Retrofit在項目中的應用，Retrofit項目應用

Retrofit在項目中的應用，Retrofit項目應用

定義一個註解，用來對bean進行要序列化的欄位

import java.lang.annotation.Documented;import java.lang.annotation.ElementType;import java.lang.annotation.Retention;import java.lang.annotation.RetentionPolicy;import java.lang.annotation.Target;/** * 用於Gson命名策略的註解 */@Documented@Retention(RetentionPolicy.RUNTIME)@Target(ElementType.FIELD)public @interface ParamName {    String value();}

將註解對需要網路傳輸bean進行標註：

public class requestBean implements Parcelable {public static final int RESPONSE_OK = 1;@ParamName("id") private String mId;@ParamName("name") private String mName;@ParamName("result")private int mResult;@ParamName("message")private String mMessage;public int getResult() {return mResult;}public String getMessage() {return mMessage;}public String getId() {return mId;} public String getName() { return mName; }public boolean succeed() {return getResult() == RESPONSE_OK;}}

把定義好的註解封裝進gson

import com.google.gson.FieldNamingPolicy;import com.google.gson.FieldNamingStrategy;import com.google.gson.Gson;import com.google.gson.GsonBuilder;import com.newandbie.privatecustomize.Config;import com.newandbie.privatecustomize.annotate.ParamName;import com.newandbie.privatecustomize.model.Gender;import java.lang.reflect.Field;/** * 自訂的Gson */public class GsonUtils {    public static Gson newInstance() {        GsonBuilder builder = new GsonBuilder();        builder.setFieldNamingStrategy(new AnnotateNaming());               return builder.create();    }    private static class AnnotateNaming implements FieldNamingStrategy {        @Override        public String translateName(Field field) {            ParamName a = field.getAnnotation(ParamName.class);            return a != null ? a.value() : FieldNamingPolicy.IDENTITY.translateName(field);        }    }}

import com.squareup.okhttp.Cache;import com.squareup.okhttp.OkHttpClient;import android.content.Context;import java.io.File;import java.io.IOException;import java.util.concurrent.TimeUnit;/** * OkHttpClient自訂工具類 */public class OkHttpUtils {    private static OkHttpClient singleton;    public static OkHttpClient getInstance(Context context) {        if (singleton == null) {            synchronized (OkHttpUtils.class) {                if (singleton == null) {                    File cacheDir = new File(context.getCacheDir(), Config.RESPONSE_CACHE);                    singleton = new OkHttpClient();                    try {                        singleton.setCache(new Cache(cacheDir, Config.RESPONSE_CACHE_SIZE));                    } catch (IOException e) {                        e.printStackTrace();                    }                    singleton.setConnectTimeout(Config.HTTP_CONNECT_TIMEOUT, TimeUnit.MILLISECONDS);                    singleton.setReadTimeout(Config.HTTP_READ_TIMEOUT, TimeUnit.MILLISECONDS);                }            }        }        return singleton;    }}

定義Retrofit工具將以上兩個工具配置到RetrofitUtils

import android.content.Context;import retrofit.RestAdapter;import retrofit.client.OkClient;import retrofit.converter.GsonConverter;public class RetrofitUtils {    private static RestAdapter singleton;    public static <T> T createApi(Context context, Class<T> clazz) {        if (singleton == null) {            synchronized (RetrofitUtils.class) {                if (singleton == null) {                    RestAdapter.Builder builder = new RestAdapter.Builder();                    builder.setEndpoint(ip地址);//設定遠程地址                    builder.setConverter(new GsonConverter(GsonUtils.newInstance()));                    builder.setClient(new OkClient(OkHttpUtils.getInstance(context)));                    builder.setLogLevel(                            Config.DEBUG ? RestAdapter.LogLevel.FULL : RestAdapter.LogLevel.NONE);                    singleton = builder.build();                }            }        }        return singleton.create(clazz);    }}

那麼工具集準備好了，

使用retrofit放在父類以便子類調用

import retrofit.Callback;import retrofit.RetrofitError;import retrofit.client.Response;/** * 介面的基類 */public class BaseActivity extends ActionBarActivity {....    /**     * 建立API執行個體     *     * @param cls Api定義類的類型     * @param <T> 範型     * @return API執行個體     */    public  <T> T  createApi(Class<T> cls) {        return RetrofitUtils.createApi(this, cls);    }    public static abstract class ActivityCallback<T>            implements Callback<T> { <span style="white-space:pre"></span>//軟引用，緩衝引用對象        private final WeakReference<BaseActivity> mRef;        public ActivityCallback(BaseActivity activity) {            mRef = new WeakReference<BaseActivity>(activity);        }        public Activity getActivity() {            return mRef.get();        }        @Override        public void failure(RetrofitError error) {            final BaseActivity activity = mRef.get();                                          Response response = error.getResponse();                if (response != null) {                    Toast.makeText(activity, activity.getString(R.string.server_error),                            Toast.LENGTH_SHORT).show();                    Log.e(getLogTag(),                            "code:" + response.getStatus() + ", reason:" + response.getReason());                    error.printStackTrace();                }                    }    }.....  }

定義下面的一個REST API介面。 該介面定義了一個函數 ask,  該函數會通過HTTP post請求去訪問伺服器的//ellassy/teacher/ask
路徑並把返回的結果封裝為requestBean Java對象返回。

import retrofit.Callback;import retrofit.http.Field;import retrofit.http.FormUrlEncoded;import retrofit.http.Header;import retrofit.http.POST;public interface ExpertApi {    @FormUrlEncoded    @POST("/ellassy/teacher/ask")    void ask(@Header("token") String token, @Field("member_id") String memberId,            @Field("title") String title, @Field("description") String description,            @Field("teacher_id") String expertId,            Callback<requestBean> cb);}

rect用戶端請求服務端

import android.content.Context;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;import retrofit.client.Response;public class AskActivity extends implements View.OnClickListener {    private ExpertApi mExpertApi;   //...    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);       // ...        mExpertApi = createApi(ExpertApi.class);    }    @Override    public void onClick(View v) {       //...調用rest 介面        mExpertApi.ask(getToken(), mUserInfo.getId(), title, question, mExpertId,                new AskCallback(AskActivity.this));    }//回調介面返回從伺服器返回的資料    private static final class AskCallback extends ActivityCallback<requestBean> {        public AskCallback(AskActivity activity) {            super(activity);        }             @Override        public void success(requestBean requestbean, Response response) {            AskActivity activity = (AskActivity) getActivity();                                            if (requestbean.succeed()) {                    Toast.makeText(activity, "成功返回資料", Toast.LENGTH_SHORT).show();                    activity.finish();                } else {                    Toast.makeText(activity, askResponse.getMessage(), Toast.LENGTH_SHORT).show();                }         }                }}