see 03/23 log

.travis.yml

@@ -18,7 +18,7 @@ android:
     email: false
 
 before_install:
-    - yes | /usr/local/android-sdk/tools/bin/sdkmanager "build-tools;26.0.2"
+    - yes | $ANDROID_HOME/tools/bin/sdkmanager --licenses
 
 script:
   - ./gradlew build connectedCheck --info

utilcode/src/test/java/com/blankj/utilcode/util/EncryptUtilsTest.java

@@ -22,7 +22,7 @@ import static org.junit.Assert.assertTrue;
  * </pre>
  */
 @RunWith(RobolectricTestRunner.class)
-@Config(manifest = Config.NONE)
+@Config(manifest = Config.NONE, sdk = 23)
 public class EncryptUtilsTest {
 
     static {

utilcode/src/test/java/com/blankj/utilcode/util/ObjectUtilsTest.java

@@ -27,7 +27,7 @@ import static org.junit.Assert.assertTrue;
  * </pre>
  */
 @RunWith(RobolectricTestRunner.class)
-@Config(manifest = Config.NONE)
+@Config(manifest = Config.NONE, sdk = 23)
 public class ObjectUtilsTest {
 
     @Test