用注解实现回调

AriaAnnotations/build.gradle

@@ -0,0 +1,12 @@
+apply plugin: 'java'
+
+tasks.withType(JavaCompile) {
+  options.encoding = "UTF-8"
+}
+
+dependencies {
+  compile fileTree(dir: 'libs', include: ['*.jar'])
+
+  sourceCompatibility = "1.7"
+  targetCompatibility = "1.7"
+}