小编use*_*970的帖子

我正在使用教程创建一个图库应用程序,但收到以下错误:

abc目录路径无效!请设置图像目录名AppConstant.java类

请访问以下链接以查看整个教程的代码,因为我使用相同的代码:

http://www.androidhive.info/2013/09/android-fullscreen-image-slider-with-swipe-and-pinch-zoom-gestures/

我在UtilsClass中找到了这段代码:

else {//图像目录为空Toast.makeText(_context,AppConstant.PHOTO_ALBUM +"为空.请加载一些图像!",Toast.LENGTH_LONG).show(); }

    } else {
        AlertDialog.Builder alert = new AlertDialog.Builder(_context);
        alert.setTitle("Error!");
        alert.setMessage(AppConstant.PHOTO_ALBUM
                + " directory path is not valid! Please set the image directory name AppConstant.java class");
        alert.setPositiveButton("OK", null);
        alert.show();
    }

    return filePaths;

如何以编程方式创建缺少的目录而不是显示此错误对话框？

我正在尝试创建一个非常简单的图像下载应用程序.我想从这个网址下载所有图像到SD卡:https://www.dropbox.com/sh/5be3kgehyg8uzh2/AAA-jYcy_21nLBwnZQ3TBFAea

此代码适用于在imageview中加载图像:

package com.example.imagedownloadsample;

import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.widget.ImageView;

import com.squareup.picasso.Picasso;

public class MainActivity extends ActionBarActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.image_download);

        final ImageView img = (ImageView) (findViewById(R.id.imageView1));

        // File file = new File(Environment.getExternalStorageDirectory(),
        // "Android/data/com.usd.pop");

        Picasso.with(getApplicationContext())
                .load("http://8020.photos.jpgmag.com/3456318_294166_528c960558_m.jpg")
                .into(img);

    }

}

但当我尝试这样下载图像到SD卡我最终与不幸的应用程序停止错误:

package com.example.imagedownloadsample;

import java.io.File;

import android.os.Bundle;
import android.os.Environment;
import android.support.v7.app.ActionBarActivity;

import com.squareup.picasso.Picasso;
import com.squareup.picasso.Target;

public class MainActivity extends ActionBarActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.image_download);

        //final ImageView img = (ImageView) …