Question

我想使用AccessibilityDelegateCompat来调整AccessibilityEvent的内容。

我已经看到了各种示例，但是我不确定为什么我不能在输出端附加声音。

这是完整的代码

@Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_more, container, false);

        ViewCompat.setAccessibilityDelegate(mProfilePic,new AccessibilityDelegateCompat(){
            @Override
            public void sendAccessibilityEvent(View host, int eventType) {
                super.sendAccessibilityEvent(host, eventType);
            }

            @Override
            public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) {
                event.getText().add("TEST");
                super.sendAccessibilityEventUnchecked(host, event);
            }

            @Override
            public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) {
                event.getText().add("TEST");
                return super.dispatchPopulateAccessibilityEvent(host, event);
            }

            @Override
            public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) {
                event.getText().add("TEST");
                super.onPopulateAccessibilityEvent(host, event);
                event.getText().add("TEST");
            }

            @Override
            public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) {
                event.getText().add("TEST");
                super.onInitializeAccessibilityEvent(host, event);
            }

            @Override
            public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfoCompat info) {
                super.onInitializeAccessibilityNodeInfo(host, info);
            }

            @Override
            public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child, AccessibilityEvent event) {
                event.getText().add("TEST");
                return super.onRequestSendAccessibilityEvent(host, child, event);
            }

            @Override
            public AccessibilityNodeProviderCompat getAccessibilityNodeProvider(View host) {
                return super.getAccessibilityNodeProvider(host);
            }

            @Override
            public boolean performAccessibilityAction(View host, int action, Bundle args) {
                return super.performAccessibilityAction(host, action, args);
            }
        });

        return view;
    }

如我所见，我尝试在各个地方添加我的内容。请注意，mProfilePic具有以XML设置的内容描述。我想用代码添加到现有的内容描述中。

Answer 1

找到了似乎有效的解决方案。我在带有Google Talkback的Nexus 6p和使用Samsung Voice的Samsung S7上进行了测试。

    ViewCompat.setAccessibilityDelegate(mProfilePic, new AccessibilityDelegateCompat() {

     private boolean didPerformAccessibilityAction = false

     @Override
     public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfoCompat info) {
      super.onInitializeAccessibilityNodeInfo(host, info);
      if (didPerformAccessibilityAction) {
       didPerformAccessibilityAction = false
       info.contentDescription = "MY NEW CONTENT"
      }
     }

     @Override
     public boolean performAccessibilityAction(View host, int action, Bundle args) {
      didPerformAccessibilityAction = super.performAccessibilityAction(host, action, args)
      return didPerformAccessibilityAction
     }
    });

onInitializeAccessibilityNodeInfo在最后一个之前被调用可访问性事件已处理。在最后一个阶段，再次设置要发布的内容描述。

因此，任何其他委托方法所做的更改都无效，因为onInitializeAccessibilityNodeInfo会覆盖它。

每个孩子都将调用此方法来初始化节点信息，因此在调用修饰符之前，我们需要一个阻止程序，直到发生真正的可访问性事件为止，这样我们才等到performAccessibilityAction似乎在真实事件上被调用在我们进行修改之前。

如何使用辅助功能代表来调整语音？

1 个答案: