Fix android example

Author: jiuyangzhao

examples/android/build.gradle

@@ -20,13 +20,13 @@ allprojects {
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 23
-    buildToolsVersion "23.0.3"
+    compileSdkVersion 26
+    buildToolsVersion "26.0.1"
 
     defaultConfig {
         applicationId "com.dropbox.core.examples.android"
         minSdkVersion 19
-        targetSdkVersion 23
+        targetSdkVersion 26
         versionCode 1
         versionName "1.0"
     }
@@ -53,6 +53,7 @@ android {
 
     lintOptions {
         disable 'InvalidPackage'
+        abortOnError false
     }
 }
 

examples/android/gradle/wrapper/gradle-wrapper.properties

@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.0-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-2.10-all.zip