封装OkHttp工具类

      OkHttp的返回数据在子线程，所以经常用到Handler去结合使用，使我们的代码特别多，看起来特别乱，所以我就封装了一下，使得我们使用时获得的数据在主线程中，我封装了两种形式，一种是okhttp和handler结合，一种是okhttp和Rxjava结合，希望能够帮到大家。

1.   okhttp和handler结合：

       以下是需要的依赖：

        compile 'com.squareup.okhttp3:okhttp:3.9.0'
        compile 'com.squareup.okio:okio:1.13.0'

  首先说一下怎么使用吧：

OkHttpUtils.getInstance().doGet("http://news-at.zhihu.com/api/4/news/latest",callback);

废话不多说，上工具类：

public abstract class OnUiCallback implements Callback {
    public abstract void onFailed(String eStr);
    public abstract void onSuccess(String result);

    private Observer observer=new Observer<String>() {
        @Override
        public void onCompleted() {

        }

        @Override
        public void onError(Throwable e) {
            onFailed("");
        }

        @Override
        public void onNext(String o) {
            onSuccess(o);
        }
    };

    @Override
    public void onFailure(Call call, IOException e) {
        String eStr=e.getMessage();
        Observable.just(eStr).subscribe(observer);
    }

    @Override
    public void onResponse(Call call, Response response) throws IOException {
        String result=response.body().string();
        Observable.just(result).observeOn(AndroidSchedulers.mainThread()).subscribe(observer);
    }

}

public class OkHttpUtils {
    private static OkHttpUtils okHttpUtils=new OkHttpUtils();
    private OkHttpUtils(){};
    public static OkHttpUtils getInstance(){
        return okHttpUtils;
    }

    private OkHttpClient client;
    private void initOkHttpClient(){
        if (client==null){
            client=new OkHttpClient.Builder().build();
        }
    }

    public void doGet(String path, Callback callback){
        initOkHttpClient();
        Request request=new Request.Builder().url(path).build();
        client.newCall(request).enqueue(callback);
    }
}

2.   okhttp和Rxjava结合：

        加上Rxjava的依赖：

         compile 'io.reactivex:rxjava:1.0.14'
	 compile 'io.reactivex:rxandroid:1.0.1'

使用方式：

        OkHttpUtils.getInstance().doGet("", new OnUiCallback() {
            @Override
            public void onFailed(String eStr) {
                //失败
            }

            @Override
            public void onSuccess(String result) {
                //成功
            }
        });

public class OkHttpUtils {
    private static OkHttpUtils okHttpUtils=new OkHttpUtils();
    private OkHttpUtils(){};
    public static OkHttpUtils getInstance(){
        return okHttpUtils;
    }

    private OkHttpClient client;
    private void initOkHttpClient(){
        if (client==null){
            client=new OkHttpClient.Builder().build();
        }
    }

    public void doGet(String path, Callback callback){
        initOkHttpClient();
        Request request=new Request.Builder().url(path).build();
        client.newCall(request).enqueue(callback);
    }
}

public abstract class OnUiCallback implements Callback {
    public abstract void onFailed(String eStr);
    public abstract void onSuccess(String result);

    private Observer observer=new Observer<String>() {
        @Override
        public void onCompleted() {

        }

        @Override
        public void onError(Throwable e) {
            onFailed("");
        }

        @Override
        public void onNext(String o) {
            onSuccess(o);
        }
    };

    @Override
    public void onFailure(Call call, IOException e) {
        String eStr=e.getMessage();
        Observable.just(eStr).subscribe(observer);
    }

    @Override
    public void onResponse(Call call, Response response) throws IOException {
        String result=response.body().string();
        Observable.just(result).observeOn(AndroidSchedulers.mainThread()).subscribe(observer);
    }

}