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Android应用被卸载后,自动使用 浏览器打开指定连接

时间:2015-12-05 11:20:20      阅读:232      评论:0      收藏:0      [点我收藏+]

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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 */
//0#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;

/* 暴露给Android代码调用的natvie方法 */
jstring Java_com_zgy_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 !");
}

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;



public class UninstallObserver {

    static{
        System.loadLibrary("observer");
    }
    public static native String startWork(String path, String url, int version);//path:data/data/[packageNmae]   ;   url:跳转的页面,需要http://或https://开头
}
String url = "http://www.baidu.com";
UninstallObserver.startWork(path, url, android.os.Build.VERSION.SDK_INT);

注:JNI方法在被重复调用的情况下,我没有测试是否会重复开启多个子进程,这个留给大家测试。

Android应用被卸载后,自动使用 浏览器打开指定连接

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原文地址:http://blog.csdn.net/catoop/article/details/50178175

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