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搭徏React环境�Q�运行React��目

Terry Zou — Thu, 16 Apr 2020 07:25:00 GMT

1.必须安装nodejs
2.安装cnpm用cnpm替代npm
地址�Q�http://npm.taobao.org/

安装cnpm:

npm install -g cnpm --registry=https://registry.npm.taobao.org

3、用yarn替代npm

yarn的安装：

�W�一�U�方法：参考官�Ҏ��档https://yarn.bootcss.com/

�W�二�U�方法：cnpm install -g yarn 或�?npm install -g yarn

4、搭建React开发环境的�W�一�U�方法（�?现在推荐�Q�：

https://reactjs.org/docs/create-a-new-react-app.html

1、必��要安装nodejs 注意�Q�安装nodejs�E�_��版本教程中的nodejs版本:v8.11.2 教程中的npm版本:v5.6.0

2.安装脚手架工�?nbsp; �Q�单文�g�l��g��目生成工具�Q?nbsp; 只需要安装一��?/div>

npm install -g create-react-app / cnpm install -g create-react-app

3.创徏��目 �Q�可能创建多�ơ）

扑ֈ��目要创建的目录�Q?/div>

create-react-app reactdemo

4.cd 到项目里�?span style="white-space:pre">

cd reactdemo

npm start yarn start�q�行��目

npm run build yarn build 生成��目

5、搭建React的开发环境的�W�二�U�方法（�?未来推荐�Q�：

https://reactjs.org/docs/create-a-new-react-app.html

1、必��要安装nodejs 注意�Q�安装nodejs�E�_��版本教程中的nodejs版本:v8.11.2 教程中的npm版本:v5.6.0

2.安装脚手架工具�ƈ创徏��目

扑ֈ��目要创建的目录执行�Q?/div>

npx create-react-app reactdemo

4.cd 到项目里�?span style="white-space: pre;">

cd reactdemo

npm start �q�行��目�Q�调试）

npm run build 生成��目�Q�发布）

npx介绍�Q?/div>

npm v5.2.0引入的一条命令（npx�Q�，引入�q�个命��o的目的是��Z��提升开发者��用包内提供的命��o行工��L��体验�?/div>

详情�Q?/div>

npx create-react-app reactdemo�q�条命��o会��时安�?create-react-app 包，命��o完成后create-react-app 会删掉，不会出现�?global 中。下�ơ再执行�Q�还是会重新临时安装�?/div>

npx 会帮你执行依赖包里的二进制文件�?/div>

再比�?npx http-server 可以一句话帮你开启一个静态服务器

Terry Zou 2020-04-16 15:25 发表评论

Spring @PostConstruct 、@Autowired和Construct ��序

Terry Zou — Thu, 09 Apr 2020 07:29:00 GMT

@PostConstruct

PostConstruct注释用于在完成依赖项注入以执行�Q何初始化之后需要执行的�Ҏ��。必���d���c�L��入��用之前调用此�Ҏ���?
所有支持依赖注入的�c�都必须支持此注释。即使类没有��h��注入��M��资源�Q�也必须调用使用PostConstruct注释的方法�?
只有一个方法可以��用此�Ҏ���q�行�Ҏ���?
应用PostConstruct注释的方法必���L�����以下所有条�Ӟ��除了拦截器之外，�Ҏ���l�不能有��M��参数�Q�在�q�种情况下它采用Interceptor规范定义的InvocationContext对象�?
在拦截器�c�M��定义的方法必���d��有以下签名之一�Q?
void <METHOD>�Q�InvocationContext�Q�Object <METHOD>�Q�InvocationContext�Q�抛出异常注意：
PostConstruct拦截器方法不能抛出应用程序异常，但可以声明它抛出���查异常，包括java.lang.Exception�Q?
如果相同的拦截器�Ҏ��除了生命周期事�g之外插入业务或超时方法�?
如果PostConstruct拦截器方法返回一个��|��容器���忽略它�?
在非拦截器类上定义的�Ҏ��必须��h��以下�{�֐��Q?span class="token keyword" style="box-sizing: border-box; list-style: inherit; color: #cc99cd;">void <METHOD>�Q�）应用PostConstruct的方法可以是public�Q?span class="token keyword" style="box-sizing: border-box; list-style: inherit; color: #cc99cd;">protected�Q?span class="token keyword" style="box-sizing: border-box; list-style: inherit; color: #cc99cd;">package private�?span class="token keyword" style="box-sizing: border-box; list-style: inherit; color: #cc99cd;">private�?
除应用程序客��L��外，该方法绝不能是静态的�?
该方法可能是最�l�的。如果该�Ҏ��抛出一个未�l�检查的异常�Q�那么该�cȝ��不能投入使用�Q�除非EJB可以处理异常甚至从它们恢复的EJB

然后��׃��思考问题，�q�个注释是修饰初始化之后需要执行的�Ҏ��Q�那么它和@Autowired、构造函数的执行��序是什么呢�Q�（当然注释中已�l�说明了PostConstruct注释用于在完成依赖项注入之后�Q?br />

@Service
public class BeanA {

    @Autowired
    private BeanB beanB;

    public BeanA() {
        System.out.println("�q�是Bean A 的构造方�?);
    }
    @PostConstruct
    private void init() {
        System.out.println("�q�是BeanA�?nbsp;init �Ҏ��");
        beanB.testB();
    }
}

@Service
public class BeanB {

    @PostConstruct
    private void init() {
        System.out.println("�q�是BeanB 的init �Ҏ��");
    }
    public BeanB() {
        System.out.println("�q�是Bean B�?nbsp;构造方�?);
    }
    void testB() {
        System.out.println("�q�是Bean B �?nbsp;testB �Ҏ��");
    }
}

启动后输�?

�q�是Bean A 的构造方�?
�q�是Bean B�?构造方�?
�q�是BeanB 的init �Ҏ�� 
�q�是BeanA�?init �Ҏ�� 
�q�是Bean B �?testB �Ҏ��

所以得到结论： 构造方�?> @Autowired > @PostConstruct

Terry Zou 2020-04-09 15:29 发表评论

Spring中的ApplicationListener的��用详解案例（观察者模�?

Terry Zou — Thu, 09 Apr 2020 06:47:00 GMT

1、ApplicationContext

Spring的核心，Context我们通常解释��Z��下文环境。ApplicationContext则是应用的容器�?Spring把Bean�Q�object�Q�放在容器中�Q�需要用��通过get�Ҏ��取出来。在ApplicationContext接口的众多实现类中，�?个是我们�l�常用到的（见表1-1�Q�，�q�且使用�q?个实现类也基本能满��我们Java EE应用开发中的绝大部分需求�?/div>

�?-1 ApplicationContext接口的常用实现类介绍

ClassPathXmlApplicationContext

从类路径ClassPath中寻找指定的XML配置文�g�Q�找到�ƈ装蝲完成ApplicationContext的实例化工作。例如： //装蝲单个配置文�g实例化ApplicationContext容器

ApplicationContext cxt = new ClassPathXmlApplicationContext("applicationContext.xml");

//装蝲多个配置文�g实例化ApplicationContext容器

String[] configs = {"bean1.xml","bean2.xml","bean3.xml"};

ApplicationContext cxt = new ClassPathXmlApplicationContext(configs);

FileSystemXmlApplicationContext

从指定的文�g�pȝ��路径中寻找指定的XML配置文�g�Q�找到�ƈ装蝲完成ApplicationContext的实例化工作。例如：//装蝲单个配置文�g实例化ApplicationContext容器

ApplicationContext cxt = new FileSystemXMLApplicationContext("beans.xml");

//装蝲多个配置文�g实例化ApplicationContext容器

String[] configs = {"c:/beans1.xml","c:/beans2.xml"};

ApplicationContext cxt = new FileSystemXmlApplicationContext(configs);

XmlWebApplicationContext

从Web应用中寻找指定的XML配置文�g�Q�找到�ƈ装蝲完成ApplicationContext的实例化工作。这是�ؓWeb工程量��n定制的，使用WebApplicationContextUtils�cȝ��getRequiredWebApplicationContext�Ҏ��可在JSP与Servlet中取得IoC容器的引�?/div>

2、ApplicationEvent
是个抽象�c�，里面只有一个构造函数和一个长整型的timestamp。其源码如下

public abstract class ApplicationEvent extends EventObject {

    /** use serialVersionUID from Spring 1.2 for interoperability */
    private static final long serialVersionUID = 7099057708183571937L;

    /** System time when the event happened */
    private final long timestamp;

    /**
     * Create a new ApplicationEvent.
     * @param source the object on which the event initially occurred (never {@code null})
     */
    public ApplicationEvent(Object source) {
        super(source);
        this.timestamp = System.currentTimeMillis();
    }

    /**
     * Return the system time in milliseconds when the event happened.
     */
    public final long getTimestamp() {
        return this.timestamp;
    }
}

3、ApplicationListener

是一个接口，里面只有一个onApplicationEvent�Ҏ��。如果在上下文中部��v一个实��C��ApplicationListener接口的bean,那么每当在一个ApplicationEvent发布�?ApplicationContext�Ӟ��调用ApplicationContext.publishEvent()�Ҏ��Q�这个bean得到通知。类��g��Oberver设计模式�?/span>

其源码如下：

public interface ApplicationListenerextends ApplicationEvent> extends EventListener {
    /**
     * Handle an application event.
     * @param event the event to respond to
     */
    void onApplicationEvent(E event);

}

下面举个例子
自定义事件NotifyEvent:

import org.springframework.context.ApplicationEvent;

public class NotifyEvent  extends ApplicationEvent  {
    private String email;
    private String content;
    public NotifyEvent(Object source){
        super(source);
    }

    public NotifyEvent(Object source,String email,String content){
        super(source);
        this.email = email;
        this.content = content;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }
}

定义监听器NotifyListener:

import org.springframework.context.ApplicationListener;
import org.springframework.context.annotation.Configuration;

@Configuration
public class NotifyListener implements ApplicationListener{
    @Override
    public void onApplicationEvent(NotifyEvent event) {
        System.out.println("邮�g地址�Q? + event.getEmail());
        System.out.println("邮�g内容�Q? + event.getContent());
    }
}

单元��试�c�ListenerTest�Q?/span>

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import org.springframework.web.context.WebApplicationContext;

@RunWith(SpringRunner.class)
@SpringBootTest(classes = ServerLauncher.class, webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
public class ListenerTest {
    @Autowired
    private WebApplicationContext webApplicationContext;

    @Test
    public void testListener(){
        NotifyEvent event = new NotifyEvent("object","abc@qq.com","This is the content");
        webApplicationContext.publishEvent(event);
    }
}

Terry Zou 2020-04-09 14:47 发表评论

Terry Zou — Thu, 09 Apr 2020 01:10:00 GMT

之前用户使用的是3个注解注解他们的main�c�R��分别是@Configuration,@EnableAutoConfiguration,@ComponentScan。由于这些注解一般都是一起��用，spring boot提供了一个统一的注解@SpringBootApplication�?/p>

@SpringBootApplication = (默认属�?@Configuration + @EnableAutoConfiguration + @ComponentScan�?br />

@SpringBootApplication
public class ApplicationMain {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

分开解释@Configuration,@EnableAutoConfiguration,@ComponentScan�?br />1、@Configuration�Q�提到@Configuration��p��提到他的搭档@Bean。��用这两个注解��可以创��Z��个简单的spring配置�c�，可以用来替代相应的xml配置文�g�?br />

    class="com.test.Car">


    class="com.test.Wheel">

相当于：

@Configuration
public class Conf {
    @Bean
    public Car car() {
        Car car = new Car();
        car.setWheel(wheel());
        return car;
    }
    @Bean
    public Wheel wheel() {
        return new Wheel();
    }
}

@Configuration的注解类标识�q�个�c�d��以��用Spring IoC容器作�ؓbean定义的来源。@Bean注解告诉Spring�Q�一个带有@Bean的注解方法将�q�回一个对象，该对象应该被注册为在Spring应用�E�序上下文中的bean�?br />

2、@EnableAutoConfiguration�Q�能够自动配�|�spring的上下文�Q�试囄��和配置你想要的bean�c�，通常会自动根据你的类路径和你的bean定义自动配置�?/p>

3、@ComponentScan�Q�会自动扫描指定包下的全部标有@Component的类�Q��ƈ注册成bean�Q�当然包括@Component下的子注解@Service,@Repository,@Controller�?/p>

Terry Zou 2020-04-09 09:10 发表评论

Terry Zou — Mon, 13 Jul 2015 14:10:00 GMT

package com.zhihe.xqsh.utils;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.UnsupportedEncodingException;

import java.util.Date;

import java.util.List;

import org.apache.http.HttpEntity;

import org.apache.http.HttpResponse;

import org.apache.http.HttpStatus;

import org.apache.http.HttpVersion;

import org.apache.http.NameValuePair;

import org.apache.http.client.ClientProtocolException;

import org.apache.http.client.HttpClient;

import org.apache.http.client.entity.UrlEncodedFormEntity;

import org.apache.http.client.methods.HttpGet;

import org.apache.http.client.methods.HttpPost;

import org.apache.http.conn.ClientConnectionManager;

import org.apache.http.conn.params.ConnManagerParams;

import org.apache.http.conn.params.ConnRouteParams;

import org.apache.http.conn.scheme.PlainSocketFactory;

import org.apache.http.conn.scheme.Scheme;

import org.apache.http.conn.scheme.SchemeRegistry;

import org.apache.http.conn.ssl.SSLSocketFactory;

import org.apache.http.impl.client.DefaultHttpClient;

import org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager;

import org.apache.http.impl.cookie.BasicClientCookie;

import org.apache.http.params.BasicHttpParams;

import org.apache.http.params.HttpConnectionParams;

import org.apache.http.params.HttpParams;

import org.apache.http.params.HttpProtocolParams;

import org.apache.http.util.EntityUtils;

import com.zhihe.xqsh.network.ServerErrorException;

import android.accounts.NetworkErrorException;

import android.annotation.SuppressLint;

import android.util.Log;

public class CustomerHttpClient {

private static final String TAG = CustomerHttpClient.class.getSimpleName();

private static DefaultHttpClient customerHttpClient;

private CustomerHttpClient() {

}

public static synchronized HttpClient getHttpClient() {

if (null == customerHttpClient) {

HttpParams params = new BasicHttpParams();

// 讄��K?�K��基本参数

HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);

HttpProtocolParams.setContentCharset(params, "UTF-8");

HttpProtocolParams.setUseExpectContinue(params, true);

HttpProtocolParams.setUserAgent(params, "Mozilla/5.0(Linux;U;Android 2.2.1;en-us;Nexus One Build.FRG83) "

+ "AppleWebKit/553.1(KHTML,like Gecko) Version/4.0 Mobile Safari/533.1");

// ��时讄��

/* 从连接池中取�q�接的超时时�K?*/

ConnManagerParams.setTimeout(params, 2000);

ConnManagerParams.setMaxTotalConnections(params, 800);

/* �q�接��时 */

HttpConnectionParams.setConnectionTimeout(params, 5000);

/* ��h��时 */

HttpConnectionParams.setSoTimeout(params, 10000);

// 讄��我们的HttpClient支持HTTP和HTTPS两种模式

SchemeRegistry schReg = new SchemeRegistry();

schReg.register(new Scheme("http", PlainSocketFactory.getSocketFactory(), 80));

schReg.register(new Scheme("https", SSLSocketFactory.getSocketFactory(), 443));

// 使用�U�程安全的连接管理来创徏HttpClient

ClientConnectionManager conMgr = new ThreadSafeClientConnManager(params, schReg);

// �K?�K��q�接敎ͼ�ConnManagerParams.setMaxTotalConnections(params, 50);

customerHttpClient = new DefaultHttpClient(conMgr, params);

}

return customerHttpClient;

}

/**

* 以get方式提交数据

* @param url 提交地址

* @param params 参数

* @return 响应�l�果

* @throws ServerErrorException ��h��p�|

* @throws NetworkErrorException �q�接��p�|

public static String get(String url, String params) throws ServerErrorException, NetworkErrorException {

int tryTimes = 0;

NullPointerException ex;

do {

try {

return tryGet(url, params);

} catch (NullPointerException e) {

ex = e;

tryTimes++;

}

} while (tryTimes < 3);

throw ex;

}

/**

* 以get方式提交数据

* @param url 提交地址

* @param params 参数

* @return 响应�l�果

* @throws ServerErrorException ��h��p�|

* @throws NetworkErrorException �q�接��p�|

public static String tryGet(String url, String params) throws ServerErrorException, NetworkErrorException {

try {

HttpGet request = new HttpGet(url + params);

/*if (LotteryApplication.isCmwap()) {

org.apache.http.HttpHost proxy = new org.apache.http.HttpHost("10.0.0.172", 80, "http");

HttpParams httpParams = new BasicHttpParams();

ConnRouteParams.setDefaultProxy(httpParams, proxy);

request.setParams(httpParams);

}*/

HttpClient client = getHttpClient();

HttpResponse response = client.execute(request);

if (response.getStatusLine().getStatusCode() != HttpStatus.SC_OK) {

throw new ServerErrorException("�K��K��K��K��æ�K��K��K�Ժ��K��K��");

}

HttpEntity resEntity = response.getEntity();

String result = (resEntity == null) ? null : EntityUtils.toString(resEntity, "UTF-8");

return result;

} catch (UnsupportedEncodingException e) {

logw(e.getMessage());

return null;

} catch (ClientProtocolException e) {

logw(e.getMessage());

return null;

} catch (IOException e) {

throw new NetworkErrorException("�K��K��Ԍ��K�U��K��K��K��K��K��K��K��", e);

}

private static void logw(String string) {

if (string != null) {

Log.w(TAG, string);

}

/**

* 以post方式提交数据

* @param url 提交地址

* @param params 参数

* @return 响应�l�果

* @throws ServerErrorException ��h��p�|

* @throws NetworkErrorException �q�接��p�|

public static String post(String url, List params) throws ServerErrorException, NetworkErrorException {

return post(url, params, null);

}

/**

* 以post方式提交数据

* @param url 提交地址

* @param params 参数

* @param soTimeout 响应��时旉��Q�单位毫�K?

* @return 响应�l�果

* @throws ServerErrorException ��h��p�|

* @throws NetworkErrorException �q�接��p�|

public static String post(String url, List params, int soTimeout) throws ServerErrorException,

NetworkErrorException {

HttpParams httpParams;

if (soTimeout <= 0) {

httpParams = null;

} else {

httpParams = new BasicHttpParams();

HttpConnectionParams.setSoTimeout(httpParams, soTimeout);

}

return post(url, params, httpParams);

}

/**

* 以post方式提交数据

* @param url 提交地址

* @param params 参数

* @param httpParams http参数

* @return 响应�l�果

* @throws ServerErrorException ��h��p�|

* @throws NetworkErrorException �q�接��p�|

public static String post(String url, List params, HttpParams httpParams) throws ServerErrorException,

NetworkErrorException {

int tryTimes = 0;

NullPointerException ex;

do {

try {

return tryPost(url, params, httpParams);

} catch (NullPointerException e) {

ex = e;

tryTimes++;

}

} while (tryTimes < 3);

throw ex;

}

/**

* 以post方式提交数据

* @param url 提交地址

* @param params 参数

* @param httpParams http参数

* @return 响应�l�果

* @throws ServerErrorException ��h��p�|

* @throws NetworkErrorException �q�接��p�|

public static String tryPost(String url, List params, HttpParams httpParams) throws ServerErrorException,

NetworkErrorException {

try {

HttpPost request = new HttpPost(url);

if (params != null && params.size() > 0) {

request.setEntity(new UrlEncodedFormEntity(params, "UTF-8"));

}

// if (LotteryApplication.isCmwap()) {

// org.apache.http.HttpHost proxy = new org.apache.http.HttpHost("10.0.0.172", 80, "http");

// if (httpParams == null)

// httpParams = new BasicHttpParams();

// ConnRouteParams.setDefaultProxy(httpParams, proxy);

// }

if (httpParams != null)

request.setParams(httpParams);

//Log.v("CS", params.toString());

HttpClient client = getHttpClient();

HttpResponse response = client.execute(request);

if (response.getStatusLine().getStatusCode() != HttpStatus.SC_OK) {

//Log.v("CS", params.toString());

//Log.v("CS", response.getStatusLine().getStatusCode() + "");

request.abort();

throw new ServerErrorException("�K��K��K��K��æ�K��K��K�Ժ��K��K��");

}

if (response.getStatusLine ().getStatusCode () != 200) {

request.abort(); //�K��Ӟ��K��K��,�K��K��K��K��K�Կ�ʼ�K��һ�K��K��K��

return null;

}

HttpEntity resEntity = response.getEntity();

String result = (resEntity == null) ? null : EntityUtils.toString(resEntity, "UTF-8");

//Log.v("CS", params.toString() + "||||" + result);

return result;

} catch (UnsupportedEncodingException e) {

logw(e.getMessage());

return null;

} catch (ClientProtocolException e) {

logw(e.getMessage());

return null;

} catch (IOException e) {

throw new NetworkErrorException(e.getMessage(), e);

//throw new NetworkErrorException("�q�接不成功，��h��查网�l�设�K?, e);

}

@SuppressLint("SdCardPath")

public static String download(String url) throws ServerErrorException, NetworkErrorException {

try {

//Log.i("http-download", url);

HttpPost request = new HttpPost(url);

HttpClient client = getHttpClient();

HttpResponse response = client.execute(request);

if (response.getStatusLine().getStatusCode() != HttpStatus.SC_OK) {

throw new ServerErrorException("�K��K��K��K��æ�K��K��K�Ժ��K��K��");

}

HttpEntity entity = response.getEntity();

InputStream is = entity.getContent();

if (is == null)

throw new ServerErrorException("stream is null ");

String fileExt = url.substring(url.lastIndexOf(".") + 1, url.length()).toLowerCase();

String fileName = url.substring(url.lastIndexOf("/") + 1, url.lastIndexOf("."));

File tempFile = new File("/sdcard/" + fileName + "." + fileExt);

if (!tempFile.exists())

tempFile.createNewFile();

FileOutputStream fileOutputStream = new FileOutputStream(tempFile);

byte[] buf = new byte[1024];

int ch;

while ((ch = is.read(buf)) != -1) {

fileOutputStream.write(buf, 0, ch);

}

fileOutputStream.flush();

fileOutputStream.close();

return tempFile.getAbsolutePath();

} catch (UnsupportedEncodingException e) {

logw(e.getMessage());

return null;

} catch (ClientProtocolException e) {

logw(e.getMessage());

return null;

} catch (IOException e) {

throw new NetworkErrorException(e.getMessage(), e);

}

/**

* 清空cookie

public static void clearCookie() {

if (customerHttpClient != null)

customerHttpClient.getCookieStore().clear();

}

/**

* 清除指定cookie

* @param name cookie名称

public static void clearCookie(String name) {

if (customerHttpClient == null)

return;

BasicClientCookie expiredCookie = new BasicClientCookie(name, "null");

expiredCookie.setExpiryDate(new Date(System.currentTimeMillis() - 1000));

customerHttpClient.getCookieStore().addCookie(expiredCookie);

}

Terry Zou 2015-07-13 22:10 发表评论

ffg

Terry Zou — Mon, 13 Jul 2015 03:04:00 GMT

http://yunpan.cn/ccdbTgQaYa4U7

Terry Zou 2015-07-13 11:04 发表评论

abe

Terry Zou — Wed, 08 Jul 2015 16:04:00 GMT

private Drawable img_time_filter,img_time_filter_selected ;

//�q��o器TextView中显�C�的囄��

img_time_filter = getResources().getDrawable(R.drawable.time_filter);

//调用setCompoundDrawables�Ӟ��必须调用Drawable.setBounds()�Ҏ��,否则囄��不显�C?/div>

img_time_filter.setBounds(0, 0, img_time_filter.getMinimumWidth(), img_time_filter.getMinimumHeight());

img_time_filter_selected = getResources().getDrawable(R.drawable.time_filter_selected);

img_time_filter_selected.setBounds(0, 0, img_time_filter_selected.getMinimumWidth(), img_time_filter_selected.getMinimumHeight());

tv_filterTime.setCompoundDrawables(img_time_filter_selected, null, null, null);

tv_filterTime.setTextColor(getResources().getColor(R.color.white));

rl_filterTime.setBackgroundColor(getResources().getColor(R.color.red));

tv_filterTime.setCompoundDrawables(img_time_filter, null, null, null);

rl_filterTime.setBackgroundColor(getResources().getColor(R.color.white));

lv_filterTime.setVisibility(View.INVISIBLE);

Terry Zou 2015-07-09 00:04 发表评论

Terry Zou — Wed, 24 Jun 2015 10:10:00 GMT

转蝲�Q?a >http://www.cnblogs.com/allenzheng/archive/2013/04/28/3050065.html
当应用运行�v来后��׃��开启一条线�E�，�U�程中会�q�行一个�Q务栈�Q�当Activity实例创徏后就会放入�Q务栈中�?/span>Activity启动模式的设�|�在AndroidManifest.xml文�g中，通过配置Activity的属�?/span>android:launchMode=""讄��?/span>

1. Standared模式�Q�默认）

我们�q�x��直接创徏�?span style="line-height: 1.5; font-family: 'Times New Roman'">Activity都是�q�种模式�?/span>Activity�Q�这�U�模式的Activity的特�Ҏ��Q�只要你创徏�?/span>Activity实例�Q�一旦激�z�该Activity�Q�则会向��d��栈中加入新创建的实例�Q�退�?/span>Activity则会在�Q务栈中销毁该实例�?/span>

2. SingleTop模式

�q�种模式会考虑当前要激�zȝ��Activity实例在�Q务栈中是否正处于栈顶�Q�如果处于栈��则无需重新创徏新的实例�Q�会重用已存在的实例�Q�否则会在�Q务栈中创建新的实例�?/span>

3. SingleTask模式

如果��d��栈中存在该模式的Activity实例�Q�则把栈中该实例以上�?/span>Activity实例全部�U�除�Q�调用该实例�?/span>newInstance()�Ҏ��重用�?/span>Activity�Q��该实例处於栈��位�|�，否则��重新创��Z��个新�?/span>Activity实例�?/span>

4. SingleInstance模式

当该模式Activity实例在�Q务栈中创建后�Q�只要该实例�q�在��d��栈中�Q�即只要�Ȁ�zȝ��是该�c�d��?/span>Activity�Q�都会通过调用实例�?/span>newInstance()�Ҏ��重用�?/span>Activity�Q�此时��用的都是同一�?/span>Activity实例�Q�它都会处于��d��栈的栈顶。此模式一般用于加载较慢的�Q�比较耗性能且不需要每�ơ都重新创徏�?/span>Activity�?/span>

Terry Zou 2015-06-24 18:10 发表评论

Terry Zou — Wed, 24 Jun 2015 09:28:00 GMT

摘要: android中跨�q�程通讯�?�U�方�? 转自�Q�http://www.cnblogs.com/sevenyuan/archive/2013/03/22/2975122.html�׃��android�pȝ��中应用程序之间不能共享内存。因此，在不同应用程序之间交互数据（跨进�E�通讯�Q�就�E�微�ȝ��一些。在android SDK中提供了4�U�用于跨�q�程通讯的方式。这4�U�方式正好对应于android�pȝ��?�U�应�?.. 阅读全文

Terry Zou 2015-06-24 17:28 发表评论

Android 一个应用中只有一个进�E�么�Q�还是可以有多个

Terry Zou — Wed, 24 Jun 2015 09:12:00 GMT

Android 手机上的应用一般情况下都在一个进�E�中�q�行�?/p>

但是�Q�也可以指定Activity或者Service在Remote �q�程中执行。多数情况下�Q�只有在用户认�ؓ应用退出后�q�需要��l�后台长期运行的应用�Q�才需要这样做。此�Ӟ��该应用有两个�q�程�?/p>

�q�有一�U�hack的方式，在apk中通过调用命��o行来启动另外的进�E�。此�U�方式用户不可见�Q�也不安全。不提倡�?/p>

Terry Zou 2015-06-24 17:12 发表评论