重构了 main.py 代码

build.gradle

@@ -0,0 +1,38 @@
+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+
+buildscript {
+
+    repositories {
+        google()
+        jcenter()
+    }
+    dependencies {
+        classpath 'com.android.tools.build:gradle:3.4.2'
+
+        // NOTE: Do not place your application dependencies here; they belong
+        // in the individual module build.gradle files
+    }
+}
+
+plugins {
+    id "com.jfrog.bintray" version "1.7.3"
+    id "com.github.dcendents.android-maven" version "2.0"
+}
+
+allprojects {
+    repositories {
+        google()
+        jcenter()
+    }
+}
+
+ext {
+    compileSdkVersion = 28
+    minSdkVersion = 16
+    targetSdkVersion = 28
+    supportLibraryVersion = '28.0.0'
+    playServicesVersion = '16.0.0'
+    espressoVersion = '3.0.2'
+    junitVersion = '4.12'
+    runnerVersion = '1.0.2'
+}