ダイアログ | Android デベロッパー | Android Developers
まともに書くと割と長いので、コピペ用にいまさら書いておく。
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| class ConfirmDialogFragment: DialogFragment() { | |
| private lateinit var listener: ConfirmDialogListener | |
| interface ConfirmDialogListener { | |
| fun onPositiveClick(dialog: DialogFragment) | |
| fun onNegativeClick(dialog: DialogFragment) | |
| } | |
| override fun onAttach(context: Context) { | |
| super.onAttach(context) | |
| try { | |
| listener = context as ConfirmDialogListener | |
| } catch (e: ClassCastException) { | |
| throw ClassCastException("$context must implement NoticeDialogListener") | |
| } | |
| } | |
| override fun onCreateDialog(savedInstanceState: Bundle?): Dialog { | |
| val message = arguments?.getString(ARGS_MESSAGE) | |
| return activity?.let { | |
| AlertDialog.Builder(it) | |
| .setMessage(message) | |
| .setPositiveButton(android.R.string.ok) { _, _ -> | |
| listener.onPositiveClick(this) | |
| } | |
| .setNegativeButton(android.R.string.cancel) { _, _ -> | |
| listener.onNegativeClick(this) | |
| } | |
| .create() | |
| } ?: throw IllegalStateException("Activity cannot be null") | |
| } | |
| companion object { | |
| private const val ARGS_MESSAGE = "message" | |
| fun newInstance(message: String): ConfirmDialogFragment { | |
| val bundle = Bundle().apply { | |
| putString(ARGS_MESSAGE, message) | |
| } | |
| return ConfirmDialogFragment().apply { | |
| arguments = bundle | |
| } | |
| } | |
| } | |
| } |
by
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| class MainActivity : AppCompatActivity(), ConfirmDialogFragment.ConfirmDialogListener { | |
| override fun onCreate(savedInstanceState: Bundle?) { | |
| super.onCreate(savedInstanceState) | |
| setContentView(R.layout.activity_main) | |
| findViewById<Button>(R.id.button).setOnClickListener { | |
| showDialog() | |
| } | |
| } | |
| private fun showDialog() { | |
| val message = "This is a message." | |
| ConfirmDialogFragment.newInstance(message) | |
| .show(supportFragmentManager, ConfirmDialogFragment::class.simpleName) | |
| } | |
| override fun onPositiveClick(dialog: DialogFragment) { | |
| showToast("Positive clicked.") | |
| } | |
| override fun onNegativeClick(dialog: DialogFragment) { | |
| showToast("Negative clicked.") | |
| } | |
| private fun showToast(text: String) { | |
| Toast.makeText(this, text, Toast.LENGTH_SHORT).show() | |
| } | |
| } |
ダイアログの具の変更は、以下からコピペして、該当部分を書き換える。
【Android】パパっと使えるAlertDialog一覧 - Qiita
しかし、公式リファレンスて、読むの疲れない?
間違ってはないけど、何かが変じゃない?
