gethistoryMessages: add isDescend

Author: huangminlinux

android/src/main/java/com/jiguang/jmessageflutter/JmessageFlutterPlugin.java

@@ -25,6 +25,7 @@
 import java.io.FileNotFoundException;
 import java.lang.reflect.Method;
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.List;
@@ -1106,7 +1107,7 @@ private void getHistoryMessages(MethodCall call, Result result) {
     HashMap<String, Object> map = call.arguments();
     Conversation conversation;
     int from, limit;
-
+    boolean isDescend;
     try {
       JSONObject params = new JSONObject(map);
 
@@ -1116,6 +1117,8 @@ private void getHistoryMessages(MethodCall call, Result result) {
         return;
       }
 
+      isDescend = params.has("isDescend") ? params.getBoolean("isDescend") : false;
+
       from = params.getInt("from");
       limit = params.getInt("limit");
 
@@ -1143,6 +1146,10 @@ private void getHistoryMessages(MethodCall call, Result result) {
       messageList = conversation.getMessagesFromNewest(from, limit);
     }
 
+    if (!isDescend) {
+      Collections.reverse(messageList);
+    }
+
     ArrayList messageJSONArr = new ArrayList();
 
     for (Message msg : messageList) {

lib/jmessage_flutter.dart

@@ -614,12 +614,14 @@ class JmessageFlutter {
     @required dynamic type, /// (JMSingle | JMGroup)
     @required int from,
     @required int limit,
+    bool isDescend = false
   }) async {
     Map param = type.toJson();
 
     param..addAll({
       'from': from,
       'limit': limit,
+      'isDescend': isDescend
       });
 
     List resArr = await _channel.invokeMethod('getHistoryMessages', 
@@ -2120,11 +2122,13 @@ class JMConversationInfo {
   Future<List> getHistoryMessages({
     @required int from,
     @required int limit,
+    bool isDescend = false
   }) async {
     List msgs = await JmessageFlutter().getHistoryMessages(
       type: target.targetType,
       from: from,
-      limit: limit
+      limit: limit,
+      isDescend: isDescend
     );
     return msgs;
   }