Android微信抢红包功能的实现原理浅析

@Override 
public void onAccessibilityEvent(AccessibilityEvent event) { 
  //获取事件类型 
  int type = event.getEventType(); 
  //在这里进行事件过滤 
   
} 

<service 
  android:name=".QiangHongBaoService" 
  android:label="@string/app_name" 
  android:enabled="true" 
  android:exported="true" 
  android:permission="android.permission.BIND_ACCESSIBILITY_SERVICE"> 
  <intent-filter android:priority="1000"> 
    <action android:name="android.accessibilityservice.AccessibilityService"/> 
  </intent-filter> 
  <meta-data 
    android:name="android.accessibilityservice" 
    android:resource="@xml/envelope_service_config"/> 
</service> 

<?xml version="1.0" encoding="utf-8"?> 
<accessibility-service xmlns:android="http://schemas.android.com/apk/res/android" 
            android:accessibilityEventTypes="typeNotificationStateChanged|typeWindowStateChanged" 
            android:accessibilityFeedbackType="feedbackGeneric" 
            android:accessibilityFlags="flagDefault" 
            android:canRetrieveWindowContent="true" 
            android:description="@string/accessibility_description"            android:notificationTimeout="100"           android:packageNames="com.tencent.mm" /> 
记得加上网络权限：<uses-permission Android:name="android.permission.VIBRATE" />

/** 
 * 从知消息栏打开微信聊天界面 
 * @param event 
 */ 
private void openNotification(AccessibilityEvent event) { 
  if (event.getParcelableData() != null && event.getParcelableData() instanceof Notification) { 
    Notification notification = (Notification) event.getParcelableData(); 
    PendingIntent pendingIntent = notification.contentIntent; 
    try { 
      pendingIntent.send(); 
    } catch (PendingIntent.CanceledException e) { 
      e.printStackTrace(); 
    } 
  } 
} 

/** 
 * 点中红包 
 */ 
@TargetApi(Build.VERSION_CODES.JELLY_BEAN) 
private void clickHongBao() { 
  AccessibilityNodeInfo nodeInfo = getRootInActiveWindow(); 
  if (nodeInfo == null) { 
    return; 
  } 
  List<AccessibilityNodeInfo> list = nodeInfo.findAccessibilityNodeInfosByText(ENVLOP_OPEN_KEY); 
  if (list.isEmpty()) { 
    list = nodeInfo.findAccessibilityNodeInfosByText(ENVELOPE_TEXT_KEY); 
    for (AccessibilityNodeInfo n : list) { 
      n.performAction(AccessibilityNodeInfo.ACTION_CLICK); 
      break; 
    } 
  } else { 
    //最新的红包领起 
    for (int i = list.size() - 1; i >= 0; i--) { 
      AccessibilityNodeInfo parent = list.get(i).getParent(); 
      if (parent != null) { 
        parent.performAction(AccessibilityNodeInfo.ACTION_CLICK); 
        break; 
      } 
    } 
  } 
} 

/** 
 *拆红包 
 */ 
@TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR2) 
private void openHongBao() { 
  AccessibilityNodeInfo rootInActiveWindow = getRootInActiveWindow(); 
  if (rootInActiveWindow == null) { 
    return; 
  } 
  List<AccessibilityNodeInfo> nodeInfos = rootInActiveWindow.findAccessibilityNodeInfosByViewId(ENVLOP_CHECKED_KEY); 
  for (AccessibilityNodeInfo nodeInfo : nodeInfos) { 
    nodeInfo.performAction(AccessibilityNodeInfo.ACTION_CLICK); 
  } 
} 

//打开系统设置中辅助功能 
Intent intent = new Intent(android.provider.Settings.ACTION_ACCESSIBILITY_SETTINGS); 
startActivity(intent);