Kotlin实现Android系统悬浮窗详解
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2022-06-17 22:23:29
目录android 弹窗浅谈系统悬浮窗具体实现权限申请代码设计具体实现floatwindowservice 类floatwindowmanager 类floatwindowmanager 类代码flo...
android 弹窗浅谈
我们知道 android 弹窗中,有一类弹窗会在应用之外也显示,这是因为他被申明成了系统弹窗,除此之外还有2类弹窗分别是:子弹窗与应用弹窗。
应用弹窗:就是我们常规使用的 dialog 之类弹窗,依赖于应用的 activity;子弹窗:依赖于父窗口,比如 popupwindow;系统弹窗:比如状态栏、toast等,本文所讲的系统悬浮窗就是系统弹窗。
系统悬浮窗具体实现
权限申请
<uses-permission android:name="android.permission.system_alert_window" /> <uses-permission android:name="android.permission.system_overlay_window" />
代码设计
下面的包结构截图,简单展示了实现系统悬浮窗的代码结构,更复杂的业务需要可在此基础上进行扩展。
floatwindowservice:系统悬浮窗在此 service 中弹出;
floatwindowmanager:系统悬浮窗管理类;
floatlayout:系统悬浮窗布局;
homekeyobserverreceiver:
监听 home 键;
floatwindowutils:系统悬浮窗工具类。
具体实现
floatwindowservice 类
class floatwindowservice : service() { private val tag = floatwindowservice::class.java.simplename private var mfloatwindowmanager: floatwindowmanager? = null private var mhomekeyobserverreceiver: homekeyobserverreceiver? = null override fun oncreate() { tlogutils.i(tag, "oncreate: ") mfloatwindowmanager = floatwindowmanager(applicationcontext) mhomekeyobserverreceiver = homekeyobserverreceiver() registerreceiver(mhomekeyobserverreceiver, intentfilter(intent.action_close_system_dialogs)) mfloatwindowmanager!!.createwindow() } override fun onbind(intent: intent?): ibinder? { return null } override fun onstartcommand(intent: intent?, flags: int, startid: int): int { return start_not_sticky } override fun ondestroy() { tlogutils.i(tag, "ondestroy: ") mfloatwindowmanager?.removewindow() if (mhomekeyobserverreceiver != null) { unregisterreceiver(mhomekeyobserverreceiver) } } }
floatwindowmanager 类
包括系统悬浮窗的创建、显示、销毁(以及更新)。
public void addview(view view, viewgroup.layoutparams params); // 添加 view 到 window public void updateviewlayout(view view, viewgroup.layoutparams params); //更新 view 在 window 中的位置 public void removeview(view view); //删除 view
floatwindowmanager 类代码
class floatwindowmanager constructor(context: context) { var isshowing = false private val tag = floatwindowmanager::class.java.simplename private var mcontext: context = context private var mfloatlayout = floatlayout(mcontext) private var mlayoutparams: windowmanager.layoutparams? = null private var mwindowmanager: windowmanager = context.getsystemservice(context.window_service) as windowmanager fun createwindow() { tlogutils.i(tag, "createwindow: start...") // 对象配置操作使用apply,额外的处理使用also mlayoutparams = windowmanager.layoutparams().apply { type = if (build.version.sdk_int >= build.version_codes.o) { // android 8.0以后需要使用type_application_overlay,不允许使用以下窗口类型来在其他应用和窗口上方显示提醒窗口:type_phone、type_priority_phone、type_system_alert、type_system_overlay、type_system_error。 windowmanager.layoutparams.type_application_overlay } else { // 在android 8.0之前,悬浮窗口设置可以为type_phone,这种类型是用于提供用户交互操作的非应用窗口。 // 在api level = 23的时候,需要在android manifest.xml文件中声明权限system_alert_window才能在其他应用上绘制控件 windowmanager.layoutparams.type_phone } // 设置图片格式,效果为背景透明 format = pixelformat.rgba_8888 // 设置浮动窗口不可聚焦(实现操作除浮动窗口外的其他可见窗口的操作) flags = windowmanager.layoutparams.flag_not_focusable // 调整悬浮窗显示的停靠位置为右侧置顶 gravity = gravity.top or gravity.end width = 800 height = 200 x = 20 y = 40 } mwindowmanager.addview(mfloatlayout, mlayoutparams) tlogutils.i(tag, "createwindow: end...") isshowing = true } fun showwindow() { tlogutils.i(tag, "showwindow: isshowing = $isshowing") if (!isshowing) { if (mlayoutparams == null) { createwindow() } else { mwindowmanager.addview(mfloatlayout, mlayoutparams) isshowing = true } } } fun removewindow() { tlogutils.i(tag, "removewindow: isshowing = $isshowing") mwindowmanager.removeview(mfloatlayout) isshowing = false } }
floatlayout 类及其 layout
系统悬浮窗自定义view:floatlayout
class floatlayout @jvmoverloads constructor(context: context, attrs: attributeset? = null, defstyleattr: int = 0, defstyleres: int = 0) : constraintlayout(context, attrs, defstyleattr, defstyleres) { private var mtime: tcltextview private var mdistance: tcltextview private var mspeed: tcltextview private var mcalories: tcltextview init { val view = layoutinflater.from(context).inflate(r.layout.do_exercise_view_float_layout, this, true) mtime = view.findviewbyid(r.id.float_layout_tv_time) mdistance = view.findviewbyid(r.id.float_layout_tv_distance) mspeed = view.findviewbyid(r.id.float_layout_tv_speed) mcalories = view.findviewbyid(r.id.float_layout_tv_calories) } }
布局文件:float_layout_tv_time
homekeyobserverreceiver 类
class homekeyobserverreceiver : broadcastreceiver() { override fun onreceive(context: context?, intent: intent?) { try { val action = intent!!.action val reason = intent.getstringextra("reason") tlogutils.d(tag, "homekeyobserverreceiver: action = $action,reason = $reason") if (intent.action_close_system_dialogs == action && "homekey" == reason) { val keycode = intent.getintextra("keycode", keyevent.keycode_unknown) tlogutils.d(tag, "keycode = $keycode") context?.stopservice(intent(context, floatwindowservice::class.java)) } } catch (ex: exception) { ex.printstacktrace() } } companion object { private val tag = homekeyobserverreceiver::class.java.simplename } }
floatwindowutils 类
object floatwindowutils { const val request_float_code = 1000 private val tag = floatwindowutils::class.java.simplename /** * 判断service是否开启 */ fun isservicerunning(context: context, servicename: string): boolean { if (textutils.isempty(servicename)) { return false } val mymanager = context.getsystemservice(context.activity_service) as activitymanager val runningservice = mymanager.getrunningservices(1000) as arraylist<activitymanager.runningserviceinfo> runningservice.foreach { if (it.service.classname == servicename) { return true } } return false } /** * 检查悬浮窗权限是否开启 */ @suppresslint("newapi") fun checksuspendedwindowpermission(context: activity, block: () -> unit) { if (commonrompermissioncheck(context)) { block() } else { toast.maketext(context, "请开启悬浮窗权限", toast.length_short).show() context.startactivityforresult(intent(settings.action_manage_overlay_permission).apply { data = uri.parse("package:${context.packagename}") }, request_float_code) } } /** * 判断悬浮窗权限权限 */ fun commonrompermissioncheck(context: context?): boolean { var result = true if (build.version.sdk_int >= 23) { try { val clazz: class<*> = settings::class.java val candrawoverlays = clazz.getdeclaredmethod("candrawoverlays", context::class.java) result = candrawoverlays.invoke(null, context) as boolean } catch (e: exception) { tlogutils.e(tag, e) } } return result } }
总结
本文并未详细讨论系统悬浮窗的拖动功能,实现系统悬浮穿基本功能可以总结为以下几个步骤:
1. 声明及申请权限;
2. 构建悬浮窗需要的控件 service、receiver、manager、layout、util;
3. 使用 windowmanager 创建、显示、销毁(以及更新)layout。
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