okhttp封裝

public class OkHttpUtils {
    private Handler handler = new Handler();
    public Handler getHandler(){
        return handler;
    }
    //單例
    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();
        }
    }

    //公用的get請求方法
    public void doGet(String url, Callback callback){
        initOkHttpClient();
        Request request = new Request.Builder().url(url).build();
        Call call = client.newCall(request);
        call.enqueue(callback);
    }
	
}

======================================================

public abstract class OnUiCallback implements Callback{
    private Handler handler = OkHttpUtils.getInstance().getHandler();
    public abstract void onFailed(Call call, IOException e);
    public abstract void onSuccess(String result) throws IOException;

    @Override
    public void onFailure(final Call call, final IOException e) {
        //該方法就是把  線程post到handler所在的線程
        handler.post(new Runnable() {
            @Override
            public void run() {
                onFailed(call, e);
            }
        });

    }

    @Override
    public void onResponse(final Call call, final Response response) throws IOException {
        final String result = response.body().string();
        
        handler.post(new Runnable() {
            @Override
            public void run() {
                try {
                    onSuccess(result);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        });
    }
}