[enh] Try to compile for OLD Android version (API 19)

config.xml

 <?xml version='1.0' encoding='utf-8'?>
-<widget android-versionCode="106012" id="fr.duniter.cesium" ios-CFBundleIdentifier="org.duniter.cesium" version="1.6.12" xmlns="http://www.w3.org/ns/widgets" xmlns:android="http://schemas.android.com/apk/res/android" xmlns:cdv="http://cordova.apache.org/ns/1.0">
+<widget android-versionCode="106120" id="fr.duniter.cesium" ios-CFBundleIdentifier="org.duniter.cesium" version="1.6.13" xmlns="http://www.w3.org/ns/widgets" xmlns:android="http://schemas.android.com/apk/res/android" xmlns:cdv="http://cordova.apache.org/ns/1.0">
     <name>Cesium</name>
     <description>
     An simple App for Duniter wallet
@@ -58,7 +58,7 @@
     <platform name="android">
         <preference name="AndroidXEnabled" value="true" />
         <preference name="AndroidLaunchMode" value="singleTask" />
-        <preference name="android-minSdkVersion" value="22" />
+        <preference name="android-minSdkVersion" value="19" />
         <preference name="android-targetSdkVersion" value="29" />
         <icon density="ldpi" src="resources/android/icon/drawable-ldpi-icon.png" />
         <icon density="mdpi" src="resources/android/icon/drawable-mdpi-icon.png" />

package.json

@@ -89,11 +89,11 @@
   },
   "devDependencies": {
     "@ionic/cli": "^6.12.3",
-    "@ionic/v1-toolkit": "^3.2.15",
+    "@ionic/v1-toolkit": "3.2.15",
     "@prantlf/gulp-jsonlint": "^2.4.0",
     "ansi-colors": "^4.1.1",
     "cordova": "^10.0.0",
-    "cordova-android": "^9.0.0",
+    "cordova-android": "9.0.0",
     "cordova-clipboard": "^1.3.0",
     "cordova-ios": "^6.1.1",
     "cordova-osx": "^6.0.0",

scripts/env-android.sh

@@ -9,6 +9,8 @@ export PROJECT_DIR
 # Preparing environment
 . "${PROJECT_DIR}/scripts/env-global.sh"
 
+BUILD_TOOLS_DIR="${ANDROID_SDK_ROOT}/build-tools/${ANDROID_SDK_VERSION}/"
+
 if test -z "${CORDOVA_ANDROID_GRADLE_DISTRIBUTION_URL}"; then
   echo "ERROR: Missing Gradle distribution URL - please export env variable 'CORDOVA_ANDROID_GRADLE_DISTRIBUTION_URL'"
 fi
@@ -28,7 +30,7 @@ if test -z "${JAVAC_PATH}"; then
 fi
 
 # Prepare Android SDK tools
-if ! test -d "${ANDROID_SDK_ROOT}/build-tools/${ANDROID_SDK_VERSION}" || ! test -d "${ANDROID_SDK_CLI_ROOT}/tools/bin"; then
+if ! test -d "${BUILD_TOOLS_DIR}" || ! test -d "${ANDROID_SDK_CLI_ROOT}/tools/bin"; then
   . ${PROJECT_DIR}/scripts/install-android-sdk.sh
   if test $? -ne 0; then
     echo "ERROR: Unable to install Android SDK Tools & CLI"
@@ -83,6 +85,11 @@ if test $? -ne 0; then
   echo "ERROR: Check Cordova requirements failed"
 fi
 
-export PATH=${GRADLE_HOME}/bin:${PATH}
+# Add Gradle to path
+PATH=${GRADLE_HOME}/bin:${PATH}
+
+# Export useful variables
+export PATH \
+  BUILD_TOOLS_DIR
 
 echo "Android environment is ready!"

scripts/env-global.sh

@@ -24,7 +24,7 @@ NODEJS_VERSION=12
 #NODE_OPTIONS=--max-old-space-size=4096
 
 ANDROID_NDK_VERSION=19.2.5345600
-ANDROID_SDK_VERSION=29.0.3
+ANDROID_SDK_VERSION=21.1.1
 ANDROID_SDK_CLI_VERSION=6858069
 ANDROID_SDK_ROOT="${HOME}/Android/Sdk"
 ANDROID_ALTERNATIVE_SDK_ROOT=/usr/lib/android-sdk

scripts/install-android-sdk.sh

@@ -45,6 +45,7 @@ echo y | sdkmanager "extras;google;m2repository" "--sdk_root=${ANDROID_SDK_ROOT}
 
 # Install build tools
 echo "Installing Android build-tools..."
+echo y | sdkmanager "build-tools;21.1.1" --sdk_root=${ANDROID_SDK_ROOT}  | tee -a sdkmanager.log
 echo y | sdkmanager "build-tools;${ANDROID_SDK_VERSION}" --sdk_root=${ANDROID_SDK_ROOT}  | tee -a sdkmanager.log
 [[ $? -ne 0 ]] && exit 1
 

scripts/release-android-sign.sh

@@ -7,19 +7,19 @@ if [[ "_" == "_${PROJECT_DIR}" ]]; then
   export PROJECT_DIR
 fi;
 
-# Default env (can be override in file <PROJECT>/.local/env.sh)
+# Default env variables (can be override in '.local/env.sh' file)
 KEYSTORE_FILE=${PROJECT_DIR}/.local/android/Cesium.keystore
 KEY_ALIAS=Cesium
 KEYSTORE_PWD=
-APK_RELEASE_DIR=${PROJECT_DIR}/platforms/android/app/build/outputs/apk/release
-APK_UNSIGNED_FILE=${APK_RELEASE_DIR}/app-release-unsigned.apk
-APK_SIGNED_FILE=${APK_RELEASE_DIR}/app-release.apk
-
 
 # Preparing Android environment
-. ${PROJECT_DIR}/scripts/env-android.sh
+source ${PROJECT_DIR}/scripts/env-android.sh
 [[ $? -ne 0 ]] && exit 1
 
+APK_UNSIGNED_FILE=${ANDROID_OUTPUT_APK_RELEASE}/app-release-unsigned.apk
+APK_SIGNED_FILE=${ANDROID_OUTPUT_APK_RELEASE}/app-release.apk
+
+
 cd ${PROJECT_DIR}
 
 # Sign files

scripts/release-android.sh

@@ -7,10 +7,18 @@ if [[ "_" == "_${PROJECT_DIR}" ]]; then
   export PROJECT_DIR
 fi;
 
+# Default env variables (can be override in '.local/env.sh' file)
+KEYSTORE_FILE=${PROJECT_DIR}/.local/Cesium.keystore
+KEY_ALIAS=Cesium
+KEY_PWD=
+
 # Preparing Android environment
 source ${PROJECT_DIR}/scripts/env-android.sh
 [[ $? -ne 0 ]] && exit 1
 
+APK_UNSIGNED_FILE=${ANDROID_OUTPUT_APK_RELEASE}/app-release-unsigned.apk
+APK_SIGNED_FILE=${ANDROID_OUTPUT_APK_RELEASE}/app-release.apk
+
 cd ${PROJECT_DIR}
 
 # Run the build
@@ -18,13 +26,6 @@ echo "Running cordova build..."
 ionic cordova build android --warning-mode=none --color --prod --release
 [[ $? -ne 0 ]] && exit 1
 
-# Signature
-KEYSTORE_FILE=${PROJECT_DIR}/.local/Cesium.keystore
-KEY_ALIAS=Cesium
-KEY_PWD=
-APK_DIR=${PROJECT_DIR}/platforms/android/build/outputs/apk/release
-APK_UNSIGNED_FILE=${APK_DIR}/android-release.apk
-BUILD_TOOLS_DIR="${ANDROID_SDK_ROOT}/build-tools/28.*/"
 
 if [[ ! -f "${APK_UNSIGNED_FILE}" ]]; then
   echo "APK file not found at: ${APK_UNSIGNED_FILE}"
@@ -48,7 +49,7 @@ if [[ $? -ne 0 ]]; then
 
   jarsigner -verbose -sigalg SHA1withRSA -digestalg SHA1 -keystore ${KEYSTORE_FILE} ${APK_UNSIGNED_FILE} Cesium
 
-  BUILD_TOOLS_DIR="${ANDROID_SDK_ROOT}/build-tools/28.*/"
+  BUILD_TOOLS_DIR="${ANDROID_SDK_ROOT}/build-tools/${ANDROID_SDK_VERSION}/"
   cd ${BUILD_TOOLS_DIR}
   ./zipalign -v 4 ${APK_UNSIGNED_FILE} ${APK_SIGNED_FILE}