OK工具类

public class OkHttpUtils {
    private static OkHttpUtils okHttpUtils;
    private final Handler mhandler;
    private OkHttpClient client;
    private OkHttpUtils(){
        mhandler = new Handler(Looper.getMainLooper());
        client = new OkHttpClient.Builder()
                .connectTimeout(5000, TimeUnit.MILLISECONDS)
                .readTimeout(5000, TimeUnit.MILLISECONDS)
                .writeTimeout(5000, TimeUnit.MILLISECONDS)
                .build();
    }
    public static OkHttpUtils getInstance() {
        if (okHttpUtils == null) {
            synchronized (OkHttpUtils.class) {
                if (okHttpUtils == null) {
                    return okHttpUtils = new OkHttpUtils();
                }
            }
        }
        return okHttpUtils;
    }
    public void doGet(String url, final OkCallback okCallback) {
        Request request = new Request.Builder()
                .get()
                .url(url)
                .build();

        final Call call = client.newCall(request);
        call.enqueue(new Callback() {
            @Override
            public void onFailure(Call call, final IOException e) {
                if (okCallback != null) {
                    mhandler.post(new Runnable() {
                        @Override
                        public void run() {
                            okCallback.onFailure(e);
                        }
                    });

                }
            }

            @Override
            public void onResponse(Call call, final Response response) throws IOException {

                try {
                    if (response != null && response.isSuccessful()) {
                        final String json = response.body().string();
                        mhandler.post(new Runnable() {
                            @Override
                            public void run() {
                                if (okCallback != null) {
                                    okCallback.onResponse(json);
                                    return;
                                }

                            }
                        });
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }

            }
        });
    }

    public void doPost(String url, Map<String, String> map, final OkCallback okCallback) {

        FormBody.Builder builder = new FormBody.Builder();
        if (map != null) {
            for (String key : map.keySet()) {
                builder.add(key, map.get(key));
            }
        }
        FormBody formBody = builder.build();
        Request request = new Request.Builder()
                .post(formBody)
                .url(url)
                .build();
        final Call call = client.newCall(request);
        call.enqueue(new Callback() {
            @Override
            public void onFailure(Call call, final IOException e) {
                if (okCallback != null) {
                    mhandler.post(new Runnable() {
                        @Override
                        public void run() {
                            okCallback.onFailure(e);
                        }
                    });

                }
            }

            @Override
            public void onResponse(Call call, final Response response) throws IOException {

                try {
                    if (response != null && response.isSuccessful()) {
                        final String json = response.body().string();
                        mhandler.post(new Runnable() {
                            @Override
                            public void run() {
                                if (okCallback != null) {
                                    okCallback.onResponse(json);
                                    return;
                                }
                            }
                        });
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
                if (okCallback != null) {
                    okCallback.onFailure(new Exception("网络异常"));
                }

            }
        });
    }

    public interface OkCallback {
        void onFailure(Exception e);

        void onResponse(String json);
    }
}