版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/tingfengzheshuo/article/details/79146860
前段时间突然对抢红包原理感兴趣，网上找了些相关资料，但是网上资料同质化严重，也只能做参考了，自己上手后还填了一些坑
原理
基于AccessibilityService服务类，这个类的使用网上资料很多，我就不详说了。后台监听微信，如果发现被唤醒，就检查通知，如果是红包通知就转入微信。
show u my code
package nodec.bsssss.com.grabredpacketc.Service;
import android.accessibilityservice.AccessibilityService;
import android.app.Notification;
import android.app.PendingIntent;
import android.util.Log;
import android.view.accessibility.AccessibilityEvent;
import android.view.accessibility.AccessibilityNodeInfo;
import android.widget.Toast;
import java.util.List;
import java.util.Timer;
import java.util.TimerTask;
/**
* Created by shijg on 2018/1/4.
*/
public class GrabService extends AccessibilityService {
private static final String TAG = "Plus";
private static final String FLOW = "flow";
private int serviceState = -1;
private static final int FLAG_BACKGROUND = 100;
private static final int FLAG_CHAT_LIST = 200;
private static final int FLAG_CHAT_DETAIL = 300;
private static final int FLAG_PACKET_RECEIVE = 500;
private static final int FLAG_PACKET_DETAIL = 600;
private static final int FLAG_IGNORE = 400;
private int behavior = -1;
private static final int FLAG_CAUGHT = 500;
private static final int FLAG_FOUND = 900;
private static final int FLAG_OPENING = 600;
private static final int FLAG_OPENED = 700;
private static final int FLAG_INS = 800;
private Timer timer = null;
private int start = -1;
private static final int START_BACKGROUND = 100;
private static final int START_LIST = 200;
private static final int START_DETAIL = 300;
private boolean back = false;
@Override
public void onAccessibilityEvent(AccessibilityEvent event) {
int eventType = event.getEventType();
String className = event.getClassName().toString();
if (back)return;
switch (eventType) {
case AccessibilityEvent.TYPE_NOTIFICATION_STATE_CHANGED:// 监听微信通知
handleNotification(event);
break;
case AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED:
if (start == START_BACKGROUND && serviceState == FLAG_BACKGROUND && behavior == FLAG_FOUND){// 兼容一些设备
AccessibilityNodeInfo node = getPacket();
while (node != null){
if (node.isClickable()){
serviceState = FLAG_CHAT_DETAIL;
start = START_BACKGROUND;// 从后台唤醒标识
behavior = FLAG_CAUGHT;
node.performAction(AccessibilityNodeInfo.ACTION_CLICK);
break;
}
node = node.getParent();
}
return;
}
// 拆开红包界面
if ("com.tencent.mm.plugin.luckymoney.ui.LuckyMoneyReceiveUI".equals(className)){
// findATarget = 0;
// TODO
timer = new Timer(true);
timer.schedule(new TimerTask() {
@Override
public void run() {
openPacket(getRootInActiveWindow());
behavior = FLAG_OPENED;
serviceState = FLAG_PACKET_DETAIL;
}
},300);
return;
}
// 红包详情界面
// if (serviceState == FLAG_PACKET_DETAIL && behavior == FLAG_OPENED && "com.tencent.mm.plugin.luckymoney.ui.LuckyMoneyDetailUI".equals(className) ){
if ("com.tencent.mm.plugin.luckymoney.ui.LuckyMoneyDetailUI".equals(className) ){
close(getRootInActiveWindow());
back = true;
serviceState = FLAG_CHAT_DETAIL;
behavior = FLAG_INS;
if (start == START_BACKGROUND || start == START_LIST){
timer = new Timer(true);
timer.schedule(new TimerTask() {
@Override
public void run() {
close(getRootInActiveWindow());
serviceState = FLAG_CHAT_LIST;
back = false;
timer.cancel();
}
},400);
}else {
back = false;
}
return;
}
break;
case AccessibilityEvent.TYPE_WINDOW_CONTENT_CHANGED:
// 未发现红包时监听聊天列表
if (behavior == FLAG_INS && className.equals("android.widget.ImageView")){
// if (serviceState == FLAG_CHAT_LIST && behavior == FLAG_INS && className.equals("android.widget.ImageView")){
AccessibilityNodeInfo node = recycleContains(getRootInActiveWindow());
if(node != null){
while (node != null){
if (node.isClickable()){
serviceState = FLAG_CHAT_DETAIL;
start = START_LIST;
behavior = FLAG_FOUND;
node.performAction(AccessibilityNodeInfo.ACTION_CLICK);
break;
}
node = node.getParent();
}
return;
}else {
// 监听聊天详情页面
AccessibilityNodeInfo node1 = getPacket();
while (node1 != null){
if (node1.isClickable()){
serviceState = FLAG_CHAT_DETAIL;
start = START_DETAIL;
behavior = FLAG_FOUND;
node1.performAction(AccessibilityNodeInfo.ACTION_CLICK);
break;
}
node1 = node1.getParent();
}
return;
}
}
// // 打开在列表中发现的红包
if (serviceState == FLAG_CHAT_DETAIL && start == START_LIST && className.equals("android.widget.ImageView") && behavior == FLAG_FOUND){
AccessibilityNodeInfo node = getPacket();
while (node != null){
if (node.isClickable()){
serviceState = FLAG_CHAT_DETAIL;
start = START_LIST;
behavior = FLAG_CAUGHT;
node.performAction(AccessibilityNodeInfo.ACTION_CLICK);
break;
}
node = node.getParent();
}
return;
}
break;
}
}
@Override
public void onInterrupt() {
}
public void handleNotification(AccessibilityEvent event){
List<CharSequence> texts = event.getText();
if (!texts.isEmpty()) {
for (CharSequence text : texts) {
String content = text.toString();
//如果微信红包的提示信息,则模拟点击进入相应的聊天窗口
if (content.contains("[微信红包]")) {
if (event.getParcelableData() != null && event.getParcelableData() instanceof Notification) {
Notification notification = (Notification) event.getParcelableData();
PendingIntent pendingIntent = notification.contentIntent;
try {
behavior = FLAG_FOUND;
serviceState = FLAG_BACKGROUND;
start = START_BACKGROUND;
pendingIntent.send();
} catch (PendingIntent.CanceledException e) {
e.printStackTrace();
}
}
}
}
}
}
@Override
protected void onServiceConnected() {
super.onServiceConnected();
Toast.makeText(getApplicationContext(),"服务成功开启",Toast.LENGTH_SHORT).show();
}
private void close(AccessibilityNodeInfo rootNode) {
AccessibilityNodeInfo closeNode = getCloseNode(rootNode);
if (closeNode != null) {
closeNode.performAction(AccessibilityNodeInfo.ACTION_CLICK);
closeNode.recycle();
}
}
/**
* 模拟点击,拆开红包
*/
private void openPacket(AccessibilityNodeInfo nodeInfo) {
if (nodeInfo != null) {
AccessibilityNodeInfo node = getOpenButton(nodeInfo);
if (node != null){
node.performAction(AccessibilityNodeInfo.ACTION_CLICK);
node.recycle();
}
nodeInfo.recycle();
}
}
private AccessibilityNodeInfo getPacket() {
AccessibilityNodeInfo rootNode = getRootInActiveWindow();
return recycle(rootNode,"领取红包");
}
private boolean checkPacketFromList(AccessibilityNodeInfo rootNode){
Log.d(TAG,"checkPacketFromList");
return false;
}
public AccessibilityNodeInfo recycleContains(AccessibilityNodeInfo node){
if (node.getChildCount() == 0){
if (node.getText() != null){
if (node.getText().toString().contains("[微信红包]")){
return node;
}
}
}else {
for (int i = 0; i < node.getChildCount(); i++) {
if (node.getChild(i) != null) {
AccessibilityNodeInfo agent = recycleContains(node.getChild(i));
if (agent != null)return agent;
}
}
}
return null;
}
public AccessibilityNodeInfo recycle(AccessibilityNodeInfo node,String text) {
if (node.getChildCount() == 0) {
if (node.getText() != null) {
if (text.equals(node.getText().toString())) {
return node;
}
}
} else {
for (int i = node.getChildCount() - 1; i > -1; i--) {
if (node.getChild(i) != null) {
AccessibilityNodeInfo agent = recycle(node.getChild(i),text);
if (agent != null)return agent;
}
}
}
return null;
}
private AccessibilityNodeInfo getOpenButton(AccessibilityNodeInfo node){
if (node.getChildCount() == 0) {
if ("android.widget.Button".equals(node.getClassName().toString())) {
if (node.getText() != null)Log.d(FLOW,node.getText().toString());
return node;
}
} else {
for (int i = 0; i < node.getChildCount(); i++) {
if (node.getChild(i) != null) {
AccessibilityNodeInfo agent = getOpenButton(node.getChild(i));
if (agent != null)return agent;
}
}
}
return null;
}
private AccessibilityNodeInfo getCloseNode(AccessibilityNodeInfo node){
if (node.getChildCount() > 0){
if ("android.widget.LinearLayout".equals(node.getClassName().toString()) && node.isClickable() && hasImageViewChild(node)){
return node;
}else {
for (int i = 0; i < node.getChildCount(); i++) {
AccessibilityNodeInfo agent = getCloseNode(node.getChild(i));
if (agent != null)return agent;
}
}
}
return null;
}
private boolean hasImageViewChild(AccessibilityNodeInfo node){
return node.getChildCount() > 0 && "android.widget.ImageView".equals(node.getChild(0).getClassName().toString());
}
}
<?xml version="1.0" encoding="utf-8"?>
<accessibility-service xmlns:android="http://schemas.android.com/apk/res/android"
android:accessibilityEventTypes="typeNotificationStateChanged|typeWindowStateChanged|typeWindowContentChanged"
android:accessibilityFeedbackType="feedbackGeneric"
android:accessibilityFlags="flagRetrieveInteractiveWindows|flagIncludeNotImportantViews"
android:canRetrieveWindowContent="true"
android:notificationTimeout="100"
android:packageNames="com.tencent.mm" />代码分析
抢红包可以分为三种场景，
1，微信在后台时
2，在微信聊天列表时
3，在微信聊天详情时
1
微信在后台时，收到红包会通知，来通知会收到
AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED 类型的window状态变更，拿到通知文本，如果包含微信红包字样就认为是有红包，转入微信（这有个坑，就是如果有人发文字‘微信红包’而不是真的发红包也会跳进去）
然后检测view树，找到红包，点击
2
3
2，3放在一起说是因为我一起处理了，微信如果有红包存在展示的其实是一张图片，所以我监听了className为android.widget.ImageView的AccessibilityEvent.TYPE_WINDOW_CONTENT_CHANGED的类型通知
具体代码不多说了，量不多，自己看看就明白了，说说坑
网上很多代码是说在注册AccessibilityService时，把accessibilityFlags设为flagDefault，这会导致无法监听到一些窗口变化
，我设置为
有时窗口会发生捕获不到目标View的情况，所以延迟了一点时间再捕获
服务类的accessibilityEventType设为feedbackGeneric有时会导致获取根rootView为null，我设置为
flagRetrieveInteractiveWindows|flagIncludeNotImportantViews
有时窗口会发生捕获不到目标View的情况，所以延迟了一点时间再捕获
服务类的accessibilityEventType设为feedbackGeneric有时会导致获取根rootView为null，我设置为
typeNotificationStateChanged|typeWindowStateChanged|typeWindowContentChanged
github项目地址