Android_監聽自身應用被卸載

標籤：jni   android   uninstall   

1.通過jni實現函數

//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 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logLOG_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_t pid = fork();if (pid < 0) {//出錯logLOG_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eventvoid *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(struct inotify_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logLOG_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 0execlp("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

public class 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 */public static native String register(String path, String url, int version);}

3.簡單使用

@Overrideprotected 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();}

Android_監聽自身應用被卸載