微信抢红包主要用到AccessibilityService，该服务需要用户手动到辅助功能里面授权，下面直接粘贴源码，先看Activity，主要是跳转到辅助功能界面，让用户开启辅助功能的服务：

public class MainActivity extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

View btn = findViewById(R.id.open_help_btn);

btn.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

Intent intent = new Intent(

android.provider.Settings.ACTION_ACCESSIBILITY_SETTINGS);

startActivity(intent);

}

});

}

}

下面看服务的使用，需要配置相关参数，如：

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" />

再看服务的声明：

android:name="com.yongfei.hongbao.AccService"

android:permission="android.permission.BIND_ACCESSIBILITY_SERVICE" >

android:name="android.accessibilityservice"

android:resource="@xml/service_config" />

最后看抢红包功能的实现：

public class AccService extends AccessibilityService {

private static final String NOTIFICATION_HONGBAO = "[微信红包]";

private static final String HONGBAO_MSG = "微信红包";

private static final String LAUNCHER_UI = "com.tencent.mm.ui.LauncherUI";

private static final String OPEN_MONEY_UI = "com.tencent.mm.plugin.luckymoney.ui.LuckyMoneyReceiveUI";

private static final String OPEN_ID = "com.tencent.mm:id/ba_";

private boolean mIsFromNotification = false;

// 标记在微信主界面时收到红包消息

private boolean mIsMsgWindow = true;

private WakeLock mWakeLock;

private KeyguardManager mKeyguardManager;

private KeyguardLock mKeyguardLock;

private boolean mIsOperationLock = false;

@Override

public void onAccessibilityEvent(AccessibilityEvent event) {

int eventType = event.getEventType();

if (eventType == AccessibilityEvent.TYPE_NOTIFICATION_STATE_CHANGED) {

List text = event.getText();

if (!text.isEmpty()) {

for (CharSequence item : text) {

String t = String.valueOf(item);

System.out.println("zyf通知内容：" + t);

if (t.contains(NOTIFICATION_HONGBAO)) {

mIsFromNotification = true;

mIsMsgWindow = true;

if (isKeyguardLocked()) {

wakeAndUnlock(true);

}

openNotification(event);

break;

}

}

}

} else if (eventType == AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED) {

mIsMsgWindow = false;

// 只有从通知栏进入聊天界面的才点击红包消息/拆红包

// 因为拆完红包返回时也会引起窗口变化

if (mIsFromNotification) {

windowStateChanged(event);

return;

}

// 聊天界面手动点击红包消息时，自动拆包

if (OPEN_MONEY_UI.equals(event.getClassName())) {

// 拆红包界面，点击拆红包

openHongBao();

}

}

}

private void wakeAndUnlock(boolean unlock) {

if (unlock) {

PowerManager manager = (PowerManager) getSystemService(Context.POWER_SERVICE);

mWakeLock = manager.newWakeLock(PowerManager.ACQUIRE_CAUSES_WAKEUP

| PowerManager.SCREEN_BRIGHT_WAKE_LOCK, "money");

mWakeLock.acquire();

if (mKeyguardManager != null) {

mKeyguardLock = mKeyguardManager.newKeyguardLock("unLock");

mKeyguardLock.disableKeyguard();

mIsOperationLock = true;

}

} else {

if (mKeyguardLock != null) {

mKeyguardLock.reenableKeyguard();

mIsOperationLock = false;

}

if (mWakeLock != null) {

mWakeLock.release();

}

}

}

private boolean isKeyguardLocked() {

mKeyguardManager = (KeyguardManager) getSystemService(Context.KEYGUARD_SERVICE);

return mKeyguardManager.isKeyguardLocked();

}

/**

* 界面变化

*

* @param event

*/

private void windowStateChanged(AccessibilityEvent event) {

if (LAUNCHER_UI.equals(event.getClassName())) {

// 主界面或聊天界面，点击红包消息

clickHongBaoMsg();

} else if (OPEN_MONEY_UI.equals(event.getClassName())) {

// 拆红包界面，点击拆红包

openHongBao();

}

}

/**

* 拆红包

*/

private void openHongBao() {

AccessibilityNodeInfo nodeInfo = getRootInActiveWindow();

if (nodeInfo == null) {

System.out.println("zyf openHongBao is null");

return;

}

// 抢别人发的红包

List openId = nodeInfo

.findAccessibilityNodeInfosByViewId(OPEN_ID);

if (openId != null && openId.size() > 0) {

openId.get(0).performAction(AccessibilityNodeInfo.ACTION_CLICK);

if (mIsOperationLock) {

wakeAndUnlock(false);

}

}

// 抢没抢到红包都要把变量赋为false，以便后续继续拆从通知栏进来的红包消息

mIsFromNotification = false;

}

/**

* 点击红包消息

*/

private void clickHongBaoMsg() {

AccessibilityNodeInfo nodeInfo = getRootInActiveWindow();

if (nodeInfo == null) {

System.out.println("zyf rootwindow is null");

return;

}

List list = nodeInfo

.findAccessibilityNodeInfosByText(HONGBAO_MSG);

if (list.size() >= 1) {

// 只拆最后一个红包

AccessibilityNodeInfo item = list.get(list.size() - 1);

AccessibilityNodeInfo parent = item.getParent();

parent.performAction(AccessibilityNodeInfo.ACTION_CLICK);

}

}

/**

* 打开通知栏消息

*

* @param event

*/

private void openNotification(AccessibilityEvent event) {

if (event.getParcelableData() == null

|| !(event.getParcelableData() instanceof Notification)) {

return;

}

// 获取通知栏的意图并打开

Notification notification = (Notification) event.getParcelableData();

PendingIntent pendingIntent = notification.contentIntent;

try {

pendingIntent.send();

// 只有接收到通知并且窗口没有变化时才需要点击红包消息

// 因为此时是在微信主界面

if (mIsMsgWindow) {

clickHongBaoMsg();

}

} catch (CanceledException e) {

e.printStackTrace();

}

}

@Override

public void onInterrupt() {

System.out.println("zyf 服务中断了");

}

@Override

protected void onServiceConnected() {

super.onServiceConnected();

System.out.println("zyf 服务连接成功");

}

}

由于上面用到wakelock和解锁/锁屏功能，故需要在配置文件中添加相关权限：

另外，需要把apk加入到各种白名单，因为应用被杀后辅助功能会自动收回该应用的授权。

另外，手机静音时该服务是不可用的。

上面代码是基于微信6.3.23版本实现的，不同版本id可能会不同。