Android10--Android之动态接口实现加载网页和图片

承接上文:

今天我们使用动态接口去实现,更好的实现了封装性,通过接口,我们可以拿到NetWorkAsyncTask的一个类.

1.首先我们要有 一个注解,这个注解可以拿到我们的url..

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

2.然后我们要有一个接口,通过这个接口我们我可拿到我们想要的东西.

之后我们如果需要拿到不同的实体类,我们只需要重写一个接口传入不同的url即可.

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

然后实现我们的动态接口

public class Tools {
public static<T> T getInstance(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 {
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)) {
ParameterizedType type = (ParameterizedType) method.getGenericReturnType();
Type entryType = type.getActualTypeArguments()[0];
return new NetworkTask<>(url, (Class) entryType);
}
}
return null;
}
}
}

测试类:

public class MainActivity extends AppCompatActivity implements NetworkTask.Callback<ShowEntry> {

private WebView web;
private ImageView image;
private static final String CSS = "<style>img{max-width:100%}</style>";

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
web = (WebView) findViewById(R.id.main2_web);
image = (ImageView) findViewById(R.id.main2_image);
TopServer server = Tools.getInstance(TopServer.class);
NetworkTask<ShowEntry> show = server.getShow(3);
show.execute(this);
}

@Override
public void onSuccess(ShowEntry entry) {
setTitle(entry.getTitle());
new ImageLoader(image).execute("http://tnfs.tngou.net/img" + entry.getImg());
web.loadDataWithBaseURL("http://www.tngou.net", CSS + entry.getMessage(), "text/html; charset=utf-8", "UTF-8", null);
}

@Override
public void onFail(Exception e) {
e.printStackTrace();
Toast.makeText(MainActivity.this, "网络错误", Toast.LENGTH_SHORT).show();
}
}

之后的使用.我们可以将加载图片,网页内容,和动态接口,注解,这几个类放到一起,之后当做一个Moudle直接道途使用即可..

结果实现:

和上篇的效果一样…