Refactor answer callback for async DNS query JAVA API

1. refactor AnswerCallback with a generic type
2. support onError in AnswerCallback
3. Fix minor problem reported from API Review

Bug: 124882626
Test: built, flashed, booted
      atest DnsResolverTest DnsPacketTest

Change-Id: I685c9989f8401acb63d2e83f552b2d5b20c41af0

1 files changed, 9 insertions, 2 deletions

diff --git a/core/java/android/net/ParseException.java b/core/java/android/net/ParseException.java
index 2380e863d043..9d4727a84bc0 100644
--- a/core/java/android/net/ParseException.java
+++ b/core/java/android/net/ParseException.java
@@ -16,15 +16,22 @@
 
 package android.net;
 
+import android.annotation.NonNull;
+
 /**
- * Thrown when parsing a URL fails.
+ * Thrown when parsing failed.
  */
 // See non-public class {@link WebAddress}.
 public class ParseException extends RuntimeException {
     public String response;
 
-    ParseException(String response) {
+    public ParseException(@NonNull String response) {
         super(response);
         this.response = response;
     }
+
+    public ParseException(@NonNull String response, @NonNull Throwable cause) {
+        super(response, cause);
+        this.response = response;
+    }
 }