update platforms/android/build.gradle.

修改云源

platforms/android/build.gradle

@@ -22,7 +22,7 @@ buildscript {
     repositories {
         google()
         jcenter()
-        maven{ url 'https://maven.aliyun.com/repository/google' }
+  maven{ url 'https://maven.aliyun.com/repository/google' }
     }
 
     dependencies {
@@ -33,9 +33,15 @@ buildscript {
     }
 }
 
+configurations.all {
+  resolutionStrategy {
+      force 'com.android.support:support-v4:27.1.0'
+  }
+}
 allprojects {
     repositories {
         google()
+        maven{ url 'https://maven.aliyun.com/repository/google' }
         jcenter()
     }