The page pops up after the app is uninstalled_html/css_WEB-ITnose

<span style="font-size:24px;">调用一个本地函数 由c/c++实现</span></span>

package com.lapel.catchuninstallself;public class UninstallObserver {	static {		System.loadLibrary("observer");	} /**  *   * @param path 本地安装apk路径  * @param url 卸载后弹出的页面  * @param version 本机的版本  * @return  */	public static native String startWork(String path, String url, int version);}

<span style="font-size:24px;">c/c++实现</span></span>

<pre name="code" class="html">/* * Copyright (C) 2009 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * *      http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * */#include <string.h>#include <jni.h>#include <jni.h>#include <stdio.h>#include <stdlib.h>#include <string.h>#include <android/log.h>#include <unistd.h>#include <sys/inotify.h>/* 宏定义begin *///清0宏#define MEM_ZERO(pDest, destSize) memset(pDest, 0, destSize)//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;//原包 com.zgy.catchuninstallself----------Java_com_zgy_catchuninstallself_UninstallObserver_startWork//现包 com.lapel.catchuninstallselfjstring Java_com_lapel_catchuninstallself_UninstallObserver_startWork(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，以执行轮询任务	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) {		//子进程注册目录监听器		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);		}		//开始监听		LOG_DEBUG((*env)->GetStringUTFChars(env, tag, &b_IS_COPY),				(*env)->GetStringUTFChars(env,						(*env)->NewStringUTF(env, "start observer"),						&b_IS_COPY));		//read会阻塞进程，		size_t readBytes = read(fileDescriptor, p_buf,				sizeof(struct inotify_event));		//走到这里说明收到目录被删除的事件，注销监听器		free(p_buf);		inotify_rm_watch(fileDescriptor, IN_DELETE);		//目录不存在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以上的系统由于用户权限管理更严格，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);		}		//扩展：可以执行其他shell命令，am(即activity manager)，可以打开某程序、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 !");}

android.mk folder

LOCAL_PATH := $(call my-dir)include $(CLEAR_VARS)LOCAL_MODULE:=observerLOCAL_SRC_FILES:=observer.cLOCAL_C_INCLUDES:= $(LOCAL_PATH)/includeLOCAL_LDLIBS += -L$(SYSROOT)/usr/lib -lloginclude $(BUILD_SHARED_LIBRARY)

运行后即可生成.so文件

System.loadlibray("observer")://即可完成加载，之后调用本地方法即可