网络请求工具类HttpUtils

代码如下：

import android.app.Activity;import android.app.Dialog;import android.content.Context;import android.text.format.DateUtils;import android.view.LayoutInflater;import android.view.View;import android.view.animation.Animation;import android.view.animation.AnimationUtils;import android.widget.ImageView;import android.widget.RelativeLayout;import android.widget.Toast;import com.handmark.pulltorefresh.library.PullToRefreshBase;import org.xutils.common.Callback;import org.xutils.http.RequestParams;import org.xutils.x;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Date;import java.util.List;/** * @describe: 网络请求工具类 */public class HttpUtils {    private static Dialog sLoadDialog;//请求Dialog    private static List sCancelables = new ArrayList<>();//请求队列    /**     * 网络请求 get     *     * @param url      请求Url     * @param activity activity     * @param isDialog 是否开启进度条     * @param callBack 请求回调接口     */    public static void get(String url, Activity activity, final boolean isDialog, final CallBack callBack) {        //开启或关闭进度条        if (isDialog) {            sLoadDialog = getLoadingDialog(activity);        }        if (isDialog) {            sLoadDialog.show();        }        //开始请求        RequestParams params = new RequestParams(url);        Callback.Cancelable cancelable = x.http().get(params, new Callback.CommonCallback() {            @Override            public void onSuccess(String result) {                if (callBack != null) {                    callBack.onSuccess(result);                }            }            @Override            public void onError(Throwable ex, boolean isOnCallback) {                Toast.makeText(App.getInstance(), "网络出错", Toast.LENGTH_SHORT).show();            }            @Override            public void onCancelled(CancelledException cex) {            }            @Override            public void onFinished() {                if (isDialog && sLoadDialog != null) {                    sLoadDialog.dismiss();                }            }        });        sCancelables.add(cancelable);    }    /**     * 显示最后刷新时间     *     * @param refreshView pullToRefresh     */    public static void showTime(PullToRefreshBase refreshView) {        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");        String label = format.format(new Date());        // 显示最后更新的时间        refreshView.getLoadingLayoutProxy()                .setLastUpdatedLabel(label);    }    /**     * 取消请求     */    public static void cancelAll() {        if (sCancelables != null && sCancelables.size() > 0) {            for (int i = 0, len = sCancelables.size(); i < len; i++) {                sCancelables.get(i).cancel();            }            sCancelables.clear();        }    }    /**     * 得到自定义的progressDialog     *     * @param context Context     * @return 返回     */    public static Dialog getLoadingDialog(Context context) {        LayoutInflater inflater = LayoutInflater.from(context);        // 加载view        View view = inflater.inflate(R.layout.loading_dialog, null);        RelativeLayout layout = (RelativeLayout) view.findViewById(R.id.rel_loading);        // main.xml中的ImageView        ImageView spaceshipImage = (ImageView) view.findViewById(R.id.img_loading);        // 加载动画        Animation animation = AnimationUtils.loadAnimation(                context, R.anim.loading_animation);        // 使用ImageView显示动画        spaceshipImage.startAnimation(animation);        // 创建自定义样式dialog        Dialog loadingDialog = new Dialog(context, R.style.LoadingDialog);        // 不可以用“返回键”取消        loadingDialog.setCancelable(false);        // 设置布局        loadingDialog.setContentView(layout, new RelativeLayout.LayoutParams(                RelativeLayout.LayoutParams.MATCH_PARENT,                RelativeLayout.LayoutParams.MATCH_PARENT));        return loadingDialog;    }    /**     * 请求回调接口     */    public interface CallBack {        void onSuccess(String result);    }}

加载布局：

loading_dialog.xml

<?xml version="1.0" encoding="utf-8"?>

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