kotlinのSAM変換

kotlinでSAMのCallbackを登録する方法

JAVAの場合

        btn.setPressReleaseCallback((state) -> {
            int discard = state ?
                Log.i(TAG, "aiueo")
                 : Log.i(TAG, "kakikukeko");
        });

Kotlinの場合

        btn?.setPressReleaseCallback({ pressed: Boolean ->
            {
                if (pressed) Log.i(TAG, "aiueo")
                else Log.i(TAG, "kakikukeko")
            }
        } as PressReleaseCallback)

ラベルも使える

        for (manager in managers) {
            val btn = findViewById<ExButton>(manager.value.buttonId)
            btn.setPressReleaseCallback({ pressed: Boolean ->
                callback@{
                    if (bashing(pressed)) return@callback

                    Thread {
                        val player: IMusicPlayer = getPlayer(manager)

                        if (pressed) {
                            when (manager.key) {
                                PlayerKind.JetPlayer -> player.play("/data/local/tmp/sample.midi")
                                else -> player.play("/data/local/tmp/sample.wav")
                            }
                        } else {
                            player.stop()
                        }
                        player.playState = !player.playState
                    }.start()
                }
            } as ExButton.PressReleaseCallback)
        }