Android TextView内容包含中英文时满行居中，不足一行则左对齐，会出现左右空格不一致。

package com.roya.shandong.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;

/**

* Created by Aphrodite on 2017/8/28.

*/

public class DialogTextView extends TextView {

private float mLineY;

private float mViewWidth;

public DialogTextView(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();

if (null == layout) {

return;

}

Paint.FontMetrics fm = paint.getFontMetrics();

int textHeight = (int) Math.ceil(fm.descent - fm.ascent);

textHeight = (int) (textHeight * layout.getSpacingMultiplier() + layout.getSpacingAdd());

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 (line.equals(“”)) {

break;

}

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 width) {

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 - width) / 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.length() == 0) {

return false;

} else {

return line.charAt(line.length() - 1) != ‘\n’;

}

}

}

借鉴：https://www.zhihu.com/question/23768161/answer/82424947