android-自定义TextView在文字内容末尾添加图片icon、可以添加间距

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样式示意图

自定义属性 style.xml

    <declare-styleable name="IconLabelTextView"><attr name="iconSrc" format="reference"/><attr name="iconPaddingStart" format="dimension"/><attr name="iconPaddingTop" format="dimension"/><attr name="iconPaddingBottom" format="dimension"/></declare-styleable>

自定义View-IconLabelTextView代码片段

import android.content.Context
import android.graphics.Canvas
import android.graphics.drawable.Drawable
import android.text.Layout
import android.text.StaticLayout
import android.text.TextPaint
import android.util.AttributeSet
import androidx.appcompat.widget.AppCompatTextView
import com.foreo.common.utils.DensityUtils
import com.xyz.Rclass IconLabelTextView : AppCompatTextView {private var icon: Drawable? = nullprivate var iconPaddingStart: Int = 0private var iconPaddingTop: Int = 0private var iconPaddingBottom: Int = 0constructor(context: Context) : super(context) {init(null)}constructor(context: Context, attrs: AttributeSet?) : super(context, attrs) {init(attrs)}constructor(context: Context, attrs: AttributeSet?, defStyleAttr: Int) : super(context,attrs,defStyleAttr) {init(attrs)}private fun init(attrs: AttributeSet?) {val a = context.obtainStyledAttributes(attrs, R.styleable.IconLabelTextView)icon = a.getDrawable(R.styleable.IconLabelTextView_iconSrc)iconPaddingStart = a.getDimensionPixelSize(R.styleable.IconLabelTextView_iconPaddingStart, 0)iconPaddingTop = a.getDimensionPixelSize(R.styleable.IconLabelTextView_iconPaddingTop, 0)iconPaddingBottom = a.getDimensionPixelSize(R.styleable.IconLabelTextView_iconPaddingBottom, 0)a.recycle()}override fun onDraw(canvas: Canvas?) {super.onDraw(canvas)canvas?.let { canvas ->val textPaint: TextPaint = paintval lineHeight = textPaint.descent() - textPaint.ascent()val lineCount = layout.lineCountval paddingTop = paddingTop.toFloat()val availableWidth = width - paddingLeft - paddingRight - DensityUtils.dp2px(30)val layout = layout ?: return@letfor (i in 0 until lineCount) {val lineStart = layout.getLineStart(i)val lineEnd = layout.getLineEnd(i)val lineText = text.subSequence(lineStart, lineEnd).toString()if (i == lineCount - 1 && layout.getLineWidth(i) >= availableWidth) {// last line with maxLines and text filled completely, adjust text to fit iconvar adjustedText = lineTextvar textWidth = textPaint.measureText(lineText)val iconWidth = icon?.intrinsicWidth ?: 0while (textWidth + iconWidth + iconPaddingStart > availableWidth) {adjustedText = adjustedText.substring(0, adjustedText.length - 1)textWidth = textPaint.measureText(adjustedText)}if (!adjustedText.isNullOrBlank() && lineText != adjustedText) {val splitIndex = text.indexOf(adjustedText) + adjustedText.lengthtext?.substring(0, splitIndex)?.let { text = "$it..." }return}if (adjustedText.isNotEmpty()) {val staticLayout = StaticLayout(adjustedText,textPaint,availableWidth.toInt(),Layout.Alignment.ALIGN_NORMAL,1f,0f,false)val iconY =paddingTop + (lineHeight * i) + (lineHeight - (icon?.intrinsicHeight?: 0)) / 2 + iconPaddingTop - iconPaddingBottomval iconX = paddingLeft + staticLayout.width + iconPaddingStarticon?.setBounds(iconX.toInt(),iconY.toInt(),(iconX + iconWidth).toInt(),(iconY + (icon?.intrinsicHeight ?: 0)).toInt())icon?.draw(canvas)}} else if (i == lineCount - 1 && lineEnd <= text.length) {// last line, add iconicon?.let {val textWidth = textPaint.measureText(lineText)val iconY =paddingTop + (lineHeight * i) + (lineHeight - it.intrinsicHeight) / 2 + iconPaddingTop - iconPaddingBottomval iconX = paddingLeft + textWidth + iconPaddingStartit.setBounds(iconX.toInt(),iconY.toInt(),(iconX + it.intrinsicWidth).toInt(),(iconY + it.intrinsicHeight).toInt())it.draw(canvas)}}}}}fun setIcon(icon: Drawable?, paddingStart: Int, paddingTop: Int, paddingBottom: Int) {this.icon = iconthis.iconPaddingStart = paddingStartthis.iconPaddingTop = paddingTopthis.iconPaddingBottom = paddingBottominvalidate()}
}

xml中使用

  <com.xyz.IconLabelTextViewandroid:id="@+id/productVariation"android:layout_width="match_parent"android:layout_height="wrap_content"android:ellipsize="end"android:maxLines="2"android:textSize="12sp"app:iconPaddingBottom="0dp"app:iconPaddingStart="5dp"app:iconPaddingTop="3dp"app:iconSrc="@drawable/ic_arrow_down_cart"tools:text="Normal Skin" />

代码中使用

productVariation.setIcon(getDrawable(R.drawable.ic_arrow_down_cart),10,0,0)

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