Custom ImageView implementation

The purpose is as follows:

This is only for the ImageView above, the composite layout in the middle, and the banner diagram below, which was also mentioned before the uniform color processing of the status bar.Analyze the top and bottom hooked view, which can be achieved by simply extending ImageView.
Consider the following:

  1. Rounded top, normal bottom
  2. Model ID Text Drawing
  3. Discount drawing with a hook

Analyzing the need to redraw the model picture, then drawing the text to say nothing, the bottom tick curve I achieve is to draw the left and right rectangles, the middle two triangles filled with white.It is also very convenient to draw the path path path as a whole and fill it with a close.It's simple, and it hasn't changed much:

class ImageViewRadian : android.support.v7.widget.AppCompatImageView{
    private val radians = floatArrayOf(15.0f, 15.0f, 15.0f, 15.0f, 0.0f, 0.0f, 0.0f, 0.0f)

    constructor(context: Context) : super(context)

    constructor(context: Context, attrs: AttributeSet) : super(context, attrs)

    constructor(context: Context, attrs: AttributeSet, defStyleAttr: Int) : super(context, attrs, defStyleAttr)

    override fun onDraw(canvas: Canvas) {
        val path = Path()
        val width = this.width
        val height = this.height

        //Rounding effect
        path.addRoundRect(RectF(0f,0f,width.toFloat(),height.toFloat()),radians,Path.Direction.CW)
        canvas.clipPath(path)

        //Processing before and after the parent layout call, then processing the image above the previous view
        super.onDraw(canvas)

        val startX = this.x
        val startY = this.y
        val paint = Paint()
        paint.color = Color.WHITE
        paint.style = Paint.Style.FILL


        val paint2 = Paint()
        paint2.strokeWidth = 8f
        paint2.color = Color.RED
        paint2.style = Paint.Style.STROKE
        paint2.isAntiAlias = true
        paint2.strokeJoin = Paint.Join.ROUND

        val paint3 = Paint()
        paint3.color = resources.getColor(R.color.gray_light)
        paint3.strokeWidth = 5f

        //Bottom Center Coordinate Point
        val centerX = startX + width/2
        val centerY = startY + height

        //Inverted triangle path path
        val triangleLeft = Path()
        val triangleRight = Path()

        triangleLeft.moveTo(centerX-30,centerY-40)
        triangleLeft.lineTo(centerX-30,centerY)
        triangleLeft.lineTo(centerX,centerY)
        triangleLeft.close()

        triangleRight.moveTo(centerX+30,centerY-40)
        triangleRight.lineTo(centerX+30,centerY)
        triangleRight.lineTo(centerX,centerY)
        triangleRight.close()


        canvas.drawPath(triangleLeft,paint)
        canvas.drawPath(triangleRight,paint)

        //Draw left and right rectangles
        canvas.drawRect(startX,startY+height-40,centerX-30,centerY,paint)
        canvas.drawRect(centerX+30,centerY-40,width+startX,centerY,paint)

        //Draw a line with an inverted triangle
        val pathLine = Path()
        pathLine.moveTo(startX,startY+height-40)
        pathLine.lineTo(centerX-30,centerY-40)
        pathLine.lineTo(centerX,centerY-5)
        pathLine.lineTo(centerX+30,centerY-40)
        pathLine.lineTo(width+startX,centerY-40)
        canvas.drawPath(pathLine,paint2)

        //Draw Boundary
        canvas.drawLine(startX,startY+height-35,startX,startY+height,paint3)
        canvas.drawLine(startX+width,startY+height-35,startX+width,startY+height,paint3)
    }
}

Usage effect:

<com.meiyue.meimei.CustomMethods.GlideConverter.ImageViewRadius.ImageViewRadian
        android:id="@+id/img_index_item_head_model"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="6"
        android:src="@mipmap/ic_launcher" />

Design sketch:

We do not implement the layout we add until we call the parent onDraw, otherwise we may not see what we draw.

Tags: Android

Posted on Sat, 11 Jul 2020 10:41:00 -0400 by ronjon