diff --git a/app/build.gradle b/app/build.gradle
index e655a4f..63e84e7 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -7,7 +7,7 @@ android {
         minSdkVersion 21
         targetSdkVersion 29
         versionCode 1
-        versionName "1.0.0"
+        versionName "1.1.0"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
     buildTypes {
@@ -39,16 +39,16 @@ android {
 dependencies {
     implementation fileTree(include: ['*.jar'], dir: 'libs')
     implementation 'androidx.appcompat:appcompat:1.2.0'
-    implementation 'com.google.android.material:material:1.2.1'
     implementation 'androidx.constraintlayout:constraintlayout:2.0.1'
     implementation 'androidx.preference:preference:1.1.1'
-    testImplementation 'junit:junit:4.12'
+    implementation 'androidx.cardview:cardview:1.0.0'
+    implementation 'com.google.android.material:material:1.2.1'
+    implementation 'com.android.volley:volley:1.1.1'
+    testImplementation 'junit:junit:4.13'
     androidTestImplementation 'androidx.test:runner:1.3.0'
-    androidTestImplementation('androidx.test.espresso:espresso-core:3.1.0', {
+    androidTestImplementation('androidx.test.espresso:espresso-core:3.2.0', {
         exclude group: 'com.android.support', module: 'support-annotations'
     })
     implementation files('libs/BaiduLBS_Android.jar')
-    implementation files('libs/Volley-1.0.19.jar')
-    implementation 'androidx.cardview:cardview:1.0.0'
     implementation files('libs/log4j-1.2.17.jar')
 }
diff --git a/app/libs/Volley-1.0.19.jar b/app/libs/Volley-1.0.19.jar
deleted file mode 100644
index fbcc9d0..0000000
Binary files a/app/libs/Volley-1.0.19.jar and /dev/null differ
diff --git a/app/release/app-release.apk b/app/release/app-release.apk
index 117e316..9a0db6b 100644
Binary files a/app/release/app-release.apk and b/app/release/app-release.apk differ
diff --git a/app/release/output.json b/app/release/output.json
index a7b1e07..218e0c7 100644
--- a/app/release/output.json
+++ b/app/release/output.json
@@ -1 +1 @@
-[{"outputType":{"type":"APK"},"apkInfo":{"type":"MAIN","splits":[],"versionCode":1,"versionName":"1.0.0","enabled":true,"outputFile":"app-release.apk","fullName":"release","baseName":"release"},"path":"app-release.apk","properties":{}}]
\ No newline at end of file
+[{"outputType":{"type":"APK"},"apkInfo":{"type":"MAIN","splits":[],"versionCode":1,"versionName":"1.1.0","enabled":true,"outputFile":"app-release.apk","fullName":"release","baseName":"release"},"path":"app-release.apk","properties":{}}]
\ No newline at end of file
diff --git a/app/src/main/java/com/zcshou/gogogo/WelcomeActivity.java b/app/src/main/java/com/zcshou/gogogo/WelcomeActivity.java
index 3191092..7d476d7 100644
--- a/app/src/main/java/com/zcshou/gogogo/WelcomeActivity.java
+++ b/app/src/main/java/com/zcshou/gogogo/WelcomeActivity.java
@@ -12,10 +12,8 @@ import androidx.annotation.NonNull;
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.preference.PreferenceManager;
 
-import android.view.Gravity;
 import android.view.View;
 import android.widget.Button;
-import android.widget.Toast;
 
 import java.util.ArrayList;
 import java.util.Locale;
diff --git a/app/src/main/java/com/zcshou/joystick/JoyStick.java b/app/src/main/java/com/zcshou/joystick/JoyStick.java
index c473a06..8a7dcb0 100644
--- a/app/src/main/java/com/zcshou/joystick/JoyStick.java
+++ b/app/src/main/java/com/zcshou/joystick/JoyStick.java
@@ -1,9 +1,7 @@
 package com.zcshou.joystick;
 
 import android.annotation.SuppressLint;
-import android.app.Service;
 import android.content.Context;
-import android.content.SharedPreferences;
 import android.graphics.PixelFormat;
 import android.os.Build;
 import android.os.CountDownTimer;
@@ -17,9 +15,6 @@ import android.view.WindowManager;
 import android.widget.Button;
 import android.widget.ImageButton;
 import android.widget.LinearLayout;
-import android.widget.Toast;
-
-import androidx.preference.PreferenceManager;
 
 import com.zcshou.gogogo.R;
 
@@ -28,7 +23,7 @@ public class JoyStick extends View {
     private Context mContext;
     private WindowManager.LayoutParams mWindowParams;
     private WindowManager mWindowManager;
-    private LayoutInflater inflater;
+    private final LayoutInflater inflater;
     private View mJoystickView;
     private LinearLayout mLatLngView;
     private JoyStickClickListener mListener;
@@ -228,7 +223,7 @@ public class JoyStick extends View {
         });
     }
 
-    @SuppressLint("InflateParams")
+    @SuppressLint({"InflateParams", "ClickableViewAccessibility"})
     private void initJoyStickLatLngView() {
         mLatLngView = (LinearLayout)inflater.inflate(R.layout.joystick_latlng, null);
         mLatLngView.setOnTouchListener(new JoyStickOnTouchListener());