Android “地图视图”拖动时速度非常慢

这是我的应用程序的架构

MainActivity只是将MainFragment加载到其容器中的骨架

MainFragment包含一个按钮，单击时添加MapsFragment

MapsFragment加载mapview。它还将在其顶部显示一个自定义大小的对话框片段，并设置

WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL

以使该对话框片段成为非模态

如果从onResume中启动MapsFragment mapview，它将正常工作。 然而，当拖动时，如果

从按钮的onClick启动，或

从onResume启动，延迟至少1ms

这是我的录像

在11点之前，一切正常，因为它是从onResume启动的。 12秒后，mapview变得非常滞后，因为它是从onClick启动的

如果MapsFragment不启动对话框片段，则mapview将正常工作

看起来，如果延迟至少1ms，则map将延迟。 请帮忙，因为我已经被困在这三天了。 谢谢

这是我的密码

class MapsActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_maps)

        supportFragmentManager.beginTransaction()
            .add(R.id.fragment_container, MainFragment.newInstance())
            .commit()
    }
}

//-------------------------

class MainFragment : DialogFragment(), View.OnClickListener {

    companion object {
        fun newInstance() = MainFragment()
    }

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        return inflater.inflate(R.layout.main_fragment, container, false)
    }

    override fun onResume() {
        super.onResume()

        // if passing 0, 0, map will work fine, if passing at least 1 ms, map will be slow
        object : CountDownTimer(0, 0) {

            override fun onTick(millisUntilFinished: Long) {
                var left = millisUntilFinished / 1000
                button2.setText("$left")
            }

            override fun onFinish() {
                activity!!.supportFragmentManager.beginTransaction()
                .add(R.id.fragment_container, MapsFragment.newInstance())
                .addToBackStack(null)
                .commit()
            }

        }.start()
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
        button2.setOnClickListener(this)
    }

    override fun onClick(v: View?) {
        activity!!.supportFragmentManager.beginTransaction()
        .add(R.id.fragment_container, MapsFragment.newInstance())
        .addToBackStack(null)
        .commit()
    }
}

class MapsFragment : DialogFragment() {

    companion object {
        fun newInstance() = MapsFragment()
    }

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
        return inflater.inflate(R.layout.maps_fragment, container, false)
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
 AddCitiesFragment.newInstance().show(activity!!.supportFragmentManager)
    }
}

//-------------------------

class MainFragment : DialogFragment(), View.OnClickListener {

    companion object {
        fun newInstance() = MainFragment()
    }

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        return inflater.inflate(R.layout.main_fragment, container, false)
    }

    override fun onResume() {
        super.onResume()

        // if passing 0, 0, map will work fine, if passing at least 1 ms, map will be slow
        object : CountDownTimer(0, 0) {

            override fun onTick(millisUntilFinished: Long) {
                var left = millisUntilFinished / 1000
                button2.setText("$left")
            }

            override fun onFinish() {
                activity!!.supportFragmentManager.beginTransaction()
                .add(R.id.fragment_container, MapsFragment.newInstance())
                .addToBackStack(null)
                .commit()
            }

        }.start()
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
        button2.setOnClickListener(this)
    }

    override fun onClick(v: View?) {
        activity!!.supportFragmentManager.beginTransaction()
        .add(R.id.fragment_container, MapsFragment.newInstance())
        .addToBackStack(null)
        .commit()
    }
}

class MapsFragment : DialogFragment() {

    companion object {
        fun newInstance() = MapsFragment()
    }

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
        return inflater.inflate(R.layout.maps_fragment, container, false)
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
 AddCitiesFragment.newInstance().show(activity!!.supportFragmentManager)
    }
}