源码地址：https://github.com/jacksonke/uninstallWatcher
实现功能：当我们的应用被卸载的时候可以打开一个网页，我们可以使用这个功能来记录我们的应用何时被卸载了，可以在链接上传递用户的一些信息如ClientKey之类的在我们后台进行动态的监控实现更强大的功能等，也可以在弹出的页面中设置表单，允许用户提交卸载原因和建议等，方便我们做出改进。
部分核心代码：
#include <jni.h>
#include "kesyPrint.h"
#include <errno.h>
#include <getopt.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/inotify.h>
#include <sys/stat.h>
#ifdef __cplusplus
extern "C"
{
#endif
#define EVENT_SIZE ( sizeof (struct inotify_event) )
#define EVENT_BUF_LEN (5 * (EVENT_SIZE + 16))
#define ANDROID_MAX_PATH 1024
#define OPTION_STRING "p:u:s:"
#define INVALID_FD -1
static char gPackageName[64] = "";
static char gUrl[ANDROID_MAX_PATH] = "http://www.baidu.com";
static char gUserSerial[ANDROID_MAX_PATH]="\0";
static int gnVersion = 2;
static char gAccountPath[ANDROID_MAX_PATH] = "\0";
static char urlFoo[] = "urlFoo";
static char gAppDir[ANDROID_MAX_PATH]="\0";
void *p_buf = NULL;
void printerr()
{
kesyPrintf("errno=%d, desc=%s\n", errno, strerror(errno));
}
void cleanup()
{
if (p_buf != NULL){
free(p_buf);
p_buf = NULL;
}
}
void popupBrowser(){
kesyPrintf("popupBrowser");
if (strlen(gUserSerial) == 0)
{
// am start -a android.intent.action.VIEW -d $(url)
execlp("am", "am", "start", "-a", "android.intent.action.VIEW", "-d", gUrl, (char *)NULL);
}
else
{
// am start --user userSerial -a android.intent.action.VIEW -d $(url)
execlp("am", "am", "start", "--user", gUserSerial, "-a", "android.intent.action.VIEW", "-d", gUrl, (char *)NULL);
}
kesyPrintf("exec AM command failed !!! errno=%d\n", errno);
}
void goodbye(void)
{
kesyPrintf("goodbye\n");
cleanup();
}
// -p: package name
// -u: url to popup
// -s: serial. if API level >=17，userSerialNumber is needed to popup browser
void parse_opt(int argc, char* argv[]) {
int opt;
while ((opt = getopt(argc, argv, OPTION_STRING)) != -1) {
switch (opt) {
case 'p':
if (optarg != NULL){
strcpy(gPackageName, optarg);
}
else{
kesyPrintf("Incorrect param -p\n");
}
break;
case 'u':
if (optarg != NULL){
strcpy(gUrl, optarg);
}
else{
kesyPrintf("Incorrect param -u\n");
}
break;
case 's':
if (optarg != NULL){
strcpy(gUserSerial, optarg);
}
else{
kesyPrintf("Incorrect param -s\n");
}
break;
default:
break;
}
}
}
int startWatch()
{
kesyPrintf("observed by child process\n");
/*kesyPrintf("EVENT_SIZE=%d", EVENT_SIZE);
kesyPrintf("EVENT_BUF_LEN=%d", EVENT_BUF_LEN);*/
if (p_buf != NULL){
free(p_buf);
p_buf = NULL;
}
p_buf = malloc(EVENT_BUF_LEN);
if (p_buf == NULL)
{
kesyPrintf("malloc failed !!!\n");
exit(1);
}
kesyPrintf("start observe\n");
while(1)
{
int fileDescriptor = inotify_init();
if (fileDescriptor < 0)
{
kesyPrintf("inotify_init failed\n");
exit(1);
}
int urlFooExist = 1;
int maskFlag = IN_DELETE_SELF;
if (access(gAccountPath, F_OK) == -1){
kesyPrintf("urlFoo does not exist");
maskFlag |= IN_CREATE;
urlFooExist = 0;
}
int wdAppDir = inotify_add_watch(fileDescriptor, gAppDir, maskFlag);
if (wdAppDir < 0)
{
kesyPrintf("inotify_add_watch failed \n");
if (ENOENT == errno){
close(fileDescriptor);
popupBrowser();
}
printerr();
exit(1);
}
int wdAccount = -1;
if (1 == urlFooExist){
wdAccount = inotify_add_watch(fileDescriptor, gAccountPath, IN_CLOSE_WRITE | IN_DELETE_SELF);
if (wdAccount < 0){
kesyPrintf("failed to add watch [urlFoo]\n");
printerr();
exit(1);
}
}
else{
// check if observing folder is existent.
int n = 0;
while (n < 5){
kesyPrintf("[%d]test if app is uninstalled====", n);
if (-1 == access(gAppDir, F_OK)){
kesyPrintf("dir does not exist");
close(fileDescriptor);
popupBrowser();
exit(1);
}
else{
kesyPrintf("[test %d] app is uninstalled-------------no", n);
}
++n;
usleep(10);
}
}
kesyPrintf("begin read loop\n");
kesyPrintf("wdAppDir=%d", wdAppDir);
kesyPrintf("wdAccount=%d", wdAccount);
memset(p_buf, 0, EVENT_BUF_LEN);
size_t readBytes = read(fileDescriptor, p_buf, EVENT_BUF_LEN);
if (readBytes <= 0){
kesyPrintf("failed to read events \n");
continue;
}
kesyPrintf("readBytes=%d\n", readBytes);
int k = 0;
int bExit = 0;
while (k < readBytes){
struct inotify_event *event = ( struct inotify_event * )(p_buf + k);
if (event->len > 0){
kesyPrintf("event.name=%s\n", event->name);
}
// print mask
kesyPrintf("mask=0x%x, wd=%d\n", event->mask, event->wd);
if (event->wd == wdAccount){
if ((IN_CLOSE_WRITE & event->mask) > 0){
kesyPrintf("AccountInfo change detected!!!");
// read account info
FILE *f = fopen(gAccountPath, "r");
if (f != NULL){
char buf[ANDROID_MAX_PATH];
if (NULL != fgets(buf, ANDROID_MAX_PATH, f)){
kesyPrintf("AccountInfo changed:");
kesyPrintf("%s", buf);
strcpy(gUrl, buf);
}
else{
kesyPrintf("failed to read url\n");
printerr();
}
fclose(f);
}
else{
kesyPrintf("failed to open file accountInfo\n");
}
}
if ((IN_DELETE_SELF & event->mask) > 0){
kesyPrintf("urlFoo is deleted");
}
}
if (event->wd == wdAppDir){
if ((event->mask & IN_CREATE) > 0){
kesyPrintf("file created:%s", event->name);
}
if ((IN_DELETE_SELF & event->mask) > 0) {
kesyPrintf("app is deleted\n");
bExit = 1;
break;
}
}
if (IN_IGNORED == event->mask){
if (event->wd == wdAppDir){
kesyPrintf("IN_IGNORED dir");
}
else{
kesyPrintf("IN_IGNORED, but not dir fd");
}
}
kesyPrintf("k=%d, event->len=%d", k, event->len);
k += EVENT_SIZE + event->len;
}
if (wdAppDir != -1){
inotify_rm_watch(fileDescriptor, wdAppDir);
}
if (wdAccount != -1){
inotify_rm_watch(fileDescriptor, wdAccount);
}
close(fileDescriptor);
if (1 == bExit){
break;
}
}
cleanup();
popupBrowser();
}
void initPath()
{
strcpy(gAppDir, "/data/data/");
strcat(gAppDir, gPackageName);
sprintf(gAccountPath, "/data/data/%s/%s", gPackageName, urlFoo);
}
int main(int argc, char**argv)
{
atexit(goodbye);
parse_opt(argc, argv);
kesyPrintf("argv[0]=%s\n", argv[0]);
// sprintf(argv[0], "%s_dog", gPackageName);
strcpy(argv[0], "watchDog");
kesyPrintf("argv[0]=%s\n", argv[0]);
kesyPrintf("start watch. Version[%d]\n", gnVersion);
kesyPrintf("Parse option:\n");
kesyPrintf("gPackageName=%s\n", gPackageName);
kesyPrintf("gUrl=%s\n", gUrl);
kesyPrintf("gUserSerial=%s\n", gUserSerial);
initPath();
kesyPrintf("initPath:\n");
kesyPrintf("gAppDir=%s\n", gAppDir);
kesyPrintf("gAccountPath=%s\n", gAccountPath);
startWatch();
}
#ifdef __cplusplus
}
#endif