Fix Travis CI

.travis.yml

@@ -1,7 +1,28 @@
 language: android
-dist: trusty
+
+jdk: oraclejdk8
+
+env:
+  global:
+    - ANDROID_TARGET=android-22
+    - ANDROID_ABI=armeabi-v7a
+
 android:
   components:
-    - build-tools-26.0.2
-    - android-26
-    - extra
+  - tools
+  - platform-tools
+  - build-tools-28.0.3
+  - android-28
+  - $ANDROID_TARGET
+  - extra-android-m2repository
+  - sys-img-${ANDROID_ABI}-${ANDROID_TARGET}
+
+before_script:
+  - echo no | android create avd --force -n test -t $ANDROID_TARGET --abi $ANDROID_ABI -c 100M
+  - emulator -avd test -no-window &
+  - bash ./tools/android-wait-for-emulator.sh
+  - adb shell input keyevent 82 &
+
+script:
+  - bash ./gradlew build
+  - bash ./gradlew test -x lint --stacktrace

tools/android-wait-for-emulator.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+
+# Originally written by Ralf Kistner <ralf@embarkmobile.com>, but placed in the public domain
+
+set +e
+
+bootanim=""
+failcounter=0
+timeout_in_sec=360
+
+until [[ "$bootanim" =~ "stopped" ]]; do
+  bootanim=`adb -e shell getprop init.svc.bootanim 2>&1 &`
+  if [[ "$bootanim" =~ "device not found" || "$bootanim" =~ "device offline"
+    || "$bootanim" =~ "running" ]]; then
+    let "failcounter += 1"
+    echo "Waiting for emulator to start"
+    if [[ $failcounter -gt timeout_in_sec ]]; then
+      echo "Timeout ($timeout_in_sec seconds) reached; failed to start emulator"
+      exit 1
+    fi
+  fi
+  sleep 1
+done
+
+echo "Emulator is ready"