TypedValue.applyDimension

android中 TypedValue.applyDimension()的作用
这个方法是转换但我的一个函数,例如
int size =(int)TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 20,context.getResources().getDisplayMetrics());

这里COMPLEX_UNIT_SP是单位,20是数值,也就是20sp。

 


 /**
  * dp转px
  *
  * @param context
  * @param val
  * @return
  */
 public static int dp2px(Context context, float dpVal)
 {
  return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
    dpVal, context.getResources().getDisplayMetrics());
 }

 /**
  * sp转px
  *
  * @param context
  * @param val
  * @return
  */
 public static int sp2px(Context context, float spVal)
 {
  return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP,
    spVal, context.getResources().getDisplayMetrics());
 }

 /**
  * px转dp
  *
  * @param context
  * @param pxVal
  * @return
  */
 public static float px2dp(Context context, float pxVal)
 {
  final float scale = context.getResources().getDisplayMetrics().density;
  return (pxVal / scale);
 }

 /**
  * px转sp
  *
  * @param fontScale
  * @param pxVal
  * @return
  */
 public static float px2sp(Context context, float pxVal)
 {
  return (pxVal / context.getResources().getDisplayMetrics().scaledDensity);
 }

 

class AutoResizeTextView @JvmOverloads constructor( context: Context, attrs: AttributeSet? = null, defStyle: Int = android.R.attr.textViewStyle ) : AppCompatTextView(context, attrs, defStyle) { private val availableSpaceRect = RectF() private val sizeTester: SizeTester private var maxTextSize: Float = 0.toFloat() private var spacingMult = 1.0f private var spacingAdd = 0.0f private var minTextSize: Float = 0.toFloat() private var widthLimit: Int = 0 private var maxLines: Int = NO_LINE_LIMIT private var initialized = false private var textPaint: TextPaint private interface SizeTester { /** * @param suggestedSize Size of text to be tested * @param availableSpace available space in which text must fit * @return an integer < 0 if after applying `suggestedSize` to * text, it takes less space than `availableSpace`, > 0 * otherwise */ fun onTestSize(suggestedSize: Int, availableSpace: RectF): Int } init { // using the minimal recommended font size minTextSize = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 12f, resources.displayMetrics) maxTextSize = textSize textPaint = TextPaint(paint) // prepare size tester: sizeTester = object : SizeTester { val textRect = RectF() override fun onTestSize(suggestedSize: Int, availableSpace: RectF): Int { textPaint.textSize = suggestedSize.toFloat() val transformationMethod = transformationMethod val text: String = transformationMethod?.getTransformation(text, this@AutoResizeTextView) ?.toString() ?: text.toString() val singleLine = maxLines == 1 if (singleLine) { textRect.bottom = textPaint.fontSpacing textRect.right = textPaint.measureText(text) } else { val layout: StaticLayout = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) { StaticLayout.Builder.obtain(text, 0, text.length, textPaint, widthLimit) .setLineSpacing(spacingAdd, spacingMult) .setAlignment(Alignment.ALIGN_NORMAL).setIncludePad(true).build() } else { @Suppress("DEPRECATION") StaticLayout( text, textPaint, widthLimit, Alignment.ALIGN_NORMAL, spacingMult, spacingAdd, true ) } // return early if we have more lines if (maxLines != NO_LINE_LIMIT && layout.lineCount > maxLines) return 1 textRect.bottom = layout.height.toFloat() var maxWidth = -1 val lineCount = layout.lineCount for (i in 0 until lineCount) { val end = layout.getLineEnd(i) if (i < lineCount - 1 && end > 0 && !isValidWordWrap(text[end - 1])) return 1 if (maxWidth < layout.getLineRight(i) - layout.getLineLeft(i)) maxWidth = layout.getLineRight(i).toInt() - layout.getLineLeft(i).toInt() } //for (int i = 0; i < layout.getLineCount(); i++) // if (maxWidth < layout.getLineRight(i) - layout.getLineLeft(i)) // maxWidth = (int) layout.getLineRight(i) - (int) layout.getLineLeft(i); textRect.right = maxWidth.toFloat() } textRect.offsetTo(0f, 0f) return if (availableSpace.contains(textRect)) -1 else 1 // else, too big } } initialized = true } fun isValidWordWrap(c: Char): Boolean { return c == ' ' || c == '-' } override fun setAllCaps(allCaps: Boolean) { super.setAllCaps(allCaps) adjustTextSize() } override fun setTypeface(tf: Typeface?) { super.setTypeface(tf) adjustTextSize() } override fun setTextSize(size: Float) { maxTextSize = size adjustTextSize() } override fun setMaxLines(maxLines: Int) { super.setMaxLines(maxLines) this.maxLines = maxLines adjustTextSize() } override fun getMaxLines(): Int { return maxLines } override fun setSingleLine() { super.setSingleLine() maxLines = 1 adjustTextSize() } override fun setSingleLine(singleLine: Boolean) { super.setSingleLine(singleLine) maxLines = if (singleLine) 1 else NO_LINE_LIMIT adjustTextSize() } override fun setLines(lines: Int) { super.setLines(lines) maxLines = lines adjustTextSize() } override fun setTextSize(unit: Int, size: Float) { val c = context val r: Resources = if (c == null) Resources.getSystem() else c.resources maxTextSize = TypedValue.applyDimension(unit, size, r.displayMetrics) adjustTextSize() } override fun setLineSpacing(add: Float, mult: Float) { super.setLineSpacing(add, mult) spacingMult = mult spacingAdd = add } /** * Set the lower text size limit and invalidate the view, sp value. */ @Suppress("unused") fun setMinTextSize(minTextSize: Float) { this.minTextSize = sp2px(minTextSize).toFloat() adjustTextSize() } private fun adjustTextSize() { // This is a workaround for truncated text issue on ListView, as shown here: https://github.com/AndroidDeveloperLB/AutoFitTextView/pull/14 // TODO think of a nicer, elegant solution. // post(new Runnable() // { // @Override // public void run() // { if (!initialized) return val startSize = minTextSize.toInt() val heightLimit = measuredHeight - compoundPaddingBottom - compoundPaddingTop widthLimit = measuredWidth - compoundPaddingLeft - compoundPaddingRight if (widthLimit <= 0) return textPaint = TextPaint(paint) availableSpaceRect.right = widthLimit.toFloat() availableSpaceRect.bottom = heightLimit.toFloat() superSetTextSize(startSize) // } // }); } private fun superSetTextSize(startSize: Int) { val textSize = binarySearch(startSize, maxTextSize.toInt(), sizeTester, availableSpaceRect) super.setTextSize(TypedValue.COMPLEX_UNIT_PX, textSize.toFloat()) } private fun binarySearch( start: Int, end: Int, sizeTester: SizeTester, availableSpace: RectF ): Int { var lastBest = start var lo = start var hi = end - 1 var mid: Int while (lo <= hi) { mid = (lo + hi).ushr(1) val midValCmp = sizeTester.onTestSize(mid, availableSpace) if (midValCmp < 0) { lastBest = lo lo = mid + 1 } else if (midValCmp > 0) { hi = mid - 1 lastBest = hi } else return mid } // make sure to return last best // this is what should always be returned return lastBest } override fun onTextChanged(text: CharSequence, start: Int, before: Int, after: Int) { super.onTextChanged(text, start, before, after) adjustTextSize() } override fun onSizeChanged(width: Int, height: Int, oldwidth: Int, oldheight: Int) { super.onSizeChanged(width, height, oldwidth, oldheight) if (width != oldwidth || height != oldheight) adjustTextSize() } companion object { private const val NO_LINE_LIMIT = -1 } } 功能描述,并且增加完整注释
最新发布
07-06
private void addTableRow(TableLayout table, Object[] rowData) { TableRow row = new TableRow(requireContext()); // 设置行布局参数(正确方式) TableLayout.LayoutParams rowParams = new TableLayout.LayoutParams( TableLayout.LayoutParams.MATCH_PARENT, TableLayout.LayoutParams.WRAP_CONTENT ); row.setLayoutParams(rowParams); // 设置最小行高(单位:dp) int minRowHeight = dpToPx(36); row.setMinimumHeight(minRowHeight); for (Object data : rowData) { TextView textView = new TextView(requireContext()); textView.setText(String.valueOf(data)); textView.setTextSize(TypedValue.COMPLEX_UNIT_SP, 14); // 设置单元格内边距 int padding = dpToPx(8); textView.setPadding(padding, padding/2, padding, padding/2); // 设置单行显示 textView.setSingleLine(true); textView.setEllipsize(TextUtils.TruncateAt.END); // 创建列布局参数(正确方式) TableRow.LayoutParams colParams = new TableRow.LayoutParams( 0, // 宽度将由权重控制 TableRow.LayoutParams.MATCH_PARENT ); // 设置权重和最小宽度 colParams.weight = 1; textView.setLayoutParams(colParams); // 设置文本视图的最小宽度(这才是正确的属性) textView.setMinWidth(dpToPx(120)); // 设置最小列宽 row.addView(textView); } table.addView(row); } // 动态添加表头 private void addTableHeader(TableLayout table) { TableRow headerRow = new TableRow(requireContext()); headerRow.setBackgroundColor(ContextCompat.getColor(requireContext(), R.color.purple_500)); TableLayout.LayoutParams headerParams = new TableLayout.LayoutParams( TableLayout.LayoutParams.MATCH_PARENT, TableLayout.LayoutParams.WRAP_CONTENT ); headerRow.setLayoutParams(headerParams); String[] headers = {"订单号", "产品编号", "产品数量", "组件名", "板材信息", "板材/组件", "订购数量"}; for (String header : headers) { TextView headerView = new TextView(requireContext()); headerView.setText(header); headerView.setTextColor(Color.WHITE); headerView.setTypeface(null, Typeface.BOLD); headerView.setTextSize(TypedValue.COMPLEX_UNIT_SP, 16); int padding = dpToPx(8); headerView.setPadding(padding, padding, padding, padding); // 设置列布局参数 TableRow.LayoutParams colParams = new TableRow.LayoutParams( 0, TableRow.LayoutParams.MATCH_PARENT ); colParams.weight = 1; headerView.setLayoutParams(colParams); // 设置表头列的最小宽度 headerView.setMinWidth(dpToPx(120)); headerRow.addView(headerView); } table.addView(headerRow); } // DP转PX工具方法 private int dpToPx(int dp) { return (int) TypedValue.applyDimension( TypedValue.COMPLEX_UNIT_DIP, dp, getResources().getDisplayMetrics() ); }<?xml version="1.0" encoding="utf-8"?> <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <!-- 水平滚动容器(关键:宽度设为match_parent) --> <HorizontalScrollView android:id="@+id/scroll_horizontal" android:layout_width="match_parent" android:layout_height="match_parent" android:fillViewport="true" android:scrollbars="horizontal"> <!-- 表格容器(高度为wrap_content,宽度设为可无限扩展) --> <TableLayout android:id="@+id/orderTable" android:layout_width="wrap_content" android:layout_height="wrap_content" android:stretchColumns="*" android:shrinkColumns="*" android:paddingEnd="16dp" android:minWidth="1000dp"> <!-- 设置最小宽度防止初始压缩 --> <!-- 表格标题行(已移除原始代码中的标题行,将在Java中动态添加) --> </TableLayout> </HorizontalScrollView> <!-- 垂直滚动指示器 --> <View android:layout_width="4dp" android:layout_height="match_parent" android:layout_gravity="right" android:background="#80000000" android:visibility="invisible" android:id="@+id/vertical_scroll_indicator"/> </FrameLayout> textView.setSingleLine(true);单行不忽略,动态调整长度,总长可以延伸
06-07
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