Android 渠道打包优化方案
项目迭代比较快，每次打二十多个渠道包，要花将近1个小时。
参考美团的优化方案：http://tech.meituan.com/mt-apk-packaging.html
因为APK其实就是ZIP的格式，所以，解压apk后，会看到里面有个META-INF目录。
由于META-INF目录并不会影响到APK的签名和运行，所以我们可以在META-INF目录里添加一个空文件，
不同的渠道就添加不同的空文件，文件名代表不同的渠道。
一、向apk中压入渠道文件（JAVA版）
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];//main方法传入的源apk的路径，是执行jar时命令行传入的，不懂的往下看。
String source_apk_path = "D:/apk/app.apk";
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 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 env = new HashMap<>();
if (create) {
env.put("create", "true");
}
return FileSystems.newFileSystem(uri, env);
}
private static class ChannelFileVisitor extends SimpleFileVisitor {
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 getChannelList(String filePath) {
ArrayList channel_list = new ArrayList();
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();
}
}
} 压入渠道文件Python版本：
zipped = zipfile.ZipFile("demo.apk", 'a', zipfile.ZIP_DEFLATED)
empty_channel_file = "META-INF/channel_{channel}".format(channel=input("请输入channel名"))
zipped.write(your_empty_file, empty_channel_file)
zipped.close()
public static String getChannal(Context context) {
if (channel != null) {
return channel;
}
final String start_flag = "META-INF/channel_";
ApplicationInfo appInfo = context.getApplicationInfo();
String sourceDir = appInfo.sourceDir;
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.contains(start_flag)) {
channel = entryName.replace(start_flag, "");
break;
}
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (zipfile != null) {
try {
zipfile.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
if (channel == null || channel.length() <= 0) {
channel = UNKNOWN_CHANNEL;//读不到渠道号就默认是官方渠道
}
return channel;
}比如友盟：
AnalyticsConfig.setChannel(ChanelManager.getChannel(this));