Fix encoding issues in Android build

- Replaced non-ASCII arrow character in `AndroidScreenshotTask.java` with ASCII "->" to fix compilation error.
- Updated `Ports/Android/build.xml` to explicitly use `encoding="UTF-8"` for `javac` tasks.
- Updated `.ci/container/Dockerfile` to generate and enforce `en_US.UTF-8` locale in the build container.

Author: google-labs-jules[bot]

.ci/container/Dockerfile

@@ -112,4 +112,13 @@ ENV JDK25_HOME=/usr/lib/jvm/java-25-zulu
 RUN update-alternatives --install /usr/bin/java java /usr/lib/jvm/zulu8-fx/bin/java 100 && \
     update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/zulu8-fx/bin/javac 100
 
+# Set locale to UTF-8
+RUN apt-get update && apt-get install -y locales && \
+    locale-gen en_US.UTF-8 && \
+    update-locale LANG=en_US.UTF-8
+
+ENV LANG=en_US.UTF-8 \
+    LANGUAGE=en_US:en \
+    LC_ALL=en_US.UTF-8
+
 CMD ["/bin/bash"]

Ports/Android/build.xml

@@ -101,12 +101,12 @@
         <echo message="Building to javac.classpath = ${javac.classpath}" />
         <echo message="build.classes.dir = ${build.classes.dir}" />
         <echo message="src.dir = ${src.dir}" />
-        <javac destdir="build/tmp"
+        <javac destdir="build/tmp" encoding="UTF-8"
             classpath="${javac.classpath}:${build.classes.dir}">
             <src path="../../CodenameOne/src" />
         </javac>        
         <delete file="build/tmp/com/codename1/impl/CodenameOneThread.class" />
-        <javac destdir="build/tmp"
+        <javac destdir="build/tmp" encoding="UTF-8"
             classpath="${javac.classpath}:build/tmp">
             <src path="${src.dir}" />
         </javac>        

Ports/Android/src/com/codename1/impl/android/AndroidScreenshotTask.java

@@ -73,7 +73,7 @@ public void onPixelCopyFinished(int copyResult) {
                     new Handler(Looper.getMainLooper())
             );
         } catch (Throwable t) {
-            // Any unexpected issue → fallback
+            // Any unexpected issue -> fallback
             Log.e(t);
             tryFallbackDraw(w, h);
         }