为walle打包工具增加Apk文件解析功能.md

Apk文件解析使用了Google提供的AXMLPrinter-1.0.0.jar库。从Maven仓库可以下载该库文件。

1. 从github上将walle项目clone到本地;
2. 使用IDEA导入walle工程，找到命令行打包模块walle-cli;
3. 将下载好的AXMLPrinter-1.0.0.jar库文件复制到walle-cli模块的libs文件夹下，并将其添加到添加为本模块的依赖;
4. 在src/java/com/meituan/android/walle/utils路径下新建ApkParser.java文件，用于解析Apk文件内的AndroidManifest.xml文件获取安装包信息。全部代码如下：

   package com.meituan.android.walle.utils;
   
   import android.content.res.AXmlResourceParser;
   import android.util.TypedValue;
   
   import org.xmlpull.v1.XmlPullParser;
   
   import java.util.Enumeration;
   import java.util.HashMap;
   import java.util.Map;
   import java.util.zip.ZipEntry;
   import java.util.zip.ZipFile;
   
   /**
    * Datetime: 2018/7/11 10:27
    * Author: zcj
    */
   public class ApkParser {
       /**
        * 读取apk
        * @param apkUrl
        * @return
        */
       public static Map<String,Object> readAPK(String apkUrl){
           ZipFile zipFile;
           Map<String,Object> map = new HashMap<String, Object>();
           try {
               zipFile = new ZipFile(apkUrl);
               Enumeration<?> enumeration = zipFile.entries();
               ZipEntry zipEntry = null;
               while (enumeration.hasMoreElements()) {
                   zipEntry = (ZipEntry) enumeration.nextElement();
                   if (zipEntry.isDirectory()) {
   
                   } else {
                       if ("androidmanifest.xml".equals(zipEntry.getName().toLowerCase())) {
                           AXmlResourceParser parser = new AXmlResourceParser();
                           parser.open(zipFile.getInputStream(zipEntry));
                           while (true) {
                               int type = parser.next();
                               if (type == XmlPullParser.END_DOCUMENT) {
                                   break;
                               }
                               String name = parser.getName();
                               if(null != name && name.toLowerCase().equals("manifest")){
                                   for (int i = 0; i != parser.getAttributeCount(); i++) {
                                       if ("versionName".equals(parser.getAttributeName(i))) {
                                           String versionName = getAttributeValue(parser, i);
                                           if(null == versionName){
                                               versionName = "";
                                           }
                                           map.put("versionName", versionName);
                                       } else if ("package".equals(parser.getAttributeName(i))) {
                                           String packageName = getAttributeValue(parser, i);
                                           if(null == packageName){
                                               packageName = "";
                                           }
                                           map.put("package", packageName);
                                       } else if("versionCode".equals(parser.getAttributeName(i))){
                                           String versionCode = getAttributeValue(parser, i);
                                           if(null == versionCode){
                                               versionCode = "";
                                           }
                                           map.put("versionCode", versionCode);
                                       }
                                   }
                                   break;
                               }
                           }
                       }
   
                   }
               }
               zipFile.close();
           } catch (Exception e) {
               map.put("code", "fail");
               map.put("error","读取apk失败");
           }
           return map;
       }
   
       private static String getAttributeValue(AXmlResourceParser parser, int index) {
           int type = parser.getAttributeValueType(index);
           int data = parser.getAttributeValueData(index);
           if (type == TypedValue.TYPE_STRING) {
               return parser.getAttributeValue(index);
           }
           if (type == TypedValue.TYPE_ATTRIBUTE) {
               return String.format("?%s%08X", getPackage(data), data);
           }
           if (type == TypedValue.TYPE_REFERENCE) {
               return String.format("@%s%08X", getPackage(data), data);
           }
           if (type == TypedValue.TYPE_FLOAT) {
               return String.valueOf(Float.intBitsToFloat(data));
           }
           if (type == TypedValue.TYPE_INT_HEX) {
               return String.format("0x%08X", data);
           }
           if (type == TypedValue.TYPE_INT_BOOLEAN) {
               return data != 0 ? "true" : "false";
           }
           if (type == TypedValue.TYPE_DIMENSION) {
               return Float.toString(complexToFloat(data)) + DIMENSION_UNITS[data & TypedValue.COMPLEX_UNIT_MASK];
           }
           if (type == TypedValue.TYPE_FRACTION) {
               return Float.toString(complexToFloat(data)) + FRACTION_UNITS[data & TypedValue.COMPLEX_UNIT_MASK];
           }
           if (type >= TypedValue.TYPE_FIRST_COLOR_INT && type <= TypedValue.TYPE_LAST_COLOR_INT) {
               return String.format("#%08X", data);
           }
           if (type >= TypedValue.TYPE_FIRST_INT && type <= TypedValue.TYPE_LAST_INT) {
               return String.valueOf(data);
           }
           return String.format("<0x%X, type 0x%02X>", data, type);
       }
   
       private static String getPackage(int id) {
           if (id >>> 24 == 1) {
               return "android:";
           }
           return "";
       }
   
       // ///////////////////////////////// ILLEGAL STUFF, DONT LOOK :)
       public static float complexToFloat(int complex) {
           return (float) (complex & 0xFFFFFF00) * RADIX_MULTS[(complex >> 4) & 3];
       }
   
       private static final float RADIX_MULTS[] =
               {
                       0.00390625F, 3.051758E-005F,
                       1.192093E-007F, 4.656613E-010F
               };
       private static final String DIMENSION_UNITS[] = { "px", "dip", "sp", "pt", "in", "mm", "", "" };
       private static final String FRACTION_UNITS[] = { "%", "%p", "", "", "", "", "", "" };
   }
   
   

5. 修改src/java/com/meituan/android/walle/commands/BatchCommand.java源文件，更改输出包命名，关键代码如下：

   Map<String, Object> apkInfo = ApkParser.readAPK(inputFile.getPath());
   final String versionName = (String) apkInfo.get("versionName");
   ......
   

6. 使用命令gradlew :walle-cli:shadowJar即可在build/libs目录下找到打包好的完整walle.jar工具包。