OkHttpFinalConfiguration.Builder builder = new OkHttpFinalConfiguration.Builder();
OkHttpFinal.getInstance().init(builder.build());

List<File> files = new ArrayList<>();
File file = new File("...");
RequestParams params = new RequestParams(this);//请求参数
params.addFormDataPart("username", mUserName);//表单数据
params.addFormDataPart("password", mPassword);//表单数据
params.addFormDataPart("file", file);//上传单个文件
params.addFormDataPart("files", files);//上传多个文件
params.addHeader("token", token);//添加header信息
HttpRequest.post(Api.LOGIN, params, new BaseHttpRequestCallback<LoginResponse>() {

//请求网络前
@Override
public void onStart() {
	buildProgressDialog().show();
}

//这里只是网络请求成功了（也就是服务器返回JSON合法）没有没有分装具体的业务成功与失败，大家可以参考demo去分装自己公司业务请求成功与失败
@Override
protected void onSuccess(LoginResponse loginResponse) {
	toast(loginResponse.getMsg());
}

//请求失败（服务返回非法JSON、服务器异常、网络异常）
@Override
public void onFailure(int errorCode, String msg) {
	toast("网络异常~，请检查你的网络是否连接后再试");
}
 
//请求网络结束   
@Override
public void onFinish() {
    dismissProgressDialog();
}

String url = "http://219.128.78.33/apk.r1.market.hiapk.com/data/upload/2015/05_20/14/com.speedsoftware.rootexplorer_140220.apk";
File saveFile = new File("/sdcard/rootexplorer_140220.apk");
HttpRequest.download(url, saveFile, new FileDownloadCallback() {
    //开始下载
    @Override 
    public void onStart() {
        super.onStart();
    }

	//下载进度
    @Override
    public void onProgress(int progress, long networkSpeed) {
        super.onProgress(progress, networkSpeed);
        mPbDownload.setProgress(progress);
        //String speed = FileUtils.generateFileSize(networkSpeed);
    }

	//下载失败
    @Override 
    public void onFailure() {
        super.onFailure();
        Toast.makeText(getBaseContext(), "下载失败", Toast.LENGTH_SHORT).show();
    }

	//下载完成（下载成功）
    @Override 
    public void onDone() {
        super.onDone();
        Toast.makeText(getBaseContext(), "下载成功", Toast.LENGTH_SHORT).show();
    }
});