diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 060dede..2e76ab3 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -5,10 +5,10 @@
     <uses-permission android:name="android.permission.INTERNET" />
     <application
         android:allowBackup="true"
-        android:icon="@mipmap/ic_launcher"
+        android:icon="@mipmap/ic_logo"
         android:label="@string/app_name"
         android:networkSecurityConfig="@xml/network_security_config"
-        android:roundIcon="@mipmap/ic_launcher_round"
+        android:roundIcon="@mipmap/ic_logo"
         android:supportsRtl="true"
         android:theme="@style/Theme.WKIM"
         android:usesCleartextTraffic="true"
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
deleted file mode 100644
index eca70cf..0000000
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
+++ /dev/null
@@ -1,5 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
-    <background android:drawable="@drawable/ic_launcher_background" />
-    <foreground android:drawable="@drawable/ic_launcher_foreground" />
-</adaptive-icon>
\ No newline at end of file
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
deleted file mode 100644
index eca70cf..0000000
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
+++ /dev/null
@@ -1,5 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
-    <background android:drawable="@drawable/ic_launcher_background" />
-    <foreground android:drawable="@drawable/ic_launcher_foreground" />
-</adaptive-icon>
\ No newline at end of file
diff --git a/app/src/main/res/mipmap-hdpi/ic_launcher.png b/app/src/main/res/mipmap-hdpi/ic_launcher.png
deleted file mode 100644
index a571e60..0000000
Binary files a/app/src/main/res/mipmap-hdpi/ic_launcher.png and /dev/null differ
diff --git a/app/src/main/res/mipmap-hdpi/ic_launcher_round.png b/app/src/main/res/mipmap-hdpi/ic_launcher_round.png
deleted file mode 100644
index 61da551..0000000
Binary files a/app/src/main/res/mipmap-hdpi/ic_launcher_round.png and /dev/null differ
diff --git a/app/src/main/res/mipmap-hdpi/ic_logo.png b/app/src/main/res/mipmap-hdpi/ic_logo.png
new file mode 100644
index 0000000..5066de0
Binary files /dev/null and b/app/src/main/res/mipmap-hdpi/ic_logo.png differ
diff --git a/app/src/main/res/mipmap-mdpi/ic_launcher.png b/app/src/main/res/mipmap-mdpi/ic_launcher.png
deleted file mode 100644
index c41dd28..0000000
Binary files a/app/src/main/res/mipmap-mdpi/ic_launcher.png and /dev/null differ
diff --git a/app/src/main/res/mipmap-mdpi/ic_launcher_round.png b/app/src/main/res/mipmap-mdpi/ic_launcher_round.png
deleted file mode 100644
index db5080a..0000000
Binary files a/app/src/main/res/mipmap-mdpi/ic_launcher_round.png and /dev/null differ
diff --git a/app/src/main/res/mipmap-mdpi/ic_logo.png b/app/src/main/res/mipmap-mdpi/ic_logo.png
new file mode 100644
index 0000000..a944908
Binary files /dev/null and b/app/src/main/res/mipmap-mdpi/ic_logo.png differ
diff --git a/app/src/main/res/mipmap-xhdpi/ic_launcher.png b/app/src/main/res/mipmap-xhdpi/ic_launcher.png
deleted file mode 100644
index 6dba46d..0000000
Binary files a/app/src/main/res/mipmap-xhdpi/ic_launcher.png and /dev/null differ
diff --git a/app/src/main/res/mipmap-xhdpi/ic_launcher_round.png b/app/src/main/res/mipmap-xhdpi/ic_launcher_round.png
deleted file mode 100644
index da31a87..0000000
Binary files a/app/src/main/res/mipmap-xhdpi/ic_launcher_round.png and /dev/null differ
diff --git a/app/src/main/res/mipmap-xhdpi/ic_logo.png b/app/src/main/res/mipmap-xhdpi/ic_logo.png
new file mode 100644
index 0000000..e504c3c
Binary files /dev/null and b/app/src/main/res/mipmap-xhdpi/ic_logo.png differ
diff --git a/app/src/main/res/mipmap-xxhdpi/ic_launcher.png b/app/src/main/res/mipmap-xxhdpi/ic_launcher.png
deleted file mode 100644
index 15ac681..0000000
Binary files a/app/src/main/res/mipmap-xxhdpi/ic_launcher.png and /dev/null differ
diff --git a/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.png b/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.png
deleted file mode 100644
index b216f2d..0000000
Binary files a/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.png and /dev/null differ
diff --git a/app/src/main/res/mipmap-xxhdpi/ic_logo.png b/app/src/main/res/mipmap-xxhdpi/ic_logo.png
new file mode 100644
index 0000000..6f09f36
Binary files /dev/null and b/app/src/main/res/mipmap-xxhdpi/ic_logo.png differ
diff --git a/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png b/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png
deleted file mode 100644
index f25a419..0000000
Binary files a/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png and /dev/null differ
diff --git a/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.png b/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.png
deleted file mode 100644
index e96783c..0000000
Binary files a/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.png and /dev/null differ
diff --git a/app/src/main/res/mipmap-xxxhdpi/ic_logo.png b/app/src/main/res/mipmap-xxxhdpi/ic_logo.png
new file mode 100644
index 0000000..f73d1ec
Binary files /dev/null and b/app/src/main/res/mipmap-xxxhdpi/ic_logo.png differ
diff --git a/wkim/src/main/java/com/xinbida/wukongim/db/MsgDbManager.java b/wkim/src/main/java/com/xinbida/wukongim/db/MsgDbManager.java
index d6f0527..4ef3008 100644
--- a/wkim/src/main/java/com/xinbida/wukongim/db/MsgDbManager.java
+++ b/wkim/src/main/java/com/xinbida/wukongim/db/MsgDbManager.java
@@ -1,14 +1,12 @@
 package com.xinbida.wukongim.db;
 
 import static com.xinbida.wukongim.db.WKDBColumns.TABLE.channel;
-import static com.xinbida.wukongim.db.WKDBColumns.TABLE.channelMembers;
 import static com.xinbida.wukongim.db.WKDBColumns.TABLE.message;
 import static com.xinbida.wukongim.db.WKDBColumns.TABLE.messageExtra;
 
 import android.content.ContentValues;
 import android.database.Cursor;
 import android.text.TextUtils;
-import android.util.Log;
 
 import com.xinbida.wukongim.WKIM;
 import com.xinbida.wukongim.WKIMApplication;
@@ -118,8 +116,6 @@ public class MsgDbManager {
                         int num = getDeletedCount(tempList.get(i).messageSeq, tempList.get(nextIndex).messageSeq, channelId, channelType);
                         if (num < (tempList.get(nextIndex).messageSeq - tempList.get(i).messageSeq) - 1) {
                             isSyncMsg = true;
-//                            syncMaxMsgSeq = tempList.get(nextIndex).messageSeq;
-//                            syncMinMsgSeq = tempList.get(i).messageSeq;
                             long max = tempList.get(nextIndex).messageSeq;
                             long min = tempList.get(i).messageSeq;
                             if (tempList.get(nextIndex).messageSeq < tempList.get(i).messageSeq) {
@@ -134,8 +130,6 @@ public class MsgDbManager {
                                 startMsgSeq = min;
                                 endMsgSeq = max;
                             }
-//                            if (pullMode == 0) reverse = false;//区间大值开始获取
-//                            else reverse = true;//区间小值开始获取
                             break;
                         }
                     }