解决android自带textview右侧文字不能对齐的问题

 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 }