[DO NOT MERGE] Verify ringtone from ringtone picker is audio

To improve privacy.

Bug: 221041256
Test: atest com.android.settings.DefaultRingtonePreferenceTest
Change-Id: I0a9ca163f5ae91b67c9f957fde4c6db326b8718d
Merged-In: I0a9ca163f5ae91b67c9f957fde4c6db326b8718d
(cherry picked from commit e4c22580c9)

src/com/android/settings/DefaultRingtonePreference.java

@@ -22,6 +22,9 @@ import android.content.Intent;
 import android.media.RingtoneManager;
 import android.net.Uri;
 import android.util.AttributeSet;
+import android.util.Log;
+
+import androidx.annotation.VisibleForTesting;
 
 public class DefaultRingtonePreference extends RingtonePreference {
     private static final String TAG = "DefaultRingtonePreference";
@@ -43,6 +46,24 @@ public class DefaultRingtonePreference extends RingtonePreference {
 
     @Override
     protected void onSaveRingtone(Uri ringtoneUri) {
+        String mimeType = getContext().getContentResolver().getType(ringtoneUri);
+        if (mimeType == null) {
+            Log.e(TAG, "onSaveRingtone for URI:" + ringtoneUri
+                    + " ignored: failure to find mimeType (no access from this context?)");
+            return;
+        }
+
+        if (!(mimeType.startsWith("audio/") || mimeType.equals("application/ogg"))) {
+            Log.e(TAG, "onSaveRingtone for URI:" + ringtoneUri
+                    + " ignored: associated mimeType:" + mimeType + " is not an audio type");
+            return;
+        }
+
+        setActualDefaultRingtoneUri(ringtoneUri);
+    }
+
+    @VisibleForTesting
+    void setActualDefaultRingtoneUri(Uri ringtoneUri) {
         RingtoneManager.setActualDefaultRingtoneUri(mUserContext, getRingtoneType(), ringtoneUri);
     }