fix bugs

android/build.gradle

@@ -3,25 +3,27 @@ version '1.0-SNAPSHOT'
 
 buildscript {
     repositories {
+        google()
         jcenter()
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.3.0'
+        classpath 'com.android.tools.build:gradle:3.5.3'
     }
 }
 
 allprojects {
     repositories {
+        google()
         jcenter()
     }
 }
 
 apply plugin: 'com.android.library'
 
 android {
-    compileSdkVersion 25
-    buildToolsVersion '25.0.3'
+    compileSdkVersion 28
+    buildToolsVersion '28.0.3'
 
     defaultConfig {
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

android/gradle.properties

@@ -1 +1,2 @@
 org.gradle.jvmargs=-Xmx1536M
+android.enableR8=true

example/.flutter-plugins-dependencies

@@ -0,0 +1 @@
+{"_info":"// This is a generated file; do not edit or check into version control.","dependencyGraph":[{"name":"audioplayer","dependencies":[]},{"name":"path_provider","dependencies":[]}]}

example/ios/Flutter/flutter_export_environment.sh

@@ -0,0 +1,10 @@
+#!/bin/sh
+# This is a generated file; do not edit or check into version control.
+export "FLUTTER_ROOT=/Users/tian/Documents/work/sdks/flutter"
+export "FLUTTER_APPLICATION_PATH=/Users/tian/Documents/work/flutter/audioplayer/example"
+export "FLUTTER_TARGET=lib/main.dart"
+export "FLUTTER_BUILD_DIR=build"
+export "SYMROOT=${SOURCE_ROOT}/../build/ios"
+export "FLUTTER_FRAMEWORK_DIR=/Users/tian/Documents/work/sdks/flutter/bin/cache/artifacts/engine/ios"
+export "FLUTTER_BUILD_NAME=2.0.0"
+export "FLUTTER_BUILD_NUMBER=2.0.0"