在代码中对apk文件重签名

废话不说，上代码：

public static boolean signApk(String sourcePath, String targetPath, String key,String passwd, String alias) {if (sourcePath == null || targetPath == null || passwd == null|| key == null)return false;File file = new File(sourcePath);if (!file.exists())return false;file=new File(key);if(!file.exists())return false;String cmd = "jarsigner -verbose -keystore " + key + " -signedjar " + targetPath + " " + sourcePath + " " + alias;Process process=null;try {process = Runtime.getRuntime().exec(cmd);OutputStream outputStream = process.getOutputStream();outputStream.write(passwd.getBytes());outputStream.close();InputStream inputStream = process.getInputStream();InputStreamReader reader = new InputStreamReader(inputStream);BufferedReader bufferedReader = new BufferedReader(reader);String line = null;while ((line = bufferedReader.readLine()) != null) {System.out.println(line);if(line.contains("incorrect"))return false;}bufferedReader.close();} catch (IOException e) {e.printStackTrace();return false;}return true;}

sourcePath是要签名的apk路径，targetPath是签名后生成的文件路径，key为使用的keystore路径，passwd为keystore对应的密码，alias是keystore的别名。

如果不知道怎么获取alias，可以使用下面的代码，alias可以在工程根目录下的alias.txt中查看：

public static void getAlias(String key, String passwd){String cmd = "cmd.exe /c keytool -list -v -keystore "+key+" -storepass "+passwd+" > ./alias.txt";try {Process process=null;process= Runtime.getRuntime().exec(cmd);if (process != null) {InputStream inputStream = process.getErrorStream();InputStreamReader reader = new InputStreamReader(inputStream);BufferedReader bufferedReader = new BufferedReader(reader);String line = null;while ((line = bufferedReader.readLine()) != null) {System.out.println(line);}bufferedReader.close();reader.close();inputStream.close();process.destroy();}} catch (IOException e) {e.printStackTrace();}}

其中keytool同样是JDK下的工具，这里直接使用了，所以也需要实现配置好JAVA_HOME。