->GetStringUTFChars(env, (*env)->NewStringUTF(env, "fork failed !!!"), &b_IS_COPY));34     }35     else if (pid == 0)36     {37         //子进程注册"/data/data/pym.test.uninstalledobserver"目录监听器38         int fileDescriptor = inotify_init();39         if (fileDescriptor < 0)40         {41             LOG_DEBUG((*env)->GetStringUTFChars(env, tag, &b_IS_COPY)42                     , (*env)->GetStringUTFChars(env, (*env)->NewStringUTF(env, "inotify_init failed !!!"), &b_IS_COPY));43 44              exit(1);45         }46 47         int watchDescriptor;48         watchDescriptor = inotify_add_watch(fileDescriptor, "/data/data/pym.test.uninstalledobserver", IN_DELETE);49         if (watchDescriptor < 0)50         {51             LOG_DEBUG((*env)->GetStringUTFChars(env, tag, &b_IS_COPY)52                     , (*env)->GetStringUTFChars(env, (*env)->NewStringUTF(env, "inotify_add_watch failed !!!"), &b_IS_COPY));53 54             exit(1);55         }56 57         //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event58         void *p_buf = malloc(sizeof(struct inotify_event));59         if (p_buf == NULL)60         {61             LOG_DEBUG((*env)->GetStringUTFChars(env, tag, &b_IS_COPY)62                     , (*env)->GetStringUTFChars(env, (*env)->NewStringUTF(env, "malloc failed !!!"), &b_IS_COPY));63 64             exit(1);65         }66         //开始监听67         LOG_DEBUG((*env)->GetStringUTFChars(env, tag, &b_IS_COPY)68                     , (*env)->GetStringUTFChars(env, (*env)->NewStringUTF(env, "start observer"), &b_IS_COPY));69         size_t readBytes = read(fileDescriptor, p_buf, sizeof(struct inotify_event));70 71         //read会阻塞进程,走到这里说明收到目录被删除的事件,注销监听器72         free(p_buf);73         inotify_rm_watch(fileDescriptor, IN_DELETE);74 75         //目录不存在log76         LOG_DEBUG((*env)->GetStringUTFChars(env, tag, &b_IS_COPY)77                     , (*env)->GetStringUTFChars(env, (*env)->NewStringUTF(env, "uninstalled"), &b_IS_COPY));78 79         //执行命令am start -a android.intent.action.VIEW -d http://shouji.360.cn/web/uninstall/uninstall.html80         execlp("am", "am", "start", "-a", "android.intent.action.VIEW", "-d", "http://shouji.360.cn/web/uninstall/uninstall.html", (char *)NULL);81     }82     else83     {84         //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85     }86 }87 88 #ifdef __cplusplus89 }90 #endif
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http://www.cnblogs.com/zealotrouge/p/3157126.html

http://www.cnblogs.com/zealotrouge/p/3159772.html

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