一、问题描述:
Android的TextView在显示文字的时候,如果有段中文有英文,有中文,有中文标点符号,你会发现,当要换行的时候遇到中文标点,
这一行就会空出很多空格出来。原因是:
1) TextView在显示中文的时候 标点符号不能显示在一行的行首和行尾,如果一个标点符号刚好在一行的行尾,该标点符号就会连同前一个字符跳到下一行显示;
2)一个英文单词不能被显示在两行中( TextView在显示英文时,标点符号是可以放在行尾的,但英文单词也不能分开 );
3)全角和半角的问题,汉字无论全角还是半角都是占2个字节,英文和符号在半角是占一个字节,全角是占两个字节。
二、解决方法
参考资料中:http://niufc.iteye.com/blog/1729792
可能由于时间问题,都没有很好解决我的问题。将textview中的字符全角化没有效果,去除特殊字符或将所有中文标号替换为英文标号。这个有点效果,但是产品经理说文案不符合标准。改源代码担心出问题,影响其他的应用。自定义TextView时,canvas.setViewport()这个方法的api被删了。然后各种百度查资料,很多都是转过来转过去。然并卵。后面找了好久才找到一个靠谱的。完美的解决了我的问题。
自定义TextView(直接把代码拷进去就能用)
package com.lhx.widget;
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;
/**
* @author lhx
* @Date 9/8/15
*/
public class MyTextView extends TextView {
private int mLineY;
private int mViewWidth;
public MyTextView(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';
}
}
}
<!--工作时间提醒-->
<LinearLayout
android:layout_width="match_parent"
android:id="@+id/ll_chat"
android:background="@color/topbar_chat"
android:layout_height="wrap_content">
<com.lhx.widget.MyTextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/tv_reminder"
android:layout_marginTop="5dp"
android:layout_marginBottom="5dp"
android:layout_marginRight="8dp"
android:layout_marginLeft="8dp"
android:text = "服务商不管以任何形式要求线下交易,都存在诈骗的风险,请提高警惕。This is test!欢迎相互关注。有不对的地方望指出和包容。谢谢! "
android:textColor="@color/text_orange_1"/>
</LinearLayout>
以上就很好的解决了TextView中英文字符排版的问题,折腾了好久终于搞定。希望对您有点帮助。