Update TextClassifier Javadoc.

Bug: 65112496
Test: none
Change-Id: Id3732a2c8ed372be0f717346e6aa92b9e614ad04

core/java/android/view/textclassifier/TextClassification.java

@@ -33,6 +33,52 @@ import java.util.List;
 
 /**
  * Information for generating a widget to handle classified text.
+ *
+ * <p>A TextClassification object contains icons, labels, onClickListeners and intents that may
+ * be used to build a widget that can be used to act on classified text.
+ *
+ * <p>e.g. building a view that, when clicked, shares the classified text with the preferred app:
+ *
+ * <pre>{@code
+ *   // Called preferably outside the UiThread.
+ *   TextClassification classification = textClassifier.classifyText(allText, 10, 25, null);
+ *
+ *   // Called on the UiThread.
+ *   Button button = new Button(context);
+ *   button.setCompoundDrawablesWithIntrinsicBounds(classification.getIcon(), null, null, null);
+ *   button.setText(classification.getLabel());
+ *   button.setOnClickListener(classification.getOnClickListener());
+ * }</pre>
+ *
+ * <p>e.g. starting an action mode with menu items that can handle the classified text:
+ *
+ * <pre>{@code
+ *   // Called preferably outside the UiThread.
+ *   final TextClassification classification = textClassifier.classifyText(allText, 10, 25, null);
+ *
+ *   // Called on the UiThread.
+ *   view.startActionMode(new ActionMode.Callback() {
+ *
+ *       public boolean onCreateActionMode(ActionMode mode, Menu menu) {
+ *           for (int i = 0; i < classification.getActionCount(); i++) {
+ *               if (thisAppHasPermissionToInvokeIntent(classification.getIntent(i))) {
+ *                   menu.add(Menu.NONE, i, 20, classification.getLabel(i))
+ *                      .setIcon(classification.getIcon(i))
+ *                      .setIntent(classification.getIntent(i));
+ *               }
+ *           }
+ *           return true;
+ *       }
+ *
+ *       public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
+ *           context.startActivity(item.getIntent());
+ *           return true;
+ *       }
+ *
+ *       ...
+ *   });
+ * }</pre>
+ *
  */
 public final class TextClassification {
 

core/java/android/view/textclassifier/TextClassifier.java

@@ -29,8 +29,8 @@ import java.lang.annotation.RetentionPolicy;
 /**
  * Interface for providing text classification related features.
  *
- * <p>Unless otherwise stated, methods of this interface are blocking operations and you should
- * avoid calling them on the UI thread.
+ * <p>Unless otherwise stated, methods of this interface are blocking operations.
+ * Avoid calling them on the UI thread.
  */
 public interface TextClassifier {
 
@@ -75,8 +75,8 @@ public interface TextClassifier {
     };
 
     /**
-     * Returns suggested text selection indices, recognized types and their associated confidence
-     * scores. The selections are ordered from highest to lowest scoring.
+     * Returns suggested text selection start and end indices, recognized entity types, and their
+     * associated confidence scores. The entity types are ordered from highest to lowest scoring.
      *
      * @param text text providing context for the selected text (which is specified
      *      by the sub sequence starting at selectionStartIndex and ending at selectionEndIndex)