无法将暂停功能添加到我的 AlertDialog 中的 setOnClickListener

Question

songToAddDialog() 方法中的 add_button 不会将我暂停的方法 positiveButtonClick() 接受到其 setOnClickListener 中。我已经看了好几个小时了，但我不知道该怎么做。

// Check the GenreKey of the current playlist to use later to create the Song
    suspend fun playlistGenreCheck(id: Long): Long {
        val playlist = dataSource.getPlaylist(id)
        val playlistGenre = playlist.playlistGenre
        return playlistGenre
    }

    // When you press the add button in the AlertDialog it will add the song to the database and closes the AlertDialog afterwards
    suspend fun positiveButtonClick(builder: AlertDialog){
        val song = Song(title = builder.dialogTitleEt.toString(), artist = builder.dialogArtistEt.toString(), playlist = arguments.playlistKey, key = builder.dialogKeyEt.toString(), genre = playlistGenreCheck(arguments.playlistKey))
        songsModel.addSong(song)
        builder.dismiss()
    }

    // When you press the cancel button the AlertDialog will bet dismissed
    fun negativeButtonClick(builder: AlertDialog){
        builder.dismiss()
    }

    // This creates the AlertDialog and adds the two functions above to the buttons
    fun songToAddDialog(){
        val mDialogView = LayoutInflater.from(requireContext()).inflate(R.layout.add_song_dialog, null)
        val mBuilder = AlertDialog.Builder(requireContext()).setView(mDialogView).setTitle("Add a Song")
        val mAlertDialog = mBuilder.show()

        mDialogView.add_button.setOnClickListener{positiveButtonClick(mAlertDialog)}
        mDialogView.cancel_button.setOnClickListener{negativeButtonClick(mAlertDialog)}
    }

    // Makes the add-button inside the songslistview observable
    songsModel.addButton.observe(viewLifecycleOwner, androidx.lifecycle.Observer{
        if (it) {
            songToAddDialog()
        }
    })

Answer 1

Suspend 函数只能从 CoroutineScope 调用。如果你有 lifecycle 依赖然后使用：

mDialogView.add_button.setOnClickListener{

      lifecyclescope.launch{

         positiveButtonClick(mAlertDialog)
      
      }
}

如果您没有生命周期依赖项，那么像这样调用 CoroutineScope 也应该有效：

mDialogView.add_button.setOnClickListener{

      CoroutineScope(Dispatchers.IO).launch{

         positiveButtonClick(mAlertDialog)
      
      }
}

如果您对此仍有问题，请告诉我:)

无法将暂停功能添加到我的 AlertDialog 中的 setOnClickListener

Can't add a suspended function to a setOnClickListener in my AlertDialog

kotlin

onclicklistener

kotlin-coroutines