RxJava2+Retrofit2网络框架如何封装
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需求
封装之前要先明白需要满足哪些需求。
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
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
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 MapmRetrofitMap = 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(); } }
Restful风格接口
public interface SyncServerService { @GET("service/mobile/IsLatestVersion.ashx") Observable> 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{ 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; } }
fastjson的支持
由于项目中采用了fastjson,square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 ConverterresponseBodyConverter(Type type, Annotation[] annotations, Retrofit retrofit) { return new FastJsonResponseBodyConvert<>(type); } }
final class FastJsonRequestBodyConverterimplements Converter { 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 FastJsonResponseBodyConvertimplements Converter { private Type mType; public FastJsonResponseBodyConvert(Type type) { this.mType = type; } @Override public T convert(ResponseBody value) throws IOException { return JSON.parseObject(value.string(), mType); } }
数据返回统一处理
public abstract class BaseObserverimplements Observer > { @Override public final void onNext(@NonNull Response 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; } }
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 ProgressObserverextends BaseObserver { 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(); } } }
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 staticObservableTransformer observableIO2Main(final Context context) { return upstream -> { Observable observable = upstream.subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()); return composeContext(context, observable); }; } public static ObservableTransformer observableIO2Main(final RxFragment fragment) { return upstream -> upstream.subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()).compose(fragment. bindToLifecycle()); } private static ObservableSource composeContext(Context context, Observable 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; } } }
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(this) { @Override public void onSuccess(String result) { Toast.makeText(MainActivity.this, result, Toast.LENGTH_SHORT).show(); } @Override public void onFailure(Throwable e, String errorMsg) { } });
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