异步任务-AsyncTack进阶-结合动态接口

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使用动态接口实现异步任务下载

1, 这里我们使用到了上一篇博客中的NetWorkTask工具类, 这里不再赘述, 链接如下

github
CSDN

2, 需要我们写一个注解, 用于标示接口需要传入的数据

@Target(ElementType.METHOD)@Retention(RetentionPolicy.RUNTIME)public @interface UrlString {    String value();}

3, 写一个工具类Tools, 生成接口的实例

/** * Created by Lulu on 2016/8/31. */public class Tools {    public static <T> T getInsances(Class<T> type) {        Object o = Proxy.newProxyInstance(type.getClassLoader(), new Class[]{type}, new MyHandler());        return (T) o;    }    private static class MyHandler implements InvocationHandler {        @Override        public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {            method.setAccessible(true);            //得到方法的注解            UrlString annotation = method.getAnnotation(UrlString.class);            if (annotation != null) {                String url = String.format(Locale.CHINA, annotation.value(), args);                Class<?> returnType = method.getReturnType();                if (returnType.equals(NetWorkTask.class)) {                    //得到泛型                    ParameterizedType type = (ParameterizedType) method.getGenericReturnType();                    //得到实体类的类型                    Type entryType = type.getActualTypeArguments()[0];                    return new NetWorkTask<>(url, (Class<Object>) entryType);                }            }            return null;        }    }}

4, 测试使用:

1) 新建一个获取数据的接口

public interface TopServer {    @UrlString("http://www.tngou.net/api/top/show?id=%d")    NetWorkTask<ShowEntry> getShow(int id);}

2)创建Activity测试

public class Main4Activity extends AppCompatActivity implements NetWorkTask.Callback<ShowEntry>{    private TextView text;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main4);        TopServer server = Tools.getInsances(TopServer.class);        server.getShow(13122).execute(this);        text = (TextView) findViewById(R.id.main4_text);    }    @Override    public void onSuccess(ShowEntry t) {        text.setText(t.getMessage());    }    @Override    public void onFailed(Exception e) {    }}

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