[如何在Android中创建像Viber（或类似Facebook Meesenger的东西）那样的头部气泡？

Question

我已经创建了head气泡，该气泡在28之前的旧API上都可以完美运行。在最新的API 29上，我无法从后台在Tap应用上打开。

这里是头部气泡截图

Screenshot of head bubble when an app is in background

这是我当前的代码...

override fun onCreate() {
      super.onCreate()
      mCallHeadView = 
      LayoutInflater.from(this).inflate(R.layout.call_head, null);
      var params: WindowManager.LayoutParams = WindowManager.LayoutParams(
         WindowManager.LayoutParams.WRAP_CONTENT,
         WindowManager.LayoutParams.WRAP_CONTENT,
         LayoutParams.TYPE_APPLICATION_OVERLAY,
         WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
         PixelFormat.TRANSLUCENT
      )
      //val params = LayoutParams(LayoutParams.WRAP_CONTENT, 
     LayoutParams.WRAP_CONTENT, LayoutParams.TYPE_PHONE, 
     LayoutParams.FLAG_NOT_FOCUSABLE, PixelFormat.TRANSLUCENT)
      params.gravity = Gravity.TOP or  Gravity.END
      params.x = 0
      params.y = 270

      mWindowManager = getSystemService(WINDOW_SERVICE) as? WindowManager;
      if( mWindowManager != null){
         mWindowManager!!.addView(mCallHeadView, params);
      }
      var closeButton = mCallHeadView!!.findViewById<ConstraintLayout> . 
      (R.id.callHead)
      closeButton.setOnClickListener {
         val i = Intent()
         i.setClass(this,MainActivity::class.java)
         i.flags = Intent.FLAG_ACTIVITY_NEW_TASK
         startActivity(i)
         stopSelf()

      }

Answer 1

由于在新版本的Android（28或更高版本）中实现Bubbles有所不同因此，请尝试关注Android Documentation或任何新教程，例如this