大家好，希望你没事
我在我的非常基本的绘图 android 应用程序中有一个小问题我有一个图像按钮来更改 PaintColor 但问题是：颜色仅在毫秒内发生变化，然后它回到 DrawingView 类中定义的基本颜色，其他问题是所有的previeus绘图线更改为newColor并回到基本的 这是我的2个课程这是非常基本的项目
DrawingView.kt
package com.wissewassim.kid_drawing_app
import android.content.Context
import android.graphics.*
import android.util.AttributeSet
import android.util.TypedValue
import android.view.MotionEvent
import android.view.View
import kotlin.collections.ArrayList
class DrawingView (context : Context, attrs :AttributeSet) : View(context,attrs) {
private var mDrawPath : CustomPath? = null
private var mCanvasBitmap : Bitmap? = null
private var mDrawPaint : Paint? = null
private var mCanvasPaint : Paint? = null
private var mBrishSize : Float = 0.toFloat()
private var color : Int = Color.CYAN
private var canvas : Canvas? = null
private val paths = ArrayList<CustomPath>()
init {
setUpDrawing()
}
private fun setUpDrawing(){
/** we give it to drawPath to draw in the screen */
mDrawPaint = Paint()
/**we use it to draw on the scren using the Paint that returnned from customPath.class */
mDrawPath = CustomPath(color,mBrishSize)
/**define the style and the color and the edges of the line of the draw (attributes) */
mDrawPaint!!.color = color
mDrawPaint!!.style = Paint.Style.STROKE
mDrawPaint!!.strokeCap = Paint.Cap.ROUND
mDrawPaint!!.strokeJoin = Paint.Join.ROUND
/**we use it to draw the canvas on the view with PaintFlag
* PaintFlag: how does this canvas render in the screen*/
mCanvasPaint= Paint(Paint.DITHER_FLAG)
/**the size of the brush we use it to draw lines */
mBrishSize = 20.toFloat()
}
/** put canvas it the view each time the screen size changed
* or an view was added to the hierarchy
* */
override fun onSizeChanged(w: Int, h: Int, oldw: Int, oldh: Int) {
super.onSizeChanged(w, h, oldw, oldh)
mCanvasBitmap = Bitmap.createBitmap(w,h,Bitmap.Config.ARGB_8888)
canvas = Canvas(mCanvasBitmap!!)
}
/**هده الدالى تستدعي عند بدأ الرسم علي canvas*/
override fun onDraw(canvas: Canvas) {
super.onDraw(canvas)
/**
* بقوم بالرسم باستخدام دالة ال canvas نمرر لها ( mCanvasPaint witch has the Attributes of the draw ,الاحداصيات Y;الاحداصيات X,الكنفس التي سنرسم عليها )
*/
canvas.drawBitmap(mCanvasBitmap!!,0f,0f,mCanvasPaint)
//set mDrawPaint stroke and color using the old path colors to draw it again
for (path in paths){
//initialize the stroke width using the object we created from customPath.class
mDrawPaint!!.strokeWidth = path.brishThickness
mDrawPath!!.color = path.color
//
canvas.drawPath(path,mDrawPaint!!)
}
//check if the drawPath was created using the inner class CustomPath
if(!mDrawPath!!.isEmpty){
//initialize the stroke width using the object we created from customPath.class
mDrawPaint!!.strokeWidth = mDrawPath!!.brishThickness
//initialize the draw color using the object we created from customPath.class
mDrawPaint!!.color = mDrawPath!!.color
///pass the drawpath and draw paint to the canvas to draw the path in the method draw path
canvas.drawPath(mDrawPath!!,mDrawPaint!!)
}
}
fun setBrushSize(newSize : Float){
mBrishSize= TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,newSize,resources.displayMetrics)
mDrawPaint!!.strokeWidth = mBrishSize
mDrawPaint!!.color = color
}
override fun onTouchEvent(event: MotionEvent?): Boolean {
val touchX = event?.x
val touchY = event?.y
when (event?.action) {
MotionEvent.ACTION_DOWN -> {
mDrawPath!!.color = color
mDrawPath!!.brishThickness = mBrishSize
mDrawPath!!.reset()
if (touchY != null) {
if (touchX != null) {
mDrawPath!!.moveTo(touchX, touchY)
}
}
}
MotionEvent.ACTION_MOVE -> {
if (touchY != null) {
if (touchX != null) {
mDrawPath!!.lineTo(touchX, touchY)
}
}
}
MotionEvent.ACTION_UP -> {
paths.add(mDrawPath!!)
mDrawPath = CustomPath(color, mBrishSize )
}
else -> return false
}
invalidate()
return true
}
fun setpathColor(newColor : Int ){
color = newColor
mDrawPaint!!.color= color
}
/** inner class to create customPath that we use to draw using it */
internal class CustomPath(var color:Int, var brishThickness : Float ): Path()
}
MainActivity.kt
package com.wissewassim.kid_drawing_app
import android.app.Dialog
import android.graphics.Color
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import android.view.View.OnClickListener
import android.widget.ImageButton
import com.wissewassim.kid_drawing_app.databinding.ActivityMainBinding
class MainActivity : AppCompatActivity(), OnClickListener {
private lateinit var binding: ActivityMainBinding
private var brushSize = 0.toFloat()
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
binding = ActivityMainBinding.inflate(layoutInflater)
val view = binding.root
setContentView(view)
//set the default brush size
binding.drawingView.setBrushSize(20.toFloat())
//change brush size when choose size in choosing brush size Dialog
binding.ibBrushSizeChange.setOnClickListener{ brushSizeDialog() }
binding.ibBrushColorRed.setOnClickListener(brushSizeDialog())
binding.ibBrushColorGreen.setOnClickListener(brushSizeDialog())
binding.ibBrushColorBlack.setOnClickListener(brushSizeDialog())
binding.ibBrushColorBlue.setOnClickListener(brushSizeDialog())
binding.ibBrushColorYellow.setOnClickListener(brushSizeDialog())
}
private fun brushSizeDialog(){
val brushDialog = Dialog(this)
brushDialog.setContentView(R.layout.dialog_brush_size)
brushDialog.setTitle("set brush size :")
val smallbrush = brushDialog.findViewById<ImageButton>(R.id.ib_small_brush_size)
val mudiumbrush = brushDialog.findViewById<ImageButton>(R.id.ib_meduim_brush_size)
val largebrush = brushDialog.findViewById<ImageButton>(R.id.ib_large_brush_size)
smallbrush.setOnClickListener{
brushSize = 20.toFloat()
binding.drawingView.setBrushSize(brushSize)
brushDialog.dismiss()
}
mudiumbrush.setOnClickListener{
brushSize = 30.toFloat()
binding.drawingView.setBrushSize(brushSize)
brushDialog.dismiss()
}
largebrush.setOnClickListener{
brushSize = 40.toFloat()
binding.drawingView.setBrushSize(brushSize)
brushDialog.dismiss()
}
brushDialog.show()
}
override fun onClick(v: View?) {
when(v?.id){
binding.ibBrushColorRed.id->{
binding.drawingView.setpathColor(Color.RED)
}
binding.ibBrushColorBlack.id->{
binding.drawingView.setpathColor(Color.BLACK)
}
binding.ibBrushColorYellow.id->{
binding.drawingView.setpathColor(Color.YELLOW)
}
binding.ibBrushColorGreen.id->{
binding.drawingView.setpathColor(Color.GREEN)
}
binding.ibBrushColorBlue.id->{
binding.drawingView.setpathColor(Color.BLUE)
}
}
}
}