raise minimum API level to 33 (Android 13)

Android 13 is the oldest release with security support and also the
oldest release supported by our App Store.

Author: thestinger

app/build.gradle.kts

@@ -47,7 +47,7 @@ android {
 
     defaultConfig {
         applicationId = "app.attestation.auditor"
-        minSdk = 31
+        minSdk = 33
         targetSdk = 35
         versionCode = 89
         versionName = versionCode.toString()

app/src/main/java/app/attestation/auditor/AttestationProtocol.java

@@ -8,6 +8,7 @@
 import android.content.SharedPreferences;
 import android.content.pm.ApplicationInfo;
 import android.content.pm.PackageManager;
+import android.content.pm.PackageManager.ApplicationInfoFlags;
 import android.os.Build;
 import android.os.UserManager;
 import android.provider.Settings;
@@ -1295,15 +1296,6 @@ static Certificate[] getCertificateChain(final KeyStore keyStore, final String a
         return result;
     }
 
-    @SuppressWarnings("deprecation")
-    static ApplicationInfo getApplicationInfo(final PackageManager pm, final String packageName,
-            final int flags) throws PackageManager.NameNotFoundException {
-        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.TIRAMISU) {
-            return pm.getApplicationInfo(packageName, flags);
-        }
-        return pm.getApplicationInfo(packageName, PackageManager.ApplicationInfoFlags.of(flags));
-    }
-
     static AttestationResult generateSerialized(final Context context, final byte[] challengeMessage,
             String index, final String statePrefix) throws GeneralSecurityException, IOException {
         if (challengeMessage.length < CHALLENGE_MESSAGE_LENGTH) {
@@ -1406,7 +1398,9 @@ static AttestationResult generateSerialized(final Context context, final byte[]
             if (activeAdmins != null) {
                 for (final ComponentName name : activeAdmins) {
                     try {
-                        final ApplicationInfo info = getApplicationInfo(pm, name.getPackageName(), 0);
+                        final String packageName = name.getPackageName();
+                        final ApplicationInfo info =
+                                pm.getApplicationInfo(packageName, ApplicationInfoFlags.of(0));
                         if ((info.flags & ApplicationInfo.FLAG_SYSTEM) == 0) {
                             deviceAdminNonSystem = true;
                         }

app/src/main/java/app/attestation/auditor/RemoteVerifyJob.java

@@ -120,9 +120,7 @@ static void schedule(final Context context, int interval) {
                     .setRequiredNetworkType(JobInfo.NETWORK_TYPE_ANY)
                     .setEstimatedNetworkBytes(ESTIMATED_DOWNLOAD_BYTES, ESTIMATED_UPLOAD_BYTES);
             builder.setExpedited(true);
-            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
-                builder.setPriority(JobInfo.PRIORITY_MAX);
-            }
+            builder.setPriority(JobInfo.PRIORITY_MAX);
             if (scheduler.schedule(builder.build()) == JobScheduler.RESULT_FAILURE) {
                 throw new RuntimeException("job schedule failed");
             }