diff --git a/app/src/main/java/com/gh/gamecenter/SplashScreenActivity.java b/app/src/main/java/com/gh/gamecenter/SplashScreenActivity.java
index 02bb6d885d..f98981868e 100644
--- a/app/src/main/java/com/gh/gamecenter/SplashScreenActivity.java
+++ b/app/src/main/java/com/gh/gamecenter/SplashScreenActivity.java
@@ -8,6 +8,7 @@ import android.net.Uri;
 import android.os.Bundle;
 import android.preference.PreferenceManager;
 import android.provider.Settings;
+import android.support.annotation.NonNull;
 import android.support.v4.app.ActivityCompat;
 import android.support.v4.content.ContextCompat;
 import android.support.v4.view.PagerAdapter;
@@ -116,7 +117,7 @@ public class SplashScreenActivity extends BaseActivity {
 
         if (isNewFirstLaunch) {
             mContentView.setPadding(0, 0, 0, 0);
-            ViewPager guideLayout = (ViewPager) findViewById(R.id.splash_intro_vp_guide);
+            ViewPager guideLayout = findViewById(R.id.splash_intro_vp_guide);
             guideLayout.setAdapter(new GuidePagerAdapter());
         }
 
@@ -204,12 +205,7 @@ public class SplashScreenActivity extends BaseActivity {
                 if (!isNewFirstLaunch) {
                     long end = System.currentTimeMillis() - start;
                     if (end < 2000) {
-                        getWindow().getDecorView().postDelayed(new Runnable() {
-                            @Override
-                            public void run() {
-                                launch();
-                            }
-                        }, 2000 - end);
+                        getWindow().getDecorView().postDelayed(this::launch, 2000 - end);
                     } else {
                         launch();
                     }
@@ -234,33 +230,15 @@ public class SplashScreenActivity extends BaseActivity {
         if (EasyPermissions.somePermissionPermanentlyDenied(this, perms)) { // 设置"不要再询问",必须手动到系统设置授权
             DialogUtils.showPermissionDialog(this, "重要提醒",
                     "请授予光环助手权限,否则将无法使用\n请点击\"设置\"-\"应用\"-\"光环助手\"-\"权限\"-打开所需权限", "去设置", "退出",
-                    new DialogUtils.ConfirmListener() {
-                        @Override
-                        public void onConfirm() {
-                            Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
-                            intent.setData(Uri.parse("package:" + getPackageName()));
-                            startActivity(intent);
-                        }
-                    }, new DialogUtils.CancelListener() {
-                        @Override
-                        public void onCancel() {
-                            finish();
-                        }
-                    });
+                    () -> {
+                        Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
+                        intent.setData(Uri.parse("package:" + getPackageName()));
+                        startActivity(intent);
+                    }, this::finish);
         } else {
             DialogUtils.showPermissionDialog(this, "重要提醒",
                     "请授予光环助手权限,否则将无法使用", "重试", "退出",
-                    new DialogUtils.ConfirmListener() {
-                        @Override
-                        public void onConfirm() {
-                            checkAndRequestPermission();
-                        }
-                    }, new DialogUtils.CancelListener() {
-                        @Override
-                        public void onCancel() {
-                            finish();
-                        }
-                    });
+                    this::checkAndRequestPermission, this::finish);
         }
     }
 
@@ -293,19 +271,17 @@ public class SplashScreenActivity extends BaseActivity {
             return mPics.length;
         }
 
+        @NonNull
         @Override
-        public Object instantiateItem(ViewGroup container, int position) {
+        public Object instantiateItem(@NonNull ViewGroup container, int position) {
             View view = View.inflate(container.getContext(), R.layout.splash_guide_item, null);
-            ImageView ivImage = (ImageView) view.findViewById(R.id.splsh_guide_iv_image);
+            ImageView ivImage = view.findViewById(R.id.splsh_guide_iv_image);
             ivImage.setImageResource(mPics[position]);
             if (position == mPics.length - 1) {
-                TextView tvSkip = (TextView) view.findViewById(R.id.splsh_guide_tv_skip);
-                tvSkip.setOnClickListener(new View.OnClickListener() {
-                    @Override
-                    public void onClick(View v) {
-                        if (EasyPermissions.hasPermissions(SplashScreenActivity.this, mPermissions)) {
-                            launch();
-                        }
+                TextView tvSkip = view.findViewById(R.id.splsh_guide_tv_skip);
+                tvSkip.setOnClickListener(v -> {
+                    if (EasyPermissions.hasPermissions(SplashScreenActivity.this, mPermissions)) {
+                        launch();
                     }
                 });
 
@@ -315,12 +291,12 @@ public class SplashScreenActivity extends BaseActivity {
         }
 
         @Override
-        public void destroyItem(ViewGroup container, int position, Object object) {
+        public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
             container.removeView((View) object);
         }
 
         @Override
-        public boolean isViewFromObject(View view, Object object) {
+        public boolean isViewFromObject(@NonNull View view, @NonNull Object object) {
             return view == object;
         }
 
diff --git a/dependencies.gradle b/dependencies.gradle
index 798a2ecc43..04ada3401c 100644
--- a/dependencies.gradle
+++ b/dependencies.gradle
@@ -4,7 +4,7 @@ ext {
     compileSdkVersion = 27
     minSdkVersion = 14
     // TODO fix permission/ target 23 will cause permission issues
-    targetSdkVersion = 22
+    targetSdkVersion = 27
 
     // application info
     versionCode = 25
@@ -21,8 +21,6 @@ ext {
     eventbusApt = "3.0.1"
 
     // rxJava & rxAndroid
-    rxJava = "1.1.0"
-    rxAndroid = "1.2.1"
     rxBinding = "0.3.0"
 
     rxJava2 = "2.1.8"
diff --git a/libraries/MTA/libs/mid-sdk-3.73.jar b/libraries/MTA/libs/mid-sdk-3.73.jar
deleted file mode 100644
index b74b1b2973..0000000000
Binary files a/libraries/MTA/libs/mid-sdk-3.73.jar and /dev/null differ
diff --git a/libraries/MTA/libs/mid-sdk-4.06.jar b/libraries/MTA/libs/mid-sdk-4.06.jar
new file mode 100644
index 0000000000..9db98e295b
Binary files /dev/null and b/libraries/MTA/libs/mid-sdk-4.06.jar differ
diff --git a/libraries/MTA/libs/mta-android-sdk-3.3.1.jar b/libraries/MTA/libs/mta-android-sdk-3.3.1.jar
deleted file mode 100644
index 1632402cd6..0000000000
Binary files a/libraries/MTA/libs/mta-android-sdk-3.3.1.jar and /dev/null differ
diff --git a/libraries/MTA/libs/mta-android-sdk-3.4.7.jar b/libraries/MTA/libs/mta-android-sdk-3.4.7.jar
new file mode 100644
index 0000000000..6f7b1dced8
Binary files /dev/null and b/libraries/MTA/libs/mta-android-sdk-3.4.7.jar differ