/*MainActivity中的代碼基本沒改變：*/
public class MainActivity extends AppCompatActivity {
  private final Intent mAccessibleIntent = new Intent(Settings.ACTION_ACCESSIBILITY_SETTINGS);
  private Button switchPlugin;
 
  @Overrideprotected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);  
    setContentView(R.layout.activity_main);  
    switchPlugin = (Button) findViewById(R.id.button_accessible);
    updateServiceStatus();
  }
 
  /*開啟插件的按鈕*/
  public void onButtonClicked(View view) {startActivity(mAccessibleIntent);}
 
  @Overrideprotected void onResume() {
    super.onResume();
    updateServiceStatus();
  }
}
 
  private void updateServiceStatus() {  
    boolean serviceEnabled = false;  
    AccessibilityManager accessibilityManager = (AccessibilityManager) getSystemService(Context.ACCESSIBILITY_SERVICE);
    List<AccessibilityServiceInfo> accessibilityServices = accessibilityManager.getEnabledAccessibilityServiceList(AccessibilityServiceInfo.FEEDBACK_GENERIC);  
    for (AccessibilityServiceInfo info : accessibilityServices) {   
      if (info.getId().equals(getPackageName() + "/.QQHongbaoService")) {     
        serviceEnabled = true;     
        break;    
       } 
     }
     if (serviceEnabled) {  
       switchPlugin.setText("關(guān)閉插件"); 
       getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
     } else {  
       switchPlugin.setText("開啟插件");  
       getWindow().clearFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);}
   }
}

public class QQHongbaoService extends AccessibilityService {
 private static final String WECHAT_OPEN_EN = "Open";  
 private static final String WECHAT_OPENED_EN = "You've opened";  
 private final static String QQ_DEFAULT_CLICK_OPEN = "點擊拆開"; 
 private final static String QQ_HONG_BAO_PASSWORD = "口令紅包";  
 private final static String QQ_CLICK_TO_PASTE_PASSWORD = "點擊輸入口令"; 
 private boolean mLuckyMoneyReceived;  
 private String lastFetchedHongbaoId = null;  
 private long lastFetchedTime = 0;  
 private static final int MAX_CACHE_TOLERANCE = 5000;  
 private AccessibilityNodeInfo rootNodeInfo;  
 private List<AccessibilityNodeInfo> mReceiveNode;
 
 @TargetApi(Build.VERSION_CODES.KITKAT)  
 public void recycle(AccessibilityNodeInfo info) {    
  if (info.getChildCount() == 0) {   
   /*這個if代碼的作用是：匹配“點擊輸入口令的節(jié)點，并點擊這個節(jié)點”*/  
   if(info.getText()!=null&&info.getText().toString().equals(QQ_CLICK_TO_PASTE_PASSWORD)) {
    info.getParent().performAction(AccessibilityNodeInfo.ACTION_CLICK);      
    }     
   /*這個if代碼的作用是：匹配文本編輯框后面的發(fā)送按鈕，并點擊發(fā)送口令*/
   if (info.getClassName().toString().equals("android.widget.Button") && info.getText().toString().equals("發(fā)送")) {        
    info.performAction(AccessibilityNodeInfo.ACTION_CLICK);      
    }    
  } else {      
    for (int i = 0; i < info.getChildCount(); i++) {      
      if (info.getChild(i) != null) {           
       recycle(info.getChild(i));       
      }      
     }   
    }  
  }
 
 @TargetApi(Build.VERSION_CODES.JELLY_BEAN)  
 @Override  
 public void onAccessibilityEvent(AccessibilityEvent event) {    
  this.rootNodeInfo = event.getSource();    
  if (rootNodeInfo == null) {      
   return;   
   }    
  mReceiveNode = null;   
  checkNodeInfo();    
  /* 如果已經(jīng)接收到紅包并且還沒有戳開 */   
  if (mLuckyMoneyReceived && (mReceiveNode != null)) {     
    int size = mReceiveNode.size();     
    if (size > 0) {       
      String id = getHongbaoText(mReceiveNode.get(size - 1));        
      long now = System.currentTimeMillis();       
      if (this.shouldReturn(id, now - lastFetchedTime))           
       return;       
      lastFetchedHongbaoId = id;        
      lastFetchedTime = now;        
      AccessibilityNodeInfo cellNode = mReceiveNode.get(size - 1);         
      if (cellNode.getText().toString().equals("口令紅包已拆開")) {          
       return;        
      }        
      cellNode.getParent().performAction(AccessibilityNodeInfo.ACTION_CLICK);      
      if (cellNode.getText().toString().equals(QQ_HONG_BAO_PASSWORD)) {
         AccessibilityNodeInfo rowNode = getRootInActiveWindow();         
      if (rowNode == null) {           
       Log.e(TAG, "noteInfo is　null");           
       return;          
      } else {          
         recycle(rowNode);         
      }        
     }
     mLuckyMoneyReceived = false;      
     }   
    } 
  }
 
 private void checkNodeInfo() {  
  if (rootNodeInfo == null) {   
    return;  
  }  
  /* 聊天會話窗口，遍歷節(jié)點匹配“點擊拆開”，“口令紅包”，“點擊輸入口令” */ 
  List<AccessibilityNodeInfo> nodes1 = this.findAccessibilityNodeInfosByTexts(this.rootNodeInfo, new String[]{QQ_DEFAULT_CLICK_OPEN, QQ_HONG_BAO_PASSWORD, QQ_CLICK_TO_PASTE_PASSWORD, "發(fā)送"});  
  if (!nodes1.isEmpty()) {   
    String nodeId = Integer.toHexString(System.identityHashCode(this.rootNodeInfo));    
    if (!nodeId.equals(lastFetchedHongbaoId)) {  
    mLuckyMoneyReceived = true;     
    mReceiveNode = nodes1;   
     }    return;  
   }
  }
 
 private String getHongbaoText(AccessibilityNodeInfo node) { 
   /* 獲取紅包上的文本 */  
   String content; 
   try {    
     AccessibilityNodeInfo i = node.getParent().getChild(0);    
     content = i.getText().toString(); 
     } catch (NullPointerException npe) { 
         return null;  
       }  
     return content;
  }
 
  private boolean shouldReturn(String id, long duration) { 
    // ID為空  
   if (id == null) return true;  
   // 名稱和緩存不一致 
   if (duration < MAX_CACHE_TOLERANCE && id.equals(lastFetchedHongbaoId)) {   
     return true; 
    } 
   return false;
  }
 
  private List<AccessibilityNodeInfo> findAccessibilityNodeInfosByTexts(AccessibilityNodeInfo nodeInfo, String[] texts) { 
    for (String text : texts) {  
      if (text == null) continue;   
      List<AccessibilityNodeInfo> nodes = nodeInfo.findAccessibilityNodeInfosByText(text);  
      if (!nodes.isEmpty()) {    
        if (text.equals(WECHAT_OPEN_EN) && !nodeInfo.findAccessibilityNodeInfosByText(WECHAT_OPENED_EN).isEmpty()) {       
          continue;    
        }      
        return nodes;   
      } 
     }  
    return new ArrayList<>();
  }
 
  @Override
  public void onInterrupt() {}
}