Talkback properties update for AX sidebar
Summary: Talkback-description now called talkback-output to avoid confusion about content-description. Talkback-output now includes the state and role of the view as well so it is more accurate to Talkback's actual output. Talkback-hint also added as a property to show what talkback will append to the description if a user has hints turned on. This may not always be 100% accurate because talkback changes what it says based on certain events and global settings as well but is correct for most general-use cases. Reviewed By: blavalla Differential Revision: D9317270 fbshipit-source-id: df9b9b5ebef19f583cbf997e0cd3fac6450170bb
This commit is contained in:
Sara Valderrama
committed by
Facebook Github Bot
Facebook Github Bot
parent
e76a6ef529
commit
e82808da6f
@@ -19,7 +19,6 @@ import android.os.Build;
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import android.support.v4.view.MarginLayoutParamsCompat;
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import android.support.v4.view.ViewCompat;
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import android.support.v4.view.accessibility.AccessibilityNodeInfoCompat;
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import android.util.Log;
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import android.util.SparseArray;
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import android.view.Gravity;
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import android.view.View;
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@@ -25,45 +25,52 @@ public class AccessibilityRoleUtil {
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* date with their implementation. Details can be seen in their source code here:
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*
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* <p>https://github.com/google/talkback/blob/master/utils/src/main/java/Role.java
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*
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* The roles spoken by Talkback (roleStrings) should also be kept up to date and are found here:
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*
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* <p>https://github.com/google/talkback/compositor/src/main/res/values/strings.xml
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* <p>https://github.com/google/talkback/compositor/src/main/res/raw/compositor.json
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*/
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public enum AccessibilityRole {
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NONE(null),
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BUTTON("android.widget.Button"),
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CHECK_BOX("android.widget.CompoundButton"),
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DROP_DOWN_LIST("android.widget.Spinner"),
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EDIT_TEXT("android.widget.EditText"),
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GRID("android.widget.GridView"),
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IMAGE("android.widget.ImageView"),
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IMAGE_BUTTON("android.widget.ImageView"),
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LIST("android.widget.AbsListView"),
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PAGER("android.support.v4.view.ViewPager"),
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RADIO_BUTTON("android.widget.RadioButton"),
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SEEK_CONTROL("android.widget.SeekBar"),
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SWITCH("android.widget.Switch"),
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TAB_BAR("android.widget.TabWidget"),
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TOGGLE_BUTTON("android.widget.ToggleButton"),
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VIEW_GROUP("android.view.ViewGroup"),
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WEB_VIEW("android.webkit.WebView"),
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CHECKED_TEXT_VIEW("android.widget.CheckedTextView"),
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PROGRESS_BAR("android.widget.ProgressBar"),
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ACTION_BAR_TAB("android.app.ActionBar$Tab"),
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DRAWER_LAYOUT("android.support.v4.widget.DrawerLayout"),
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SLIDING_DRAWER("android.widget.SlidingDrawer"),
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ICON_MENU("com.android.internal.view.menu.IconMenuView"),
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TOAST("android.widget.Toast$TN"),
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DATE_PICKER_DIALOG("android.app.DatePickerDialog"),
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TIME_PICKER_DIALOG("android.app.TimePickerDialog"),
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DATE_PICKER("android.widget.DatePicker"),
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TIME_PICKER("android.widget.TimePicker"),
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NUMBER_PICKER("android.widget.NumberPicker"),
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SCROLL_VIEW("android.widget.ScrollView"),
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HORIZONTAL_SCROLL_VIEW("android.widget.HorizontalScrollView"),
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KEYBOARD_KEY("android.inputmethodservice.Keyboard$Key");
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NONE(null, ""),
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BUTTON("android.widget.Button", "Button"),
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CHECK_BOX("android.widget.CompoundButton", "Check box"),
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DROP_DOWN_LIST("android.widget.Spinner", "Drop down list"),
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EDIT_TEXT("android.widget.EditText", "Edit box"),
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GRID("android.widget.GridView", "Grid"),
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IMAGE("android.widget.ImageView", "Image"),
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IMAGE_BUTTON("android.widget.ImageView", "Button"),
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LIST("android.widget.AbsListView", "List"),
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PAGER("android.support.v4.view.ViewPager", "Multi-page view"),
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RADIO_BUTTON("android.widget.RadioButton", "Radio button"),
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SEEK_CONTROL("android.widget.SeekBar", "Seek control"),
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SWITCH("android.widget.Switch", "Switch"),
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TAB_BAR("android.widget.TabWidget", "Tab bar"),
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TOGGLE_BUTTON("android.widget.ToggleButton", "Switch"),
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VIEW_GROUP("android.view.ViewGroup", ""),
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WEB_VIEW("android.webkit.WebView", "Webview"),
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CHECKED_TEXT_VIEW("android.widget.CheckedTextView", ""),
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PROGRESS_BAR("android.widget.ProgressBar", "Progress bar"),
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ACTION_BAR_TAB("android.app.ActionBar$Tab", ""),
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DRAWER_LAYOUT("android.support.v4.widget.DrawerLayout", ""),
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SLIDING_DRAWER("android.widget.SlidingDrawer", ""),
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ICON_MENU("com.android.internal.view.menu.IconMenuView", ""),
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TOAST("android.widget.Toast$TN", ""),
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DATE_PICKER_DIALOG("android.app.DatePickerDialog", ""),
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TIME_PICKER_DIALOG("android.app.TimePickerDialog", ""),
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DATE_PICKER("android.widget.DatePicker", ""),
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TIME_PICKER("android.widget.TimePicker", ""),
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NUMBER_PICKER("android.widget.NumberPicker", ""),
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SCROLL_VIEW("android.widget.ScrollView", ""),
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HORIZONTAL_SCROLL_VIEW("android.widget.HorizontalScrollView", ""),
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KEYBOARD_KEY("android.inputmethodservice.Keyboard$Key", "");
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@Nullable private final String mValue;
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private final String mRoleString;
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AccessibilityRole(String type) {
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AccessibilityRole(String type, String roleString) {
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mValue = type;
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mRoleString = roleString;
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}
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@Nullable
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@@ -71,6 +78,8 @@ public class AccessibilityRoleUtil {
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return mValue;
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}
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public String getRoleString() { return mRoleString; }
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public static AccessibilityRole fromValue(String value) {
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for (AccessibilityRole role : AccessibilityRole.values()) {
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if (role.getValue() != null && role.getValue().equals(value)) {
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@@ -120,4 +129,11 @@ public class AccessibilityRoleUtil {
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return role;
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}
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public static String getTalkbackRoleString(View view) {
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if (view == null) {
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return "";
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}
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return getRole(view).getRoleString();
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}
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}
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@@ -33,6 +33,9 @@ import javax.annotation.Nullable;
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* are unnecessary here.
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*/
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public final class AccessibilityUtil {
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private static final String delimiter = ", ";
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private static final int delimiterLength = delimiter.length();
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private AccessibilityUtil() {}
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public static final EnumMapping sAccessibilityActionMapping =
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@@ -207,16 +210,225 @@ public final class AccessibilityUtil {
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}
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}
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private static boolean supportsAction(AccessibilityNodeInfoCompat node, int action) {
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if (node != null) {
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final int supportedActions = node.getActions();
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if ((supportedActions & action) == action) {
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return true;
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}
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}
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return false;
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}
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/**
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* Creates the text that Gogole's TalkBack screen reader will read aloud for a given {@link View}.
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* Adds the state segments of Talkback's response to a given list. This should be kept up to date as
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* much as necessary. Details can be seen in the source code here :
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*
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* https://github.com/google/talkback/compositor/src/main/res/raw/compositor.json
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* - search for "description_for_tree_status", "get_switch_state"
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*
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* https://github.com/google/talkback/compositor/src/main/res/values/strings.xml
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*/
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private static void addStateSegments(StringBuilder talkbackSegments, AccessibilityNodeInfoCompat node, AccessibilityRoleUtil.AccessibilityRole role) {
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// selected status is always prepended
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if (node.isSelected()) {
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talkbackSegments.append("selected" + delimiter);
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}
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// next check collapse/expand/checked status
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if (supportsAction(node, AccessibilityNodeInfoCompat.ACTION_EXPAND)) {
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talkbackSegments.append("collapsed" + delimiter);
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}
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if (supportsAction(node, AccessibilityNodeInfoCompat.ACTION_COLLAPSE)) {
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talkbackSegments.append("expanded" + delimiter);
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}
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String roleString = role.getRoleString();
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if (node.isCheckable() && !roleString.equals("Switch") &&
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(!role.equals(AccessibilityRoleUtil.AccessibilityRole.CHECKED_TEXT_VIEW) || node.isChecked())) {
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talkbackSegments.append((node.isChecked() ? "checked" : "not checked") + delimiter);
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}
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if (roleString.equals("Switch")) {
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CharSequence switchState = node.getText();
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if (TextUtils.isEmpty(switchState) || role == AccessibilityRoleUtil.AccessibilityRole.TOGGLE_BUTTON) {
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talkbackSegments.append((node.isChecked() ? "checked" : "not checked") + delimiter);
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} else {
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talkbackSegments.append(switchState + delimiter);
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}
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}
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}
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private static String removeFinalDelimiter(StringBuilder builder) {
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int end = builder.length();
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if (end > 0) {
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builder.delete(end - delimiterLength, end);
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}
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return builder.toString();
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}
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private static final int SYSTEM_ACTION_MAX = 0x01FFFFFF;
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private static String getHintForCustomActions(AccessibilityNodeInfoCompat node) {
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StringBuilder customActions = new StringBuilder();
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for (AccessibilityNodeInfoCompat.AccessibilityActionCompat action : node.getActionList()) {
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int id = action.getId();
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CharSequence label = action.getLabel();
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if (id > SYSTEM_ACTION_MAX) {
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// don't include custom actions that don't have a label
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if (!TextUtils.isEmpty(label)) {
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customActions.append(label + delimiter);
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}
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} else if (id == AccessibilityNodeInfoCompat.ACTION_DISMISS) {
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customActions.append("Dismiss" + delimiter);
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} else if (id == AccessibilityNodeInfoCompat.ACTION_EXPAND) {
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customActions.append("Expand" + delimiter);
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} else if (id == AccessibilityNodeInfoCompat.ACTION_COLLAPSE) {
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customActions.append("Collapse" + delimiter);
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}
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}
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String actions = removeFinalDelimiter(customActions);
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return actions.length() > 0 ? "Actions: " + actions : "";
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}
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// currently this is not used because the Talkback source logic seems erroneous resulting in get_hint_for_actions never
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// returning any strings - see the TO DO in getTalkbackHint below once source is fixed
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private static String getHintForActions(AccessibilityNodeInfoCompat node) {
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StringBuilder actions = new StringBuilder();
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for (AccessibilityNodeInfoCompat.AccessibilityActionCompat action : node.getActionList()) {
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int id = action.getId();
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CharSequence label = action.getLabel();
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if (id != AccessibilityNodeInfoCompat.ACTION_CLICK && id != AccessibilityNodeInfoCompat.ACTION_LONG_CLICK &&
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!TextUtils.isEmpty(label) && id <= SYSTEM_ACTION_MAX) {
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actions.append(label + delimiter);
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}
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}
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return removeFinalDelimiter(actions);
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}
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private static String getHintForClick(AccessibilityNodeInfoCompat node) {
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for (AccessibilityNodeInfoCompat.AccessibilityActionCompat action : node.getActionList()) {
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int id = action.getId();
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CharSequence label = action.getLabel();
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if (id == AccessibilityNodeInfoCompat.ACTION_CLICK && !TextUtils.isEmpty(label)) {
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return "Double tap to " + label;
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}
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}
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if (node.isCheckable()) {
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return "Double tap to toggle";
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}
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if (node.isClickable()) {
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return "Double tap to activate";
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}
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return "";
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}
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private static String getHintForLongClick(AccessibilityNodeInfoCompat node) {
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for (AccessibilityNodeInfoCompat.AccessibilityActionCompat action : node.getActionList()) {
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int id = action.getId();
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CharSequence label = action.getLabel();
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if (id == AccessibilityNodeInfoCompat.ACTION_LONG_CLICK && !TextUtils.isEmpty(label)) {
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return "Double tap and hold to " + label;
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}
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}
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if (node.isLongClickable()) {
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return "Double tap and hold to long press";
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}
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return "";
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}
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/**
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* Creates the text that Google's TalkBack screen reader will read aloud for a given {@link View}'s hint.
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* This hint is generally ported over from Google's TalkBack screen reader, and this should be kept up to
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* date with their implementation (as much as necessary). Hints can be turned off by user, so it may not
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* actually be spoken and this method assumes the selection style is double tapping (it can also be set to
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* keyboard or single tap but the general idea for the hint is the same). Details can be seen in their
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* source code here:
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*
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* https://github.com/google/talkback/compositor/src/main/res/raw/compositor.json
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* - search for "get_hint_from_node"
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*
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* https://github.com/google/talkback/compositor/src/main/res/values/strings.xml
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*
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* @param view The {@link View} to evaluate for a hint.
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* @return {@code String} representing the hint talkback will say when a {@link View} is focused.
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*/
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public static CharSequence getTalkbackHint(View view) {
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final AccessibilityNodeInfoCompat node = ViewAccessibilityHelper.createNodeInfoFromView(view);
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if (node == null) {
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return "";
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}
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StringBuilder hint = new StringBuilder();
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if (node.isEnabled()) {
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AccessibilityRoleUtil.AccessibilityRole role = AccessibilityRoleUtil.getRole(view);
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// special cases for spinners, pagers, and seek bars
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if (role == AccessibilityRoleUtil.AccessibilityRole.DROP_DOWN_LIST) {
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return "Double tap to change";
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} else if (role == AccessibilityRoleUtil.AccessibilityRole.PAGER) {
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if (supportsAction(node, AccessibilityNodeInfoCompat.ACTION_SCROLL_FORWARD) || supportsAction(node, AccessibilityNodeInfoCompat.ACTION_SCROLL_BACKWARD)) {
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return "Swipe with two fingers to switch pages";
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} else {
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return "No more pages";
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}
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} else if (role == AccessibilityRoleUtil.AccessibilityRole.SEEK_CONTROL &&
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(supportsAction(node, AccessibilityNodeInfoCompat.ACTION_SCROLL_FORWARD) || supportsAction(node, AccessibilityNodeInfoCompat.ACTION_SCROLL_BACKWARD))) {
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return "Use volume keys to adjust";
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} else {
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// first custom actions
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String segmentToAdd = getHintForCustomActions(node);
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if (segmentToAdd.length() > 0) { hint.append(segmentToAdd + delimiter); }
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// TODO: add getHintForActions(node) here if Talkback source gets fixed.
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// Currently the "get_hint_for_actions" in the compositor source never adds to Talkback output
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// because of a mismatched if condition/body. If this changes, we should also add a getHintForActions
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// method here. Source at https://github.com/google/talkback/compositor/src/main/res/raw/compositor.json
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// then normal tap (special case for EditText)
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if (role == AccessibilityRoleUtil.AccessibilityRole.EDIT_TEXT) {
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if (!node.isFocused()) {
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hint.append("Double tap to enter text" + delimiter);
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}
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} else {
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segmentToAdd = getHintForClick(node);
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if (segmentToAdd.length() > 0) { hint.append(segmentToAdd + delimiter); }
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}
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// then long press
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segmentToAdd = getHintForLongClick(node);
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if (segmentToAdd.length() > 0) { hint.append(segmentToAdd + delimiter); }
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}
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}
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node.recycle();
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return removeFinalDelimiter(hint);
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}
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/**
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* Creates the text that Google's TalkBack screen reader will read aloud for a given {@link View}.
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* This may be any combination of the {@link View}'s {@code text}, {@code contentDescription}, and
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* the {@code text} and {@code contentDescription} of any ancestor {@link View}.
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*
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* <p>Note: This string does not include any additional semantic information that Talkback will
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* read, such as "Button", or "disabled".
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* This description is generally ported over from Google's TalkBack screen reader, and this should be kept up to
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* date with their implementation (as much as necessary). Details can be seen in their source code here:
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*
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* https://github.com/google/talkback/compositor/src/main/res/raw/compositor.json
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* - search for "get_description_for_tree", "append_description_for_tree", "description_for_tree_nodes"
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*
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* @param view The {@link View} to evaluate.
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* @return {@code String} describing why a {@link View} is focusable.
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* @return {@code String} representing what talkback will say when a {@link View} is focused.
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*/
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@Nullable
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public static CharSequence getTalkbackDescription(View view) {
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@@ -231,20 +443,46 @@ public final class AccessibilityUtil {
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final boolean hasNodeText = !TextUtils.isEmpty(nodeText);
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final boolean isEditText = view instanceof EditText;
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// EditText's prioritize their own text content over a contentDescription
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StringBuilder talkbackSegments = new StringBuilder();
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AccessibilityRoleUtil.AccessibilityRole role = AccessibilityRoleUtil.getRole(view);
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String roleString = (String) node.getRoleDescription();
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if (roleString == null) {
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roleString = role.getRoleString();
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}
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boolean disabled = AccessibilityEvaluationUtil.isActionableForAccessibility(node) && !node.isEnabled();
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// EditText's prioritize their own text content over a contentDescription so skip this
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if (!TextUtils.isEmpty(contentDescription) && (!isEditText || !hasNodeText)) {
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return contentDescription;
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// first prepend any status modifiers
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addStateSegments(talkbackSegments, node, role);
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// next add content description
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talkbackSegments.append(contentDescription + delimiter);
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// then role
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if (roleString.length() > 0) { talkbackSegments.append(roleString + delimiter); }
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// lastly disabled is appended if applicable
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if (disabled) { talkbackSegments.append("disabled" + delimiter); }
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return removeFinalDelimiter(talkbackSegments);
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}
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// EditText
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if (hasNodeText) {
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return nodeText;
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// skip status checks for EditText, but description, role, and disabled are included
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talkbackSegments.append(nodeText + delimiter);
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if (roleString.length() > 0) { talkbackSegments.append(roleString + delimiter); }
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if (disabled) { talkbackSegments.append("disabled" + delimiter); }
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return removeFinalDelimiter(talkbackSegments);
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}
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// If there are child views and no contentDescription the text of all non-focusable children,
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// comma separated, becomes the description.
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if (view instanceof ViewGroup) {
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final StringBuilder concatChildDescription = new StringBuilder();
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final String separator = ", ";
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final ViewGroup viewGroup = (ViewGroup) view;
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for (int i = 0, count = viewGroup.getChildCount(); i < count; i++) {
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@@ -253,22 +491,17 @@ public final class AccessibilityUtil {
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final AccessibilityNodeInfoCompat childNodeInfo = AccessibilityNodeInfoCompat.obtain();
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ViewCompat.onInitializeAccessibilityNodeInfo(child, childNodeInfo);
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CharSequence childNodeDescription = null;
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if (AccessibilityEvaluationUtil.isSpeakingNode(childNodeInfo, child)
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&& !AccessibilityEvaluationUtil.isAccessibilityFocusable(childNodeInfo, child)) {
|
||||
childNodeDescription = getTalkbackDescription(child);
|
||||
}
|
||||
|
||||
if (!TextUtils.isEmpty(childNodeDescription)) {
|
||||
if (concatChildDescription.length() > 0) {
|
||||
concatChildDescription.append(separator);
|
||||
CharSequence childNodeDescription = getTalkbackDescription(child);
|
||||
if (!TextUtils.isEmpty(childNodeDescription)) {
|
||||
concatChildDescription.append(childNodeDescription + delimiter);
|
||||
}
|
||||
concatChildDescription.append(childNodeDescription);
|
||||
}
|
||||
childNodeInfo.recycle();
|
||||
}
|
||||
|
||||
return concatChildDescription.length() > 0 ? concatChildDescription.toString() : null;
|
||||
return removeFinalDelimiter(concatChildDescription);
|
||||
}
|
||||
|
||||
return null;
|
||||
@@ -458,7 +691,8 @@ public final class AccessibilityUtil {
|
||||
props
|
||||
.put("talkback-focusable", true)
|
||||
.put("talkback-focusable-reasons", getTalkbackFocusableReasons(view))
|
||||
.put("talkback-description", getTalkbackDescription(view));
|
||||
.put("talkback-output", getTalkbackDescription(view))
|
||||
.put("talkback-hint", getTalkbackHint(view));
|
||||
}
|
||||
}
|
||||
|
||||
@@ -500,10 +734,12 @@ public final class AccessibilityUtil {
|
||||
} else {
|
||||
String reason = getTalkbackFocusableReasons(view);
|
||||
CharSequence description = getTalkbackDescription(view);
|
||||
CharSequence hint = getTalkbackHint(view);
|
||||
props
|
||||
.put("talkback-focusable", true)
|
||||
.put("talkback-focusable-reasons", reason == null ? "" : reason)
|
||||
.put("talkback-description", description == null ? "" : description);
|
||||
.put("talkback-focusable-reasons", reason)
|
||||
.put("talkback-output", description)
|
||||
.put("talkback-hint", hint);
|
||||
}
|
||||
|
||||
SonarObject axNodeInfo = getAXNodeInfoProperties(view);
|
||||
|
||||
Reference in New Issue
Block a user