Android开发中怎么实现一个屏蔽、拉黑与删除联系人的功能

package com.cxk.wechatdeletefail;import android.accessibilityservice.AccessibilityService;import android.content.Intent;import android.text.TextUtils;import android.view.accessibility.AccessibilityEvent;import android.view.accessibility.AccessibilityNodeInfo;import android.widget.Toast;public class DeleteFailService extends AccessibilityService {    private boolean isDeleteDialog;    private boolean isDefriendDialog;  @Override  public void onAccessibilityEvent(AccessibilityEvent event) {    int eventType = event.getEventType();    switch (eventType) {      //进入聊天页面会触发该事件      case AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED:        //获取当前聊天页面根布局        AccessibilityNodeInfo rootNode = getRootInActiveWindow();        //屏蔽微信"删除联系人"和"拉黑"功能        DeleteFail(rootNode);        break;    }  }    private void DeleteFail(AccessibilityNodeInfo rootNode) {    if(rootNode!=null){      for (int i = 0; i < rootNode.getChildCount(); i++) {        AccessibilityNodeInfo node = rootNode.getChild(i);        //判断是不是删除联系人弹出框        if("android.widget.TextView".equals(node.getClassName().toString())){          if(!TextUtils.isEmpty(node.getText())){            if(node.getText().toString().contains("将同时删除与该联系人的聊天记录")){              isDeleteDialog=true;            }          }        }        //判断是不是拉黑联系人弹出框        if("android.widget.TextView".equals(node.getClassName().toString())){          if(!TextUtils.isEmpty(node.getText())){            if(node.getText().toString().contains("你将不再收到对方的消息，并且你们相互看不到对方朋友圈的更新")){              isDefriendDialog=true;            }          }        }        //模拟点击取消按钮让对话框消失        if("android.widget.Button".equals(node.getClassName().toString())){          if(isDeleteDialog||isDefriendDialog){            if(!TextUtils.isEmpty(node.getText())){              if(node.getText().toString().equals("取消")){                node.performAction(AccessibilityNodeInfo.ACTION_CLICK);              }            }          }        }      }    }  }    @Override  public void onInterrupt() {    Toast.makeText(this, "我快被终结了啊-----", Toast.LENGTH_SHORT).show();  }    @Override  protected void onServiceConnected() {    Toast.makeText(this, "服务已开启", Toast.LENGTH_SHORT).show();    super.onServiceConnected();  }    @Override  public boolean onUnbind(Intent intent) {    Toast.makeText(this, "服务已被关闭", Toast.LENGTH_SHORT).show();    return super.onUnbind(intent);  }}