Android多渠道打包(三)：美团多渠道打包

本章将介绍美团多渠道打包方法

Android多渠道打包(一)：基础多渠道打包
Android多渠道打包(二)：友盟多渠道打包
Android多渠道打包(三)：美团多渠道打包
Android多渠道打包(四)：360多渠道打包
Android多渠道打包(五)：360多渠道打包+
Android多渠道打包(六)：maven&gradle
Android多渠道打包(七)：系列总结及展望

来源

本方法为美团点评技术团队2014.6.13日在《美团Android自动化之旅—生成渠道包》的文章中放出。

原理

将apk解包，然后在META-INF目录下创建一个以渠道号为文件名的空文件，再讲apk压缩，通过读取以渠道号为文件名的空文件的文件名来获取渠道号。

实现

方法1：使用python为apk文件添加渠道空文件

import zipfile
zipped = zipfile.ZipFile(your_apk, 'a', zipfile.ZIP_DEFLATED) 
empty_channel_file = "META-INF/channel_{channel}".format(channel=your_channel)
zipped.write(your_empty_file, empty_channel_file

* 方法2：使用java代码export出jar文件进行脚本打包

java代码如下（引用自魏成林）

public class Tool {

    private static final String CHANNEL_PREFIX = "/META-INF/";
    private static final String CHANNEL_PATH_MATCHER = "regex:/META-INF/mtchannel_[0-9a-zA-Z]{1,5}";
    private static String source_path;
    private static final String channel_file_name = "channel_list.txt";
    private static final String channel_flag = "channel_";

    public static void main(String[] args) throws Exception {
        if (args.length <= 0) {
            System.out.println("请输入文件路径作为参数");
            return;
        }

        final String source_apk_path = args[0];
        int last_index = source_apk_path.lastIndexOf("/") + 1;
        source_path = source_apk_path.substring(0, last_index);
        final String source_apk_name = source_apk_path.substring(last_index, source_apk_path.length());

        System.out.println("包路径：" + source_path);
        System.out.println("文件名：" + source_apk_name);

        ArrayList<String> channel_list = getChannelList(source_path + channel_file_name);
        final String last_name = ".apk";
        for (int i = 0; i < channel_list.size(); i++) {
            final String new_apk_path = source_path + source_apk_name.substring(0, source_apk_name.length() - last_name.length()) //
                    + "_" + channel_list.get(i) + last_name;
            copyFile(source_apk_path, new_apk_path);
            changeChannel(new_apk_path, channel_flag + channel_list.get(i));
        }
    }

    /**
 * 修改渠道号，原理是在apk的META-INF下新建一个文件名为渠道号的文件
 */
    public static boolean changeChannel(final String zipFilename, final String channel) {
        try (FileSystem zipfs = createZipFileSystem(zipFilename, false)) {

            final Path root = zipfs.getPath("/META-INF/");
            ChannelFileVisitor visitor = new ChannelFileVisitor();
            Files.walkFileTree(root, visitor);

            Path existChannel = visitor.getChannelFile();
            Path newChannel = zipfs.getPath(CHANNEL_PREFIX + channel);
            if (existChannel != null) {
                Files.move(existChannel, newChannel, StandardCopyOption.ATOMIC_MOVE);
            } else {
                Files.createFile(newChannel);
            }

            return true;

        } catch (IOException e) {
            System.out.println("添加渠道号失败：" + channel);
            e.printStackTrace();
        }

        return false;
    }

    private static FileSystem createZipFileSystem(String zipFilename, boolean create) throws IOException {
        final Path path = Paths.get(zipFilename);
        final URI uri = URI.create("jar:file:" + path.toUri().getPath());

        final Map<String, String> env = new HashMap<>();
        if (create) {
            env.put("create", "true");
        }
        return FileSystems.newFileSystem(uri, env);
    }

    private static class ChannelFileVisitor extends SimpleFileVisitor<Path> {
        private Path channelFile;
        private PathMatcher matcher = FileSystems.getDefault().getPathMatcher(CHANNEL_PATH_MATCHER);

        public Path getChannelFile() {
            return channelFile;
        }

        @Override
        public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
            if (matcher.matches(file)) {
                channelFile = file;
                return FileVisitResult.TERMINATE;
            } else {
                return FileVisitResult.CONTINUE;
            }
        }
    }

    /** 得到渠道列表 */
    private static ArrayList<String> getChannelList(String filePath) {
        ArrayList<String> channel_list = new ArrayList<String>();

        try {
            String encoding = "UTF-8";
            File file = new File(filePath);
            if (file.isFile() && file.exists()) { // 判断文件是否存在
                InputStreamReader read = new InputStreamReader(new FileInputStream(file), encoding);// 考虑到编码格式
                BufferedReader bufferedReader = new BufferedReader(read);
                String lineTxt = null;
                while ((lineTxt = bufferedReader.readLine()) != null) {
                    // System.out.println(lineTxt);
                    if (lineTxt != null && lineTxt.length() > 0) {
                        channel_list.add(lineTxt);
                    }
                }
                read.close();
            } else {
                System.out.println("找不到指定的文件");
            }
        } catch (Exception e) {
            System.out.println("读取文件内容出错");
            e.printStackTrace();
        }

        return channel_list;
    }

    /** 复制文件 */
    private static void copyFile(final String source_file_path, final String target_file_path) throws IOException {

        File sourceFile = new File(source_file_path);
        File targetFile = new File(target_file_path);

        BufferedInputStream inBuff = null;
        BufferedOutputStream outBuff = null;
        try {
            // 新建文件输入流并对它进行缓冲
            inBuff = new BufferedInputStream(new FileInputStream(sourceFile));

            // 新建文件输出流并对它进行缓冲
            outBuff = new BufferedOutputStream(new FileOutputStream(targetFile));

            // 缓冲数组
            byte[] b = new byte[1024 * 5];
            int len;
            while ((len = inBuff.read(b)) != -1) {
                outBuff.write(b, 0, len);
            }
            // 刷新此缓冲的输出流
            outBuff.flush();
        } catch (Exception e) {
            System.out.println("复制文件失败：" + target_file_path);
            e.printStackTrace();
        } finally {
            // 关闭流
            if (inBuff != null)
                inBuff.close();
            if (outBuff != null)
                outBuff.close();
        }
    }
}

将渠道号写入channel_list.text

channel_one
channel_two
channel_three

使用java命令脚本打包

java -jar tool.jar your.apk

在android代码中获取渠道id

public static String getChannel(Context context) {
        ApplicationInfo appinfo = context.getApplicationInfo();
        String sourceDir = appinfo.sourceDir;
        String ret = "";
        ZipFile zipfile = null;
        try {
            zipfile = new ZipFile(sourceDir);
            Enumeration<?> entries = zipfile.entries();
            while (entries.hasMoreElements()) {
                ZipEntry entry = ((ZipEntry) entries.nextElement());
                String entryName = entry.getName();
                if (entryName.startsWith("channel_")) {
                    ret = entryName;
                    break;
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (zipfile != null) {
                try {
                    zipfile.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

        String[] split = ret.split("_");
        if (split != null && split.length >= 2) {
            return ret.substring(split[0].length() + 1);

        } else {
            return "";
        }
    }

优缺点

比友盟高效点，只有解压缩和压缩，没有签名，兼容性也比较好，但是读取渠道号需要解压缩apk，速度比较慢

引用

美团Android自动化之旅—生成渠道包
魏成林：分享一种最简单的Android打渠道包的方法

来源

原理

实现

优缺点

引用

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