Change the default character encoding for JSON responses to UTF-8

According to RFC 7159 (Section 8.1), the default encoding of JSON should be UTF-8.
Using ISO-8859-1 as default causes incompatibility with some JSON APIs (e.g. wrong interpretation of internationalized strings).

4 files changed, 22 insertions, 10 deletions

diff --git a/src/main/java/com/android/volley/toolbox/HttpHeaderParser.java b/src/main/java/com/android/volley/toolbox/HttpHeaderParser.java
index cb08432..601ac0f 100644
--- a/src/main/java/com/android/volley/toolbox/HttpHeaderParser.java
+++ b/src/main/java/com/android/volley/toolbox/HttpHeaderParser.java
@@ -115,10 +115,14 @@ public class HttpHeaderParser {
     }
 
     /**
-     * Returns the charset specified in the Content-Type of this header,
-     * or the HTTP default (ISO-8859-1) if none can be found.
+     * Retrieve a charset from headers
+     *
+     * @param headers An {@link java.util.Map} of headers
+     * @param defaultCharset Charset to return if none can be found
+     * @return Returns the charset specified in the Content-Type of this header,
+     * or the defaultCharset if none can be found.
      */
-    public static String parseCharset(Map<String, String> headers) {
+    public static String parseCharset(Map<String, String> headers, String defaultCharset) {
         String contentType = headers.get(HTTP.CONTENT_TYPE);
         if (contentType != null) {
             String[] params = contentType.split(";");
@@ -132,6 +136,14 @@ public class HttpHeaderParser {
             }
         }
 
-        return HTTP.DEFAULT_CONTENT_CHARSET;
+        return defaultCharset;
+    }
+
+    /**
+     * Returns the charset specified in the Content-Type of this header,
+     * or the HTTP default (ISO-8859-1) if none can be found.
+     */
+    public static String parseCharset(Map<String, String> headers) {
+        return parseCharset(headers, HTTP.DEFAULT_CONTENT_CHARSET);
     }
 }
diff --git a/src/main/java/com/android/volley/toolbox/JsonArrayRequest.java b/src/main/java/com/android/volley/toolbox/JsonArrayRequest.java
index b1eae80..e932a61 100644
--- a/src/main/java/com/android/volley/toolbox/JsonArrayRequest.java
+++ b/src/main/java/com/android/volley/toolbox/JsonArrayRequest.java
@@ -45,8 +45,8 @@ public class JsonArrayRequest extends JsonRequest<JSONArray> {
     @Override
     protected Response<JSONArray> parseNetworkResponse(NetworkResponse response) {
         try {
-            String jsonString =
-                new String(response.data, HttpHeaderParser.parseCharset(response.headers));
+            String jsonString = new String(response.data,
+                    HttpHeaderParser.parseCharset(response.headers, PROTOCOL_CHARSET));
             return Response.success(new JSONArray(jsonString),
                     HttpHeaderParser.parseCacheHeaders(response));
         } catch (UnsupportedEncodingException e) {
diff --git a/src/main/java/com/android/volley/toolbox/JsonObjectRequest.java b/src/main/java/com/android/volley/toolbox/JsonObjectRequest.java
index 74821cb..2991898 100644
--- a/src/main/java/com/android/volley/toolbox/JsonObjectRequest.java
+++ b/src/main/java/com/android/volley/toolbox/JsonObjectRequest.java
@@ -63,8 +63,8 @@ public class JsonObjectRequest extends JsonRequest<JSONObject> {
     @Override
     protected Response<JSONObject> parseNetworkResponse(NetworkResponse response) {
         try {
-            String jsonString =
-                new String(response.data, HttpHeaderParser.parseCharset(response.headers));
+            String jsonString = new String(response.data,
+                    HttpHeaderParser.parseCharset(response.headers, PROTOCOL_CHARSET));
             return Response.success(new JSONObject(jsonString),
                     HttpHeaderParser.parseCacheHeaders(response));
         } catch (UnsupportedEncodingException e) {
diff --git a/src/main/java/com/android/volley/toolbox/JsonRequest.java b/src/main/java/com/android/volley/toolbox/JsonRequest.java
index f11ac14..95f4ecb 100644
--- a/src/main/java/com/android/volley/toolbox/JsonRequest.java
+++ b/src/main/java/com/android/volley/toolbox/JsonRequest.java
@@ -32,8 +32,8 @@ import java.io.UnsupportedEncodingException;
  * @param <T> JSON type of response expected
  */
 public abstract class JsonRequest<T> extends Request<T> {
-    /** Charset for request. */
-    private static final String PROTOCOL_CHARSET = "utf-8";
+    /** Default charset for JSON request. */
+    protected static final String PROTOCOL_CHARSET = "utf-8";
 
     /** Content type for request. */
     private static final String PROTOCOL_CONTENT_TYPE =