Android中网络框架的简单封装
前言
Android作为一款主要应用在移动终端的操作系统，访问网络是必不可少的功能。访问网络，最基本的接口有：HttpUrlConnection,HttpClient，而在后续的发展中，出现了Volley，OkHttp，Retrofit等网络封装库。由于各种原因，在实际的项目开发中，我们可能会需要在项目的版本迭代中，切换网络框架。如果对于网络框架没有好的封装，那么当需要切换网络框架时，可能就会有大量的迁移工作要做。
封装网络框架
在架构设计中，面向接口和抽象，是解耦的一个重要原则。本文将基于这一原则，实现一个简单的网络框架封装。
定义网络访问的接口
抽取出不同网络框架的共同方法，定义成接口方法。
public interface IHttpLoader {
/**
* GET方式请求
*
* @param url
* @param params
* @param callback
*/
void get(String url, Map<String, Object> params, IHttpCallback callback);
/**
* POST方式请求
*
* @param url
* @param params
* @param callback
*/
void post(String url, Map<String, Object> params, IHttpCallback callback);
}
定义网络访问的Callback
public interface IHttpCallback {
/**
* 成功时的回调
*
* @param result
*/
void onSuccess(String result);
/**
* 失败时的回调
*
* @param msg
*/
void onFailed(String msg);
}
定义具体的接口实现类
分别对具体的网络框架进行接口实现，这里以Volley和OkHttp为例
Volley的实现类
public class VolleyHttpLoader implements IHttpLoader {
private static RequestQueue mRequestQueue;
public VolleyHttpLoader(Context context) {
mRequestQueue = Volley.newRequestQueue(context);
}
@Override
public void get(String url, Map<String, Object> params, final IHttpCallback callback) {
StringRequest request = new StringRequest(Request.Method.GET, url,
new Response.Listener<String>() {
@Override
public void onResponse(String s) {
callback.onSuccess(s);
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError volleyError) {
callback.onFailed(volleyError.toString());
}
});
mRequestQueue.add(request);
}
@Override
public void post(String url, Map<String, Object> params, final IHttpCallback callback) {
StringRequest request = new StringRequest(Request.Method.POST, url,
new Response.Listener<String>() {
@Override
public void onResponse(String s) {
callback.onSuccess(s);
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError volleyError) {
callback.onFailed(volleyError.toString());
}
});
mRequestQueue.add(request);
}
}
OkHttp的实现类
public class OkHttpLoader implements IHttpLoader {
private static OkHttpClient mOkHttpClient;
public OkHttpLoader() {
mOkHttpClient = new OkHttpClient();
}
@Override
public void get(String url, Map<String, Object> params, final IHttpCallback callback) {
Request request = new Request.Builder().url(url).build();
mOkHttpClient.newCall(request).enqueue(new Callback() {
@Override
public void onFailure(@NotNull Call call, @NotNull IOException e) {
callback.onFailed(e.toString());
}
@Override
public void onResponse(@NotNull Call call, @NotNull Response response) throws IOException {
if (response.isSuccessful()) {
String result = response.body().string();
callback.onSuccess(result);
} else {
callback.onFailed(response.message());
}
}
});
}
@Override
public void post(String url, Map<String, Object> params, final IHttpCallback callback) {
RequestBody requestBody = appendBody(params);
Request request = new Request.Builder().post(requestBody).url(url).build();
mOkHttpClient.newCall(request).enqueue(new Callback() {
@Override
public void onFailure(@NotNull Call call, @NotNull IOException e) {
callback.onFailed(e.toString());
}
@Override
public void onResponse(@NotNull Call call, @NotNull Response response) throws IOException {
if (response.isSuccessful()) {
String result = response.body().string();
callback.onSuccess(result);
} else {
callback.onFailed(response.message());
}
}
});
}
private RequestBody appendBody(Map<String, Object> params) {
FormBody.Builder body = new FormBody.Builder();
if (params == null || params.isEmpty()) {
return body.build();
}
for (Map.Entry<String, Object> entry : params.entrySet()) {
body.add(entry.getKey(), entry.getValue().toString());
}
return body.build();
}
}
定义Callback的实现
public abstract class HttpCallback<Result> implements IHttpCallback {
@Override
public void onSuccess(String result) {
Gson gson = new Gson();
Class<?> clazz = analysisClazzInfo(this);
Result resultObj = (Result) gson.fromJson(result, clazz);
onSuccess(resultObj);
}
/**
* 成功时的回调
*
* @param result
*/
public abstract void onSuccess(Result result);
private Class<?> analysisClazzInfo(Object object) {
Type genType = object.getClass().getGenericSuperclass();
Type[] params = ((ParameterizedType) genType).getActualTypeArguments();
return (Class<?>) params[0];
}
}
返回的数据Bean
public class Data {
private int errorCode;
private String errorMsg;
private List<DataBean> data;
public int getErrorCode() {
return errorCode;
}
public void setErrorCode(int errorCode) {
this.errorCode = errorCode;
}
public String getErrorMsg() {
return errorMsg;
}
public void setErrorMsg(String errorMsg) {
this.errorMsg = errorMsg;
}
public List<DataBean> getData() {
return data;
}
public void setData(List<DataBean> data) {
this.data = data;
}
public static class DataBean {
private int courseId;
private int id;
private String name;
private int order;
private int parentChapterId;
private boolean userControlSetTop;
private int visible;
private List<?> children;
public int getCourseId() {
return courseId;
}
public void setCourseId(int courseId) {
this.courseId = courseId;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getOrder() {
return order;
}
public void setOrder(int order) {
this.order = order;
}
public int getParentChapterId() {
return parentChapterId;
}
public void setParentChapterId(int parentChapterId) {
this.parentChapterId = parentChapterId;
}
public boolean isUserControlSetTop() {
return userControlSetTop;
}
public void setUserControlSetTop(boolean userControlSetTop) {
this.userControlSetTop = userControlSetTop;
}
public int getVisible() {
return visible;
}
public void setVisible(int visible) {
this.visible = visible;
}
public List<?> getChildren() {
return children;
}
public void setChildren(List<?> children) {
this.children = children;
}
@Override
public String toString() {
return "DataBean{" +
"courseId=" + courseId +
", id=" + id +
", name='" + name + '\'' +
", order=" + order +
", parentChapterId=" + parentChapterId +
", userControlSetTop=" + userControlSetTop +
", visible=" + visible +
", children=" + children +
'}';
}
}
@Override
public String toString() {
return "Data{" +
"errorCode=" + errorCode +
", errorMsg='" + errorMsg + '\'' +
", data=" + data +
'}';
}
}
定义统一管理类
public class HttpHelper implements IHttpLoader {
private static IHttpLoader mHttpLoader;
private HttpHelper() {
}
public static void init(IHttpLoader httpLoader) {
mHttpLoader = httpLoader;
}
public static HttpHelper obtain() {
return HttpHelperHolder.INSTANCE;
}
static class HttpHelperHolder {
private static HttpHelper INSTANCE = new HttpHelper();
}
@Override
public void get(String url, Map<String, Object> params, IHttpCallback callback) {
mHttpLoader.get(url, params, callback);
}
@Override
public void post(String url, Map<String, Object> params, IHttpCallback callback) {
mHttpLoader.post(url, params, callback);
}
}
在Application中初始化
定义一个继承自Application的类，在onCreate方法中初始化网络访问
public class App extends Application {
@Override
public void onCreate() {
super.onCreate();
// HttpHelper.init(new OkHttpLoader());
HttpHelper.init(new VolleyHttpLoader(this));
}
}
后续如果需要切换网络框架，只需要在这里修改就可以了。
应用
public class MainActivity extends AppCompatActivity {
private static final String URL_HTTP = "https://www.wanandroid.com/wxarticle/chapters/json";
private ImageView mIv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTv = findViewById(R.id.tv);
findViewById(R.id.btn_get).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
HttpHelper.obtain().get(URL_HTTP, null, new HttpCallback<Data>() {
@Override
public void onFailed(final String msg) {
runOnUiThread(new Runnable() {
@Override
public void run() {
mTv.setText(msg);
}
});
}
@Override
public void onSuccess(final Data data) {
runOnUiThread(new Runnable() {
@Override
public void run() {
mTv.setText(data.toString());
}
});
}
});
}
});
}
}
结束
这里介绍的，其实只是一个封装的思路。基于这个思路，还可以封装常用的图片访问库等。可以自由拓展。
源码地址：https://github.com/milovetingting/Samples/tree/master/Loader
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