Fix the newline on some keyboards

shell/platform/android/BUILD.gn

@@ -435,10 +435,12 @@ action("robolectric_tests") {
     "test/io/flutter/embedding/engine/systemchannels/PlatformChannelTest.java",
     "test/io/flutter/external/FlutterLaunchTests.java",
     "test/io/flutter/plugin/common/StandardMessageCodecTest.java",
+    "test/io/flutter/plugin/editing/InputConnectionAdaptorTest.java",
     "test/io/flutter/plugin/editing/TextInputPluginTest.java",
     "test/io/flutter/plugin/platform/PlatformPluginTest.java",
     "test/io/flutter/plugin/platform/SingleViewPresentationTest.java",
     "test/io/flutter/plugins/GeneratedPluginRegistrant.java",
+    "test/io/flutter/util/FakeKeyEvent.java",
     "test/io/flutter/util/PreconditionsTest.java",
   ]
 

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

@@ -10,6 +10,7 @@
 import android.provider.Settings;
 import android.text.DynamicLayout;
 import android.text.Editable;
+import android.text.InputType;
 import android.text.Layout;
 import android.text.Selection;
 import android.text.TextPaint;
@@ -274,8 +275,11 @@ public boolean sendKeyEvent(KeyEvent event) {
         int newSel = Math.min(selStart + 1, mEditable.length());
         setSelection(newSel, newSel);
         return true;
-      } else if (event.getKeyCode() == KeyEvent.KEYCODE_ENTER
-          || event.getKeyCode() == KeyEvent.KEYCODE_NUMPAD_ENTER) {
+        // When the enter key is pressed on a non-multiline field, consider it a
+        // submit instead of a newline.
+      } else if ((event.getKeyCode() == KeyEvent.KEYCODE_ENTER
+              || event.getKeyCode() == KeyEvent.KEYCODE_NUMPAD_ENTER)
+          && (InputType.TYPE_TEXT_FLAG_MULTI_LINE & mEditorInfo.inputType) == 0) {
         performEditorAction(mEditorInfo.imeOptions & EditorInfo.IME_MASK_ACTION);
         return true;
       } else {

shell/platform/android/test/io/flutter/FlutterTestSuite.java

@@ -17,6 +17,7 @@
 import io.flutter.embedding.engine.systemchannels.PlatformChannelTest;
 import io.flutter.external.FlutterLaunchTests;
 import io.flutter.plugin.common.StandardMessageCodecTest;
+import io.flutter.plugin.editing.InputConnectionAdaptorTest;
 import io.flutter.plugin.editing.TextInputPluginTest;
 import io.flutter.plugin.platform.PlatformPluginTest;
 import io.flutter.plugin.platform.SingleViewPresentationTest;
@@ -44,6 +45,7 @@
   FlutterShellArgsTest.class,
   FlutterRendererTest.class,
   FlutterViewTest.class,
+  InputConnectionAdaptorTest.class,
   PlatformChannelTest.class,
   PlatformPluginTest.class,
   PluginComponentTest.class,

shell/platform/android/test/io/flutter/plugin/editing/InputConnectionAdaptorTest.java

@@ -0,0 +1,50 @@
+package io.flutter.plugin.editing;
+
+import static org.mockito.Mockito.anyString;
+import static org.mockito.Mockito.eq;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+
+import android.content.res.AssetManager;
+import android.text.Editable;
+import android.text.InputType;
+import android.view.KeyEvent;
+import android.view.View;
+import android.view.inputmethod.EditorInfo;
+import io.flutter.embedding.engine.FlutterJNI;
+import io.flutter.embedding.engine.dart.DartExecutor;
+import io.flutter.embedding.engine.systemchannels.TextInputChannel;
+import io.flutter.util.FakeKeyEvent;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.RuntimeEnvironment;
+import org.robolectric.annotation.Config;
+
+@Config(manifest = Config.NONE, sdk = 27)
+@RunWith(RobolectricTestRunner.class)
+public class InputConnectionAdaptorTest {
+  @Test
+  public void inputConnectionAdaptor_ReceivesEnter() throws NullPointerException {
+    View testView = new View(RuntimeEnvironment.application);
+    FlutterJNI mockFlutterJni = mock(FlutterJNI.class);
+    DartExecutor dartExecutor = spy(new DartExecutor(mockFlutterJni, mock(AssetManager.class)));
+    int inputTargetId = 0;
+    TextInputChannel textInputChannel = new TextInputChannel(dartExecutor);
+    Editable mEditable = Editable.Factory.getInstance().newEditable("");
+    Editable spyEditable = spy(mEditable);
+    EditorInfo outAttrs = new EditorInfo();
+    outAttrs.inputType = InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_FLAG_MULTI_LINE;
+
+    InputConnectionAdaptor inputConnectionAdaptor =
+        new InputConnectionAdaptor(
+            testView, inputTargetId, textInputChannel, spyEditable, outAttrs);
+
+    // Send an enter key and make sure the Editable received it.
+    FakeKeyEvent keyEvent = new FakeKeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_ENTER);
+    inputConnectionAdaptor.sendKeyEvent(keyEvent);
+    verify(spyEditable, times(1)).insert(eq(0), anyString());
+  }
+}

shell/platform/android/test/io/flutter/util/FakeKeyEvent.java

@@ -0,0 +1,15 @@
+package io.flutter.util;
+
+import android.view.KeyEvent;
+
+// In the test environment, keyEvent.getUnicodeChar throws an exception. This
+// class works around the exception by hardcoding the returned value.
+public class FakeKeyEvent extends KeyEvent {
+  public FakeKeyEvent(int action, int keyCode) {
+    super(action, keyCode);
+  }
+
+  public final int getUnicodeChar() {
+    return 1;
+  }
+}