本篇内容介绍了“Kotlin如何实现Android系统悬浮窗”的有关知识，在实际案例的操作过程中，不少人都会遇到这样的困境，接下来就让小编带领大家学习一下如何处理这些情况吧！希望大家仔细阅读，能够学有所成！
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 Windowpublic void updateViewLayout(View view, ViewGroup.LayoutParams params); //更新 View 在 Window 中的位置public void removeView(View view); //删除 ViewFloatWindowManager 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 = $keyCode") context?.stopService(Intent(context, FloatWindowService::class.java)) } } catch (ex: Exception) { ex.printStackTrace() } } companion object { private val TAG = HomeKeyObserverReceiver::class.java.simpleName } }FloatWindowUtils 类
object FloatWindowUtils { const val REQUEST_FLOAT_CODE = 1000 private val TAG = FloatWindowUtils::class.java.simpleName fun isServiceRunning(context: Context, ServiceName: String): Boolean { if (TextUtils.isEmpty(ServiceName)) { return false } val myManager = context.getSystemService(Context.ACTIVITY_SERVICE) as ActivityManager val runningService = myManager.getRunningServices(1000) as ArrayList<ActivityManager.RunningServiceInfo> runningService.forEach { if (it.service.className == ServiceName) { return true } } return false } @SuppressLint("NewApi") fun checkSuspendedWindowPermission(context: Activity, block: () -> Unit) { if (commonROMPermissionCheck(context)) { block() } else { Toast.makeText(context, "请开启悬浮窗权限", Toast.LENGTH_SHORT).show() context.startActivityForResult(Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION).apply { data = Uri.parse("package:${context.packageName}") }, REQUEST_FLOAT_CODE) } } 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 } }“Kotlin如何实现Android系统悬浮窗”的内容就介绍到这里了，感谢大家的阅读。如果想了解更多行业相关的知识可以关注编程网网站，小编将为大家输出更多高质量的实用文章！
