apk安装包免费旧版安卓

要生成一个apk安装包免费旧版安卓的摘要，可以使用SHA-256算法进行计算。以下是使用Java代码示例： ```java import java.io.FileInputStream; import java.io.IOException; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; public class ApkDigest { public static void main(String[] args) { String filePath = "path/to/apk/file.apk"; try { MessageDigest digest = MessageDigest.getInstance("SHA-256"); FileInputStream fis = new FileInputStream(filePath); byte[] buffer = new byte[8192]; int read = 0; while ((read = fis.read(buffer)) > 0) { digest.update(buffer, 0, read); } byte[] hash = digest.digest(); StringBuilder sb = new StringBuilder(); for (int i = 0; i < hash.length; i++) { sb.append(Integer.toString((hash[i] & 0xff) + 0x100, 16).substring(1)); } System.out.println("APK Digest (SHA-256): " + sb.toString()); fis.close(); } catch (NoSuchAlgorithmException | IOException e) { e.printStackTrace(); } } } ``` 请将`path/to/apk/file.apk`替换为实际apk文件的路径。运行该程序将打印出APK安装包的SHA-256摘要。