前言
RxJava2、Retrofit2火了有一段时间了，前段时间给公司的项目引入了这方面相关的技术，在此记录一下相关封装的思路。
需求
封装之前要先明白需要满足哪些项目需求。
- RxJava2衔接Retrofit2
- Retrofit2网络框架异常的统一处理
- 兼容fastjson（可选）
- RxJava2内存泄漏的处理
- 异步请求加入Loading Dialog
1.依赖
implementation 'io.reactivex.rxjava2:rxandroid:2.0.1'
implementation 'io.reactivex.rxjava2:rxjava:2.1.3'
implementation 'com.squareup.retrofit2:retrofit:2.3.0'
implementation 'com.squareup.retrofit2:adapter-rxjava2:2.3.0'
implementation 'com.squareup.okhttp3:okhttp:3.9.0'
implementation 'com.trello.rxlifecycle2:rxlifecycle-components:2.2.0'
implementation 'com.alibaba:fastjson:1.1.59.android'//可选其它框架比如Gson
2.RxJava2衔接Retrofit2
先封装一个网络框架的管理类，方便调用
public class RxHttp {
private final String BASE_URL = "https://github.com/";
private Map<String, Retrofit> mRetrofitMap = new HashMap<>();
private RxHttp() {
}
/**
* 单例模式
* @return
*/
public static RxHttp getInstance() {
return RxHttpHolder.sInstance;
}
private static class RxHttpHolder{
private final static RxHttp sInstance = new RxHttp();
}
public Retrofit getRetrofit(String serverUrl) {
Retrofit retrofit;
if (mRetrofitMap.containsKey(serverUrl)) {
retrofit = mRetrofitMap.get(serverUrl);
} else {
retrofit = createRetrofit(serverUrl);
mRetrofitMap.put(serverUrl, retrofit);
}
return retrofit;
}
public SyncServerService getSyncServer(){
return getRetrofit(BASE_URL).create(SyncServerService.class);
}
/**
*
* @param baseUrl baseUrl要以/作为结尾 eg：https://github.com/
* @return
*/
private Retrofit createRetrofit(String baseUrl) {
OkHttpClient client = new OkHttpClient().newBuilder()
.readTimeout(30, TimeUnit.SECONDS)
.connectTimeout(30, TimeUnit.SECONDS)
.retryOnConnectionFailure(true)
.build();
return new Retrofit.Builder()
.baseUrl(baseUrl)
.addConverterFactory(FastJsonConverterFactory.create())
.addCallAdapterFactory(RxJava2CallAdapterFactory.create())
.client(client)
.build();
}
}
3.Restful风格接口
public interface SyncServerService {
@GET("service/mobile/IsLatestVersion.ashx")
Observable<Response<String>> getLatestVersion(@Query("SoftwareID") String SoftwareID,
@Query("ClientVersion") String ClientVersion);
}
服务端返回的基本类型，在导入类的时候特别需要注意区分该Response类型
public class Response<T> {
public int ret;//约定 -1为server返回数据异常 200为正常范围
public String msg;
public T data;
public int getRet() {
return ret;
}
public void setRet(int ret) {
this.ret = ret;
}
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
public T getData() {
return data;
}
public void setData(T data) {
this.data = data;
}
}
4.fastjson的支持
由于项目中采用了fastjson，square的开源项目尚未实现对fastjson的支持，但是保留了代码的扩展，这边可以自己封装一下fastjson的转换器。
public class FastJsonConverterFactory extends Converter.Factory {
private final SerializeConfig mSerializeConfig;
private FastJsonConverterFactory(SerializeConfig serializeConfig) {
this.mSerializeConfig = serializeConfig;
}
public static FastJsonConverterFactory create() {
return create(SerializeConfig.getGlobalInstance());
}
public static FastJsonConverterFactory create(SerializeConfig serializeConfig) {
return new FastJsonConverterFactory(serializeConfig);
}
@Override
public Converter<?, RequestBody> requestBodyConverter(Type type, Annotation[] parameterAnnotations, Annotation[] methodAnnotations, Retrofit retrofit) {
return new FastJsonRequestBodyConverter<>(mSerializeConfig);
}
@Override
public Converter<ResponseBody, ?> responseBodyConverter(Type type, Annotation[] annotations, Retrofit retrofit) {
return new FastJsonResponseBodyConvert<>(type);
}
}
final class FastJsonRequestBodyConverter<T> implements Converter<T, RequestBody> {
private final MediaType MEDIA_TYPE = MediaType.parse("application/json; charset=UTF-8");
private SerializeConfig mSerializeConfig;
public FastJsonRequestBodyConverter(SerializeConfig serializeConfig) {
this.mSerializeConfig = serializeConfig;
}
@Override
public RequestBody convert(T value) throws IOException {
return RequestBody.create(MEDIA_TYPE, JSON.toJSONBytes(value, mSerializeConfig));
}
}
final class FastJsonResponseBodyConvert<T> implements Converter<ResponseBody, T> {
private Type mType;
public FastJsonResponseBodyConvert(Type type) {
this.mType = type;
}
@Override
public T convert(ResponseBody value) throws IOException {
return JSON.parseObject(value.string(), mType);
}
}
5.数据返回统一处理
public abstract class BaseObserver<T> implements Observer<Response<T>> {
@Override
public final void onNext(@NonNull Response<T> result) {
if (result.getRet() == -1) {
onFailure(new Exception(result.getMsg()), result.getMsg());//该异常可以汇报服务端
} else {
onSuccess(result.getData());
}
}
@Override
public void onError(@NonNull Throwable e) {
onFailure(e, RxExceptionUtil.exceptionHandler(e));
}
@Override
public void onComplete() {
}
@Override
public void onSubscribe(@NonNull Disposable d) {
}
public abstract void onSuccess(T result);
public abstract void onFailure(Throwable e, String errorMsg);
}
下面加入了异常处理类
public class RxExceptionUtil {
public static String exceptionHandler(Throwable e){
String errorMsg = "未知错误";
if (e instanceof UnknownHostException) {
errorMsg = "网络不可用";
} else if (e instanceof SocketTimeoutException) {
errorMsg = "请求网络超时";
} else if (e instanceof HttpException) {
HttpException httpException = (HttpException) e;
errorMsg = convertStatusCode(httpException);
} else if (e instanceof ParseException || e instanceof JSONException
|| e instanceof com.alibaba.fastjson.JSONException) {
errorMsg = "数据解析错误";
}
return errorMsg;
}
private static String convertStatusCode(HttpException httpException) {
String msg;
if (httpException.code() >= 500 && httpException.code() < 600) {
msg = "服务器处理请求出错";
} else if (httpException.code() >= 400 && httpException.code() < 500) {
msg = "服务器无法处理请求";
} else if (httpException.code() >= 300 && httpException.code() < 400) {
msg = "请求被重定向到其他页面";
} else {
msg = httpException.message();
}
return msg;
}
}
6.异步请求加入Loading Dialog
这个时候我们可以根据自己项目中统一封装的dialog自行扩展BaseObserver
public abstract class ProgressObserver<T> extends BaseObserver<T>{
private MaterialDialog mMaterialDialog;
private Context mContext;
private String mLoadingText;
public ProgressObserver(Context context){
this(context, null);
}
public ProgressObserver(Context context, String loadingText){
mContext = context;
mLoadingText = loadingText;
}
@Override
public void onSubscribe(@NonNull Disposable d) {
if (!d.isDisposed()) {
mMaterialDialog = new MaterialDialog.Builder(mContext).content(mLoadingText == null ? "正在加载中..."
: mLoadingText).isProgress(true).build();
mMaterialDialog.show();
}
}
@Override
public void onComplete() {
if (mMaterialDialog != null) {
mMaterialDialog.dismiss();
}
}
@Override
public void onError(@NonNull Throwable e) {
super.onError(e);
if (mMaterialDialog != null) {
mMaterialDialog.dismiss();
}
}
}
7.加入调度类，方便调用线程切换和解决内存泄漏的问题
public class RxSchedulers {
public static <T> ObservableTransformer<T, T> observableIO2Main(final Context context) {
return upstream -> {
Observable<T> observable = upstream.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread());
return composeContext(context, observable);
};
}
public static <T> ObservableTransformer<T, T> observableIO2Main(final RxFragment fragment) {
return upstream -> upstream.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread()).compose(fragment.<T>bindToLifecycle());
}
private static <T> ObservableSource<T> composeContext(Context context, Observable<T> observable) {
if(context instanceof RxActivity) {
return observable.compose(((RxActivity) context).bindUntilEvent(ActivityEvent.DESTROY));
} else if(context instanceof RxFragmentActivity){
return observable.compose(((RxFragmentActivity) context).bindUntilEvent(ActivityEvent.DESTROY));
}else if(context instanceof RxAppCompatActivity){
return observable.compose(((RxAppCompatActivity) context).bindUntilEvent(ActivityEvent.DESTROY));
}else {
return observable;
}
}
}
使用
讲了那么多，那么如何使用这个封装呢？下面来看下如何使用。
RxHttp.getInstance().getSyncServer().getLatestVersion("1", "1.0.0")
.compose(RxSchedulers.observableIO2Main(this))
.subscribe(new ProgressObserver<String>(this) {
@Override
public void onSuccess(String result) {
Toast.makeText(MainActivity.this, result, Toast.LENGTH_SHORT).show();
}
@Override
public void onFailure(Throwable e, String errorMsg) {
}
});
是不是封装后的代码显得更为简洁一点呢？欢迎大佬多多指正。
如果感兴趣可以看下github上源码github项目链接
