Android 自定义View 一行显示不下换行显示
2024-04-25 02:24:46
今天撸一个 文字显示不下换行显示的view
首先聊天页面显示文本 有一个最低高度 和最大宽度，这里直接就写死，或者写屏幕尺寸比例均可。
先定义需要的变量如：最大宽度、 view的宽高、画笔、间距、x轴边距等等
// 显示聊天内容的画笔private lateinit var mTextPaint: TextPaint// 显示时间 和 绘制图标的画笔private lateinit var mPaint: Paint// 显示文本内容private lateinit var staticLayout: StaticLayout// 最大总宽度private val mMaxWidth = 248.dp2Px()// view的宽高private var mWidth = 0private var mHeight = 0// 绘制时间两侧图标的间隔private val space = 5.dp2Px()// 距离左边X轴的边距private var leftX = 0// 距离上边Y轴的边距private var topY = 0// 绘制的文本private var textContent: CharSequence = ""private var textContentClick: CharSequence = ""// 最后一行文本的宽度private var lineWidth: Float = 0f在设置显示内容时，处理一下表情显示异常问题，还有特殊文本显示问题例如 @某某某，链接等，在绘制的时候还要处理字符加粗还是正常显示，画笔需要自己实现
fun setTimePaint(paint: Paint): ChatTextViewLayout {this.mPaint = paintreturn this
}fun setTextPaint(textPaint: TextPaint): ChatTextViewLayout {this.mTextPaint = textPaintreturn this
}fun setTextContent(text: CharSequence): ChatTextViewLayout {val spannableStringBuilder = SpannableStringBuilder(text.trim())val fontMetrics: Paint.FontMetrics = mTextPaint.fontMetricsval defaultEmojiSize = fontMetrics.descent - fontMetrics.ascentEmojiManager.getInstance().replaceWithImages(context, spannableStringBuilder, defaultEmojiSize)this.textContentClick = spannableStringBuilderthis.textContent = AtUserHelper.parseAtUserLinkJx(spannableStringBuilder,ContextCompat.getColor(context, R.color.color_at), object : AtUserLinkOnClickListener {override fun ulrLinkClick(str: String?) {}override fun atUserClick(str: String?) {}override fun phoneClick(str: String?) {}}).trim()return this
}然后是测量文本内容的宽高，在这里用的是StaticLayout，如果一行可以显示下，就正常显示 在右侧绘制出显示的时间和状态图标，如果显示不下，那么添加一行高度，在最右侧绘制；如果是多行，就计算出最后一行的文本宽度，逻辑如此。
private fun createLayout() {val maxWidth = mMaxWidthval textWidthRect = mTextPaint.measureText(textContent.toString())val staticLayoutWidth = (if (textWidthRect > maxWidth) maxWidth else textWidthRect).toInt()staticLayout =StaticLayout.Builder.obtain(textContent, 0, textContent.length, mTextPaint, staticLayoutWidth).setText(textContent).setAlignment(Layout.Alignment.ALIGN_NORMAL).setLineSpacing(0.0f, 1.0f).setIncludePad(false).build()try {for (i in 0 until staticLayout.lineCount) {try {lineWidth = staticLayout.getLineWidth(i)if (lineWidth >= staticLayoutWidth) {lineWidth = staticLayoutWidth.toFloat()}
// textHeight = max(
// textHeight.toDouble(),
// ceil(staticLayout.getLineBottom(i).toDouble())
// ).toInt()} catch (e: Exception) {e.printStackTrace()break}
// textWidth = max(textWidth.toDouble(), ceil(lineWidth.toDouble())).toInt()}} catch (e: Exception) {e.printStackTrace()}leftX = 0topY = 0// 先计算发送状态的宽度val sendStateWidth =if (!isTopReadState && sendState == 1) readStateBitmap.width + space else 0// 右侧时间发送状态布局的宽度 = 发送状态的宽度 + 时间宽度 + 间距 + 置顶宽度val timeLayoutWidth =sendStateWidth + timeWidth + space * 2 + if (isTopMsg) topBitmap.width + space else 0/*** 总宽度 如果超出一行 那么取最大宽度* 如果是一行 那么计算 总宽度 = 文本 + 右侧时间发送状态布局的宽度*/mWidth = if (staticLayout.lineCount > 1 || lineWidth > mMaxWidth - timeLayoutWidth) {staticLayoutWidth} else {(lineWidth + timeLayoutWidth).toInt()}// 高度取决于最后一行文本的宽度 如果时间和图标显示不下 那么就添加一行高度/*** 显示不下：* 高度 = 文本高度 + + 上下边距 + (单行文本高度和间距)* 一行显示：* 高度 = 文本高度 + 上下边距*/// 先判断最后一行文本宽度是否能显示下，总宽度 - 左右间距 - 右侧时间和左右图标的宽度间距mHeight = if (lineWidth > mMaxWidth - timeLayoutWidth) {staticLayout.height / staticLayout.lineCount + staticLayout.height - space} else {staticLayout.height}}剩下的就简单了，计算绘制就可以了
override fun onDraw(canvas: Canvas) {super.onDraw(canvas)createLayout()// 先绘制文本canvas.save()canvas.translate(leftX.toFloat(), topY.toFloat())staticLayout.draw(canvas)if (!isTopReadState && sendState == 1) {// 绘制右侧发送状态的图标leftX = mWidth - readStateBitmap.width// 右侧发送状态图标较大 稍微偏下一点点topY = mHeight - readStateBitmap.height + space / 2canvas.drawBitmap(readStateBitmap, leftX.toFloat(), topY.toFloat(), mPaint)}// 绘制时间leftX = if (leftX == 0) {mWidth - timeWidth.toInt() - space} else {leftX - timeWidth.toInt() - space}topY = mHeightcanvas.drawText(time, 0, time.length, leftX.toFloat(), topY.toFloat(), mPaint)// 如果置顶绘制置顶if (isTopMsg) {leftX = leftX - topBitmap.width - spacetopY = mHeight - topBitmap.heightcanvas.drawBitmap(topBitmap, leftX.toFloat(), topY.toFloat(), mPaint)}}最后处理点击事件，因为StaticLayout绘制，SpannableStringBuilder样式可以显示，但点击事件并不行(这里我试过好多次，也换好几种方式，都不支持点击事件，不知道是不是我的姿势不对，如果有人实现了那么请@我，留下代码，让我学习学习)，因为显示的时候是SpannableStringBuilder，但是点击的时候计算的位置，所以点击处理用的是原始没有处理过的文本数据，然后拆分判断点击的是某个@或链接，(当时都要吐血了) 先正则判断是什么，在进行替换，然后计算字符，响应点击事件。
```
override fun onTouchEvent(event: MotionEvent): Boolean {when (event.action) {MotionEvent.ACTION_UP -> {if (event.x >= 0f && event.x <= staticLayout.width && event.y >= 0f && event.y <= staticLayout.height) {val line: Int = staticLayout.getLineForVertical(event.y.toInt())val off: Int = staticLayout.getOffsetForHorizontal(line, event.x)// 进行正则匹配[文字](链接)val spannableString = SpannableStringBuilder(textContentClick)clickTextContentUrl(clickTextContentAt(textContentClick, off, spannableString),off,spannableString)}}}return super.onTouchEvent(event)}/*** 处理点击的是At*/private fun clickTextContentAt(text: CharSequence,off: Int,spannableString: SpannableStringBuilder): SpannableStringBuilder {try {val matcherAt = Pattern.compile(AT_PATTERN).matcher(text)var replaceOffsetAt = 0 //每次替换之后matcher的偏移量while (matcherAt.find()) {// 解析链接 格式是[文字](链接)val name = matcherAt.group(0)val uid = name?.substring(2, name.length - 1)// 把匹配成功的串append进结果串中, 并设置点击效果val groupMemberBean = uid?.let { getGroupDb().getAllMemberById(it) }if (groupMemberBean != null) {val atName = "@" + groupMemberBean.name + " "val clickSpanStartAt = matcherAt.start() - replaceOffsetAtval clickSpanEndAt = clickSpanStartAt + atName.lengthspannableString.replace(matcherAt.start() - replaceOffsetAt,matcherAt.end() - replaceOffsetAt,atName)replaceOffsetAt += matcherAt.end() - matcherAt.start() - atName.lengthval clickableSpan = object : ClickableSpan() {override fun onClick(view: View) {// 点击事件并不灵}}spannableString.setSpan(clickableSpan,clickSpanStartAt,clickSpanEndAt,Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)// 点击回调if (clickSpanStartAt <= off && off <= clickSpanEndAt) {postDelayed({ onClickListener.invoke(uid, TEXT_TYPE_AT) }, 100)break}}}} catch (e: java.lang.Exception) {e.printStackTrace()}return spannableString}/*** 处理点击的是链接*/private fun clickTextContentUrl(text: CharSequence,off: Int,spannableString: SpannableStringBuilder) {try {//超链接转化val matcher = Pattern.compile(AtUserHelper.URL_PATTERN).matcher(text)var replaceOffset = 0 //每次替换之后matcher的偏移量while (matcher.find()) {// 解析链接 格式是[文字](链接)val name = matcher.group(0)val clickSpanStart = matcher.start() - replaceOffsetval clickSpanEnd = clickSpanStart + (name?.length ?: 0)spannableString.replace(matcher.start() - replaceOffset,matcher.end() - replaceOffset,name)replaceOffset += matcher.end() - matcher.start() - (name?.length ?: 0)val clickableSpan = object : ClickableSpan() {override fun onClick(view: View) {}}spannableString.setSpan(clickableSpan,clickSpanStart,clickSpanEnd,Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)if (clickSpanStart <= off && off <= clickSpanEnd) {postDelayed({ onClickListener.invoke(name, TEXT_TYPE_LINK) }, 100)break}}} catch (e: java.lang.Exception) {e.printStackTrace()}}下面是完整代码
import android.annotation.SuppressLint
import android.content.Context
import android.graphics.*
import android.text.*
import android.text.style.ClickableSpan
import android.util.AttributeSet
import android.view.MotionEvent
import android.view.View
import android.view.ViewGroup
import androidx.core.content.ContextCompat
import com.blankj.utilcode.util.StringUtils
import com.vanniktech.emoji.EmojiManager
import com.ym.base.ext.dp2Px
import com.ym.chat.R
import com.ym.chat.db.ChatDao.getGroupDb
import com.ym.chat.ext.ORIENTATION_LEFT
import com.ym.chat.utils.StringExt.AT_PATTERN
import com.ym.chat.widget.ateditview.AtUserHelper
import com.ym.chat.widget.ateditview.AtUserLinkOnClickListener
import java.util.regex.Pattern/*** description:** @author Db_z* @Date 2023/1/16 13:12*/
class ChatTextViewLayout @JvmOverloads constructor(context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0
) : ViewGroup(context, attrs, defStyleAttr) {// 显示聊天内容的画笔private lateinit var mTextPaint: TextPaint// 显示时间 和 绘制图标的画笔private lateinit var mPaint: Paint// 显示文本内容private lateinit var staticLayout: StaticLayout// 点击的文本类型companion object {const val TEXT_TYPE_LINK = 1const val TEXT_TYPE_AT = 2
// const val TEXT_TYPE_PHONE = 3}private lateinit var onClickListener: (str: String?, textType: Int) -> Unit
// private var textWidth = 0
// private var textHeight = 0// view的宽高private var mWidth = 0private var mHeight = 0// 最大总宽度private val mMaxWidth = 248.dp2Px()// 绘制时间两侧图标的间隔private val space = 5.dp2Px()// 距离左边X轴的边距private var leftX = 0// 距离上边Y轴的边距private var topY = 0// 发送状态的图标private lateinit var readStateBitmap: Bitmap// 发送的状态private var sendState = 0// 显示已读的状态private var readState = 0// 置顶的图标private lateinit var topBitmap: Bitmap// 是否置顶private var isTopMsg: Boolean = false// 如果是true 隐藏private var isTopReadState = false// 绘制的文本private var textContent: CharSequence = ""private var textContentClick: CharSequence = ""// 最后一行文本的宽度private var lineWidth: Float = 0f// 绘制的时间private var time: String = "00:00"// 时间的文本宽度private var timeWidth: Float = 0ffun setSendState(sendState: Int): ChatTextViewLayout {this.sendState = sendStatereturn this}fun setReadState(readState: Int, isTop: Boolean): ChatTextViewLayout {this.readState = readStateisTopReadState = isTopreadStateBitmap = if (readState == 1) {BitmapFactory.decodeResource(context.resources, R.drawable.iv_text_read)} else {BitmapFactory.decodeResource(context.resources, R.drawable.iv_text_unread)}return this}fun setTimePaint(paint: Paint): ChatTextViewLayout {this.mPaint = paintreturn this}fun setTextPaint(textPaint: TextPaint): ChatTextViewLayout {this.mTextPaint = textPaintreturn this}fun setTextContent(text: CharSequence): ChatTextViewLayout {val spannableStringBuilder = SpannableStringBuilder(text.trim())val fontMetrics: Paint.FontMetrics = mTextPaint.fontMetricsval defaultEmojiSize = fontMetrics.descent - fontMetrics.ascentEmojiManager.getInstance().replaceWithImages(context, spannableStringBuilder, defaultEmojiSize)this.textContentClick = spannableStringBuilderthis.textContent = AtUserHelper.parseAtUserLinkJx(spannableStringBuilder,ContextCompat.getColor(context, R.color.color_at), object : AtUserLinkOnClickListener {override fun ulrLinkClick(str: String?) {}override fun atUserClick(str: String?) {}override fun phoneClick(str: String?) {}}).trim()return this}fun setTime(time: String): ChatTextViewLayout {this.time = timereturn this}fun showTopMsg(isTopMsg: Boolean, orientation: Int = ORIENTATION_LEFT): ChatTextViewLayout {this.isTopMsg = isTopMsgtopBitmap = if (orientation == ORIENTATION_LEFT){BitmapFactory.decodeResource(context.resources, R.drawable.icon_top_grey)} else {BitmapFactory.decodeResource(context.resources, R.drawable.icon_top_blue)}return this}fun setOnClickListener(onClickListener: (str: String?, textType: Int) -> Unit): ChatTextViewLayout {this.onClickListener = onClickListenerreturn this}fun build() {if (StringUtils.isEmpty(time) || StringUtils.isEmpty(textContent)) returntimeWidth = mPaint.measureText(time)createLayout()setWillNotDraw(false)requestLayout()}/*** 处理点击的是At*/private fun clickTextContentAt(text: CharSequence,off: Int,spannableString: SpannableStringBuilder): SpannableStringBuilder {try {val matcherAt = Pattern.compile(AT_PATTERN).matcher(text)var replaceOffsetAt = 0 //每次替换之后matcher的偏移量while (matcherAt.find()) {// 解析链接 格式是[文字](链接)val name = matcherAt.group(0)val uid = name?.substring(2, name.length - 1)// 把匹配成功的串append进结果串中, 并设置点击效果val groupMemberBean = uid?.let { getGroupDb().getAllMemberById(it) }if (groupMemberBean != null) {val atName = "@" + groupMemberBean.name + " "val clickSpanStartAt = matcherAt.start() - replaceOffsetAtval clickSpanEndAt = clickSpanStartAt + atName.lengthspannableString.replace(matcherAt.start() - replaceOffsetAt,matcherAt.end() - replaceOffsetAt,atName)replaceOffsetAt += matcherAt.end() - matcherAt.start() - atName.lengthval clickableSpan = object : ClickableSpan() {override fun onClick(view: View) {}}spannableString.setSpan(clickableSpan,clickSpanStartAt,clickSpanEndAt,Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)if (clickSpanStartAt <= off && off <= clickSpanEndAt) {postDelayed({ onClickListener.invoke(uid, TEXT_TYPE_AT) }, 100)break}}}} catch (e: java.lang.Exception) {e.printStackTrace()}return spannableString}/*** 处理点击的是链接*/private fun clickTextContentUrl(text: CharSequence,off: Int,spannableString: SpannableStringBuilder) {try {//超链接转化val matcher = Pattern.compile(AtUserHelper.URL_PATTERN).matcher(text)var replaceOffset = 0 //每次替换之后matcher的偏移量while (matcher.find()) {// 解析链接 格式是[文字](链接)val name = matcher.group(0)val clickSpanStart = matcher.start() - replaceOffsetval clickSpanEnd = clickSpanStart + (name?.length ?: 0)spannableString.replace(matcher.start() - replaceOffset,matcher.end() - replaceOffset,name)replaceOffset += matcher.end() - matcher.start() - (name?.length ?: 0)val clickableSpan = object : ClickableSpan() {override fun onClick(view: View) {}}spannableString.setSpan(clickableSpan,clickSpanStart,clickSpanEnd,Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)if (clickSpanStart <= off && off <= clickSpanEnd) {postDelayed({ onClickListener.invoke(name, TEXT_TYPE_LINK) }, 100)break}}} catch (e: java.lang.Exception) {e.printStackTrace()}}@SuppressLint("ClickableViewAccessibility")override fun onTouchEvent(event: MotionEvent): Boolean {when (event.action) {MotionEvent.ACTION_UP -> {if (event.x >= 0f && event.x <= staticLayout.width && event.y >= 0f && event.y <= staticLayout.height) {val line: Int = staticLayout.getLineForVertical(event.y.toInt())val off: Int = staticLayout.getOffsetForHorizontal(line, event.x)// 进行正则匹配[文字](链接)val spannableString = SpannableStringBuilder(textContentClick)clickTextContentUrl(clickTextContentAt(textContentClick, off, spannableString),off,spannableString)}}}return super.onTouchEvent(event)}private fun createLayout() {val maxWidth = mMaxWidthval textWidthRect = mTextPaint.measureText(textContent.toString())val staticLayoutWidth = (if (textWidthRect > maxWidth) maxWidth else textWidthRect).toInt()staticLayout =StaticLayout.Builder.obtain(textContent, 0, textContent.length, mTextPaint, staticLayoutWidth).setText(textContent).setAlignment(Layout.Alignment.ALIGN_NORMAL).setLineSpacing(0.0f, 1.0f).setIncludePad(false).build()try {for (i in 0 until staticLayout.lineCount) {try {lineWidth = staticLayout.getLineWidth(i)if (lineWidth >= staticLayoutWidth) {lineWidth = staticLayoutWidth.toFloat()}
// textHeight = max(
// textHeight.toDouble(),
// ceil(staticLayout.getLineBottom(i).toDouble())
// ).toInt()} catch (e: Exception) {e.printStackTrace()break}
// textWidth = max(textWidth.toDouble(), ceil(lineWidth.toDouble())).toInt()}} catch (e: Exception) {e.printStackTrace()}leftX = 0topY = 0// 先计算发送状态的宽度val sendStateWidth =if (!isTopReadState && sendState == 1) readStateBitmap.width + space else 0// 右侧时间发送状态布局的宽度 = 发送状态的宽度 + 时间宽度 + 间距 + 置顶宽度val timeLayoutWidth =sendStateWidth + timeWidth + space * 2 + if (isTopMsg) topBitmap.width + space else 0/*** 总宽度 如果超出一行 那么取最大宽度* 如果是一行 那么计算 总宽度 = 文本 + 右侧时间发送状态布局的宽度*/mWidth = if (staticLayout.lineCount > 1 || lineWidth > mMaxWidth - timeLayoutWidth) {staticLayoutWidth} else {(lineWidth + timeLayoutWidth).toInt()}// 高度取决于最后一行文本的宽度 如果时间和图标显示不下 那么就添加一行高度/*** 显示不下：* 高度 = 文本高度 + + 上下边距 + (单行文本高度和间距)* 一行显示：* 高度 = 文本高度 + 上下边距*/// 先判断最后一行文本宽度是否能显示下，总宽度 - 左右间距 - 右侧时间和左右图标的宽度间距mHeight = if (lineWidth > mMaxWidth - timeLayoutWidth) {staticLayout.height / staticLayout.lineCount + staticLayout.height - space} else {staticLayout.height}}override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {super.onMeasure(widthMeasureSpec, heightMeasureSpec)setMeasuredDimension(mWidth, mHeight)}override fun onDraw(canvas: Canvas) {super.onDraw(canvas)createLayout()// 先绘制文本canvas.save()canvas.translate(leftX.toFloat(), topY.toFloat())staticLayout.draw(canvas)if (!isTopReadState && sendState == 1) {// 绘制右侧发送状态的图标leftX = mWidth - readStateBitmap.width// 右侧发送状态图标较大 稍微偏下一点点topY = mHeight - readStateBitmap.height + space / 2canvas.drawBitmap(readStateBitmap, leftX.toFloat(), topY.toFloat(), mPaint)}// 绘制时间leftX = if (leftX == 0) {mWidth - timeWidth.toInt() - space} else {leftX - timeWidth.toInt() - space}topY = mHeightcanvas.drawText(time, 0, time.length, leftX.toFloat(), topY.toFloat(), mPaint)// 如果置顶绘制置顶if (isTopMsg) {leftX = leftX - topBitmap.width - spacetopY = mHeight - topBitmap.heightcanvas.drawBitmap(topBitmap, leftX.toFloat(), topY.toFloat(), mPaint)}}override fun onLayout(changed: Boolean, l: Int, t: Int, r: Int, b: Int) {}
}
```
```
// 调用
holder.viewBinding.content.setTextPaint(getChatTextPaint(data)).setTimePaint(getChatTimeTextPaint(ORIENTATION_RIGHT)).showTopMsg(data.isTopMsg, ORIENTATION_RIGHT).setSendState(data.sendState).setReadState(data.msgReadState, data.isTop).setTextContent(data.content).setTime(getTimeStr(data.createTime)).setOnClickListener { str, textType ->when (textType) {TEXT_TYPE_LINK -> {if (isLongDown) return@setOnClickListenerulrLinkClick(context, str, data, holder.layoutPosition, onGroupLinkClickListener)}TEXT_TYPE_AT -> {if (isLongDown) return@setOnClickListeneratUserClick(context, str, data)}}}.build()const val ORIENTATION_LEFT = 1
const val ORIENTATION_RIGHT = 2/*** 获取聊天页面显示时间的画笔* @param orientation 方向 左侧和右侧*/
fun getChatTimeTextPaint(orientation: Int = ORIENTATION_LEFT): Paint {return TextPaint(Paint.ANTI_ALIAS_FLAG).apply {isAntiAlias = truetextSize = 12.dp2Px().toFloat()color =if (orientation == ORIENTATION_LEFT) Color.parseColor("#969799") else Color.parseColor("#0081FF")}
}/*** 获取特殊发言限制的画笔*/
fun getChatTextPaint(data: ChatMessageBean): TextPaint {// 先查询发消息的人在群里是不是群管理或者群主 如果是在查询群设置return TextPaint(Paint.ANTI_ALIAS_FLAG).apply {isAntiAlias = truetextSize = 16.dp2Px().toFloat()// 文本是否加粗isFakeBoldText = falsecolor = Color.parseColor("#323233")}
}基本上就是全部代码了，其中有自己不需要的进行剔除。
好久没更新，等有时间会进行整理，然后在给出git。
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