Android 具有背景色和行距的文本视图
我想展示下面这样的文本 我的编码如下:Android 具有背景色和行距的文本视图,android,background,textview,html,Android,Background,Textview,Html,我想展示下面这样的文本 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); 您可
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);
您可以在XML文件中使用
lineSpacingExtra
或lineSpacingMultiplier
。你可以在这里找到它:
对于背景色,您可以使用:
<TextView
android:background="#FFFF00"
/>
试试这个。
创建自定义TextView并覆盖方法draw(画布)
公共类BgColorTextView扩展了TextView{
公共BgColorTextView(上下文){
超级(上下文);
}
公共BgColorTextView(上下文、属性集属性){
超级(上下文,attrs);
}
公共BgColorTextView(上下文上下文、属性集属性、int defStyleAttr){
super(上下文、attrs、defStyleAttr);
}
公共BgColorTextView(上下文上下文、属性集属性、int-defStyleAttr、int-defStyleRes){
super(context、attrs、defStyleAttr、defStyleRes);
}
@凌驾
公共空白绘制(画布){
int lineCount=getLayout().getLineCount();
Rect Rect=新的Rect();
油漆=新油漆();
setColor(getResources().getColor(R.color.YOUR_CUSTOM_color));
对于(int i=0;i
这已经有很长时间了,但我将在下面介绍静态方法。希望它能帮助其他人
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);
我相信您会根据自己的需要进行修改。一个稍加修改的解决方案,基于,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)
}
}
对于存在相同问题的用户,可以创建一个扩展ReplacemntSpan类的新类,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Spanable中使用它。基于@evren ozturk答案,无需文本视图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))
}
}
面对同样的问题,我发现这个答案对我来说很好,应该也能解决你的问题。 在xml文本视图中配置此选项: android:lineSpacingMultiplier=“2” 链接: 已经11个月了,我希望你已经完成了!
祝你好运 我仍然有同样的问题,我也面临同样的问题。您找到解决方案了吗?文本背景似乎在某些字母的底部被剪切,例如“y”的底部。这是可行的,但是“getLayout()”可能返回null并崩溃。在这种情况下应该怎么做?当布局为空时,可以跳过绘图迭代。如果android没有布局,它会画什么?=)对最后,我就是这么做的:。但我认为这里有一个不同的问题,即使有一条空线也能勾勒出背景……他说的是文字包装
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))
}
}