Android 解决TextView排版参差不齐的问题

在app中，展示数据时，里面有汉字、数字、特殊字符时，由于全角、半角问题导致TextView参差不齐。在网上找了许多，半角转全角并没什么用，还有其他自定义TextView都有问题。最后终于找到一个，就像Word一样，可以使文字左右两端对齐：

package com.monkey.monkeymushroom.view;import android.content.Context;import android.graphics.Canvas;import android.graphics.Paint;import android.text.Layout;import android.text.StaticLayout;import android.text.TextPaint;import android.util.AttributeSet;import android.widget.TextView;/** * 解决文字排版混乱参差不齐的问题 */public class JustifyTextView extends TextView { private int mLineY; private int mViewWidth; public static final String TWO_CHINESE_BLANK = " "; public JustifyTextView(Context context, AttributeSet attrs) { super(context, attrs); } @Override protected void onLayout(boolean changed, int left, int top, int right, int bottom) { super.onLayout(changed, left, top, right, bottom); } @Override protected void onDraw(Canvas canvas) { TextPaint paint = getPaint(); paint.setColor(getCurrentTextColor()); paint.drawableState = getDrawableState(); mViewWidth = getMeasuredWidth(); String text = getText().toString(); mLineY = 0; mLineY += getTextSize(); Layout layout = getLayout(); // layout.getLayout()在4.4.3出现NullPointerException if (layout == null) { return; } Paint.FontMetrics fm = paint.getFontMetrics(); int textHeight = (int) (Math.ceil(fm.descent - fm.ascent)); textHeight = (int) (textHeight * layout.getSpacingMultiplier() + layout .getSpacingAdd()); //解决了最后一行文字间距过大的问题 for (int i = 0; i < layout.getLineCount(); i++) { int lineStart = layout.getLineStart(i); int lineEnd = layout.getLineEnd(i); float width = StaticLayout.getDesiredWidth(text, lineStart, lineEnd, getPaint()); String line = text.substring(lineStart, lineEnd); if (i < layout.getLineCount() - 1) { if (needScale(line)) { drawScaledText(canvas, lineStart, line, width); } else { canvas.drawText(line, 0, mLineY, paint); } } else { canvas.drawText(line, 0, mLineY, paint); } mLineY += textHeight; } } private void drawScaledText(Canvas canvas, int lineStart, String line, float lineWidth) { float x = 0; if (isFirstLineOfParagraph(lineStart, line)) { String blanks = " "; canvas.drawText(blanks, x, mLineY, getPaint()); float bw = StaticLayout.getDesiredWidth(blanks, getPaint()); x += bw; line = line.substring(3); } int gapCount = line.length() - 1; int i = 0; if (line.length() > 2 && line.charAt(0) == 12288 && line.charAt(1) == 12288) { String substring = line.substring(0, 2); float cw = StaticLayout.getDesiredWidth(substring, getPaint()); canvas.drawText(substring, x, mLineY, getPaint()); x += cw; i += 2; } float d = (mViewWidth - lineWidth) / gapCount; for (; i < line.length(); i++) { String c = String.valueOf(line.charAt(i)); float cw = StaticLayout.getDesiredWidth(c, getPaint()); canvas.drawText(c, x, mLineY, getPaint()); x += cw + d; } } private boolean isFirstLineOfParagraph(int lineStart, String line) { return line.length() > 3 && line.charAt(0) == ' ' && line.charAt(1) == ' '; } private boolean needScale(String line) { if (line == null || line.length() == 0) { return false; } else { return line.charAt(line.length() - 1) != '\n'; } }}

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