Android下载多张图片保存到本地

1使用xutils3进行下载
2先实现下载一张图片到本地
3使用for循环实现多张图片

/**
     * 文件下载地址
     */
    String downloadUrl = "";

    /**
     * 下载文件的保存位置
     */
    String saveFilePath = "";


//点击事件
  mUpDataBt.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(final View v) {
                final ProgressDialog dialog = new ProgressDialog(MainActivity.this);
                dialog.setTitle("图片更新中");
                dialog.show();
                listImage.clear();
                listImage = dbUtil.findPicName();
//                没有skuimg文件夹则创建skuimg
                String sdPath = getExternalFilesDir(Environment.DIRECTORY_PICTURES) + "/skuimg";
                File file = new File(sdPath);
                if (!file.exists()) {
                    file.mkdirs();
                    Log.e("wy", "创建了skuimg文件夹");
                }
                new Thread() {
                    @Override
                    public void run() {
                        super.run();
                        for (int i = 0; i < listImage.size(); i++) {
                            Object imageString = listImage.get(i);
                            if (imageString != null) {
                                downloadUrl = Constant.BASE_URL + "/" + imageString;
                                saveFilePath = getExternalFilesDir(Environment.DIRECTORY_PICTURES) + "/" + imageString;
                                Log.e("wy", "saveFilePath: " + saveFilePath);
                                DownLoadUtil.DownLoadFile(downloadUrl, saveFilePath, new MyCallBack<File>() {

                                    @Override
                                    public void onSuccess(File result) {
                                        super.onSuccess(result);

//                            DownLoadUtil.showToast(MainActivity.this, "下载成功");
                                    }

                                    @Override
                                    public void onError(Throwable ex, boolean isOnCallback) {
                                        super.onError(ex, isOnCallback);
                                        dialog.dismiss();
                                        Log.e("wy", "图片下载失败原因: " + ex.getMessage());
//                                DownLoadUtil.showToast(MainActivity.this, "下载失败");
                                    }

                                });
                            }

                        }
                        Log.e("wy", "run: " + "下载图片成功");
                        dialog.dismiss();

                    }
                }.start();


                return true;
            }
        });

package com.wintec.huashang.utils;

import android.content.Context;
import android.widget.Toast;

import org.xutils.common.Callback;
import org.xutils.http.RequestParams;
import org.xutils.x;

public class DownLoadUtil {
    /**
     * 下载文件
     */
    public static <T> Callback.Cancelable DownLoadFile(String url, String filepath, Callback.CommonCallback<T> callback) {
        RequestParams params = new RequestParams(url);
        //设置断点续传
        params.setAutoResume(true);
        params.setSaveFilePath(filepath);
        Callback.Cancelable cancelable = x.http().get(params, callback);
        return cancelable;
    }

    /**
     * 单例吐司
     */
    private static Toast toast;
    public static void showToast(Context context, String msg) {
        if (toast == null) {
            toast = Toast.makeText(context, msg, Toast.LENGTH_SHORT);
        }
        toast.setText(msg);
        toast.show();
    }



}

package com.wintec.huashang.utils;

import org.xutils.common.Callback;

public class MyCallBack<ResultType> implements Callback.CommonCallback<ResultType> {

    @Override
    public void onSuccess(ResultType result) {
        //根据需求进行请求成功的逻辑处理
    }

    @Override
    public void onError(Throwable ex, boolean isOnCallback) {
        //根据需求进行请求网络失败的逻辑处理
    }

    @Override
    public void onCancelled(CancelledException cex) {

    }

    @Override
    public void onFinished() {

    }
}

查表中某一列的全部数据的sql语句

 public ArrayList findPicName() {
        ArrayList goodsList = new ArrayList();
//        Cursor cursor = mSQLiteDatabase.rawQuery("select name  from Person where searchKey like ? ", new String[]{"'%"+searchKey+"%'"});
        Cursor cursor = mSQLiteDatabase.rawQuery("select previewImage  from Person  ", new String[]{});
        int count = cursor.getCount();
        Log.e("wy", "名称同类的数量: " + count);
        for (int i = 0; i < count; i++) {
            while (cursor.moveToNext()) {
//                Log.e("wy","获取到分类商品: "+  cursor.getString(i));
                String goods = cursor.getString(i);
                goodsList.add(goods);
            }
        }
        Log.e("wy", "集合大小为: " + goodsList.size());

        cursor.close();
        return goodsList;

    }