AutofillFramework/afservice/src/main/java/com/example/android/autofill/service/simple/DebugService.java [127:156]:
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    @Override
    public void onSaveRequest(SaveRequest request, SaveCallback callback) {
        Log.d(TAG, "onSaveRequest()");
        toast("Save not supported");
        callback.onSuccess();
    }

    /**
     * Parses the {@link AssistStructure} representing the activity being autofilled, and returns a
     * map of autofillable fields (represented by their autofill ids) mapped by the hint associate
     * with them.
     *
     * <p>An autofillable field is a {@link ViewNode} whose {@link #getHint(ViewNode)} metho
     */
    @NonNull
    private ArrayMap<String, AutofillId> getAutofillableFields(@NonNull AssistStructure structure) {
        ArrayMap<String, AutofillId> fields = new ArrayMap<>();
        int nodes = structure.getWindowNodeCount();
        for (int i = 0; i < nodes; i++) {
            ViewNode node = structure.getWindowNodeAt(i).getRootViewNode();
            addAutofillableFields(fields, node);
        }
        return fields;
    }

    /**
     * Adds any autofillable view from the {@link ViewNode} and its descendants to the map.
     */
    private void addAutofillableFields(@NonNull Map<String, AutofillId> fields,
            @NonNull ViewNode node) {
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AutofillFramework/afservice/src/main/java/com/example/android/autofill/service/simple/MultiStepsService.java [138:157]:
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    @Override
    public void onSaveRequest(SaveRequest request, SaveCallback callback) {
        Log.d(TAG, "onSaveRequest()");
        toast("Save not supported");
        callback.onSuccess();
    }

    @NonNull
    private ArrayMap<String, AutofillId> getAutofillableFields(@NonNull AssistStructure structure) {
        ArrayMap<String, AutofillId> fields = new ArrayMap<>();
        int nodes = structure.getWindowNodeCount();
        for (int i = 0; i < nodes; i++) {
            ViewNode node = structure.getWindowNodeAt(i).getRootViewNode();
            addAutofillableFields(fields, node);
        }
        return fields;
    }

    private void addAutofillableFields(@NonNull Map<String, AutofillId> fields,
            @NonNull ViewNode node) {
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