diff --git a/README.md b/README.md
index 85522f6..0425c1a 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@
 ##
 **游戏已经在华为、小米等手机上测试通过，同时也支持各种机型，欢迎下载：[点击下载](https://fir.im/an5s)**
 
-若以上链接失效，请戳这里：[apk下载](https://github.com/HurTeng/StormPlane/raw/master/app/app-release.apk)
+若以上链接失效，请戳这里：[apk下载](https://github.com/HurTeng/StormPlane/raw/master/app/release/app-release.apk)
 
 
 # 游戏说明
diff --git a/app/app-release.apk b/app/release/app-release.apk
similarity index 88%
rename from app/app-release.apk
rename to app/release/app-release.apk
index 6f50e94..9bb51d5 100644
Binary files a/app/app-release.apk and b/app/release/app-release.apk differ
diff --git a/app/release/output.json b/app/release/output.json
new file mode 100644
index 0000000..3650c8b
--- /dev/null
+++ b/app/release/output.json
@@ -0,0 +1 @@
+[{"outputType":{"type":"APK"},"apkInfo":{"type":"MAIN","splits":[],"versionCode":1},"path":"app-release.apk","properties":{"packageId":"com.hurteng.stormplane","split":"","minSdkVersion":"16"}}]
\ No newline at end of file
diff --git a/app/src/main/java/com/hurteng/stormplane/constant/ConstantUtil.java b/app/src/main/java/com/hurteng/stormplane/constant/ConstantUtil.java
index 805c2d1..bddfa59 100644
--- a/app/src/main/java/com/hurteng/stormplane/constant/ConstantUtil.java
+++ b/app/src/main/java/com/hurteng/stormplane/constant/ConstantUtil.java
@@ -1,30 +1,30 @@
 package com.hurteng.stormplane.constant;
 
-public class ConstantUtil {
-	// 物品的方向常量
-	public static int DIR_LEFT_UP = 1;
-	public static int DIR_RIGHT_UP = 2;
-	public static int DIR_LEFT_DOWN = 3;
-	public static int DIR_RIGHT_DOWN = 4;
-	public static int DIR_LEFT = 5;
-	public static int DIR_RIGHT = 6;
-	public static int TO_MAIN_VIEW = 7;
-	public static int TO_END_VIEW = 8;
-	public static int END_GAME = 9;
+public interface ConstantUtil {
+    // 物品的方向常量
+    int DIR_LEFT_UP = 1;
+    int DIR_RIGHT_UP = 2;
+    int DIR_LEFT_DOWN = 3;
+    int DIR_RIGHT_DOWN = 4;
+    int DIR_LEFT = 5;
+    int DIR_RIGHT = 6;
+    int TO_MAIN_VIEW = 7;
+    int TO_END_VIEW = 8;
+    int END_GAME = 9;
+
+    int DIR_UP = 10;
+    int DIR_DOWN = 11;
+    int DIR_TEMP = 12;
+
+    // 我方子弹类型
+    int MYBULLET = 100;
+    int MYBULLET1 = 101;
+    int MYBULLET2 = 102;
+
+    // boss子弹类型
+    int BOSSBULLET_DEFAULT = 110;
+    int BOSSBULLET_ANGER = 111;
+    int BOSSBULLET_CRAZY = 112;
+    int BOSSBULLET_LIMIT = 113;
 
-	public static final int DIR_UP = 10;
-	public static final int DIR_DOWN = 11;
-	public static final int DIR_TEMP = 12;
-	
-	//我方子弹类型
-	public static int MYBULLET = 100;
-	public static int MYBULLET1 = 101;
-	public static int MYBULLET2 = 102;
-	
-	//boss子弹类型
-	public static int BOSSBULLET_DEFAULT = 110;
-	public static int BOSSBULLET_ANGER = 111;
-	public static int BOSSBULLET_CRAZY = 112;
-	public static int BOSSBULLET_LIMIT = 113;
-	
 }