营销网站的概念搜索引擎营销成功案例
本文，提供“Android应用被卸载后，自动使用 浏览器打开指定连接”的方法。
原理：在安卓程序中某处，基于JNI调用C代码开启一个子进程监控应用在系统中的文件目录，一旦应用被卸载，该目录将会被系统删除，此时触发子进程执行相关代码（本例调用浏览器执行打开一个连接）
1、在安卓项目下创建jni目录
2、在jni目录下创建文件observer.c
/** 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[] = "OnAppUninstall";
static jboolean b_IS_COPY = JNI_TRUE;/* native方法定义 */
JNIEXPORT jstring JNICALL Java_com_zgy_catchuninstallself_UninstallObserver_startWork(JNIEnv* env, jobject thiz, jstring dirStr, jstring data_packagedir, jstring activity,jstring action, jstring action_data, jstring userSerial) {jstring tag = (*env)->NewStringUTF(env, c_TAG);LOG_DEBUG((*env)->GetStringUTFChars(env, tag, &b_IS_COPY),(*env)->GetStringUTFChars(env,(*env)->NewStringUTF(env, "start------------------"),&b_IS_COPY));//初始化logLOG_DEBUG((*env)->GetStringUTFChars(env, tag, &b_IS_COPY),(*env)->GetStringUTFChars(env, (*env)->NewStringUTF(env, "init OK"),&b_IS_COPY));//fork子进程，以执行轮询任务pid_t pid = fork();char showpid[10];sprintf(showpid, "%d", pid);LOG_INFO((*env)->GetStringUTFChars(env, tag, &b_IS_COPY),(*env)->GetStringUTFChars(env, (*env)->NewStringUTF(env, showpid),&b_IS_COPY));if (pid < 0) {//出错logLOG_ERROR((*env)->GetStringUTFChars(env, tag, &b_IS_COPY),(*env)->GetStringUTFChars(env,(*env)->NewStringUTF(env, "fork failed !!!"),&b_IS_COPY));} else if (pid == 0) {LOG_DEBUG((*env)->GetStringUTFChars(env, tag, &b_IS_COPY),(*env)->GetStringUTFChars(env,(*env)->NewStringUTF(env, "childen process"),&b_IS_COPY));int fileDescriptor = inotify_init();if (fileDescriptor < 0) {//初始化文件监听器失败LOG_DEBUG((*env)->GetStringUTFChars(env, tag, &b_IS_COPY),(*env)->GetStringUTFChars(env,(*env)->NewStringUTF(env,"inotify_init failed !!!"), &b_IS_COPY));exit(1);}LOG_DEBUG((*env)->GetStringUTFChars(env, tag, &b_IS_COPY),(*env)->GetStringUTFChars(env,(*env)->NewStringUTF(env, "will creat a lockfile"),&b_IS_COPY));LOG_DEBUG((*env)->GetStringUTFChars(env, tag, &b_IS_COPY),(*env)->GetStringUTFChars(env, dirStr, &b_IS_COPY));LOG_DEBUG((*env)->GetStringUTFChars(env, tag, &b_IS_COPY),(*env)->GetStringUTFChars(env,(*env)->NewStringUTF(env, "creat a new process"),&b_IS_COPY));//子进程注册"/data/data/{package}"目录监听器int watchDescriptor;watchDescriptor = inotify_add_watch(fileDescriptor,(*env)->GetStringUTFChars(env, dirStr, &b_IS_COPY), 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);}//开始监听LOG_DEBUG((*env)->GetStringUTFChars(env, tag, &b_IS_COPY),(*env)->GetStringUTFChars(env,(*env)->NewStringUTF(env, "start observer"),&b_IS_COPY));size_t readBytes = read(fileDescriptor, p_buf,sizeof(struct inotify_event));//等待5秒LOG_DEBUG((*env)->GetStringUTFChars(env, tag, &b_IS_COPY),(*env)->GetStringUTFChars(env,(*env)->NewStringUTF(env, "sleep 2 seconds"),&b_IS_COPY));sleep(2);//如果是覆盖安装跳过FILE *p_appDir = fopen(data_packagedir, "r");if (p_appDir != NULL) {LOG_DEBUG((*env)->GetStringUTFChars(env, tag, &b_IS_COPY),(*env)->GetStringUTFChars(env,(*env)->NewStringUTF(env, "reinstall"),&b_IS_COPY));exit(1);}//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free(p_buf);inotify_rm_watch(fileDescriptor, IN_DELETE);//目录不存在logLOG_DEBUG((*env)->GetStringUTFChars(env, tag, &b_IS_COPY),(*env)->GetStringUTFChars(env,(*env)->NewStringUTF(env, "uninstalled"), &b_IS_COPY));//执行命令am start -a android.intent.action.VIEW -d http://ww.baidu.com// execlp("am", "am", "start", "-a", "android.intent.action.VIEW", "-d", "http://ww.baidu.com", (char *)NULL);//4.2以上的系统由于用户权限管理更严格，需要加上 --user 0if (userSerial == NULL) {// 执行命令am start -a android.intent.action.VIEW -d $(url)execlp("am", "am", "start", "-a", "android.intent.action.VIEW","-d", (*env)->GetStringUTFChars(env, action_data, &b_IS_COPY),(char *) NULL);} else {if (activity == NULL|| (*env)->GetStringUTFLength(env, activity) < 1) {execlp("am", "am", "start", "--user",(*env)->GetStringUTFChars(env, userSerial, &b_IS_COPY),"-a",(*env)->GetStringUTFChars(env, action, &b_IS_COPY),"-d", (*env)->GetStringUTFChars(env, action_data, &b_IS_COPY),(char *) NULL);} else {if (action == NULL|| (*env)->GetStringUTFLength(env, action) < 1) {if (action_data == NULL|| (*env)->GetStringUTFLength(env, action_data) < 1) {execlp("am", "am", "start", "--user",(*env)->GetStringUTFChars(env, userSerial,&b_IS_COPY), "-n",(*env)->GetStringUTFChars(env, activity,&b_IS_COPY), (char *) NULL);} else {execlp("am", "am", "start", "--user",(*env)->GetStringUTFChars(env, userSerial,&b_IS_COPY), "-n",(*env)->GetStringUTFChars(env, activity,&b_IS_COPY), "-d",(*env)->GetStringUTFChars(env, action_data,&b_IS_COPY), (char *) NULL);}} else {if (action_data == NULL|| (*env)->GetStringUTFLength(env, action_data) < 1) {execlp("am", "am", "start", "--user",(*env)->GetStringUTFChars(env, userSerial,&b_IS_COPY), "-n",(*env)->GetStringUTFChars(env, activity,&b_IS_COPY), "-a",(*env)->GetStringUTFChars(env, action,&b_IS_COPY), (char *) NULL);} else {execlp("am", "am", "start", "--user",(*env)->GetStringUTFChars(env, userSerial,&b_IS_COPY), "-n",(*env)->GetStringUTFChars(env, activity,&b_IS_COPY), "-a",(*env)->GetStringUTFChars(env, action,&b_IS_COPY), "-d",(*env)->GetStringUTFChars(env, action_data,&b_IS_COPY), (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LOG_DEBUG((*env)->GetStringUTFChars(env, tag, &b_IS_COPY),(*env)->GetStringUTFChars(env,(*env)->NewStringUTF(env, "fork pid > 0"), &b_IS_COPY));}LOG_DEBUG((*env)->GetStringUTFChars(env, tag, &b_IS_COPY),(*env)->GetStringUTFChars(env,(*env)->NewStringUTF(env, "end------------------"),&b_IS_COPY));return (*env)->NewStringUTF(env, showpid);
}
3、在jni目录下创建文件Android.mk
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE:=observer
LOCAL_SRC_FILES:=observer.c
LOCAL_C_INCLUDES:= $(LOCAL_PATH)/include
LOCAL_LDLIBS += -L$(SYSROOT)/usr/lib -llog
include $(BUILD_SHARED_LIBRARY)4、在创建natvie方法，并在Android中调用JNI方法
package com.zgy.catchuninstallself;import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;import android.content.Context;
import android.content.SharedPreferences;
import android.content.pm.PackageInfo;
import android.os.Build;
import android.util.Log;/*** 应用程序卸载监控，入口调用方法：openUrlWhenUninstall(……)** @author SHANHY(365384722@QQ.COM)* @date 2015年12月15日*/
public class UninstallObserver {// path：data/data/[packageNmae]/lib // url:跳转的页面，需要http://或https://开头/*** Native 方法* * @param dirStr 要监听的目录，传值：/data/data/{packageNmae}/lib* @param activity Activity对象* @param action android.intent.action.VIEW* @param actionData 要在浏览器中打开的URL* @param userSerial* @return * @author SHANHY* @date 2015年12月15日*/private static native String startWork(String dirStr,String dataPackageDir, String activity, String action, String actionData, String userSerial);static {System.loadLibrary("observer");}private static SharedPreferences sharedPreferences;private static SharedPreferences.Editor editor;/*** 在需要开启子进程监听的地方调用该方法* * @param context* @param openUrl* @author SHANHY* @date 2015年12月15日*/public static void openUrlWhenUninstall(Context context, String openUrl) {sharedPreferences = context.getSharedPreferences("process", Context.MODE_PRIVATE);editor = sharedPreferences.edit();String pid = sharedPreferences.getString("pid", "0");if (checkChildProcess(context, pid)) {Log.i("OnAppUninstall", "已经开启过守护进程");return;}Log.i("OnAppUninstall", "执行开启过守护进程");String dataPackageDir = context.getApplicationInfo().dataDir;String dirStr = context.getApplicationInfo().dataDir + "/lib";// 监听lib目录是因为：lib目录在进行应用清理的时候不会被清理String activity = null;if (checkInstall(context, "com.android.browser")) {activity = "com.android.browser/com.android.browser.BrowserActivity";}String action = "android.intent.action.VIEW";String gpid;if (Build.VERSION.SDK_INT < 17) {gpid = startWork(dirStr, dataPackageDir, activity, action, openUrl, null);} else {//4.2以上的系统由于用户权限管理更严格，调用API有所区别gpid = startWork(dirStr, dataPackageDir, activity, action, openUrl, getUserSerial(context));}if (gpid != null && !gpid.equals("") && !gpid.equals("0")) {Log.i("OnAppUninstall", "获得守护进程pid-->" + gpid);editor.putString("pid", gpid);editor.commit();}}/*** 检查安装* * @param context* @param packageName* @return* @author SHANHY* @date 2015年12月15日*/private static boolean checkInstall(Context context, String packageName) {try {PackageInfo packageInfo = context.getPackageManager().getPackageInfo(packageName, 0);if (packageInfo == null) {return false;} else {return true;}} catch (Exception e) {return false;}}/*** 获取 UserSerial* * @param ctx* @return* @author SHANHY* @date 2015年12月15日*/private static String getUserSerial(Context ctx) {Object userManager = ctx.getSystemService("user");if (userManager == null) {return null;}try {Method myUserHandleMethod = android.os.Process.class.getMethod("myUserHandle", (Class<?>[]) null);Object myUserHandle = myUserHandleMethod.invoke(android.os.Process.class, (Object[]) null);Method getSerialNumberForUser = userManager.getClass().getMethod("getSerialNumberForUser", myUserHandle.getClass());long userSerial = (Long) getSerialNumberForUser.invoke(userManager, myUserHandle);return String.valueOf(userSerial);} catch (NoSuchMethodException e) {} catch (IllegalArgumentException e) {} catch (IllegalAccessException e) {} catch (InvocationTargetException e) {}return null;}/*** 检查子进程* * @param context* @param mpid* @return* @author SHANHY* @date 2015年12月15日*/private static boolean checkChildProcess(Context context, String mpid) {boolean resflag = false;int mypid = android.os.Process.myPid();Log.i("OnAppUninstall", "mypid-->" + mypid);BufferedReader in = null;long starttime = System.currentTimeMillis();List<Map<String, String>> listdata = new ArrayList<Map<String, String>>();try {Process p = Runtime.getRuntime().exec("ps");in = new BufferedReader(new InputStreamReader(p.getInputStream()));String line = null;String[] temp;boolean flag = false;
// int length = 0;while ((line = in.readLine()) != null) {// Log.i("OnAppUninstall", "ps-->" + line);if (!flag) {flag = true;continue;}line = line.replaceAll(" +", " ");temp = line.split(" ");
// System.out.println(context.getPackageName());
// System.out.println(temp[8]);if (temp[8].trim().equals(context.getPackageName().trim()) && (temp[2].trim().equals(mypid + "") || temp[2].trim().equals("1"))) {Log.i("OnAppUninstall", "get it");Map<String, String> map = new HashMap<String, String>();map.put("pid", temp[1]);map.put("pname", temp[8]);listdata.add(map);}}} catch (IOException e) {e.printStackTrace();} finally {if (in != null) {try {in.close();} catch (IOException e) {e.printStackTrace();}in = null;}}long endtime = System.currentTimeMillis();long spendtime = endtime - starttime;for (int i = 0; i < listdata.size(); i++) {if (listdata.get(i).get("pid").equals(mpid)) {resflag = true;} else {Log.w("OnAppUninstall", "捕获到多余守护进程-->" + listdata.get(i).get("pid") + " " + listdata.get(i).get("pname"));try {android.os.Process.killProcess(Integer.valueOf(listdata.get(i).get("pid").trim()));} catch (NumberFormatException e) {e.printStackTrace();}}Log.i("OnAppUninstall", listdata.get(i).get("pid") + " " + listdata.get(i).get("pname"));}Log.i("OnAppUninstall", "spendtime-->" + spendtime);return resflag;}
}
String url = "http://www.baidu.com";
UninstallObserver.openUrlWhenUninstall(this, url);注：本文已经更新，并解决了之前“fork多个子进程”的问题。