Android设计模式之Builder模式详解

builder模式使用链式结构创建复杂对象，将过程与结果分开，创建过程中可以自行组合。

使用场景

一个对象，不同组合,不同顺序生成不同的结果
优点：封装性更规范，程序调用不用关系内部细节，注重结果即可
缺点：如果builder对象过多，会加大内存消耗

public class tabinfobean {

 private int count;//tab的个数 必选
 private int currenttab;//默认选中的tab 必选
 private string[] tabtext;//文字必选


 private int normalresid;//可选
 private int selectresid;//可选
 private int normaltextcolor;//可选
 private int selecttextcolor;//可选
 private int normaltextsizesp;//可选
 private int selecttextsizesp;//可选


 private tabinfobean(tabinfobuilder builder) {
  this.tabtext = builder.tabtext;
  this.count = builder.count;
  this.currenttab = builder.currenttab;

  this.normalresid = builder.normalresid;
  this.selectresid = builder.selectresid;

  this.normaltextcolor = builder.normaltextcolor;
  this.selecttextcolor = builder.selecttextcolor;
  this.normaltextsizesp = builder.normaltextsizesp;
  this.selecttextsizesp = builder.selecttextsizesp;
 }

 public int getcount() {
  return count;
 }

 public void setcount(int count) {
  this.count = count;
 }

 public int getcurrenttab() {
  return currenttab;
 }

 public void setcurrenttab(int currenttab) {
  this.currenttab = currenttab;
 }

 public int getnormalresid() {
  return normalresid;
 }

 public void setnormalresid(int normalresid) {
  this.normalresid = normalresid;
 }

 public int getselectresid() {
  return selectresid;
 }

 public void setselectresid(int selectresid) {
  this.selectresid = selectresid;
 }

 public int getnormaltextcolor() {
  return normaltextcolor;
 }

 public void setnormaltextcolor(int normaltextcolor) {
  this.normaltextcolor = normaltextcolor;
 }

 public int getselecttextcolor() {
  return selecttextcolor;
 }

 public void setselecttextcolor(int selecttextcolor) {
  this.selecttextcolor = selecttextcolor;
 }

 public string[] gettabtext() {
  return tabtext;
 }

 public void settabtext(string[] tabtext) {
  this.tabtext = tabtext;
 }


 public int getnormaltextsizesp() {
  return normaltextsizesp;
 }

 public void setnormaltextsizesp(int normaltextsizesp) {
  this.normaltextsizesp = normaltextsizesp;
 }

 public int getselecttextsizesp() {
  return selecttextsizesp;
 }

 public void setselecttextsizesp(int selecttextsizesp) {
  this.selecttextsizesp = selecttextsizesp;
 }

 public static class tabinfobuilder {
  private int count;
  private int currenttab;
  private string[] tabtext;

  private int normalresid;
  private int selectresid;
  private int normaltextcolor;
  private int selecttextcolor;
  private int normaltextsizesp;//可选
  private int selecttextsizesp;//可选

  public tabinfobuilder(string[] tabtext, int count, int currenttab) {
   this.tabtext = tabtext;
   this.count = count;
   this.currenttab = currenttab;
  }

  public tabinfobuilder setnormalresid(int normalresid) {
   this.normalresid = normalresid;
   return this;
  }

  public tabinfobuilder setselectresid(int selectresid) {
   this.selectresid = selectresid;
   return this;
  }

  public tabinfobuilder setnormaltextcolor(int normaltextcolor) {
   this.normaltextcolor = normaltextcolor;
   return this;
  }

  public tabinfobuilder setselecttextcolor(int selecttextcolor) {
   this.selecttextcolor = selecttextcolor;
   return this;
  }

  public tabinfobuilder setnormaltextsizesp(int size) {
   this.normaltextsizesp = size;
   return this;
  }

  public tabinfobuilder setselecttextsizesp(int size) {
   this.selecttextsizesp = size;
   return this;
  }


  public tabinfobean build() {
   return new tabinfobean(this);
  }
 }
}

调用方式

string[] name={"我","是","谁"};
  tabinfobean.tabinfobuilder tabinfobuilder=new tabinfobean.tabinfobuilder(name,5,0);
  /* tabinfobean tabinfobean=tabinfobuilder
    .setnormalresid()
    .setselectresid()
    .setnormaltextcolor()
    .setselecttextcolor()
    .setnormaltextsizesp()
    .setselecttextsizesp()
    .build();*/

github代码地址

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