1 package com.sixin.view;
2
3 import android.content.Context;
4 import android.graphics.Canvas;
5 import android.text.Layout;
6 import android.text.StaticLayout;
7 import android.text.TextPaint;
8 import android.util.AttributeSet;
9 import android.widget.TextView;
10
11 /**
12 * 能够自动修正的textview，解决android自带textview右侧文字不能对齐的问题
13 */
14 public class JustifyTextView extends TextView {
15
16 private int mLineY;
17 private int mViewWidth;
18
19 public JustifyTextView(Context context, AttributeSet attrs) {
20 super(context, attrs);
21 }
22
23 @Override
24 protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
25 super.onLayout(changed, left, top, right, bottom);
26 }
27
28 @Override
29 protected void onDraw(Canvas canvas) {
30 TextPaint paint = getPaint();
31 paint.setColor(getCurrentTextColor());
32 paint.drawableState = getDrawableState();
33 mViewWidth = getMeasuredWidth();
34 String text = (String) getText();
35 mLineY = 0;
36 mLineY += getTextSize();
37 Layout layout = getLayout();
38 for (int i = 0; i < layout.getLineCount(); i++) {
39 int lineStart = layout.getLineStart(i);
40 int lineEnd = layout.getLineEnd(i);
41 String line = text.substring(lineStart, lineEnd);
42
43 float width = StaticLayout.getDesiredWidth(text, lineStart, lineEnd, getPaint());
44 if (needScale(line)) {
45 drawScaledText(canvas, lineStart, line, width);
46 } else {
47 canvas.drawText(line, 0, mLineY, paint);
48 }
49
50 mLineY += getLineHeight();
51 }
52 }
53
54 private void drawScaledText(Canvas canvas, int lineStart, String line, float lineWidth) {
55 float x = 0;
56 if (isFirstLineOfParagraph(lineStart, line)) {
57 String blanks = " ";
58 canvas.drawText(blanks, x, mLineY, getPaint());
59 float bw = StaticLayout.getDesiredWidth(blanks, getPaint());
60 x += bw;
61
62 line = line.substring(3);
63 }
64
65 float d = (mViewWidth - lineWidth) / line.length() - 1;
66 for (int i = 0; i < line.length(); i++) {
67 String c = String.valueOf(line.charAt(i));
68 float cw = StaticLayout.getDesiredWidth(c, getPaint());
69 canvas.drawText(c, x, mLineY, getPaint());
70 x += cw + d;
71 }
72 }
73
74 private boolean isFirstLineOfParagraph(int lineStart, String line) {
75 return line.length() > 3 && line.charAt(0) == ' ' && line.charAt(1) == ' ';
76 }
77
78 private boolean needScale(String line) {
79 if (line.length() == 0) {
80 return false;
81 } else {
82 return line.charAt(line.length() - 1) != '\n';
83 }
84 }
85
86 }
