开发人员可以使用Google提供的Android应用程序完整性和安全性检查工具来验证由Play Store传递的应用程序的完整性。这个工具将检查应用程序包的签名，并与应用程序的签名证书进行比较。

以下是一个代码示例，演示如何使用此工具检查应用程序的完整性：

try {
    PackageInfo packageInfo = getPackageManager().getPackageInfo("com.example.package", PackageManager.GET_SIGNATURES);
    String apkPath = packageInfo.applicationInfo.sourceDir;

    // Generate hash of the APK file
    MessageDigest messageDigest = MessageDigest.getInstance("SHA");
    byte[] signature = messageDigest.digest(readFile(apkPath));

    // Get the signature hash of the app from the Play Store
    AndroidAppDeliveryData appDeliveryData = new AndroidAppDeliveryData.Builder()
            .setPackageName("com.example.package")
            .build();

    AndroidAppDeliveryClient client = AndroidAppDelivery.getClient(this);
    client.getMetadata(appDeliveryData)
            .addOnSuccessListener(metadata -> {
                byte[] expectedSignature = metadata.getDigestSha256().toByteArray();

                // Compare hash values
                if (MessageDigest.isEqual(signature, expectedSignature)) {
                    Log.d("Integrity check", "App signature matches!");
                } else {
                    Log.e("Integrity check", "App signature does not match!");
                }
            })
            .addOnFailureListener(e -> {
                Log.e("Integrity check", "Failed to get app delivery metadata.", e);
            });
} catch (PackageManager.NameNotFoundException | NoSuchAlgorithmException e) {
    Log.e("Integrity check", "Error while checking app integrity.", e);
}

private static byte[] readFile(String path) {
    try {
        FileInputStream fis = new FileInputStream(path);
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        byte[] buf = new byte[1024];
        int read;
        while ((read = fis.read(buf)) != -1) {
            bos.write(buf, 0, read);
        }
        fis.close();
        return bos.toByteArray();
    } catch (IOException e) {
        return null;
    }
}

在此示例中，我们首先获取应用程序的信息和APK文件的路径。然后，我们使用SHA算法生成APK文件的哈希值，以便稍后将其与Play Store提供的哈希值进行比较。接下来，我们使用AndroidAppDeliveryClient从Play Store获取应用程序的元数据，并在onSuccessListener中比较哈希值。如果两个哈希值匹配，则表示