refactor(download): 重构下载模块代码格式和逻辑实现

- 格式化 ChildHandleDialog 类代码缩进和空行
- 优化 ChildHandleDialog 中的 onClick 方法使用 if-else 替代 switch
- 格式化 M3U8LiveDLoadActivity 类代码缩进和空行
- 优化 M3U8LiveDLoadActivity 中的菜单点击事件处理逻辑
- 格式化 M3U8VodDLoadActivity 类代码缩进和空行
- 添加必要的 import 语句和空行分隔
- 统一代码风格和提高可读性

AriaCompiler/build.gradle

@@ -1,22 +1,22 @@
 apply plugin: 'java'
 
 tasks.withType(JavaCompile) {
-  options.encoding = "UTF-8"
+    options.encoding = "UTF-8"
 }
-sourceCompatibility = JavaVersion.VERSION_1_7
-targetCompatibility = JavaVersion.VERSION_1_7
+sourceCompatibility = JavaVersion.VERSION_1_8
+targetCompatibility = JavaVersion.VERSION_1_8
 
 dependencies {
-  implementation fileTree(include: ['*.jar'], dir: 'libs')
-  implementation 'com.google.auto:auto-common:0.10'
-  implementation 'com.google.auto.service:auto-service:1.0-rc6'
-  annotationProcessor 'com.google.auto.service:auto-service:1.0-rc6'
-  implementation 'com.squareup:javapoet:1.9.0'
-  implementation project(':AriaAnnotations')
+    implementation fileTree(include: ['*.jar'], dir: 'libs')
+    implementation 'com.google.auto:auto-common:0.10'
+    implementation 'com.google.auto.service:auto-service:1.0-rc6'
+    annotationProcessor 'com.google.auto.service:auto-service:1.0-rc6'
+    implementation 'com.squareup:javapoet:1.9.0'
+    implementation project(':AriaAnnotations')
 }
 
 //apply from: 'bintray-release.gradle'
-ext{
-  PUBLISH_ARTIFACT_ID = 'compiler'
+ext {
+    PUBLISH_ARTIFACT_ID = 'compiler'
 }
 apply from: '../gradle/mavenCentral-release.gradle'