java枚举在android项目应用
2014-06-12 12:21
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今天修复一个公司很早以前的android应用功能,里面的代码逻辑已经完全错乱,然后发现返回的数据完全不对了。然后修复了整整两天。然后我重新整理了一遍,重构就算不上了。然后就用上了枚举。
什么是枚举?我以前也不懂,当时我看见公司的项目中使用了枚举当做项目一个控制,比如修改已经写好的app然后为一些手机厂商做定制版。可能要去掉广告,还有跳转到商店url都不同,特别是国内基本都没有google play。我们为了避免以后的修改,就会写个枚举来控制它。
[java] view plaincopyprint?
public enum Market {
Default,Huawei(){
@Override
public String getMarketUrl() {
return "http://play.huawei.com";//huawei market url
}
},ZTE(){
@Override
public boolean isShouldAd(){
return
false;
}
@Override
public String getMarketUrl() {
return
"http://play.zte.com";//ZTE market url
}
},OneTouch(){
@Override
public String getMarketUrl() {
return "http://play.huawei.com";
}
};
public boolean isShouldAd(){
return true;
}
public String getMarketUrl(){
return "http:\\googleplay....";//google play url
}
}
[java] view plaincopyprint?
public enum Market {
Default,Huawei(){
@Override
public String getMarketUrl() {
return "http://play.huawei.com";//huawei market url
}
},ZTE(){
@Override
public boolean isShouldAd(){
return
false;
}
@Override
public String getMarketUrl() {
return
"http://play.zte.com";//ZTE market url
}
},OneTouch(){
@Override
public String getMarketUrl() {
return "http://play.huawei.com";
}
};
public boolean isShouldAd(){
return true;
}
public String getMarketUrl(){
return "http:\\googleplay....";//google play url
}
}
通过上面的例子就大概了解了一些java枚举在android的基本使用。为了了解java枚举的原理,我写了一个很常用的红绿灯例子。下面是用枚举的代码:
[java] view plaincopyprint?
public enum TrafficLight {
red(45) {
@Override
public TrafficLight nextLamp() {
return green;
}
},
green(30) {
@Override
public TrafficLight nextLamp() {
return yellow;
}
},
yellow(3) {
eed2
@Override
public TrafficLight nextLamp() {
return red;
}
};
private int time;
private TrafficLight(int time) {
this.time = time;
};
public abstract TrafficLight nextLamp();
public int getTime() {
return this.time;
}
}
[java] view plaincopyprint?
public enum TrafficLight {
red(45) {
@Override
public TrafficLight nextLamp() {
return green;
}
},
green(30) {
@Override
public TrafficLight nextLamp() {
return yellow;
}
},
yellow(3) {
@Override
public TrafficLight nextLamp() {
return red;
}
};
private int time;
private TrafficLight(int time) {
this.time = time;
};
public abstract TrafficLight nextLamp();
public int getTime() {
return this.time;
}
}
[java] view plaincopyprint?
public abstractclass TrafficLight {
public staticfinal TrafficLight red =
new TrafficLight(45){
@Override
public TrafficLight nextLamp() {
return green;
}
};
public staticfinal TrafficLight green =
new TrafficLight(30) {
@Override
public TrafficLight nextLamp() {
return yellow;
}
};
public staticfinal TrafficLight yellow =
new TrafficLight(3) {
@Override
public TrafficLight nextLamp() {
return red;
}
};
private int time;
private TrafficLight(int time) {
this.time = time;
};
public abstract TrafficLight nextLamp();
public int getTime() {
return this.time;
}
}
[java] view plaincopyprint?
public abstract
class TrafficLight {
public static
final TrafficLight red = new TrafficLight(45){
@Override
public TrafficLight nextLamp() {
return green;
}
};
public static
final TrafficLight green = new TrafficLight(30) {
@Override
public TrafficLight nextLamp() {
return yellow;
}
};
public static
final TrafficLight yellow = new TrafficLight(3) {
@Override
public TrafficLight nextLamp() {
return red;
}
};
private int time;
private TrafficLight(int time) {
this.time = time;
};
public abstract TrafficLight nextLamp();
public int getTime() {
return this.time;
}
}
这些都是enum的一些基本应用。然后是我今天在项目如何应用用枚举的类型的。因为我们那个app有三个不同的请求数据的url。其实我们只有一个数据源,如果find不到,就会通过其他两个是读取其他网站html,然后解析,通过正则表达式匹配得到数据。每个数据源需要设置httpClient、httpGet、httpResponse等参数,然后使用了枚举。我这里贴出一点基本的。然后发现其实都是差不多的。
[java] view plaincopyprint?
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
public enum RequestedProvider {
mySelf() {
@Override
public String getUrl(String keyWord) {
return "http://..." + keyWord +"...";
}...
},
google() {
@Override
public String getUrl(String keyWord) {
return "http://google..." + keyWord +"...";
}...
},
amazon() {
@Override
public String getUrl(String keyWord) {
return "http://amazon..." + keyWord +"...";
}...
};
public abstract String getUrl(String keyWord);
public HttpClient pickHttpClient() {
return new DefaultHttpClient();
}
public HttpGet pickHttpGet(String url) {
return new HttpGet(url);
}
public HttpResponse pickHttpResponse(HttpClient client, HttpGet get) {
HttpResponse res = null;
try {
res = client.execute(get);
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return res;
}...
}
什么是枚举?我以前也不懂,当时我看见公司的项目中使用了枚举当做项目一个控制,比如修改已经写好的app然后为一些手机厂商做定制版。可能要去掉广告,还有跳转到商店url都不同,特别是国内基本都没有google play。我们为了避免以后的修改,就会写个枚举来控制它。
[java] view plaincopyprint?
public enum Market {
Default,Huawei(){
@Override
public String getMarketUrl() {
return "http://play.huawei.com";//huawei market url
}
},ZTE(){
@Override
public boolean isShouldAd(){
return
false;
}
@Override
public String getMarketUrl() {
return
"http://play.zte.com";//ZTE market url
}
},OneTouch(){
@Override
public String getMarketUrl() {
return "http://play.huawei.com";
}
};
public boolean isShouldAd(){
return true;
}
public String getMarketUrl(){
return "http:\\googleplay....";//google play url
}
}
[java] view plaincopyprint?
public enum Market {
Default,Huawei(){
@Override
public String getMarketUrl() {
return "http://play.huawei.com";//huawei market url
}
},ZTE(){
@Override
public boolean isShouldAd(){
return
false;
}
@Override
public String getMarketUrl() {
return
"http://play.zte.com";//ZTE market url
}
},OneTouch(){
@Override
public String getMarketUrl() {
return "http://play.huawei.com";
}
};
public boolean isShouldAd(){
return true;
}
public String getMarketUrl(){
return "http:\\googleplay....";//google play url
}
}
public enum Market { Default,Huawei(){ @Override public String getMarketUrl() { return "http://play.huawei.com";//huawei market url } },ZTE(){ @Override public boolean isShouldAd(){ return false; } @Override public String getMarketUrl() { return "http://play.zte.com";//ZTE market url } },OneTouch(){ @Override public String getMarketUrl() { return "http://play.huawei.com"; } }; public boolean isShouldAd(){ return true; } public String getMarketUrl(){ return "http:\\googleplay....";//google play url } }
通过上面的例子就大概了解了一些java枚举在android的基本使用。为了了解java枚举的原理,我写了一个很常用的红绿灯例子。下面是用枚举的代码:
[java] view plaincopyprint?
public enum TrafficLight {
red(45) {
@Override
public TrafficLight nextLamp() {
return green;
}
},
green(30) {
@Override
public TrafficLight nextLamp() {
return yellow;
}
},
yellow(3) {
eed2
@Override
public TrafficLight nextLamp() {
return red;
}
};
private int time;
private TrafficLight(int time) {
this.time = time;
};
public abstract TrafficLight nextLamp();
public int getTime() {
return this.time;
}
}
[java] view plaincopyprint?
public enum TrafficLight {
red(45) {
@Override
public TrafficLight nextLamp() {
return green;
}
},
green(30) {
@Override
public TrafficLight nextLamp() {
return yellow;
}
},
yellow(3) {
@Override
public TrafficLight nextLamp() {
return red;
}
};
private int time;
private TrafficLight(int time) {
this.time = time;
};
public abstract TrafficLight nextLamp();
public int getTime() {
return this.time;
}
}
public enum TrafficLight { red(45) { @Override public TrafficLight nextLamp() { return green; } }, green(30) { @Override public TrafficLight nextLamp() { return yellow; } }, yellow(3) { @Override public TrafficLight nextLamp() { return red; } }; private int time; private TrafficLight(int time) { this.time = time; }; public abstract TrafficLight nextLamp(); public int getTime() { return this.time; } }然后是普通class模拟enum的代码:
[java] view plaincopyprint?
public abstractclass TrafficLight {
public staticfinal TrafficLight red =
new TrafficLight(45){
@Override
public TrafficLight nextLamp() {
return green;
}
};
public staticfinal TrafficLight green =
new TrafficLight(30) {
@Override
public TrafficLight nextLamp() {
return yellow;
}
};
public staticfinal TrafficLight yellow =
new TrafficLight(3) {
@Override
public TrafficLight nextLamp() {
return red;
}
};
private int time;
private TrafficLight(int time) {
this.time = time;
};
public abstract TrafficLight nextLamp();
public int getTime() {
return this.time;
}
}
[java] view plaincopyprint?
public abstract
class TrafficLight {
public static
final TrafficLight red = new TrafficLight(45){
@Override
public TrafficLight nextLamp() {
return green;
}
};
public static
final TrafficLight green = new TrafficLight(30) {
@Override
public TrafficLight nextLamp() {
return yellow;
}
};
public static
final TrafficLight yellow = new TrafficLight(3) {
@Override
public TrafficLight nextLamp() {
return red;
}
};
private int time;
private TrafficLight(int time) {
this.time = time;
};
public abstract TrafficLight nextLamp();
public int getTime() {
return this.time;
}
}
public abstract class TrafficLight { public static final TrafficLight red = new TrafficLight(45){ @Override public TrafficLight nextLamp() { return green; } }; public static final TrafficLight green = new TrafficLight(30) { @Override public TrafficLight nextLamp() { return yellow; } }; public static final TrafficLight yellow = new TrafficLight(3) { @Override public TrafficLight nextLamp() { return red; } }; private int time; private TrafficLight(int time) { this.time = time; }; public abstract TrafficLight nextLamp(); public int getTime() { return this.time; } }通过两个比较,就会发现,其实枚举就是普通的java类,只是私有了构造方法,然后提供了几个static final 的实例变量。当然enum还提供一些其他方法。比如:TrafficLight.green.name()还是非常好用的。
这些都是enum的一些基本应用。然后是我今天在项目如何应用用枚举的类型的。因为我们那个app有三个不同的请求数据的url。其实我们只有一个数据源,如果find不到,就会通过其他两个是读取其他网站html,然后解析,通过正则表达式匹配得到数据。每个数据源需要设置httpClient、httpGet、httpResponse等参数,然后使用了枚举。我这里贴出一点基本的。然后发现其实都是差不多的。
[java] view plaincopyprint?
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
public enum RequestedProvider {
mySelf() {
@Override
public String getUrl(String keyWord) {
return "http://..." + keyWord +"...";
}...
},
google() {
@Override
public String getUrl(String keyWord) {
return "http://google..." + keyWord +"...";
}...
},
amazon() {
@Override
public String getUrl(String keyWord) {
return "http://amazon..." + keyWord +"...";
}...
};
public abstract String getUrl(String keyWord);
public HttpClient pickHttpClient() {
return new DefaultHttpClient();
}
public HttpGet pickHttpGet(String url) {
return new HttpGet(url);
}
public HttpResponse pickHttpResponse(HttpClient client, HttpGet get) {
HttpResponse res = null;
try {
res = client.execute(get);
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return res;
}...
}
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