4.11

安卓无障碍功能开发指南
为残障用户提供无障碍支持是现代应用的重要要求，以下是 Java 实现的关键技术：

1. 为视图添加内容描述
   java
   ImageView imageView = findViewById(R.id.imageView);
   imageView.setContentDescription("Profile Photo");

2. 自定义无障碍操作
   java
   button.setOnTouchListener(new View.OnTouchListener() {
   @Override
   public boolean onTouch(View v, MotionEvent event) {
   if (event.getAction() == MotionEvent.ACTION_UP) {
   v.performAccessibilityAction(AccessibilityNodeInfo.ACTION_CLICK, null);
   return true;
   }
   return false;
   }
   });

3. 实现 AccessibilityService
   java
   public class MyAccessibilityService extends AccessibilityService {
   @Override
   public void onAccessibilityEvent(AccessibilityEvent event) {
   // 处理无障碍事件
   }

   @Override
   public void onInterrupt() {
   // 服务中断时调用
   }

   @Override
   protected void onServiceConnected() {
   super.onServiceConnected();
   AccessibilityServiceInfo info = new AccessibilityServiceInfo();
   info.eventTypes = AccessibilityEvent.TYPE_VIEW_CLICKED;
   info.feedbackType = AccessibilityServiceInfo.FEEDBACK_SPOKEN;
   setServiceInfo(info);
   }
   }