我想显示如下文本...
我的编码如下：
SpannableString sText = new SpannableString(text);
sText.setSpan(new BackgroundColorSpan(Color.YELLOW), 0, sText.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
holder.txtText.setLineSpacing(0, 1.5f);
textView.setText(sText);
【问题讨论】：
标签： android background textview html
只是面临同样的问题，我发现这个答案对我来说很有效，应该也能解决你的问题。 在 xml 中的 TextView 上配置它：
android:lineSpacingMultiplier="2"
链接：How to add line spacing after every “\n” in a string in android?
已经 11 个月了，所以我希望你已经完成了它！ 祝你好运！
【讨论】：
基于@evren-ozturk 答案，没有 textView 链接和更好的排版支持
class RoundedBackgroundSpan(
private val textColor: Int,
private val backgroundColor: Int
) : ReplacementSpan() {
private val additionalPadding = 4.toPx().toFloat()
private val cornerRadius = 4.toPx().toFloat()
override fun draw(
canvas: Canvas,
text: CharSequence,
start: Int,
end: Int,
x: Float,
top: Int,
y: Int,
bottom: Int,
paint: Paint
) {
val newTop = y + paint.fontMetrics.ascent
val newBottom = y + paint.fontMetrics.descent
val rect = RectF(x, newTop, x + measureText(paint, text, start, end) + 2 * additionalPadding, newBottom)
paint.color = backgroundColor
canvas.drawRoundRect(rect, cornerRadius, cornerRadius, paint)
paint.color = textColor
canvas.drawText(text, start, end, x + additionalPadding, y.toFloat(), paint)
}
override fun getSize(paint: Paint, text: CharSequence?, start: Int, end: Int, fm: FontMetricsInt?): Int {
return (paint.measureText(text, start, end) + 2 * additionalPadding).roundToInt()
}
private fun measureText(paint: Paint, text: CharSequence, start: Int, end: Int): Float {
return paint.measureText(text, start, end)
}
private fun Int.toPx(): Int {
val resources = Resources.getSystem()
val metrics = resources.displayMetrics
return Math.round(this * (metrics.densityDpi / 160.0f))
}
}
【讨论】：
对于那些有同样问题的人，你可以创建一个新的类扩展 ReplacemntSpan 类并重写它的 draw 方法，如下所示：
public class RoundedBackgroundSpan extends ReplacementSpan {
private int backgroundColor = 0;
private int textColor = 0;
public RoundBackgroundSpan(Context context) {
super();
backgroundColor = ContextCompat.getColor(context , R.color.amber_600);
textColor = ContextCompat.getColor(context , R.color.white);
}
@Override
public void draw(Canvas canvas, CharSequence text, int start, int end, float x, int top, int y, int bottom, Paint paint) {
float newBottom = bottom - 2;
float newTop = top + 2;
RectF rect = new RectF(x , newTop , x + measureText(paint, text, start, end), newBottom );
paint.setColor(backgroundColor);
int CORNER_RADIUS = 8;
canvas.drawRoundRect(rect, CORNER_RADIUS, CORNER_RADIUS, paint);
paint.setColor(textColor);
canvas.drawText(text, start, end, x , y, paint);
}
@Override
public int getSize(Paint paint, CharSequence text, int start, int end, Paint.FontMetricsInt fm) {
return Math.round(paint.measureText(text, start, end));
}
private float measureText(Paint paint, CharSequence text, int start, int end) {
return paint.measureText(text, start, end);
}
}
并在您的 Spannable 中使用它..
【讨论】：
基于this 的一点修改解决方案，带有设置颜色的选项，在 kotlin 中：
//https://stackoverflow.com/a/30096905/878126
class BgColorTextView @JvmOverloads constructor(context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0) : AppCompatTextView(context, attrs, defStyleAttr) {
@Suppress("MemberVisibilityCanBePrivate")
var backgroundTextColor = -0x145bfb
set(value) {
field = value
invalidate()
}
override fun draw(canvas: Canvas) {
val currentLayout = layout
if (currentLayout == null) {
super.draw(canvas)
return
}
val lineCount = currentLayout.lineCount
val rect = Rect()
val paint = Paint()
paint.color = backgroundTextColor
for (i in 0 until lineCount) {
rect.top = currentLayout.getLineTop(i)
rect.left = currentLayout.getLineLeft(i).toInt()
rect.right = currentLayout.getLineRight(i).toInt()
rect.bottom = currentLayout.getLineBottom(i) - (if (i + 1 == lineCount) 0 else currentLayout.spacingAdd.toInt())
canvas.drawRect(rect, paint)
}
super.draw(canvas)
}
}
【讨论】：
已经很久了，但我将静态方法放在下面。希望它会帮助另一个人。
public static void setTextWithSpan(final TextView textView, int backgroundColor, String text, float lineSpacingMultiplier) {
class BackgroundColorSpanWithPaddingAndLineSpacing implements LineBackgroundSpan {
private float roundedCornerSize;
private int backgroundColor;
private int paddingSize;
private RectF rect;
private BackgroundColorSpanWithPaddingAndLineSpacing(int backgroundColor, int paddingSize, float roundedCornerSize) {
super();
this.backgroundColor = backgroundColor;
this.paddingSize = paddingSize;
this.roundedCornerSize = roundedCornerSize;
this.rect = new RectF();
}
@Override
public void drawBackground(Canvas c, Paint p, int left, int right, int top, int baseline, int bottom, CharSequence text, int start, int end, int currentLineNumber) {
final int textWidth = Math.round(p.measureText(text, start, end));
final int paintColor = p.getColor();
rect.set(left - paddingSize / 2, top - paddingSize / 4, left + textWidth + paddingSize / 2, top + textView.getTextSize() + paddingSize / 2);
p.setColor(backgroundColor);
c.drawRoundRect(rect, roundedCornerSize, roundedCornerSize, p);
p.setColor(paintColor);
}
}
int padding = textView.getPaddingLeft();
int radius = padding / 2;
SpannableStringBuilder builder = new SpannableStringBuilder(text);
BackgroundColorSpanWithPaddingAndLineSpacing backgroundSpan = new BackgroundColorSpanWithPaddingAndLineSpacing(backgroundColor, padding, radius);
builder.setSpan(backgroundSpan, 0, text.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
textView.setShadowLayer(padding, 0, 0, 0);
textView.setLineSpacing(0, lineSpacingMultiplier);
textView.setText(builder, TextView.BufferType.SPANNABLE);
}
用法：
SpanUtils.setTextWithSpan(titleTv, android.graphics.Color.BLUE, textStr, 1.4f);
我相信你会设法根据你的需要进行修改。
【讨论】：
试试这个。 创建自定义 TextView 并覆盖方法 draw(Canvas canvas)。
public class BgColorTextView extends TextView {
public BgColorTextView(Context context) {
super(context);
}
public BgColorTextView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public BgColorTextView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
public BgColorTextView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}
@Override
public void draw(Canvas canvas) {
int lineCount = getLayout().getLineCount();
Rect rect = new Rect();
Paint paint = new Paint();
paint.setColor(getResources().getColor(R.color.YOUR_CUSTOM_COLOR));
for (int i = 0; i < lineCount; i++) {
rect.top = (getLayout().getLineTop(i));
rect.left = (int) getLayout().getLineLeft(i);
rect.right = (int) getLayout().getLineRight(i);
rect.bottom = (int) (getLayout().getLineBottom(i) - ((i + 1 == lineCount) ? 0 : getLayout().getSpacingAdd()));
canvas.drawRect(rect, paint);
}
super.draw(canvas);
}
}
【讨论】：
您可以在 XML 文件中使用 lineSpacingExtra 或 lineSpacingMultiplier。你可以在这里找到它：http://developer.android.com/reference/android/widget/TextView.html#attr_android%3alineSpacingExtra
对于背景颜色，您可以使用：
<TextView
android:background="#FFFF00"
/>
【讨论】：