Add "Paste as plain text" in TextView's toolbar.

Test: bit FrameworksCoreTests:android.widget.TextViewActivityTest
Bug: 36179795
Change-Id: Iee0502678adcfb9de58c107b9247a528718b2c40
diff --git a/core/java/android/text/TextUtils.java b/core/java/android/text/TextUtils.java
index ee2b38e..081deeb 100644
--- a/core/java/android/text/TextUtils.java
+++ b/core/java/android/text/TextUtils.java
@@ -40,6 +40,7 @@
 import android.text.style.LeadingMarginSpan;
 import android.text.style.LocaleSpan;
 import android.text.style.MetricAffectingSpan;
+import android.text.style.ParagraphStyle;
 import android.text.style.QuoteSpan;
 import android.text.style.RelativeSizeSpan;
 import android.text.style.ReplacementSpan;
@@ -56,6 +57,7 @@
 import android.text.style.TypefaceSpan;
 import android.text.style.URLSpan;
 import android.text.style.UnderlineSpan;
+import android.text.style.UpdateAppearance;
 import android.util.Log;
 import android.util.Printer;
 import android.view.View;
@@ -1903,6 +1905,22 @@
         return Resources.getSystem().getQuantityString(R.plurals.selected_count, count, count);
     }
 
+    /**
+     * Returns whether or not the specified spanned text has a style span.
+     * @hide
+     */
+    public static boolean hasStyleSpan(@NonNull Spanned spanned) {
+        Preconditions.checkArgument(spanned != null);
+        final Class<?>[] styleClasses = {
+                CharacterStyle.class, ParagraphStyle.class, UpdateAppearance.class};
+        for (Class<?> clazz : styleClasses) {
+            if (spanned.nextSpanTransition(-1, spanned.length(), clazz) < spanned.length()) {
+                return true;
+            }
+        }
+        return false;
+    }
+
     private static Object sLock = new Object();
 
     private static char[] sTemp = null;
diff --git a/core/java/android/widget/Editor.java b/core/java/android/widget/Editor.java
index 481c160..18554be 100644
--- a/core/java/android/widget/Editor.java
+++ b/core/java/android/widget/Editor.java
@@ -154,10 +154,10 @@
     private static final int MENU_ITEM_ORDER_COPY = 5;
     private static final int MENU_ITEM_ORDER_PASTE = 6;
     private static final int MENU_ITEM_ORDER_SHARE = 7;
-    private static final int MENU_ITEM_ORDER_PASTE_AS_PLAIN_TEXT = 8;
-    private static final int MENU_ITEM_ORDER_SELECT_ALL = 9;
-    private static final int MENU_ITEM_ORDER_REPLACE = 10;
-    private static final int MENU_ITEM_ORDER_AUTOFILL = 11;
+    private static final int MENU_ITEM_ORDER_SELECT_ALL = 8;
+    private static final int MENU_ITEM_ORDER_REPLACE = 9;
+    private static final int MENU_ITEM_ORDER_AUTOFILL = 10;
+    private static final int MENU_ITEM_ORDER_PASTE_AS_PLAIN_TEXT = 11;
     private static final int MENU_ITEM_ORDER_PROCESS_TEXT_INTENT_ACTIONS_START = 100;
 
     // Each Editor manages its own undo stack.
@@ -2634,9 +2634,9 @@
                 .setAlphabeticShortcut('v')
                 .setEnabled(mTextView.canPaste())
                 .setOnMenuItemClickListener(mOnContextMenuItemClickListener);
-        menu.add(Menu.NONE, TextView.ID_PASTE, MENU_ITEM_ORDER_PASTE_AS_PLAIN_TEXT,
+        menu.add(Menu.NONE, TextView.ID_PASTE_AS_PLAIN_TEXT, MENU_ITEM_ORDER_PASTE_AS_PLAIN_TEXT,
                 com.android.internal.R.string.paste_as_plain_text)
-                .setEnabled(mTextView.canPaste())
+                .setEnabled(mTextView.canPasteAsPlainText())
                 .setOnMenuItemClickListener(mOnContextMenuItemClickListener);
         menu.add(Menu.NONE, TextView.ID_SHARE, MENU_ITEM_ORDER_SHARE,
                 com.android.internal.R.string.share)
@@ -3775,7 +3775,6 @@
             mode.setSubtitle(null);
             mode.setTitleOptionalHint(true);
             populateMenuWithItems(menu);
-            updateAssistMenuItem(menu);
 
             Callback customCallback = getCustomCallback();
             if (customCallback != null) {
@@ -3843,8 +3842,18 @@
                         .setShowAsAction(mode);
             }
 
+            if (mTextView.canPasteAsPlainText()) {
+                menu.add(
+                        Menu.NONE,
+                        TextView.ID_PASTE_AS_PLAIN_TEXT,
+                        MENU_ITEM_ORDER_PASTE_AS_PLAIN_TEXT,
+                        com.android.internal.R.string.paste_as_plain_text)
+                        .setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
+            }
+
             updateSelectAllItem(menu);
             updateReplaceItem(menu);
+            updateAssistMenuItem(menu);
         }
 
         @Override
diff --git a/core/java/android/widget/TextView.java b/core/java/android/widget/TextView.java
index 629216e..242dcf5 100644
--- a/core/java/android/widget/TextView.java
+++ b/core/java/android/widget/TextView.java
@@ -35,6 +35,7 @@
 import android.app.Activity;
 import android.app.assist.AssistStructure;
 import android.content.ClipData;
+import android.content.ClipDescription;
 import android.content.ClipboardManager;
 import android.content.Context;
 import android.content.Intent;
@@ -11042,6 +11043,26 @@
                         .hasPrimaryClip());
     }
 
+    boolean canPasteAsPlainText() {
+        if (!canPaste()) {
+            return false;
+        }
+
+        final ClipData clipData =
+                ((ClipboardManager) getContext().getSystemService(Context.CLIPBOARD_SERVICE))
+                        .getPrimaryClip();
+        final ClipDescription description = clipData.getDescription();
+        final boolean isPlainType = description.hasMimeType(ClipDescription.MIMETYPE_TEXT_PLAIN);
+        final CharSequence text = clipData.getItemAt(0).getText();
+        if (isPlainType && (text instanceof Spanned)) {
+            Spanned spanned = (Spanned) text;
+            if (TextUtils.hasStyleSpan(spanned)) {
+                return true;
+            }
+        }
+        return description.hasMimeType(ClipDescription.MIMETYPE_TEXT_HTML);
+    }
+
     boolean canProcessText() {
         if (getId() == View.NO_ID) {
             return false;
diff --git a/core/tests/coretests/src/android/widget/TextViewActivityTest.java b/core/tests/coretests/src/android/widget/TextViewActivityTest.java
index 2203b6a..ebab129 100644
--- a/core/tests/coretests/src/android/widget/TextViewActivityTest.java
+++ b/core/tests/coretests/src/android/widget/TextViewActivityTest.java
@@ -28,6 +28,7 @@
 import static android.widget.espresso.TextViewActions.longPressOnTextAtIndex;
 import static android.widget.espresso.TextViewAssertions.hasInsertionPointerAtIndex;
 import static android.widget.espresso.TextViewAssertions.hasSelection;
+import static android.widget.espresso.TextViewAssertions.doesNotHaveStyledText;
 import static android.widget.espresso.FloatingToolbarEspressoUtils.assertFloatingToolbarItemIndex;
 import static android.widget.espresso.FloatingToolbarEspressoUtils.assertFloatingToolbarIsDisplayed;
 import static android.widget.espresso.FloatingToolbarEspressoUtils.assertFloatingToolbarIsNotDisplayed;
@@ -47,9 +48,16 @@
 import static org.hamcrest.Matchers.anyOf;
 import static org.hamcrest.Matchers.is;
 
+import android.content.ClipData;
+import android.content.ClipboardManager;
+import android.text.TextUtils;
+import android.text.Spanned;
+import android.support.test.espresso.NoMatchingViewException;
+import android.support.test.espresso.ViewAssertion;
 import android.view.ActionMode;
 import android.view.Menu;
 import android.view.MenuItem;
+import android.view.View;
 import android.view.textclassifier.TextClassificationManager;
 import android.view.textclassifier.TextClassifier;
 import android.widget.espresso.CustomViewActions.RelativeCoordinatesProvider;
@@ -64,6 +72,8 @@
 
 import com.android.frameworks.coretests.R;
 
+import junit.framework.AssertionFailedError;
+
 /**
  * Tests the TextView widget from an Activity
  */
@@ -708,7 +718,8 @@
                     }
 
                     @Override
-                    public void onDestroyActionMode(ActionMode actionMode) {}
+                    public void onDestroyActionMode(ActionMode actionMode) {
+                    }
                 }));
         final String text = "droid@android.com";
 
@@ -717,4 +728,50 @@
         sleepForFloatingToolbarPopup();
         assertFloatingToolbarItemIndex(android.R.id.textAssist, 0);
     }
+
+    public void testPastePlainText_menuAction() throws Exception {
+        initializeClipboardWithText(TextStyle.STYLED);
+
+        onView(withId(R.id.textview)).perform(replaceText(""));
+        onView(withId(R.id.textview)).perform(longClick());
+        sleepForFloatingToolbarPopup();
+        clickFloatingToolbarItem(
+                getActivity().getString(com.android.internal.R.string.paste_as_plain_text));
+        getInstrumentation().waitForIdleSync();
+
+        onView(withId(R.id.textview)).check(matches(withText("styledtext")));
+        onView(withId(R.id.textview)).check(doesNotHaveStyledText());
+    }
+
+    public void testPastePlainText_noMenuItemForPlainText() {
+        initializeClipboardWithText(TextStyle.PLAIN);
+
+        onView(withId(R.id.textview)).perform(replaceText(""));
+        onView(withId(R.id.textview)).perform(longClick());
+        sleepForFloatingToolbarPopup();
+
+        assertFloatingToolbarDoesNotContainItem(
+                getActivity().getString(com.android.internal.R.string.paste_as_plain_text));
+    }
+
+    private void initializeClipboardWithText(TextStyle textStyle) {
+        final ClipData clip;
+        switch (textStyle) {
+            case STYLED:
+                clip = ClipData.newHtmlText("html", "styledtext", "<b>styledtext</b>");
+                break;
+            case PLAIN:
+                clip = ClipData.newPlainText("plain", "plaintext");
+                break;
+            default:
+                throw new IllegalArgumentException("Invalid text style");
+        }
+        getActivity().getWindow().getDecorView().post(() ->
+            getActivity().getSystemService(ClipboardManager.class).setPrimaryClip( clip));
+        getInstrumentation().waitForIdleSync();
+    }
+
+    private enum TextStyle {
+        PLAIN, STYLED
+    }
 }
diff --git a/core/tests/coretests/src/android/widget/espresso/TextViewAssertions.java b/core/tests/coretests/src/android/widget/espresso/TextViewAssertions.java
index 6e44cd8..2532731 100644
--- a/core/tests/coretests/src/android/widget/espresso/TextViewAssertions.java
+++ b/core/tests/coretests/src/android/widget/espresso/TextViewAssertions.java
@@ -26,6 +26,8 @@
 import android.graphics.drawable.Drawable;
 import android.support.test.espresso.NoMatchingViewException;
 import android.support.test.espresso.ViewAssertion;
+import android.text.Spanned;
+import android.text.TextUtils;
 import android.view.View;
 import android.widget.EditText;
 import android.widget.TextView;
@@ -100,22 +102,19 @@
      * @param index  A matcher representing the expected index.
      */
     public static ViewAssertion hasInsertionPointerAtIndex(final Matcher<Integer> index) {
-        return new ViewAssertion() {
-            @Override
-            public void check(View view, NoMatchingViewException exception) {
-                if (view instanceof TextView) {
-                    TextView textView = (TextView) view;
-                    int selectionStart = textView.getSelectionStart();
-                    int selectionEnd = textView.getSelectionEnd();
-                    try {
-                        assertThat(selectionStart, index);
-                        assertThat(selectionEnd, index);
-                    } catch (IndexOutOfBoundsException e) {
-                        throw new AssertionFailedError(e.getMessage());
-                    }
-                } else {
-                    throw new AssertionFailedError("TextView not found");
+        return (view, exception) -> {
+            if (view instanceof TextView) {
+                TextView textView = (TextView) view;
+                int selectionStart = textView.getSelectionStart();
+                int selectionEnd = textView.getSelectionEnd();
+                try {
+                    assertThat(selectionStart, index);
+                    assertThat(selectionEnd, index);
+                } catch (IndexOutOfBoundsException e) {
+                    throw new AssertionFailedError(e.getMessage());
                 }
+            } else {
+                throw new AssertionFailedError("TextView not found");
             }
         };
     }
@@ -137,6 +136,19 @@
     }
 
     /**
+     * Returns a {@link ViewAssertion} that asserts that the TextView does not contain styled text.
+     */
+    public static ViewAssertion doesNotHaveStyledText() {
+        return (view, exception) -> {
+            final CharSequence text = ((TextView) view).getText();
+            if (text instanceof Spanned && !TextUtils.hasStyleSpan((Spanned) text)) {
+                return;
+            }
+            throw new AssertionFailedError("TextView has styled text");
+        };
+    }
+
+    /**
      * A {@link ViewAssertion} to check the selected text in a {@link TextView}.
      */
     private static final class TextSelectionAssertion implements ViewAssertion {