[fix] Fix Android compilation

config.xml

@@ -28,7 +28,7 @@
     <preference name="KeyboardResizeMode" value="ionic" />
     <preference name="xwalkVersion" value="19" />
     <preference name="xwalkMultipleApk" value="false" />
-    <preference name="android-minSdkVersion" value="16" />
+    <preference name="android-minSdkVersion" value="20" />
     <preference name="android-targetSdkVersion" value="28" />
     <preference name="StatusBarOverlaysWebView" value="false" />
     <preference name="StatusBarBackgroundColor" value="#000" />

hooks/after_prepare/060_prepare_android_manifest.js

@@ -31,7 +31,7 @@ if (rootdir) {
         .pipe(replace(/<uses-sdk [^>]+\/>/g, ''))
 
         // add <uses-sdk> (replace 'targetSdkversion' and add tools:overrideLibrary)
-        .pipe(replace(/(<\/manifest>)/, '    <uses-sdk android:minSdkVersion="16" android:targetSdkVersion="28" tools:overrideLibrary="org.kaliumjni.lib" />\n$1'))
+        .pipe(replace(/(<\/manifest>)/, '    <uses-sdk android:minSdkVersion="20" android:targetSdkVersion="28" tools:overrideLibrary="org.kaliumjni.lib" />\n$1'))
 
         .pipe(gulp.dest(platformPath));