travis: build android apk

.travis.yml

@@ -28,6 +28,7 @@ after_success:
 jobs:
   include:
     - stage: binary builds
+      name: "Windows build"
       sudo: true
       language: c
       python: false
@@ -36,11 +37,26 @@ jobs:
       services:
         - docker
       install:
-        - sudo docker build  --no-cache -t electrum-wine-builder-img ./contrib/build-wine/docker/
+        - sudo docker build --no-cache -t electrum-wine-builder-img ./contrib/build-wine/docker/
       script:
         - sudo docker run --name electrum-wine-builder-cont -v $PWD:/opt/wine64/drive_c/electrum --rm --workdir /opt/wine64/drive_c/electrum/contrib/build-wine electrum-wine-builder-img ./build.sh
       after_success: true
-    - os: osx
+    - name: "Android build"
+      language: python
+      python: 3.7
+      services:
+        - docker
+      install:
+        - ./contrib/make_packages
+        - sudo docker build --no-cache -t electrum-android-builder-img electrum/gui/kivy/tools
+      script:
+        - sudo chown -R 1000:1000 .
+        - sudo docker run -it -u 1000:1000 --rm --name electrum-android-builder-cont -v $PWD:/home/user/wspace/electrum --workdir /home/user/wspace/electrum electrum-android-builder-img ./contrib/make_apk
+        - ls -la bin
+        - if [ $(ls bin | grep -c Electrum-*) -eq 0 ]; then exit 1; fi
+      after_success: true
+    - name: "MacOS build"
+      os: osx
       language: c
       env:
         - TARGET_OS=macOS