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近期开发上线一个常驻app，项目已上线，今天随笔记录一下静默安装相关内容。我分三篇静默安装（root版）、静默安装（无障碍版）、监听系统更新、卸载、安装。
先说说我的项目需求：要求app一直运行，通过指令进行自动安装并在安装成功后自动开启。行业人事都了解，非root权限不可能无声无息的完成此要求。我分两步完成了此功能开发。今天记录一下无障碍权限下实现自动安装app。
本文使用AccessibilityService执行系统安装程序自动安装指定文件。

一、自定义AccessibilityService并监听系统弹窗节点

/*** 自动安装服务*/
class AutoInstallService : AccessibilityService() {// 检查节点private fun checkNodes(node: AccessibilityNodeInfo):Boolean{if (node==null) {return false}if (node.className.isEmpty()) {return false}try {// 检查当前窗体if (node.className.equals("android.widget.Button")) {if (node.text.toString().isEmpty()) {return false}// 模拟点击if (node.text.equals("安装")||node.text.equals("完成")||node.text.equals("打开")||node.text.equals("确定")) {node.performAction(AccessibilityNodeInfo.ACTION_CLICK)return true}// 检查滑动节点} else if (node.className.equals("android.widget.ScrollView")){node.performAction(AccessibilityNodeInfo.ACTION_SCROLL_FORWARD)}// 检查下级窗体for (i in 0..node.childCount) {var child = node.getChild(i)if (checkNodes(child)) {return true}}}catch (e:Exception){e.printStackTrace()}return false}private var nodes:MutableMap<Int,Boolean> = LinkedHashMap()// 分析系统弹窗节点override fun onAccessibilityEvent(p0: AccessibilityEvent?) {// 监听系统窗体p0?.let {it.source?.let {obj->{var eventType = it.eventTypeif (eventType == AccessibilityEvent.TYPE_WINDOW_CONTENT_CHANGED || eventType == AccessibilityEvent.TYPE_NOTIFICATION_STATE_CHANGED) {// 监听窗体节点if (nodes.get(it.windowId) == null) {if (checkNodes(obj))nodes.put(it.windowId,true)}}}}}}// 销毁override fun onDestroy() {super.onDestroy()jumpToAccessServiceSetUi(this)}// 连接成功后退出设置页面override fun onServiceConnected() {super.onServiceConnected()// 连接成功，执行返回按钮performGlobalAction(GLOBAL_ACTION_BACK)Thread.sleep(500L)performGlobalAction(GLOBAL_ACTION_BACK)}override fun onInterrupt() {}// 跳转辅助服务fun jumpToAccessServiceSetUi(context:Context){context?.let {try {it.startActivity(Intent(Settings.ACTION_ACCESSIBILITY_SETTINGS))}catch (e:Exception){var intent = Intent(Settings.ACTION_ACCESSIBILITY_SETTINGS)intent.flags = Intent.FLAG_ACTIVITY_NEW_TASKit.startActivity(intent)e.printStackTrace()}}}/*** 检查辅助服务是否开启* @appcaliionId 应用id* @ct     设备id*/fun checkAccessServiceState(appcaliionId:String,ct:Context):Boolean{try {var state = Settings.Secure.getInt(ct.contentResolver, Settings.Secure.ACCESSIBILITY_ENABLED, 0)if (state != 1) {return false} else{var serviceName = Settings.Secure.getString(ct.contentResolver,Settings.Secure.ENABLED_ACCESSIBILITY_SERVICES)if (serviceName.isEmpty()) {return serviceName.contains(appcaliionId)}return false}} catch (e:Exception){e.printStackTrace()}return false}}

这是我自定的AccessibilityService，内部包含了跳转到开启AccessibilityService设置页面，分析系统弹窗节点，添加安装节点，自动执行。开启AccessibilityService服务，销毁后重新开启AccessibilityService。

2、AccessibilityService注册

在清单文件中注册自定义的AutoInstallService

 <service android:name="com.zhujing.nadedemospace.AutoInstallService"android:label="自动安装服务"android:exported="true"android:permission="android.permission.BIND_ACCESSIBILITY_SERVICE"><intent-filter><action android:name="android.accessibilityservice.AccessibilityService" /></intent-filter><meta-dataandroid:name="android.accessibilityservice"android:resource="@xml/accessibility_config" /></service>

accessibility_config自定义配置

<accessibility-servicexmlns:android="http://schemas.android.com/apk/res/android"android:accessibilityEventTypes="typeAllMask"android:accessibilityFlags="flagDefault"android:accessibilityFeedbackType="feedbackGeneric"android:canRetrieveWindowContent="true"/>

三、使用

// 开启无障碍findViewById<View>(R.id.open_accessbt).setOnClickListener {if (!AutoInstallService().checkAccessServiceState("com.zhujing.nadedemospace",this)) {AutoInstallService().jumpToAccessServiceSetUi(this)}}// 安装应用findViewById<View>(R.id.install_apk).setOnClickListener {//var intent = Intent(Intent.ACTION_GET_CONTENT)intent.type = "*/*"intent.addCategory(Intent.CATEGORY_OPENABLE)startActivityForResult(intent,100)}// 调用系统安装方法
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {super.onActivityResult(requestCode, resultCode, data)if (requestCode == 100 && resultCode == RESULT_OK && data?.data != null){var uri = data?.datavar intent = Intent(Intent.ACTION_VIEW)intent.flags = Intent.FLAG_ACTIVITY_NEW_TASKintent.setDataAndType(uri,"application/vnd.android.package-archive")startActivity(intent)}}

四、总结

我使用的是AccessibilityService无障碍服务实现自动安装的，严格意义上这并不算静默安装。andorid系统被限制的角度来说，这也是一种曲线救国的实现方式。能够满足，无需用户手动操作实现应用安装。欢迎各位指导……