Android 警报对话框故障

Question

我无法理解这种奇怪的行为。

这在某些设备上随机发生，并且总是在 Honor 9 STF-L9（gif 动画上的那个）上发生。

如果您查看此 gif，您可以看到从拾取选择器返回时，对话框再次可见，即使没有人显示它（通过单击它查看完整图像 gif 以查看视频） ).

我有一个 Activity 应用程序（我使用新的 Navigation jetpack 组件）并且我的 MainActivity 中有一个自定义 AlertDialog:

class MainActivity : AppCompatActivity() {

    private lateinit var appBarConfiguration: AppBarConfiguration
    private lateinit var binding: ActivityMainBinding

    private lateinit var inflater: LayoutInflater
    private lateinit var dialogView: View
    private lateinit var messageTextView: TextView
    private val progressHud: AlertDialog by lazy {
        val dialogBuilder =
            AlertDialog.Builder(this, R.style.ProgressHudTheme)

        messageTextView.visibility = View.GONE
        dialogBuilder.setView(dialogView)
        dialogBuilder.setCancelable(false)
        dialogBuilder.create()
    }

    fun showProgressHud(message: String?) {
        messageTextView.visibility = View.GONE
        message?.let {
            messageTextView.text = it
            messageTextView.visibility = View.VISIBLE
        }
        progressHud.show()
    }

    fun hideProgressHud() {
        progressHud.hide()
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        binding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)

        setSupportActionBar(binding.toolbar)

        val navController = findNavController(R.id.nav_host_fragment_content_main)
        appBarConfiguration = AppBarConfiguration(navController.graph)
        setupActionBarWithNavController(navController, appBarConfiguration)

        binding.fab.setOnClickListener { view ->
            dispatchChoosePictureFromGalleryAppIntentIntent()
        }

        setupProgressHud()
    }

    private fun dispatchChoosePictureFromGalleryAppIntentIntent() {
        Intent(
            Intent.ACTION_PICK,
            MediaStore.Images.Media.EXTERNAL_CONTENT_URI
        ).apply {
            putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true)
            resolveActivity(packageManager)?.also {
                requestImageChooserLauncher.launch(this)
            }
        }
    }


    private var requestImageChooserLauncher = registerForActivityResult(
        ActivityResultContracts.StartActivityForResult()
    ) { result ->
        val resultCode = result.resultCode
        val data = result.data
        // TODO ...
    }

    private fun setupProgressHud() {
        inflater = getSystemService(Context.LAYOUT_INFLATER_SERVICE) as LayoutInflater
        dialogView = inflater.inflate(R.layout.progress_hud, null)
        messageTextView = dialogView.findViewById(R.id.progressHudTextView)
    }

    override fun onCreateOptionsMenu(menu: Menu): Boolean {
        // Inflate the menu; this adds items to the action bar if it is present.
        menuInflater.inflate(R.menu.menu_main, menu)
        return true
    }

    override fun onOptionsItemSelected(item: MenuItem): Boolean {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        return when (item.itemId) {
            R.id.action_settings -> true
            else -> super.onOptionsItemSelected(item)
        }
    }

    override fun onSupportNavigateUp(): Boolean {
        val navController = findNavController(R.id.nav_host_fragment_content_main)
        return navController.navigateUp(appBarConfiguration)
                || super.onSupportNavigateUp()
    }
}

对话框在 FirstFragment 中以这种方式显示和隐藏：

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)

    binding.buttonFirst.setOnClickListener {
        (activity as? MainActivity)?.showProgressHud("Loading...")
        Handler().postDelayed({
            findNavController().navigate(R.id.action_FirstFragment_to_SecondFragment)
            (activity as? MainActivity)?.hideProgressHud()
        }, 5000)
    }
}

您可以在此处找到完整的工作示例：https://github.com/shadowsheep1/android-alert-dialog-glitch

我还是不明白为什么会这样。

如果有人以前遇到过这个问题或有任何线索，我们将不胜感激。

Answer 1

尝试替换

progressHud.hide()

来自

progressHud.dismiss().

那应该没问题。

使用 dismiss() 而不是 hide() 有一个更重要的原因：使用 hide() 可能会导致 Leaked Window Error，因为它并没有真正删除视图，只是隐藏了它，然后如果你完成 activity 可能会导致泄漏。

Android 警报对话框故障

Android alert dialog glitch

android

kotlin

android-alertdialog