Log errors returned from method channel invocations in the text input plugin (#7476)

See https://github.com/flutter/flutter/issues/25715

ci/licenses_golden/licenses_flutter

@@ -424,6 +424,7 @@ FILE: ../../../flutter/shell/platform/android/io/flutter/plugin/common/ActivityL
 FILE: ../../../flutter/shell/platform/android/io/flutter/plugin/common/BasicMessageChannel.java
 FILE: ../../../flutter/shell/platform/android/io/flutter/plugin/common/BinaryCodec.java
 FILE: ../../../flutter/shell/platform/android/io/flutter/plugin/common/BinaryMessenger.java
+FILE: ../../../flutter/shell/platform/android/io/flutter/plugin/common/ErrorLogResult.java
 FILE: ../../../flutter/shell/platform/android/io/flutter/plugin/common/EventChannel.java
 FILE: ../../../flutter/shell/platform/android/io/flutter/plugin/common/FlutterException.java
 FILE: ../../../flutter/shell/platform/android/io/flutter/plugin/common/JSONMessageCodec.java

shell/platform/android/BUILD.gn

@@ -111,6 +111,7 @@ java_library("flutter_shell_java") {
     "io/flutter/plugin/common/BasicMessageChannel.java",
     "io/flutter/plugin/common/BinaryCodec.java",
     "io/flutter/plugin/common/BinaryMessenger.java",
+    "io/flutter/plugin/common/ErrorLogResult.java",
     "io/flutter/plugin/common/EventChannel.java",
     "io/flutter/plugin/common/FlutterException.java",
     "io/flutter/plugin/common/JSONMessageCodec.java",

shell/platform/android/io/flutter/plugin/common/ErrorLogResult.java

+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package io.flutter.plugin.common;
+
+import android.support.annotation.Nullable;
+import android.util.Log;
+
+/**
+ * An implementation of {@link MethodChannel.Result} that writes error results
+ * to the Android log.
+ */
+public class ErrorLogResult implements MethodChannel.Result {
+    private String tag;
+    private int level;
+
+    public ErrorLogResult(String tag) {
+        this(tag, Log.WARN);
+    }
+
+    public ErrorLogResult(String tag, int level) {
+        this.tag = tag;
+        this.level = level;
+    }
+
+    @Override
+    public void success(@Nullable Object result) {}
+
+    @Override
+    public void error(String errorCode, @Nullable String errorMessage, @Nullable Object errorDetails) {
+        String details = (errorDetails != null) ? " details: " + errorDetails : "";
+        Log.println(level, tag, errorMessage + details);
+    }
+
+    @Override
+    public void notImplemented() {
+      Log.println(level, tag, "method not implemented");
+    }
+}

shell/platform/android/io/flutter/plugin/editing/InputConnectionAdaptor.java

@@ -11,6 +11,7 @@ import android.view.KeyEvent;
 import android.view.inputmethod.BaseInputConnection;
 import android.view.inputmethod.EditorInfo;
 import android.view.inputmethod.InputMethodManager;
+import io.flutter.plugin.common.ErrorLogResult;
 import io.flutter.plugin.common.MethodChannel;
 import io.flutter.view.FlutterView;
 
@@ -25,6 +26,9 @@ class InputConnectionAdaptor extends BaseInputConnection {
     private int mBatchCount;
     private InputMethodManager mImm;
 
+    private static final MethodChannel.Result logger =
+        new ErrorLogResult("FlutterTextInput");
+
     public InputConnectionAdaptor(FlutterView view, int client,
         MethodChannel flutterChannel, Editable editable) {
         super(view, true);
@@ -58,7 +62,7 @@ class InputConnectionAdaptor extends BaseInputConnection {
         state.put("composingBase", composingStart);
         state.put("composingExtent", composingEnd);
         mFlutterChannel.invokeMethod("TextInputClient.updateEditingState",
-            Arrays.asList(mClient, state));
+            Arrays.asList(mClient, state), logger);
     }
 
     @Override
@@ -177,36 +181,36 @@ class InputConnectionAdaptor extends BaseInputConnection {
             // TODO(mattcarroll): is newline an appropriate action for "none"?
             case EditorInfo.IME_ACTION_NONE:
                 mFlutterChannel.invokeMethod("TextInputClient.performAction",
-                    Arrays.asList(mClient, "TextInputAction.newline"));
+                        Arrays.asList(mClient, "TextInputAction.newline"), logger);
                 break;
             case EditorInfo.IME_ACTION_UNSPECIFIED:
                 mFlutterChannel.invokeMethod("TextInputClient.performAction",
-                        Arrays.asList(mClient, "TextInputAction.unspecified"));
+                        Arrays.asList(mClient, "TextInputAction.unspecified"), logger);
                 break;
             case EditorInfo.IME_ACTION_GO:
                 mFlutterChannel.invokeMethod("TextInputClient.performAction",
-                        Arrays.asList(mClient, "TextInputAction.go"));
+                        Arrays.asList(mClient, "TextInputAction.go"), logger);
                 break;
             case EditorInfo.IME_ACTION_SEARCH:
                 mFlutterChannel.invokeMethod("TextInputClient.performAction",
-                        Arrays.asList(mClient, "TextInputAction.search"));
+                        Arrays.asList(mClient, "TextInputAction.search"), logger);
                 break;
             case EditorInfo.IME_ACTION_SEND:
                 mFlutterChannel.invokeMethod("TextInputClient.performAction",
-                        Arrays.asList(mClient, "TextInputAction.send"));
+                        Arrays.asList(mClient, "TextInputAction.send"), logger);
                 break;
             case EditorInfo.IME_ACTION_NEXT:
                 mFlutterChannel.invokeMethod("TextInputClient.performAction",
-                        Arrays.asList(mClient, "TextInputAction.next"));
+                        Arrays.asList(mClient, "TextInputAction.next"), logger);
                 break;
             case EditorInfo.IME_ACTION_PREVIOUS:
                 mFlutterChannel.invokeMethod("TextInputClient.performAction",
-                        Arrays.asList(mClient, "TextInputAction.previous"));
+                        Arrays.asList(mClient, "TextInputAction.previous"), logger);
                 break;
             default:
             case EditorInfo.IME_ACTION_DONE:
                 mFlutterChannel.invokeMethod("TextInputClient.performAction",
-                    Arrays.asList(mClient, "TextInputAction.done"));
+                    Arrays.asList(mClient, "TextInputAction.done"), logger);
                 break;
         }
         return true;