关于Android的文字排版和换行有关问题，彻底解决

关于Android的文字排版和换行问题，彻底解决

package com.text.view;

import java.util.Arrays;

import android.content.Context;
import android.content.res.Resources;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.FontMetrics;
import android.graphics.Paint.Style;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.View;

public class MyView extends View {
 private Paint mPaint = new Paint();

 public MyView(Context context) {
  this(context,null);
 }

 
 public MyView(Context context, AttributeSet attrs, int defStyle) {
  super(context, attrs, defStyle);
  init();
 }

 public MyView(Context context, AttributeSet attrs) {
  this(context,attrs,0);
 }

 private void init() {
  mPaint.setAntiAlias(true);
  mPaint.setColor(Color.BLACK); 
  mPaint.setStyle(Style.STROKE);
  mPaint.setTextSize(getRawSize(TypedValue.COMPLEX_UNIT_DIP, 12));
  
 }

 @Override
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
  super.onMeasure(widthMeasureSpec, heightMeasureSpec);
//  setMeasuredDimension(300, 200);
 }
 
 @Override
 protected void onDraw(Canvas canvas) {
  super.onDraw(canvas);
  //canvas.drawColor(Color.WHITE);
  
  FontMetrics fm = mPaint.getFontMetrics();
  
  float baseline = fm.descent - fm.ascent; 
  float x = 0;
  float y =  baseline;

//注释掉的是当使用多段TextView时使用
  String txt1 = getResources().getString(com.middle.sport.R.string.more1);
  //String txt2 = getResources().getString(com.middle.sport.R.string.more2);
  //String txt3 = getResources().getString(com.middle.sport.R.string.more3);
  
  String[] text1s = autoSplit(txt1, mPaint, getWidth() - 15);
  //String[] text2s = autoSplit(txt2, mPaint, getWidth() - 15);
  //String[] text3s = autoSplit(txt3, mPaint, getWidth() - 15);
  
  System.out.printf("line indexs: %s\n", Arrays.toString(text1s));
  //System.out.printf("line indexs: %s\n", Arrays.toString(text2s));
  //System.out.printf("line indexs: %s\n", Arrays.toString(text3s));
  
  for(String text1 : text1s) { 
   canvas.drawText(text1, x, y, mPaint); 
   y += baseline + fm.leading; 
  }
     /* y += 20;
  for(String text2 : text2s) { 
   canvas.drawText(text2, x, y, mPaint); 
   y += baseline + fm.leading; 
  }
      y += 20;
  for(String text3 : text3s) { 
   canvas.drawText(text3, x, y, mPaint); 
   y += baseline + fm.leading; 
  }*/
 }
 private String[] autoSplit(String content, Paint p, float width) {
  int length = content.length();
  float textWidth = p.measureText(content);
  if(textWidth <= width) {
   return new String[]{content};
  }
  
  int start = 0, end = 1, i = 0;
  int lines = (int) Math.ceil(textWidth / width); 
  String[] lineTexts = new String[lines];
  while(start < length) {
   if(p.measureText(content, start, end) > width) {
    lineTexts[i++] = (String) content.subSequence(start, end);
    start = end;
   }
   if(end == length) { 
    lineTexts[i] = (String) content.subSequence(start, end);
    break;
   }
   end += 1;
  }
  return lineTexts;
 }
 public float getRawSize(int unit, float size) {
        Context c = getContext();
        Resources r;

        if (c == null)
            r = Resources.getSystem();
        else
            r = c.getResources();
        
        return TypedValue.applyDimension(unit, size, r.getDisplayMetrics());
    }
}