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     @Override24     protected void onLayout(boolean changed, int left, int top, int right, int bottom) {25         super.onLayout(changed, left, top, right, bottom);26     }27 28     @Override29     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 }