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

来源：http://blog.csdn.net/asddavid/article/details/77233131