import android.content.Context
import android.os.SystemClock
import android.util.AttributeSet
import android.view.MotionEvent
import android.widget.Button
import kotlinx.coroutines.*
import kotlinx.coroutines.flow.MutableSharedFlow
import kotlinx.coroutines.flow.collect
import kotlinx.coroutines.flow.flow
import kotlin.math.max
class RollBackButton @JvmOverloads constructor(
context: Context,
attrs: AttributeSet? = null,
defStyleAttr: Int = 0
) : Button(context, attrs, defStyleAttr) {
// 配置参数
var longPressDuration = 500L // 默认500毫秒
var repeatInterval = 150L // 默认150毫秒
// 事件回调接口
interface OnRollBackButtonListener {
fun onLongPress()
fun onShortPress()
fun onRelease()
}
private var listener: OnRollBackButtonListener? = null
private var job: Job? = null
private val eventFlow = MutableSharedFlow<Event>()
// 设置事件监听器
fun setOnRollBackButtonListener(listener: OnRollBackButtonListener) {
this.listener = listener
// 启动协程来收集事件
CoroutineScope(Dispatchers.Main).launch {
eventFlow.collect { event ->
when (event) {
is Event.LongPress -> listener?.onLongPress()
is Event.ShortPress -> listener?.onShortPress()
is Event.Release -> listener?.onRelease()
}
}
}
}
private sealed class Event {
object LongPress : Event()
object ShortPress : Event()
object Release : Event()
}
override fun onTouchEvent(event: MotionEvent): Boolean {
when (event.action) {
MotionEvent.ACTION_DOWN -> {
job?.cancel() // 取消之前的长按任务
job = CoroutineScope(Dispatchers.Main).launch {
val startTime = SystemClock.elapsedRealtime()
delay(longPressDuration)
if (SystemClock.elapsedRealtime() - startTime >= longPressDuration) {
// 长按事件
eventFlow.emit(Event.LongPress)
// 重复触发长按事件
while (SystemClock.elapsedRealtime() - startTime >= longPressDuration) {
delay(repeatInterval)
eventFlow.emit(Event.LongPress)
}
}
}
return true
}
MotionEvent.ACTION_UP, MotionEvent.ACTION_CANCEL -> {
job?.cancel()
val elapsedTime = SystemClock.elapsedRealtime() - event.downTime
if (elapsedTime < longPressDuration) {
eventFlow.emit(Event.ShortPress)
}
eventFlow.emit(Event.Release)
return true
}
}
return super.onTouchEvent(event)
}
}
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
val rollBackButton: RollBackButton = findViewById(R.id.roll_back_button)
rollBackButton.setOnRollBackButtonListener(object : RollBackButton.OnRollBackButtonListener {
override fun onLongPress() {
// 处理长按事件
Toast.makeText(this@MainActivity, "Long press detected", Toast.LENGTH_SHORT).show()
}
override fun onShortPress() {
// 处理按下时间过短事件
Toast.makeText(this@MainActivity, "Short press detected", Toast.LENGTH_SHORT).show()
}
override fun onRelease() {
// 处理松手事件
Toast.makeText(this@MainActivity, "Release detected", Toast.LENGTH_SHORT).show()
}
})
}
}
