andrew
03/31/2022, 3:06 PMpointerInteropFilter
on the knob views in conjunction with pointerInput
on a Canvas
view underneath. Multitouch breaks with a NPE. I have a small sample pasted below the stack trace, and some context explaining why I need to do things this way2022-03-31 11:07:30.166 15447-15447/com.stratisiot.mobile E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.stratisiot.mobile, PID: 15447
java.lang.NullPointerException
at androidx.compose.foundation.gestures.DragGestureDetectorKt.awaitDragOrCancellation-rnUCldI(DragGestureDetector.kt:844)
at androidx.compose.foundation.gestures.DragGestureDetectorKt$awaitDragOrCancellation$1.invokeSuspend(Unknown Source:15)
at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
at kotlinx.coroutines.DispatchedTaskKt.resume(DispatchedTask.kt:178)
at kotlinx.coroutines.DispatchedTaskKt.dispatch(DispatchedTask.kt:166)
at kotlinx.coroutines.CancellableContinuationImpl.dispatchResume(CancellableContinuationImpl.kt:397)
at kotlinx.coroutines.CancellableContinuationImpl.resumeImpl(CancellableContinuationImpl.kt:431)
at kotlinx.coroutines.CancellableContinuationImpl.resumeImpl$default(CancellableContinuationImpl.kt:420)
at kotlinx.coroutines.CancellableContinuationImpl.resumeWith(CancellableContinuationImpl.kt:328)
at androidx.compose.ui.input.pointer.SuspendingPointerInputFilter$PointerEventHandlerCoroutine.offerPointerEvent(SuspendingPointerInputFilter.kt:509)
at androidx.compose.ui.input.pointer.SuspendingPointerInputFilter.dispatchPointerEvent(SuspendingPointerInputFilter.kt:404)
at androidx.compose.ui.input.pointer.SuspendingPointerInputFilter.onPointerEvent-H0pRuoY(SuspendingPointerInputFilter.kt:417)
at androidx.compose.ui.input.pointer.Node.dispatchMainEventPass(HitPathTracker.kt:310)
at androidx.compose.ui.input.pointer.Node.dispatchMainEventPass(HitPathTracker.kt:297)
at androidx.compose.ui.input.pointer.NodeParent.dispatchMainEventPass(HitPathTracker.kt:179)
at androidx.compose.ui.input.pointer.HitPathTracker.dispatchChanges(HitPathTracker.kt:98)
at androidx.compose.ui.input.pointer.PointerInputEventProcessor.process-BIzXfog(PointerInputEventProcessor.kt:80)
at androidx.compose.ui.platform.AndroidComposeView.sendMotionEvent-8iAsVTc(AndroidComposeView.android.kt:1223)
at androidx.compose.ui.platform.AndroidComposeView.handleMotionEvent-8iAsVTc(AndroidComposeView.android.kt:1173)
at androidx.compose.ui.platform.AndroidComposeView.dispatchTouchEvent(AndroidComposeView.android.kt:1112)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3120)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2801)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3120)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2801)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3120)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2801)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3120)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2801)
at com.android.internal.policy.DecorView.superDispatchTouchEvent(DecorView.java:498)
at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1890)
at android.app.Activity.dispatchTouchEvent(Activity.java:4202)
at com.android.internal.policy.DecorView.dispatchTouchEvent(DecorView.java:456)
at android.view.View.dispatchPointerEvent(View.java:14858)
at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:6446)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:6247)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5725)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:5782)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:5748)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:5913)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:5756)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:5970)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5729)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:5782)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:5748)
2022-03-31 11:07:30.167 15447-15447/com.stratisiot.mobile E/AndroidRuntime: at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:5756)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5729)
at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:8696)
at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:8647)
at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:8616)
at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:8819)
at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:259)
at android.view.InputEventReceiver.nativeConsumeBatchedInputEvents(Native Method)
at android.view.InputEventReceiver.consumeBatchedInputEvents(InputEventReceiver.java:239)
at android.view.ViewRootImpl.doConsumeBatchedInput(ViewRootImpl.java:8776)
at android.view.ViewRootImpl$ConsumeBatchedInputRunnable.run(ViewRootImpl.java:8905)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1037)
at android.view.Choreographer.doCallbacks(Choreographer.java:845)
at android.view.Choreographer.doFrame(Choreographer.java:772)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:1022)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loopOnce(Looper.java:201)
at android.os.Looper.loop(Looper.java:288)
at android.app.ActivityThread.main(ActivityThread.java:7870)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)
@Composable
fun Reproduction(modifier: Modifier = Modifier) {
BoxWithConstraints(modifier) {
Canvas(Modifier.fillMaxSize().pointerInput(Unit) {
detectDragGestures(
onDrag = { _, dragAmount -> println(dragAmount) }
)
}) {
drawCircle(Color.Red, size.width / 3)
}
Box(Modifier.size(48.dp).background(Color.Yellow).pointerInteropFilter { event ->
when (event.action) {
MotionEvent.ACTION_DOWN -> { println("DOWN") }
}
false
})
}
}
@Composable
@Preview
private fun Reproduction_Preview() {
Reproduction(Modifier.padding(48.dp).aspectRatio(1F))
}
jossiwolf
04/01/2022, 9:37 AMandrew
04/01/2022, 9:30 PMjossiwolf
04/12/2022, 11:28 AMandrew
04/12/2022, 1:30 PM