how to scroll listview background with item

Question

I set a image as Listview background, if I want to scroll it with the item, what can I do?

for example: 1 is the background, if I scroll Listview down, it will chan

Answer 1

The code by AndroidLearner works well, except for one bug, see my comment on AndroidLearner's answer. I wrote a Kotlin version of his code that fixes the bug, and also works with any background that was defined in xml like so:

Here is the code:

import android.content.Context
import android.graphics.Canvas
import android.util.AttributeSet
import android.widget.ListView


class ListViewWithScrollingBackground(context: Context, attrs: AttributeSet)
: ListView(context, attrs) {

  private val background by lazy { getBackground().toBitmap() }

  override fun dispatchDraw(canvas: Canvas) {
    var y = if (childCount > 0) getChildAt(0).top.toFloat() - paddingTop else 0f
    while (y < height) {
      var x = 0f
      while (x < width) {
        canvas.drawBitmap(background, x, y, null)
        x += background.width
      }
      y += background.height
    }
    super.dispatchDraw(canvas)
  }

  private fun Drawable.toBitmap(): Bitmap = 
    if (this is BitmapDrawable && bitmap != null) bitmap else {
    val hasIntrinsicSize = intrinsicWidth <= 0 || intrinsicHeight <= 0
    val bitmap = Bitmap.createBitmap(if (hasIntrinsicSize) intrinsicWidth else 1,
      if (hasIntrinsicSize) intrinsicHeight else 1, Bitmap.Config.ARGB_8888)
    val canvas = Canvas(bitmap)
    setBounds(0, 0, canvas.width, canvas.height)
    draw(canvas)
    bitmap
  }

}

For the conversion of the Drawable to a Bitmap I used this post.