升级gradle

android_crop_lib/build.gradle

@@ -1,4 +1,5 @@
 apply plugin: 'com.android.library'
+apply plugin: 'kotlin-android'
 
 android {
     compileSdkVersion 29
@@ -24,5 +25,10 @@ android {
 dependencies {
     api 'androidx.annotation:annotation:1.1.0'
     api 'androidx.legacy:legacy-support-v4:1.0.0'
+    implementation "androidx.core:core-ktx:+"
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+}
+repositories {
+    mavenCentral()
 }