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,line,width);

} else {

canvas.drawText(line,mLineY,paint);

}

} else {

canvas.drawText(line,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,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,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,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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