本文章中用到的两个下载链接：
（1）电脑端差分包生成和合并工具
http://download.csdn.net/detail/suijing/9829716
（2）测试Demo项目源码下载地址
http://download.csdn.net/detail/suijing/9829722
测试验证环境：
项目目录结构：
build.gradle文件：
<pre>
apply plugin: 'com.android.application'
android {
compileSdkVersion 23
buildToolsVersion '23.0.1'
defaultConfig {
applicationId "com.yuyh.inc.update"
minSdkVersion 14
targetSdkVersion 23
versionCode 1
versionName "1.0"
ndk{
moduleName "ApkPatchLibrary"
abiFilters "armeabi", "armeabi-v7a", "x86"
}
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
sourceSets {
main {
jni.srcDirs = ['src/main/jni', 'src/main/jni/']
// jniLibs.srcDirs = ['libs'] // 若不想编译jni代码，可直接引用so库，ndk编译相关脚本注释掉
}
}
}
dependencies {
compile fileTree(include: ['*.jar'], dir: 'libs')
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:23.+'
}
</pre>
核心代码：
<pre>
package com.yyh.lib;
import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.ProgressBar;
import android.widget.Toast;
import com.yuyh.inc.update.R;
import com.yyh.lib.bsdiff.DiffUtils;
import com.yyh.lib.bsdiff.PatchUtils;
import com.yyh.lib.utils.FileUtils;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
public class MainActivity extends Activity {
private ProgressBar loadding;
// 成功
private static final int WHAT_SUCCESS = 1;
// 失败
private static final int WHAT_FAIL_PATCH = 0;
/**
* 老版本apk
*/
private String oldApkDir = Environment.getExternalStorageDirectory().toString() + "/bsdiff_old.apk";
/**
* 新版本apk
*/
private String newApkDir = Environment.getExternalStorageDirectory().toString() + "/bsdiff_new_build.apk";
/**
* 根据新老版本差分包生成的新版本apk
*/
private String destDir2 = Environment.getExternalStorageDirectory().toString() + "/bsdiff_new.apk";
/**
* 新老版本的增量更新包
*/
private String oldToNewPatchDir = Environment.getExternalStorageDirectory().toString() + "/old-to-new.patch";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
loadding = (ProgressBar) findViewById(R.id.loadding);
}
private Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case 0:
Toast.makeText(getApplicationContext(), "复制成功", Toast.LENGTH_SHORT).show();
break;
case 1:
Toast.makeText(getApplicationContext(), "复制失败", Toast.LENGTH_SHORT).show();
break;
case 2:
Toast.makeText(getApplicationContext(), "生成增新包成功", Toast.LENGTH_SHORT).show();
break;
case 3:
Toast.makeText(getApplicationContext(), "生成增新包失败", Toast.LENGTH_SHORT).show();
break;
case 4:
Toast.makeText(getApplicationContext(), "合成新版本成功", Toast.LENGTH_SHORT).show();
break;
case 5:
Toast.makeText(getApplicationContext(), "合成新版本失败", Toast.LENGTH_SHORT).show();
break;
default:
break;
}
}
};
/**
* 复制文件
* @param view
*/
public void copy(View view) {
loadding.setVisibility(View.VISIBLE);
new CopyTask().execute(oldApkDir, "bsdiff_old.apk", newApkDir, "bsdiff_new.apk");
}
/**
* 生成差分增量包
* @param view
*/
public void bsdiff(View view) {
loadding.setVisibility(View.VISIBLE);
new DiffTask().execute();
}
/**
* 合成新版本
* @param view
*/
public void bspatch(View view) {
loadding.setVisibility(View.VISIBLE);
new PatchTask().execute();
}
/**
* 安装老版本
* @param view
*/
public void installOld(View view) {
install(oldApkDir);
}
/**
* 安装新版本
* @param view
*/
public void installNew(View view) {
install(destDir2);
}
/**
* 复制文件线程
*/
private class CopyTask extends AsyncTask<String, Void, Integer> {
@Override
protected Integer doInBackground(String... params) {
for (int i = 0; i < params.length; i += 2) {
try {
File file = new File(params[i]);
if (!file.exists())
FileUtils.createFile(file);
InputStream is;
OutputStream os = new FileOutputStream(params[i]);
is = getAssets().open(params[i + 1]);
byte[] buffer = new byte[1024];
int length = is.read(buffer);
while (length > 0) {
os.write(buffer, 0, length);
length = is.read(buffer);
}
os.flush();
is.close();
os.close();
} catch (Exception e) {
handler.obtainMessage(1).sendToTarget();
return null;
}
}
handler.obtainMessage(0).sendToTarget();
return null;
}
@Override
protected void onPostExecute(Integer integer) {
super.onPostExecute(integer);
loadding.setVisibility(View.GONE);
}
}
/**
* 生成差分包线程
*
* @author yuyuhang
* @date 2016-1-25 下午12:24:34
*/
private class DiffTask extends AsyncTask<String, Void, Integer> {
@Override
protected Integer doInBackground(String... params) {
try {
int result = DiffUtils.getInstance().genDiff(oldApkDir, newApkDir, oldToNewPatchDir);
if (result == 0) {
handler.obtainMessage(2).sendToTarget();
return WHAT_SUCCESS;
} else {
handler.obtainMessage(3).sendToTarget();
return WHAT_FAIL_PATCH;
}
} catch (Exception e) {
e.printStackTrace();
}
return WHAT_FAIL_PATCH;
}
@Override
protected void onPostExecute(Integer integer) {
super.onPostExecute(integer);
loadding.setVisibility(View.GONE);
}
}
/**
* 差分包合成APK线程
*
* @author yuyuhang
* @date 2016-1-25 下午12:24:34
*/
private class PatchTask extends AsyncTask<String, Void, Integer> {
@Override
protected Integer doInBackground(String... params) {
try {
int result = PatchUtils.getInstance().patch(oldApkDir, destDir2, oldToNewPatchDir);
if (result == 0) {
handler.obtainMessage(4).sendToTarget();
return WHAT_SUCCESS;
} else {
handler.obtainMessage(5).sendToTarget();
return WHAT_FAIL_PATCH;
}
} catch (Exception e) {
e.printStackTrace();
}
return WHAT_FAIL_PATCH;
}
@Override
protected void onPostExecute(Integer integer) {
super.onPostExecute(integer);
loadding.setVisibility(View.GONE);
}
}
/**
* 安装软件
* @param dir
*/
private void install(String dir) {
String command = "chmod 777 " + dir;
Runtime runtime = Runtime.getRuntime();
try {
runtime.exec(command); // 可执行权限
} catch (IOException e) {
e.printStackTrace();
}
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setDataAndType(Uri.parse("file://" + dir), "application/vnd.android.package-archive");
startActivity(intent);
}
/*
public void appList(View view) {
Intent intent = new Intent(this, ApplistActivity.class);
startActivity(intent);
}
*/
}
</pre>
1、软件运行效果图
2、将Asset中的新旧版本复制到sd卡上
3、安装旧版本，效果图
4、差分生成增量更新包 old-to-new.patch
5、根据old-to-new.patch差分增量包生成新版本的安装包bsdiff_new.apk
6、安装合成的新版本bsdiff_new.apk
到此移动端的生成差分包和合成新版本就完成了。
但是实际中，不会在移动端来生成差分更新包，而是生成差分包之后移动端下载，然后合成新的安装包，然后进行更新。
所以可以通过下面的方式在电脑上生成差分新增包：
工具下载：http://download.csdn.net/detail/suijing/9829716
通过cmd打开命令窗口：
进入到目录中
（1）生成差量更新包文件old-to-new.patch：
bsdiff old.apk new.apk old-to-new.patch
这里生成的增量包 old-to-new.patch就可以用来跟老版本生成新的安装包了
（2）根据差量更新包old-to-new.patch生成新版本new2.apk ：
bspatch old.apk new2.apk old-to-new.patch
