转载请说明出处http://blog.csdn.net/andywuchuanlong
记得上次在南昌中兴的一个项目中遇到过一个这样的需求：一个app可以给多个渠道商去运营，渠道商推广出去可以获得相应的推广金额。那么这种情况下就必须要使得这个app能够唯一的标志一个渠道商。那个时候我们在这个项目中的解决方案是：让用户在app中手动填入渠道商的工号，我现在想想这种方式也是醉了，真不知道那个时候项目经理是怎么想的，竟然会给出这样的方案。
这次的项目中又遇到了这个问题：需求是这个app能够给多个渠道商去推广，渠道商可以获得推广金额。这次我提出的解决方案是：先把打包后的app解压，然后在assets目录中写入渠道商的唯一标识id，然后压缩app，压缩完毕重新签名app，之后就大工告成。用户在第一次进入app的时候，会把assets中的id读出来，提交到服务器，就完美的解决了这个用户是此渠道商的推广所获得的用户。
首先第一步：把app解压，删除META-INF文件夹中的CERT.RSA和CERT.SF两个文件
第二步：读取解压后的assets目录中的id.txt文件，写入渠道商的id
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File file = new File("d:/app/assets/id.txt");
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OutputStream outputStream = new FileOutputStream(file);
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outputStream.write(user.getId().toString().getBytes());
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outputStream.flush();
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outputStream.close();
第三步：压缩写入渠道商id后的所有app文件
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ZipCompressor zc = new ZipCompressor("d:/play.apk");
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zc.compressExe("d:/app/");
具体的压缩代码如下：
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package com.xyc.signSystem.utils;
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import java.io.BufferedInputStream;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileOutputStream;
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import java.util.zip.CRC32;
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import java.util.zip.CheckedOutputStream;
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import org.apache.tools.zip.ZipEntry;
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import org.apache.tools.zip.ZipOutputStream;
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public class ZipCompressor {
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static final int BUFFER = 8192;
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private File zipFile;
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public ZipCompressor(String pathName) {
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zipFile = new File(pathName);
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}
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public void compressExe(String srcPathName) {
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File file = new File(srcPathName);
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if (!file.exists()) {
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throw new RuntimeException(srcPathName + "不存在！");
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}
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try {
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FileOutputStream fileOutputStream = new FileOutputStream(zipFile);
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CheckedOutputStream cos = new CheckedOutputStream(fileOutputStream,
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new CRC32());
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ZipOutputStream out = new ZipOutputStream(cos);
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String basedir = "";
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compressByType(file, out, basedir);
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out.close();
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} catch (Exception e) {
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e.printStackTrace();
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throw new RuntimeException(e);
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}
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}
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private void compressByType(File file, ZipOutputStream out, String basedir) {
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if (basedir.equals("play/")) {
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basedir = "";
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}
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if (file.isDirectory()) {
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this.compressDirectory(file, out, basedir);
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} else {
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this.compressFile(file, out, basedir);
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}
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}
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boolean isFirst = true;
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private void compressDirectory(File dir, ZipOutputStream out, String basedir) {
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if (!dir.exists()) {
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return;
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}
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if (basedir.equals("play/")) {
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basedir = "";
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}
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File[] files = dir.listFiles();
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for (int i = 0; i < files.length; i++) {
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compressByType(files[i], out, basedir + dir.getName() + "/");
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}
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}
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private void compressFile(File file, ZipOutputStream out, String basedir) {
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if (!file.exists()) {
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isFirst = false;
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return;
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}
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if (basedir.equals("play/")) {
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basedir = "";
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}
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try {
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BufferedInputStream bis = new BufferedInputStream(
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new FileInputStream(file));
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ZipEntry entry = new ZipEntry(basedir + file.getName());
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out.putNextEntry(entry);
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int count;
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byte data[] = new byte[BUFFER];
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while ((count = bis.read(data, 0, BUFFER)) != -1) {
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out.write(data, 0, count);
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}
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bis.close();
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} catch (Exception e) {
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throw new RuntimeException(e);
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}
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}
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}
第四步：压缩完毕之后，此时的包是没有签名过的，所以还需要签名，签名可以使用jarsigner工具，首先我们要寻找到java的安装目录
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<span style="white-space:pre"> </span>public String getJavaPath() {
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String javaPath = (String) System.getenv("Path");
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String paths[]= javaPath.split(";");
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String myPath = null;
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for(String path:paths){
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if (path.contains("Java")&&!path.contains("jre")
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&&path.contains("bin") ){
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myPath = path;
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break;
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}
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}
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return myPath+"\\";
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}
签名：
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<span style="white-space:pre"> </span>String javaPath = getJavaPath();
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Runtime rt = Runtime.getRuntime();
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String cmd = javaPath
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+ "jarsigner -verbose"
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+ " -keystore "+ keystorePath
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+ " -storepass player"
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+ " -signedjar "+signedApkPath
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+ " -digestalg SHA1 -sigalg MD5withRSA "
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+ unsignedApkPath
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+ " player";
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Process child = rt.exec(cmd);
OK，签名成功。
更改已经签名的app中的内容
原文：http://blog.csdn.net/andywuchuanlong/article/details/46680635
