[英]Choose an image from gallery as Canvas background [Android]
在畫布上完成繪圖后,我已成功保存到畫廊,但現在我需要從廚房中打開一個圖像(例如我的舊繪圖)並將其用作背景,經過一番搜索后,沒有任何答案可以幫助我。 我已經開始嘗試這樣做,但是我如何實現它的任何建議或解決方案都會很棒。
有我的 Canvas 自定義視圖:
(READ 和 WRITE 權限已在另一個類中授予和處理)
var drawingColor: Int = ResourcesCompat.getColor(resources, R.color.colorBlack, null)
var strokeDrawWidth: Float = 12f
private var path = Path()
private val paths = ArrayList<Triple<Path, Int, Float>>()
private val undonePaths = ArrayList<Triple<Path, Int, Float>>()
private val extraCanvas: Canvas? = null
private var bitmapBackground: Bitmap? = null
private var motionTouchEventX = 0f
private var motionTouchEventY = 0f
private var currentX = 0f
private var currentY = 0f
private val touchTolerance = ViewConfiguration.get(context).scaledTouchSlop
private val paint = Paint().apply {
color = drawingColor
isAntiAlias = true
isDither = true
style = Paint.Style.STROKE
strokeJoin = Paint.Join.ROUND
strokeCap = Paint.Cap.ROUND
strokeWidth = strokeDrawWidth
}
fun loadCanvasBackground(bitmap: Bitmap) {
bitmapBackground = bitmap
invalidate()
}
fun saveCanvasDrawing() {
canvasCustomView.isDrawingCacheEnabled = true
val extraBitmap: Bitmap = canvasCustomView.drawingCache
MediaStore.Images.Media.insertImage(context.contentResolver, extraBitmap, "drawing", "Paint R")
}
fun resetCanvasDrawing() {
path.reset()
paths.clear()
invalidate()
}
fun undoCanvasDrawing() {
if (paths.size > 0) {
undonePaths.add(paths.removeAt(paths.size - 1))
invalidate()
} else {
Log.d("UNDO_ERROR", "Something went wrong with UNDO action")
}
}
fun redoCanvasDrawing() {
if (undonePaths.size > 0) {
paths.add(undonePaths.removeAt(undonePaths.size - 1))
invalidate()
} else {
Log.d("REDO_ERROR", "Something went wrong with REDO action")
}
}
override fun onDraw(canvas: Canvas?) {
super.onDraw(canvas)
if (bitmapBackground != null) {
extraCanvas?.drawBitmap(bitmapBackground!!, 0f, 0f, paint)
}
for (p in paths) {
paint.strokeWidth = p.third
paint.color = p.second
canvas?.drawPath(p.first, paint)
}
paint.color = drawingColor
paint.strokeWidth = strokeDrawWidth
canvas?.drawPath(path, paint)
}
override fun onTouchEvent(event: MotionEvent?): Boolean {
if (event == null)
return false
motionTouchEventX = event.x
motionTouchEventY = event.y
when (event.action) {
MotionEvent.ACTION_DOWN -> {
undonePaths.clear()
path.reset()
path.moveTo(motionTouchEventX, motionTouchEventY)
currentX = motionTouchEventX
currentY = motionTouchEventY
invalidate()
}
MotionEvent.ACTION_MOVE -> {
val distanceX = abs(motionTouchEventX - currentX)
val distanceY = abs(motionTouchEventY - currentY)
if (distanceX >= touchTolerance || distanceY >= touchTolerance) {
path.quadTo(
currentX,
currentY,
(motionTouchEventX + currentX) / 2,
(currentY + motionTouchEventY) / 2
)
currentX = motionTouchEventX
currentY = motionTouchEventY
}
invalidate()
}
MotionEvent.ACTION_UP -> {
path.lineTo(currentX, currentY)
extraCanvas?.drawPath(path, paint)
paths.add(Triple(path, drawingColor, strokeDrawWidth))
path = Path()
}
}
return true
}
override fun isSaveEnabled(): Boolean {
return true
}
所以沒有人回答,經過一些搜索和實驗,我得到了可行的解決方案,如果您遇到相同的情況,請使用它或根據您的需要進行調整
(答案基於我的問題中的代碼 - 所以如果你錯過了一些依賴項,請檢查它)
companion object {
private const val GALLERY_REQUEST_CODE = 102
}
private fun pickFromGallery() {
val intent = Intent(Intent.ACTION_PICK)
intent.type = "image/*"
val imageTypes = arrayOf("image/jpeg", "image/png")
intent.putExtra(Intent.EXTRA_MIME_TYPES, imageTypes)
startActivityForResult(intent, GALLERY_REQUEST_CODE)
}
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
super.onActivityResult(requestCode, resultCode, data)
if (requestCode == GALLERY_REQUEST_CODE) {
if (resultCode == Activity.RESULT_OK) {
val uri: Uri? = data?.data
if (uri != null) {
val bitmap = MediaStore.Images.Media.getBitmap(this.contentResolver, uri)
canvasCustomView.loadCanvasBackground(bitmap)
}
}
}
}
override fun onDraw(canvas: Canvas?) {
if (bitmapBackground != null) {
canvas?.drawBitmap(bitmapBackground!!, 0f, 0f, paint)
}
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