AccessibilityService初探

1.官网地址 https://developer.android.com/reference/android/accessibilityservice/AccessibilityService.html

谷歌官网意思是：辅助功能服务只能用于帮助残障人士使用Android设备和应用程序。

2. 创建服务类
   编写自己的服务类,需要继承AccessibilityService类.其中要实现onAccessibilityEvent(AccessibilityEvent event)及onInterruput()两个重要的方法:

@SuppressLint("Registered")
public class MyAccessibilityService extends AccessibilityService {

  @Override
  public void onAccessibilityEvent(AccessibilityEvent accessibilityEvent) {
    int eventType = accessibilityEvent.getEventType();
    switch (eventType) {
      case AccessibilityEvent.TYPE_VIEW_CLICKED:
        Log.e("MyAccessibilityService","View被点击了");
        Log.e("MyAccessibilityService","我点击了:"+accessibilityEvent.getText());
        Log.e("MyAccessibilityService","当前应用的包名是:"+accessibilityEvent.getPackageName()+accessibilityEvent.getClassName());
        break;
      case AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED:
        //界面文字改动
        break;
    }
    //过滤下只需要监听的包名
    if ("xxxxx".equals(accessibilityEvent.getClassName().toString())){
      openPacket();
      Log.e("MyAccessibilityService","当前应用的包名是:"+accessibilityEvent.getPackageName()+"===="+accessibilityEvent.getClassName()+"==="+    accessibilityEvent.getWindowId());

    }

  }

  @Override
  public void onInterrupt() {

  }

  /**
   * 模拟点击
   */
  @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR2)
  private void openPacket() {
    AccessibilityNodeInfo nodeInfo = getRootInActiveWindow();
    if (nodeInfo != null) {
//      List<AccessibilityNodeInfo> list = nodeInfo.findAccessibilityNodeInfosByText("测试");

      List<AccessibilityNodeInfo> list = nodeInfo.findAccessibilityNodeInfosByViewId("xxxxx:id/rl_action");

      for (AccessibilityNodeInfo item : list) {
        item.performAction(AccessibilityNodeInfo.ACTION_CLICK);
      }
    }
  }

}

在 onAccessibilityEvent中做我们需要做的事情比如单击，双击，滑动等等，当我们拦截到是需要监听的应用事件时候，通过AccessibilityNodeInfo 的findAccessibilityNodeInfosByText和findAccessibilityNodeInfosByViewId，来找到需要执行事件的控件findAccessibilityNodeInfosByText就是控件上的tex文本，findAccessibilityNodeInfosByViewId不能直接填写控件id，需要使用 image.png

dumpview 来查看获取到我们要查找的id才行，这里只会显示能debug的程序的进程。

3.xml配置

image.png

在res目录下面创建一个xml用来设置AccessibilityService的额外信息

<?xml version="1.0" encoding="utf-8"?>
<accessibility-service xmlns:android="http://schemas.android.com/apk/res/android"

  android:accessibilityEventTypes="typeAllMask"
  android:accessibilityFeedbackType="feedbackGeneric"
  android:accessibilityFlags="flagDefault"
  android:canRetrieveWindowContent="true"
  android:notificationTimeout="100"
  android:description="@string/accessibillity"
  />

4.在AndroidManifest上配置

 <service
      android:name=".MyAccessibilityService"
      android:permission="android.permission.BIND_ACCESSIBILITY_SERVICE">
      <intent-filter>
        <action android:name="android.accessibilityservice.AccessibilityService"/>
      </intent-filter>
      <meta-data
        android:name="android.accessibilityservice"
        android:resource="@xml/accessibility"/>
    </service>

按照上面的配置就可以执行一个简单的辅助功能了。