Talkback问题汇总
导航页面界面与读屏内容不一致移除引导页面
导航页面
界面与读屏内容不一致
现象：界面显示在page2，tts输出内容为page1+page2，返回上一页现象雷同修改
talkback-master\compositor\src\main\res\raw\compositor.json
"TYPE_VIEW_FOCUSED": {
//modify>>>
//"ttsOutput": "%event_description",
"ttsOutput": "",
"ttsAddToHistory": true,
// From FallbackFormatter
// TODO: Delete porting comments.
"earcon": {
"if": "$event.sourceIsNull",
"then": "@raw/focus_actionable"
},
"haptic": {
"if": "$event.sourceIsNull",
"then": "@array/view_focused_or_selected_pattern"
}
},
由于json是全局配置文件，修改有风险，继而java中做判断条件修改
talkback-master\compositor\src\main\java\com\google\android\accessibility\compositor\Compositor.java
private void handleEvent(
int event,
@Nullable EventId eventId,
ParseTree.VariableDelegate delegate,
HandleEventOptions options) {
...
// custom for training >>>
CharSequence ttsOutput ="";
if (eventObject!= null) {
Log.i(TAG, "handleEvent: " + eventObject.toString());
}
if (eventObject!= null
&& eventObject.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED
&& "com.android.talkback".equals(eventObject.getPackageName())){
ttsOutput ="";
}else {
ttsOutput = mParseTree.parseEventToString(event, OUTPUT_TTS_OUTPUT, delegate);
}
CharSequence ttsOutput = mParseTree.parseEventToString(event, OUTPUT_TTS_OUTPUT, delegate);
Log.i(TAG, "handleEvent: ttsOutput="+ttsOutput);
...
}
talkback-master\talkback\src\main\java\com\google\android\accessibility\talkback\eventprocessor\ProcessorScreen.java
此处修改可以避免title重复读
@Override
protected boolean allowAnnounce(AccessibilityEvent event) {
// If the user performs a cursor control(copy, paste, start selection mode, etc) in the
// talkback context menu and lands back to the edit text, a TYPE_WINDOWS_CHANGED and a
// TYPE_WINDOW_STATE_CHANGED events will be fired. We should skip these two events to
// avoid announcing the window title.
boolean allowAnnounce = true;
if (event.getEventType() == AccessibilityEvent.TYPE_WINDOWS_CHANGED
&& EventState.getInstance()
.checkAndClearRecentFlag(
EventState.EVENT_SKIP_WINDOWS_CHANGED_PROCESSING_AFTER_CURSOR_CONTROL)) {
allowAnnounce = false;
}
if (event.getEventType() == AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED
&& EventState.getInstance()
.checkAndClearRecentFlag(
EventState.EVENT_SKIP_WINDOW_STATE_CHANGED_PROCESSING_AFTER_CURSOR_CONTROL)) {
allowAnnounce = false;
}
Log.i(TAG, "allowAnnounce: "+allowAnnounce);
//modify>>>>>
if (WindowUtils.rootChildMatchesResId(service, TrainingActivity.ROOT_RES_ID)){
Log.i(TAG, "allowAnnounce: is TrainingActivity>>>");
allowAnnounce = false;
}
return allowAnnounce;
}
talkback-master\talkback\src\main\java\com\google\android\accessibility\talkback\training\TrainingFragment.java
修改后辅助功能的焦点框会直接选中界面外布局而非内部子布局
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedState) {
final View view = inflater.inflate(R.layout.training_fragment_name, container, false);
pageLayout = view.findViewById(R.id.training_page);
@Nullable PageId pageId = (PageId) getArguments().get(EXTRA_PAGE);
if (pageId == null) {
LogUtils.e(TAG, "Cannot create view because no page ID.");
return view;
}
page = PageConfig.getPage(pageId);
if (page == null) {
LogUtils.e(TAG, "Cannot create view because unknown PageId. [%s]", pageId.name());
return view;
}
addView(inflater, container);
//modify>>>>>
//pageLayout.setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_AUTO);
pageLayout.setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS);
if (FeatureSupport.isWatch(getContext())) {
// Support rotary input.
view.requestFocus();
}
return view;
}
talkback-master\talkback\src\main\java\com\google\android\accessibility\talkback\utils\DiagnosticOverlayControllerImpl.java
以上修改后在返回上一页时会出现辅助功能的焦点框丢失，继而添加以下修改
/**
* Receives and appends Feedback object to log controller. Feedback objects are filtered for swipe
* gestures.
*/
public void appendLog(Feedback feedback) {
Feedback.@Nullable Part failover =
(feedback.failovers() == null || feedback.failovers().size() < 1
? null
: feedback.failovers().get(0));
if (failover == null) {
return;
}
// Filter for FOCUS and FOCUS DIRECTION actions,
// which mark beg/end of swipe gesture + associated focus
if (failover.focus() == null
&& failover.focusDirection() == null
&& failover.scroll() == null) {
return;
}
/** Check to make sure eventID isn't null before checking for gestures */
if (!this.enabled
|| feedback.eventId() == null
|| highlightOverlay == null
|| diagnosticOverlay == null) {
return;
}
/**
* Clear/recycle traversed/unfocused nodes when window changes/scrolls to new screen because
* usually {@link FocusProcessorForLogicalNavigation} tells when clear/recycle, but with new
* screen change/scroll, we must call {@link
* DiagnosticOverlayControllerImpl#clearAndRecycleCollectionNodes} from here
*/
if (feedback.eventId().getEventSubtype() == AccessibilityEvent.TYPE_WINDOWS_CHANGED
|| feedback.eventId().getEventSubtype() == AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED
|| failover.scroll() != null) {
Log.i(TAG, "appendLog: >>>>>>>>>>>>>>>>>>>>>>");
//modify>>>>>需要添加判断条件
//clearAndRecycleCollectionNodes(/* recycleFocusedNode= */ false);
//highlightOverlay.clearHighlight();
}
移除引导页面
找到对应的显示界面数组后跟踪，修改： talkback-master\talkback\src\main\java\com\google\android\accessibility\talkback\TalkBackService.java
@Override
protected void onServiceConnected() {
LogUtils.v(TAG, "System bound to service.");
...
//modify>>>>
if (false && !FeatureSupport.isTv(getApplicationContext())
&& !FeatureSupport.isWatch(getApplicationContext())) {
OnboardingInitiator.showOnboarding91IfNecessary(this);
}
...
}