XUtils3--代码详解(一)

XUtil3详解二---http

官方readme.me

  • xUtils 包含了很多实用的android工具.
  • xUtils 支持超大文件(超过2G)上传,更全面的http请求协议支持(11种谓词),拥有更加灵活的ORM,更多的事件注解支持且不受混淆影响...
  • xUtils 最低兼容Android 4.0 (api level 14). (Android 2.3?)
  • xUtils3变化较多所以建立了新的项目不在旧版(github.com/wyouflf/xUtils)上继续维护, 相对于旧版本:
    -- HTTP实现替换HttpClient为UrlConnection, 自动解析回调泛型, 更安全的断点续传策略.-- 支持标准的Cookie策略, 区分domain, path...
    -- 事件注解去除不常用的功能, 提高性能.-- 数据库api简化提高性能, 达到和greenDao一致的性能.
    -- 图片绑定支持gif, webp; 支持圆角, 圆形, 方形等裁剪, 支持自动旋转...需要权限:


初始化:

// 在application的onCreate中初始化
@Override
public void onCreate() {
   super.onCreate();
   x.Ext.init(this);
   x.Ext.setDebug(true); // 是否输出debug日志...
}

访问网络

/** * 自定义实体参数类请参考:
* 请求注解 {@link org.xutils.http.annotation.HttpRequest} 
* 请求注解处理模板接口 {@link org.xutils.http.app.ParamsBuilder} 
* * 需要自定义类型作为callback的泛型时, 参考:
* 响应注解 {@link org.xutils.http.annotation.HttpResponse}
* 响应注解处理模板接口 {@link org.xutils.http.app.ResponseParser} 
* * 示例: 查看 org.xutils.sample.http 包里的代码 
*/
BaiduParams params =newBaiduParams();params.wd ="xUtils";// 有上传文件时使用multipart表单, 否则上传原始文件流.
// params.setMultipart(true);
// 上传文件方式 1
// params.uploadFile = new File("/sdcard/test.txt");// 上传文件方式 2// params.addBodyParameter("uploadFile", new File("/sdcard/test.txt"));Callback.Cancelable cancelable = x.http().get(params,
/** * 1. callback的泛型: 
* callback参数默认支持的泛型类型参见{@link org.xutils.http.loader.LoaderFactory}, 
* 例如: 指定泛型为File则可实现文件下载, 使用params.setSaveFilePath(path)指定文件保存的全路径. 
* 默认支持断点续传(采用了文件锁和尾端校验续传文件的一致性). 
* 其他常用类型可以自己在LoaderFactory中注册, 
* 也可以使用{@link org.xutils.http.annotation.HttpResponse} 
* 将注解HttpResponse加到自定义返回值类型上, 实现自定义ResponseParser接口来统一转换. 
* 如果返回值是json形式, 那么利用第三方的json工具将十分容易定义自己的ResponseParser. 
* 如示例代码{@link org.xutils.sample.http.BaiduResponse}, 可直接使用BaiduResponse作为 
* callback的泛型. 
* * 2. callback的组合: 
* 可以用基类或接口组合个种类的Callback, 见{@link org.xutils.common.Callback}. 
* 例如: 
* a. 组合使用CacheCallback将使请求检测缓存或将结果存入缓存(仅GET请求生效). 
* b. 组合使用PrepareCallback的prepare方法将为callback提供一次后台执行耗时任务的机会, * 然后将结果给onCache或onSuccess. 
* c. 组合使用ProgressCallback将提供进度回调. 
* ...(可参考{@link org.xutils.image.ImageLoader} 
* 或 示例代码中的 {@link org.xutils.sample.download.DownloadCallback}) * * 3. 请求过程拦截或记录日志: 参考 {@link org.xutils.http.app.RequestTracker} 
* * 4. 请求Header获取: 参考 {@link org.xutils.http.app.RequestInterceptListener} 
* * 5. 其他(线程池, 超时, 重定向, 重试, 代理等): 参考 {@link org.xutils.http.RequestParams} 
* **/
newCallback.CommonCallback() { 
  @Override
  public void onSuccess(Stringresult) { 
    Toast.makeText(x.app(), result, Toast.LENGTH_LONG).show();
   } 
  @Override
  public void onError(Throwableex, booleanisOnCallback) { 
    //Toast.makeText(x.app(), ex.getMessage(),Toast.LENGTH_LONG).show();
    if (ex instanceofHttpException) { // 网络错误HttpException
       httpEx = (HttpException) ex;
       int responseCode = httpEx.getCode();
       String responseMsg = httpEx.getMessage();
       String errorResult = httpEx.getResult();
      // ... 
    } else {
       // 其他错误
      //   ... 
  } 
  Toast.makeText(x.app(), ex.getMessage(), Toast.LENGTH_LONG).show();
} 
  @Override
  public void onCancelled(CancelledExceptioncex) {
     Toast.makeText(x.app(), "cancelled", Toast.LENGTH_LONG).show(); 
  } 
  @Override 
  public void onFinished() { } }); 
// cancelable.cancel();  
// 取消请求

简单版本

RequestParams params =newRequestParams("https://www.baidu.com/s"); 

params.setSslSocketFactory(...); // 设置ssl 
params.addQueryStringParameter("wd", "xUtils"); 
x.http().get(params, newCallback.CommonCallback() { 
  @Override
  public void onSuccess(Stringresult) {
     Toast.makeText(x.app(), result, Toast.LENGTH_LONG).show(); 
  } 
  @Override
  public void onError(Throwableex, booleanisOnCallback) { 
      Toast.makeText(x.app(), ex.getMessage(), T  oast.LENGTH_LONG).show(); 
  } 
  @Override
  public void onCancelled(CancelledExceptioncex) {  
      Toast.makeText(x.app(), "cancelled", Toast.LENGTH_LONG).show(); 
  }
   @Override
  public void onFinished() { } });

带有缓存的请求示例:

BaiduParams params =newBaiduParams();
params.wd ="xUtils";// 默认缓存存活时间, 单位:毫秒.(如果服务没有返回有效的max-age或Expires)params.setCacheMaxAge(1000*60);
Callback.Cancelable cancelable // 使用CacheCallback, xUtils将为该请求缓存数据.
      = x.http().get(params, newCallback.CacheCallback() { 
      private boolean hasError =false; 
      privateString result =null; 
      @Override
      public boolean onCache(Stringresult) { // 得到缓存数据, 缓存过期后不会进入这个方法.
      // 如果服务端没有返回过期时间, 参考params.setCacheMaxAge(maxAge)方法.//
      // * 客户端会根据服务端返回的 header 中 max-age 或 expires 来确定本地缓存是否给 onCache 方法.
      // 如果服务端没有返回 max-age 或 expires, 那么缓存将一直保存, 除非这里自己定义了返回false的// 逻辑, 那么xUtils将请求新数据, 来覆盖它.//
      // * 如果信任该缓存返回 true, 将不再请求网络;
      // 返回 false 继续请求网络, 但会在请求头中加上ETag, Last-Modified等信息,
      // 如果服务端返回304, 则表示数据没有更新, 不继续加载数据.
      //this.result = result; return false; 
      // true: 信任缓存数据, 不在发起网络请求; false不信任缓存数据. 
      } 
      @Override
      public void onSuccess(Stringresult) { // 注意: 如果服务返回304或 onCache 选择了信任缓存, 这里将不会被调用,
      // 但是 onFinished 总会被调用.
      this.result = result; 
      }
     @Override
      public void onError(Throwableex, booleanisOnCallback) { 
          hasError =true;
         Toast.makeText(x.app(), ex.getMessage(),   Toast.LENGTH_LONG).show(); 

        if (ex instanceofHttpException) { 
        // 网络错误
        HttpException httpEx = (HttpException) ex;
        int responseCode = httpEx.getCode(); 
        String responseMsg = httpEx.getMessage();
         String errorResult = httpEx.getResult(); 
          // ... 
        } else { 
        // 其他错误// ... 
        }
       } 
        @Override
      public void onCancelled(CancelledExceptioncex) { 
        Toast.makeText(x.app(), "cancelled", Toast.LENGTH_LONG).show();
      }
       @Override
      public void onFinished() { 
        if (!hasError && result !=null) { // 成功获取数据
        Toast.makeText(x.app(), result, Toast.LENGTH_LONG).show();
         }
       }
    });

绑定图片


x.image().bind(imageView, url, imageOptions);

// assets file
x.image().bind(imageView, "assets://test.gif", imageOptions);

// local file
x.image().bind(imageView, newFile("/sdcard/test.gif").toURI().toString(), imageOptions);
x.image().bind(imageView, "/sdcard/test.gif", imageOptions);
x.image().bind(imageView, "file:///sdcard/test.gif", imageOptions);
x.image().bind(imageView, "file:/sdcard/test.gif", imageOptions);
x.image().bind(imageView, url, imageOptions, newCallback.CommonCallback() {...});
x.image().loadDrawable(url, imageOptions, newCallback.CommonCallback() {...});
x.image().loadFile(url, imageOptions, newCallback.CommonCallback() {...});

查看源码:


主要类x.class

这个类为任务控制中心, http, image, db, view注入等接口的入口. 需要在在application的onCreate中初始化: x.Ext.init(this);

作者把所有的入口全放到x.class 类中。内部静态类 Ext来管理和创建几个manager对象(httpManager ImageManager 等 全为接口)我查了词典。Ext 翻译过来有 提取 扩展 外部的意思。

** * Created by wyouflf on 15/6/10. 
* 任务控制中心, http, image, db, view注入等接口的入口. 
* 需要在在application的onCreate中初始化: x.Ext.init(this); 
*/
public final class x {
 ...
public static TaskController task() {
      return Ext.taskController;
}
public static HttpManager http() {...}
public static ImageManager image() {...}
public static ViewInjector view(){...}
public static DbManager getDb(DbManager.DaoConfig daoConfig){...}
public static class Ext {
private static boolean debug; 
private static Application app; 
private static TaskController taskController;
private static HttpManager httpManager;
private static ImageManager imageManager; 
private static ViewInjector viewInjector;
private Ext() { }
  static { 
TaskControllerImpl.registerInstance();
// 默认信任所有https域名
HttpsURLConnection.setDefaultHostnameVerifier(new HostnameVerifier() {
@Override
public boolean verify(String hostname, SSLSession session) {return true;} 
});
}
public static void init(Application app) {
      if (Ext.app == null) {
          Ext.app = app;
      }
} 
... }
private static class MockApplication extends Application {
public MockApplication(Context baseContext) {
      this.attachBaseContext(baseContext);
      }
    }
}


在x.class中 ,除去几个应用的方法。我发现了TaskController 这个对象。从字面上理解应该是task控制类。我们发现TaskController 是一个接口。并且和他的实现类在common包下面,所有task相关的应该xutils3中通用的一个模块或者实现方式

XUtils3--代码详解(一)_第1张图片
common包下面的一些类和接口

查看TaskController和TaskControllerImpl发现 这是task管理的一个控制类。
**TaskController.class **

/** * 
Created by wyouflf on 15/6/11. 
* 任务管理接口
*/
public interface TaskController {
/** 
* 在UI线程执行runnable. 
* 如果已在UI线程, 则直接执行. 
* * @param runnable
*/
void autoPost(Runnable runnable);
/** 
* 在UI线程执行runnable. 
* post到msg queue. 
* * @param runnable
*/
void post(Runnable runnable);
/** 
* 在UI线程执行runnable. 
* * @param runnable
* @param delayMillis 延迟时间(单位毫秒) 
*/
void postDelayed(Runnable runnable, long delayMillis);
/** 
* 在后台线程执行runnable 
* * @param runnable
*/
void run(Runnable runnable);
/** 
* 移除未执行的runnable 
* * @param runnable
*/
void removeCallbacks(Runnable runnable);
/** 
* 开始一个异步任务
* * @param task
* @param 
* @return*/
 AbsTask start(AbsTask task);
/** * 同步执行一个任务
* * @param task
* @param 
* @return
* @throws Throwable 
*/
 T startSync(AbsTask task) throws Throwable;
/** 
* 批量执行异步任务
* * @param groupCallback
* @param tasks* @param 
* @return
*/
> Callback.Cancelable startTasks(Callback.GroupCallback groupCallback, T... tasks);
}

TaskControllerImpl.class 在实现类中我们发现。它的作用应该是1.回调函数发回主线程。2.目标task的dobackground方法执行


@Override
public void autoPost(Runnable runnable) {
if (runnable == null) return; 
if (Thread.currentThread() == Looper.getMainLooper().getThread()) { 
    runnable.run();
} else { 
TaskProxy.sHandler.post(runnable);
}
}
/** 
* run task 
* * @param task
* @param 
* @return
*/
@Override
public  AbsTask start(AbsTask task) { 
TaskProxy proxy = null;
 if (task instanceof TaskProxy) {
      proxy = (TaskProxy) task;
} else { 
      proxy = new TaskProxy(task);
}
try {
 proxy.doBackground();
} catch (Throwable ex) {
LogUtil.e(ex.getMessage(), ex);
}
return proxy;
}

@SuppressWarnings("unchecked")
@Override 
    public > Callback.Cancelable startTasks( final Callback.GroupCallback groupCallback, final T... tasks) {
       if (tasks == null) { 
          throw new IllegalArgumentException("task must not be null"); 
        } 
        final Runnable callIfOnAllFinished = new Runnable() { 
          private final int total = tasks.length; 
          private final AtomicInteger count = new AtomicInteger(0);
         @Override 
         public void run() {
           if (count.incrementAndGet() == total) {
             if (groupCallback != null) {
             groupCallback.onAllFinished();
             }
           }
         }
     }; 

     for (final T task : tasks) {
           start(new TaskProxy(task) {
             @Override 
              protected void onSuccess(Object result) { 
                super.onSuccess(result);
                 post(new Runnable() {
                   @Override 
                    public void run() { 
                    if (groupCallback != null) {
                     groupCallback.onSuccess(task); 
                     }
                   }
                  }); 
                } 
            @Override
             protected void onCancelled(final Callback.CancelledException cex) { 
                      super.onCancelled(cex);
                      post(new Runnable() { 
                          @Override
                          public void run() {
                                if (groupCallback != null) {
                                       groupCallback.onCancelled(task, cex);
                                 }
                           }
                       }); 
                  } 
             @Override 
              protected void onError(final Throwable ex, final boolean isCallbackError) { 
                    super.onError(ex, isCallbackError);
                    post(new Runnable() {
                         @Override
                         public void run() {
                         if (groupCallback != null) {
                         groupCallback.onError(task, ex, isCallbackError); 
                          } 
                      } 
                    });
               } 
             @Override
             protected void onFinished() {
             super.onFinished(); 
             post(new Runnable() { 
                  @Override 
                  public void run() {
                         if (groupCallback != null) { 
                                groupCallback.onFinished(task);
                         } 
                        callIfOnAllFinished.run(); 
                  } 
              });
       } 
    });
 } 
return new Callback.Cancelable() { 
      @Override
       public void cancel() {
            for (T task : tasks) {
                task.cancel(); 
            } 
      } 
      @Override 
      public boolean isCancelled() { 
          boolean isCancelled = true;
           for (T task : tasks) { 
                if (!task.isCancelled()){ 
                isCancelled = false; 
                } 
            }
         return isCancelled;
     } 
    }; 
}

Task相关

在TaskControllerImpl中出现了俩个类AysTask.class 和TaskProxy.class

  • AysTask 异步任务基类
    AysTask是异步任务的基类并且是个抽象类。实现了callback的取消接口 继承AysTask 必须要复写三个方法doBackground,onSuccess,onError
/** 
* Created by wyouflf on 15/6/5. 
* 异步任务基类 
* * @param  
*/
public abstract class AbsTask implements Callback.Cancelable {
 private TaskProxy taskProxy = null;
 private final Callback.Cancelable cancelHandler;
 private volatile boolean isCancelled = false;
 private volatile State state = State.IDLE;
 private ResultType result;
  ... 
 protected abstract ResultType doBackground() throws Throwable;
 protected abstract void onSuccess(ResultType result);
 protected abstract void onError(Throwable ex, boolean isCallbackError);
 ...
 @Override
//通用的异步加载的cancel方法
 public final synchronized void cancel() {
 if (!this.isCancelled) {
 this.isCancelled = true;
 cancelWorks();
 if (cancelHandler != null && !cancelHandler.isCancelled()) { 
    cancelHandler.cancel(); 
  }
 if (this.state == State.WAITING || (this.state == State.STARTED && isCancelFast())) {
   if (taskProxy != null) {
   taskProxy.onCancelled(new Callback.CancelledException("cancelled by user"));
   taskProxy.onFinished();
   } else if (this instanceof TaskProxy) {
    this.onCancelled(new Callback.CancelledException("cancelled by user")); 
    this.onFinished();
     }
  } 
 } 
 }
 @Override
 public final boolean isCancelled() {
 return isCancelled || state == State.CANCELLED || (cancelHandler != null && cancelHandler.isCancelled());
 }
 public enum State {//线程的几个状态 大学里应该学过
 IDLE(0), WAITING(1), STARTED(2), SUCCESS(3), CANCELLED(4), ERROR(5);
 private final int value;
 private State(int value) { this.value = value; }
 public int value() { return value; } }}

注释:
volatile:就像大家更熟悉的const一样,volatile是一个类型修饰符(type specifier)。它是被设计用来修饰被不同线程访问和修改的变量。如果不加入volatile,基本上会导致这样的结果:要么无法编写多线程程序,要么编译器失去大量优化的机会。(ps:写这篇博客之前根本不知道这个东西)

  • TaskProxy
    Taskproxy 异步任务的代理类。这里面有两个重要的成员变量handle 和PriorityExecutor 。
    在代码
    private InternalHandler() {
    super(Looper.getMainLooper());
    }
    看到 handle 是依靠MainThread 创建的。
    所有最后发送出去的message都会被 Mainthread接受。PriorityExecutor 为线程池。
    这里不多讲了。

/** * 异步任务的代理类(仅在task包内可用) 
* * @param  
*/
/*package*/ class TaskProxy extends AbsTask { 
/*package*/ static final InternalHandler sHandler = new InternalHandler(); 
/*package*/ static final PriorityExecutor sDefaultExecutor = new PriorityExecutor(true);
 private final AbsTask task;
 private final Executor executor;
 private volatile boolean callOnCanceled = false;
 private volatile boolean callOnFinished = false;
 /*package*/ TaskProxy(AbsTask task) {
         super(task);
         this.task = task;  
         this.task.setTaskProxy(this);
         this.setTaskProxy(null);
         Executor taskExecutor = task.getExecutor();
         if (taskExecutor == null) {
             taskExecutor = sDefaultExecutor;
         }
         this.executor = taskExecutor;
     }
     @Override 
      protected final ResultType doBackground() throws Throwable {
           this.onWaiting();
           PriorityRunnable runnable = new PriorityRunnable(
           task.getPriority(),
           new Runnable() {
             @Override public void run() {
               try { // 等待过程中取消 
                    if (callOnCanceled || TaskProxy.this.isCancelled()) {
                              throw new Callback.CancelledException("");
                     }
               // start running 
              TaskProxy.this.onStarted();
             if (TaskProxy.this.isCancelled()) {
             // 开始时取消 
                throw new Callback.CancelledException(""); 
              }
           // 执行task, 得到结果.
           task.setResult(task.doBackground()); 
          TaskProxy.this.setResult(task.getResult()); 
          // 未在doBackground过程中取消成功
         if (TaskProxy.this.isCancelled()) { 
                throw new Callback.CancelledException("");
           }
           // 执行成功 
        TaskProxy.this.onSuccess(task.getResult());
       } catch (Callback.CancelledException cex) {
             TaskProxy.this.onCancelled(cex);
       } catch (Throwable ex) {
             TaskProxy.this.onError(ex, false);
       } finally {
             TaskProxy.this.onFinished();
       }
   }
 });
 this.executor.execute(runnable);
 return null;
 }
 @Override
 protected void onSuccess(ResultType result) {
     this.setState(State.SUCCESS);
       sHandler.obtainMessage(MSG_WHAT_ON_SUCCESS, this).sendToTarget();
     }
 @Override
 /*package*/ final void setState(State state) { super.setState(state); this.task.setState(state); }
 // ########################### inner type #############################
 private static class ArgsObj {
     final TaskProxy taskProxy;
 final Object[] args;
 public ArgsObj(TaskProxy taskProxy, Object... args) {
     this.taskProxy = taskProxy;
     this.args = args;
   }
 }
 private final static int MSG_WHAT_BASE = 1000000000;
 private final static int MSG_WHAT_ON_WAITING = MSG_WHAT_BASE + 1;
 private final static int MSG_WHAT_ON_START = MSG_WHAT_BASE + 2; private final static int MSG_WHAT_ON_SUCCESS = MSG_WHAT_BASE + 3;
 private final static int MSG_WHAT_ON_ERROR = MSG_WHAT_BASE + 4; 
private final static int MSG_WHAT_ON_UPDATE = MSG_WHAT_BASE + 5; 
private final static int MSG_WHAT_ON_CANCEL = MSG_WHAT_BASE + 6;
 private final static int MSG_WHAT_ON_FINISHED = MSG_WHAT_BASE + 7;
 /*package*/ final static class InternalHandler extends Handler {
 private InternalHandler() { super(Looper.getMainLooper()); } 
@Override 
@SuppressWarnings("unchecked")
 public void handleMessage(Message msg) {
 if (msg.obj == null) {
 throw new IllegalArgumentException("msg must not be null"); 
} .......  
}}


现在主要看 handle的处理方法handleMessage:
在方法中
会得到一个TaskProxy代理对象.
TaskProxy.task为构建对象时候传递进来的一个AbsTask实现类。
该实现类里面会实现一些 成功或失败的方法。 然后 handle会通过what来区别和调用onSuccess ,onError

@Override 
@SuppressWarnings("unchecked")
 public void handleMessage(Message msg) {
 if (msg.obj == null) {
 throw new IllegalArgumentException("msg must not be null");
 } 
TaskProxy taskProxy = null;
 Object[] args = null; 
if (msg.obj instanceof TaskProxy) { 
taskProxy = (TaskProxy) msg.obj;
 } else if (msg.obj instanceof ArgsObj) { 
ArgsObj argsObj = (ArgsObj) msg.obj;
 taskProxy = argsObj.taskProxy; 
args = argsObj.args;
 } if (taskProxy == null) { 
throw new RuntimeException("msg.obj not instanceof TaskProxy"); 
}
 try {
 switch (msg.what) {
 case MSG_WHAT_ON_WAITING: {
 taskProxy.task.onWaiting();
 break; 
} 
case MSG_WHAT_ON_START: {
 taskProxy.task.onStarted();
 break; 
} 
case MSG_WHAT_ON_SUCCESS: { 
taskProxy.task.onSuccess(taskProxy.getResult());
 break;
 } 
case MSG_WHAT_ON_ERROR: { 
assert args != null;
 Throwable throwable = (Throwable) args[0]; 
LogUtil.d(throwable.getMessage(), throwable); 
taskProxy.task.onError(throwable, false);
 break;
 } 
case MSG_WHAT_ON_UPDATE: {
 taskProxy.task.onUpdate(msg.arg1, args);
 break; 
}
 case MSG_WHAT_ON_CANCEL: {
 if (taskProxy.callOnCanceled) return; 
taskProxy.callOnCanceled = true; 
assert args != null; 
taskProxy.task.onCancelled((org.xutils.common.Callback.CancelledException) args[0]); break;
 } 
case MSG_WHAT_ON_FINISHED: {
 if (taskProxy.callOnFinished) return;
 taskProxy.callOnFinished = true;
 taskProxy.task.onFinished();
 break; 
} 
default: {
 break; 
} 
} 
} catch (Throwable ex) { 
taskProxy.setState(State.ERROR);

 if (msg.what != MSG_WHAT_ON_ERROR) { 
taskProxy.task.onError(ex, true); 
} else if (x.isDebug()) { 
throw new RuntimeException(ex);
 }
 } }

xutils3.Http待续

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