When I include the below XML to layout file, I can see the below image. If you see it, you could realize that the TextView has top and bottom space.
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="E1"
android:background="#ff00ff00"/>
I wish to remove the space. How to remove it? What is it called? If anyone has clue.. please let me know. Thanks in advance.
Modified this answer a little bit to use kotlin class and extend AppCompatTextView, trimming vertical padding.
It allows setting android:fontFamily. Method calculateTextParams() moved from onDraw() for performance. Not tested for multiple lines of text:
import android.content.Context
import android.graphics.Canvas
import android.graphics.Rect
import android.util.AttributeSet
import androidx.appcompat.widget.AppCompatTextView
class NoPaddingTextView : AppCompatTextView
{
private val boundsRect = Rect()
private val textParams = calculateTextParams()
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)
{
with(boundsRect) {
paint.isAntiAlias = true
paint.color = currentTextColor
canvas.drawText(textParams,
-left.toFloat(),
(-top - bottom).toFloat(),
paint)
}
}
override fun onMeasure(widthMeasureSpec : Int, heightMeasureSpec : Int)
{
super.onMeasure(widthMeasureSpec, heightMeasureSpec)
calculateTextParams()
setMeasuredDimension(boundsRect.width() + 1, -boundsRect.top + 1)
}
private fun calculateTextParams() : String
{
return text.toString()
.also {text ->
text.length.let {textLength ->
paint.textSize = textSize
paint.getTextBounds(text, 0, textLength, boundsRect)
if(textLength == 0) boundsRect.right = boundsRect.left
}
}
}
}
The answer of TopAlignedTextView code:TopAlignedTextView@GitHub
use it by layout:
<com.github.captain_miao.view.TopAlignedTextView
android:id="@+id/text_a"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:text="@string/text_demo_a"
/>
