安卓插件化之增量更新
- 开始准备
- 代码完成
- 拆分包
- 优缺点
开始准备
需要了解一点NDK的知识，查一下bsdiff的一点相关知识，代码和思想不是特别复杂，而且在此只是写了合并拆分包的逻辑，用Http下载的代码我也没有写每个人用的框架都不同就不多加一个东西了
我们使用的是bsdiff这一个三放的库，基于这个做的拆分和合并
在此我提供一个拆分包的工具 bsdiff.rar
代码完成
/**
* @author li
* 版本：1.0
* 创建日期：2020/6/29 08
* 描述：
*/
public class PathUtils {
// Used to load the 'native-lib' library on application startup.
static {
System.loadLibrary("update-lib");
}
/**
* native方法 使用路径为oldApkPath的apk与路径为patchPath的补丁包，合成新的apk，并存储于newApkPath
*
* 返回：0，说明操作成功
*
* @param oldApkPath 示例:/sdcard/old.apk
* @param newApkPath 示例:/sdcard/new.apk
* @param patchPath 示例:/sdcard/xx.patch
* @return
*/
public static native int patch(String oldApkPath, String newApkPath,
String patchPath);
}首先我们创建PathUtils 为了实现 path 方法 这里需要掉NDK 的基础，加载
update-lib 然后我们 ALT + ENTER 实现方法
生成update-lib.app 文件
#include <jni.h>
#include <string>
#include <android/log.h>
#include <exception>
#include "patchUtils.h"
extern "C"
JNIEXPORT jint JNICALL
Java_com_li_helloworld_utils_PathUtils_patch(JNIEnv *env, jclass type, jstring oldApkPath_,
jstring newApkPath_, jstring patchPath_) {
int argc = 4;
char *ch[argc];
ch[0] = (char *) "bspatch";
//string转Char
ch[1] = const_cast<char *>(env->GetStringUTFChars(oldApkPath_, 0));
ch[2] = const_cast<char *>(env->GetStringUTFChars(newApkPath_, 0));
ch[3] = const_cast<char *>(env->GetStringUTFChars(patchPath_, 0));
__android_log_print(ANDROID_LOG_INFO, "DDDDDDDDDDD", "old = %s ", ch[1]);
__android_log_print(ANDROID_LOG_INFO, "DDDDDDDDDDD", "new = %s ", ch[2]);
__android_log_print(ANDROID_LOG_INFO, "DDDDDDDDDDD", "patch = %s ", ch[3]);
//这个方法必须需要4个char数组 所以第0个我们放一个字符串
int ret = applypatch(argc, ch);
__android_log_print(ANDROID_LOG_INFO, "DDDDDDDDDDD", "applypatch result = %d ", ret);
//回收资源
env->ReleaseStringUTFChars(oldApkPath_, ch[1]);
env->ReleaseStringUTFChars(newApkPath_, ch[2]);
env->ReleaseStringUTFChars(patchPath_, ch[3]);
return ret;
}这里我们用到了applypatch(argc, ch);
这个方法 这个是我们完全从bsdiff里面粘贴过来的代码我将main方法名改成了applypatch方法
/*-
* Copyright 2003-2005 Colin Percival
* All rights reserved
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted providing that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#if 0
__FBSDID("$FreeBSD: src/usr.bin/bsdiff/bspatch/bspatch.c,v 1.1 2005/08/06 01:59:06 cperciva Exp $");
#endif
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <err.h>
#include <unistd.h>
#include <fcntl.h>
#include <android/log.h>
#include "bzip2/bzlib.h"
static off_t offtin(u_char *buf) {
off_t y;
y = buf[7] & 0x7F;
y = y * 256;
y += buf[6];
y = y * 256;
y += buf[5];
y = y * 256;
y += buf[4];
y = y * 256;
y += buf[3];
y = y * 256;
y += buf[2];
y = y * 256;
y += buf[1];
y = y * 256;
y += buf[0];
if (buf[7] & 0x80) y = -y;
return y;
}
int applypatch(int argc, char *argv[]) {
FILE *f, *cpf, *dpf, *epf;
BZFILE *cpfbz2, *dpfbz2, *epfbz2;
int cbz2err, dbz2err, ebz2err;
int fd;
ssize_t oldsize, newsize;
ssize_t bzctrllen, bzdatalen;
u_char header[32], buf[8];
u_char *old, *new;
off_t oldpos, newpos;
off_t ctrl[3];
off_t lenread;
off_t i;
if (argc != 4) errx(1, "usage: %s oldfile newfile patchfile\n", argv[0]);
__android_log_print(ANDROID_LOG_INFO, "DDDDDDDDDDD", "-------test %s ", argv[3]);
/* Open patch file */
f = fopen(argv[3], "r");
if (f == NULL) {
__android_log_print(ANDROID_LOG_INFO, "DDDDDDDDDDD", "------->>>>>> ");
err(1, "fopen(%s)", argv[3]);
} else {
__android_log_print(ANDROID_LOG_INFO, "DDDDDDDDDDD", "<<<<<<<<<< ");
}
__android_log_print(ANDROID_LOG_INFO, "DDDDDDDDDDD", "++++++++test %s ", argv[3]);
/*
File format:
0 8 "BSDIFF40"
8 8 X
16 8 Y
24 8 sizeof(newfile)
32 X bzip2(control block)
32+X Y bzip2(diff block)
32+X+Y ??? bzip2(extra block)
with control block a set of triples (x,y,z) meaning "add x bytes
from oldfile to x bytes from the diff block; copy y bytes from the
extra block; seek forwards in oldfile by z bytes".
*/
/* Read header */
if (fread(header, 1, 32, f) < 32) {
if (feof(f))
errx(1, "Corrupt patch\n");
err(1, "fread(%s)", argv[3]);
}
/* Check for appropriate magic */
if (memcmp(header, "BSDIFF40", 8) != 0)
errx(1, "Corrupt patch\n");
/* Read lengths from header */
bzctrllen = offtin(header + 8);
bzdatalen = offtin(header + 16);
newsize = offtin(header + 24);
if ((bzctrllen < 0) || (bzdatalen < 0) || (newsize < 0))
errx(1, "Corrupt patch\n");
/* Close patch file and re-open it via libbzip2 at the right places */
if (fclose(f))
err(1, "fclose(%s)", argv[3]);
if ((cpf = fopen(argv[3], "r")) == NULL)
err(1, "fopen(%s)", argv[3]);
if (fseeko(cpf, 32, SEEK_SET))
err(1, "fseeko(%s, %lld)", argv[3],
(long long) 32);
if ((cpfbz2 = BZ2_bzReadOpen(&cbz2err, cpf, 0, 0, NULL, 0)) == NULL)
errx(1, "BZ2_bzReadOpen, bz2err = %d", cbz2err);
if ((dpf = fopen(argv[3], "r")) == NULL)
err(1, "fopen(%s)", argv[3]);
if (fseeko(dpf, 32 + bzctrllen, SEEK_SET))
err(1, "fseeko(%s, %lld)", argv[3],
(long long) (32 + bzctrllen));
if ((dpfbz2 = BZ2_bzReadOpen(&dbz2err, dpf, 0, 0, NULL, 0)) == NULL)
errx(1, "BZ2_bzReadOpen, bz2err = %d", dbz2err);
if ((epf = fopen(argv[3], "r")) == NULL)
err(1, "fopen(%s)", argv[3]);
if (fseeko(epf, 32 + bzctrllen + bzdatalen, SEEK_SET))
err(1, "fseeko(%s, %lld)", argv[3],
(long long) (32 + bzctrllen + bzdatalen));
if ((epfbz2 = BZ2_bzReadOpen(&ebz2err, epf, 0, 0, NULL, 0)) == NULL)
errx(1, "BZ2_bzReadOpen, bz2err = %d", ebz2err);
if (((fd = open(argv[1], O_RDONLY, 0)) < 0) ||
((oldsize = lseek(fd, 0, SEEK_END)) == -1) ||
((old = malloc(oldsize + 1)) == NULL) ||
(lseek(fd, 0, SEEK_SET) != 0) ||
(read(fd, old, oldsize) != oldsize) ||
(close(fd) == -1))
err(1, "%s", argv[1]);
if ((new = malloc(newsize + 1)) == NULL) err(1, NULL);
oldpos = 0;
newpos = 0;
while (newpos < newsize) {
/* Read control data */
for (i = 0; i <= 2; i++) {
lenread = BZ2_bzRead(&cbz2err, cpfbz2, buf, 8);
if ((lenread < 8) || ((cbz2err != BZ_OK) &&
(cbz2err != BZ_STREAM_END)))
errx(1, "Corrupt patch\n");
ctrl[i] = offtin(buf);
};
/* Sanity-check */
if (newpos + ctrl[0] > newsize)
errx(1, "Corrupt patch\n");
/* Read diff string */
lenread = BZ2_bzRead(&dbz2err, dpfbz2, new + newpos, ctrl[0]);
if ((lenread < ctrl[0]) ||
((dbz2err != BZ_OK) && (dbz2err != BZ_STREAM_END)))
errx(1, "Corrupt patch\n");
/* Add old data to diff string */
for (i = 0; i < ctrl[0]; i++)
if ((oldpos + i >= 0) && (oldpos + i < oldsize))
new[newpos + i] += old[oldpos + i];
/* Adjust pointers */
newpos += ctrl[0];
oldpos += ctrl[0];
/* Sanity-check */
if (newpos + ctrl[1] > newsize)
errx(1, "Corrupt patch\n");
/* Read extra string */
lenread = BZ2_bzRead(&ebz2err, epfbz2, new + newpos, ctrl[1]);
if ((lenread < ctrl[1]) ||
((ebz2err != BZ_OK) && (ebz2err != BZ_STREAM_END)))
errx(1, "Corrupt patch\n");
/* Adjust pointers */
newpos += ctrl[1];
oldpos += ctrl[2];
};
/* Clean up the bzip2 reads */
BZ2_bzReadClose(&cbz2err, cpfbz2);
BZ2_bzReadClose(&dbz2err, dpfbz2);
BZ2_bzReadClose(&ebz2err, epfbz2);
if (fclose(cpf) || fclose(dpf) || fclose(epf))
err(1, "fclose(%s)", argv[3]);
/* Write the new file */
if (((fd = open(argv[2], O_CREAT | O_TRUNC | O_WRONLY, 0666)) < 0) ||
(write(fd, new, newsize) != newsize) || (close(fd) == -1))
err(1, "%s", argv[2]);
free(new);
free(old);
return 0;
}接下来我们说一下
oldApkPath 怎么获取
String packageName = MainActivity.this.getPackageName();
ApplicationInfo appInfo = context.getPackageManager().getApplicationInfo(packageName, 0);
String oldApkPath = appInfo.sourceDir;新地址和patch.patch 我是手动放在手机的根目录下
String mPath = Environment.getExternalStorageDirectory().getAbsolutePath()+File.separator+"patch.patch";
String NewPath = Environment.getExternalStorageDirectory().getAbsolutePath()+File.separator+"new.apk";
//执行
PathUtils.patch(oldApkPath ,NewPath,mPath);执行完毕后安装新apk
File appFile = new File(NewPath);
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {/*context.getApplicationContext().getPackageName() + ".fileProvider"*/
Uri fileUri = FileProvider.getUriForFile(context, "包名.FileProvider", appFile);
intent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
intent.setDataAndType(fileUri, "application/vnd.android.package-archive");
} else {
intent.setDataAndType(Uri.fromFile(appFile), "application/vnd.android.package-archive");
}
if (context.getPackageManager().queryIntentActivities(intent, 0).size() > 0) {
context.startActivity(intent);
}特别注意 要在Mainifest中添加
<!--7.0 解决调用系统打开文件 android.os.FileUriExposedException-->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES"/>
<provider
android:name="androidx.core.content.FileProvider"
android:authorities="包名.FileProvider"
android:exported="false"
android:grantUriPermissions="true"
tools:replace="android:authorities">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
tools:replace="android:resource"
android:resource="@xml/filepaths" />
</provider>@xml/filepaths
<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
<external-path
name="包名.filepath"
path="." />
</paths>拆分包
下载 bsdiff.rar 里面有两个文件和我的一个Demol
这里 我们SHEIFT +鼠标右建 选择在此处打开PowerShell 窗口（S）
我们将我们的新apk 和老版本Apk 分布起好不同的名字
我这里加 old.apk 和 new.apk
在窗口输入
.\bsdiff old.apk new.apk patch.patch回车后 就会生成 patch.patch 这就是我们的差异包，将这个包放在手机根目录下就可以进行升级
优缺点
有点：个人感觉 代码逻辑不难，会减少Apk的体积，减少流量成本和升级时间
缺点：如果有很多个版本需要生成各种版本的拆分包，或者判断版本差距大的换进行全量更新
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