Android中用StaticLayout实现文本绘制自动换行详解

package com.example.amdroidstaticlayoutdemo;
import android.support.v4.app.Fragment;
import android.text.Layout.Alignment;
import android.text.StaticLayout;
import android.text.TextPaint;
import android.app.Activity;
import android.content.Context;
                                                                   
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.os.Bundle;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.os.Build;
public class MainActivity extends Activity {
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(new MyView(this));
 }
 public class MyView extends View { 
                                                                      
  Paint mPaint; //画笔,包含了画几何图形、文本等的样式和颜色信息 
  public MyView(Context context) { 
   super(context);  
  } 
                                                                      
  public MyView(Context context, AttributeSet attrs){ 
   super(context, attrs); 
  } 
                                                                      
  public void onDraw(Canvas canvas){ 
   super.onDraw(canvas); 
   TextPaint tp = new TextPaint();
   tp.setColor(Color.BLUE);
   tp.setStyle(Style.FILL);
   tp.setTextSize(50);
   String message = "paint,draw paint指用颜色画,如油画颜料、水彩或者水墨画,而draw 通常指用铅笔、钢笔或者粉笔画,后者一般并不涂上颜料。两动词的相应名词分别为p";
   StaticLayout myStaticLayout = new StaticLayout(message, tp, canvas.getWidth(), Alignment.ALIGN_NORMAL, 1.0f, 0.0f, false);
   myStaticLayout.draw(canvas);
   canvas.restore();
  } 
 } 
}

public StaticLayout(CharSequence source,
     TextPaint paint,
     int width,
     Layout.Alignment align,
     float spacingmult,
     float spacingadd,
     boolean includepad)
     
public StaticLayout(CharSequence source,
     int bufstart,
     int bufend,
     TextPaint paint,
     int outerwidth,
     Layout.Alignment align,
     float spacingmult,
     float spacingadd,
     boolean includepad)
     
public StaticLayout(CharSequence source,
     int bufstart,
     int bufend,
     TextPaint paint,
     int outerwidth,
     Layout.Alignment align,
     float spacingmult,
     float spacingadd,
     boolean includepad,
     TextUtils.TruncateAt ellipsize,
     int ellipsizedWidth)