Fix android build and enable snapshots

Summary:
Fix some long-standing issues with the android build on Travis (and elsewhere)
and enable automatic publishing of snapshots.

Reviewed By: emilsjolander

Differential Revision: D5044001

fbshipit-source-id: f00be07f33c8018573af0b98233068ebd93360b4

scripts/android-setup.sh

@@ -0,0 +1,37 @@
+function download() {
+  if hash curl 2>/dev/null; then
+    curl -L -o $2 $1
+  elif hash wget 2>/dev/null; then
+    wget -O $2 $1
+  else
+    echo >&2 "No supported download tool installed. Please get either wget or curl."
+    exit
+  fi
+}
+
+function installsdk() {
+  PROXY_ARGS=""
+  if [[ ! -z "$https_proxy" ]]; then
+    PROXY_HOST="$(cut -d : "$https_proxy" -f 1,1)"
+    PROXY_PORT="$(cut -d : "$https_proxy" -f 2,2)"
+    PROXY_ARGS="--proxy=http --proxy_host=$PROXY_HOST --proxy_port=$PROXY_PORT"
+  fi
+
+  yes | $ANDROID_HOME/tools/bin/sdkmanager $PROXY_ARGS $@
+}
+
+function installAndroidSDK {
+  TMP=/tmp/sdk$$.zip
+  download 'https://dl.google.com/android/repository/tools_r25.2.3-linux.zip' $TMP
+  unzip -d $HOME/android-sdk $TMP
+  rm $TMP
+
+  export ANDROID_HOME=$HOME/android-sdk
+  export PATH="$ANDROID_HOME/platform-tools:$ANDROID_HOME/tools:$ANDROID_HOME/tools/bin:$PATH"
+
+  mkdir -p $ANDROID_HOME/licenses/
+  echo > $ANDROID_HOME/licenses/android-sdk-license
+  echo -n 8933bad161af4178b1185d1a37fbf41ea5269c55 > $ANDROID_HOME/licenses/android-sdk-license
+
+  installsdk 'build-tools;23.0.2' 'build-tools;25.0.2' 'build-tools;25.0.1' 'platforms;android-23' 'platforms;android-25' 'ndk-bundle' 'extras;android;m2repository'
+}