Improve android logging: Remove unnecessary print statements, and use Log.w where necessary

android/src/main/java/io/ably/flutter/plugin/AblyEventStreamHandler.java

@@ -3,6 +3,7 @@
 import android.content.Context;
 import android.os.Handler;
 import android.os.Looper;
+import android.util.Log;
 
 import java.util.Map;
 
@@ -26,6 +27,7 @@
  */
 public class AblyEventStreamHandler implements EventChannel.StreamHandler {
 
+  private static final String TAG = AblyEventStreamHandler.class.getName();
   /**
    * Creating an ablyLibrary instance.
    * As ablyLibrary is a singleton,
@@ -197,7 +199,7 @@ public void onListen(Object object, EventChannel.EventSink uiThreadEventSink) {
   @Override
   public void onCancel(Object object) {
     if (object == null) {
-      System.out.println("Cannot process null input on cancel");
+      Log.w(TAG, "onCancel cannot decode null");
       return;
     }
     final AblyFlutterMessage<AblyEventMessage<Object>> ablyMessage = getMessage(object);

android/src/main/java/io/ably/flutter/plugin/AblyFlutterPlugin.java

@@ -76,9 +76,7 @@ private void setupChannels(BinaryMessenger messenger, Context applicationContext
     }
 
     @Override
-    public void onDetachedFromEngine(@NonNull FlutterPluginBinding binding) {
-        System.out.println("Ably Plugin onDetachedFromEngine");
-    }
+    public void onDetachedFromEngine(@NonNull FlutterPluginBinding binding) {}
 
     private static MethodCodec createCodec(CipherParamsStorage cipherParamsStorage) {
         return new StandardMethodCodec(new AblyMessageCodec(cipherParamsStorage));

android/src/main/java/io/ably/flutter/plugin/AblyMessageCodec.java

@@ -1,5 +1,7 @@
 package io.ably.flutter.plugin;
 
+import android.util.Log;
+
 import androidx.annotation.Nullable;
 
 import com.google.firebase.messaging.RemoteMessage;
@@ -58,7 +60,7 @@ interface CodecDecoder<T> {
   }
 
   private static class CodecPair<T> {
-
+    private static final String TAG = CodecPair.class.getName();
     final CodecEncoder<T> encoder;
     final CodecDecoder<T> decoder;
 
@@ -69,15 +71,15 @@ private static class CodecPair<T> {
 
     Map<String, Object> encode(final Object value) {
       if (this.encoder == null) {
-        System.out.println("Codec encoder not defined");
+        Log.w(TAG, "Encoder is null");
         return null;
       }
       return this.encoder.encode((T) value);
     }
 
     T decode(Map<String, Object> jsonMap) {
       if (this.decoder == null) {
-        System.out.println("Codec decoder not defined");
+        Log.w(TAG, "Decoder is null");
         return null;
       }
       return this.decoder.decode(jsonMap);

android/src/main/java/io/ably/flutter/plugin/AblyMethodCallHandler.java

@@ -151,7 +151,6 @@ private void handleAblyException(@NonNull MethodChannel.Result result, @NonNull
   @Override
   public void onMethodCall(@NonNull MethodCall call, @NonNull MethodChannel.Result rawResult) {
     final MethodChannel.Result result = new MethodResultWrapper(rawResult);
-    System.out.println("Ably Plugin handle: " + call.method);
     final BiConsumer<MethodCall, MethodChannel.Result> handler = _map.get(call.method);
     if (null == handler) {
       // We don't have a handler for a method with this name so tell the caller.
@@ -177,7 +176,6 @@ public void onError(ErrorInfo reason) {
   }
 
   private void register(@NonNull MethodCall call, @NonNull MethodChannel.Result result) {
-    System.out.println("Registering library instance to clean up any existing instances");
     hotRestartCallback.on();
     _ably.dispose();
     result.success(null);
@@ -205,10 +203,7 @@ public void success(@Nullable Object result) {
 
                 @Override
                 public void error(String errorCode, @Nullable String errorMessage, @Nullable Object errorDetails) {
-                  System.out.println(errorDetails);
-                  if (errorMessage != null) {
-                    result.error("40000", String.format("Error from authCallback: %s", errorMessage), errorDetails);
-                  }
+                  result.error("40000", String.format("Error from authCallback: %s", errorMessage), errorDetails);
                   latch.countDown();
                 }