从URL下载图像到SD卡

Question

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) (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((Target) file);

    }

}

Answer 1

使用毕加索并加载到目标中

我同意Ichigo Kurosaki的回答.以下是如何使用毕加索和毕加索目标的详细示例.

你如何称呼毕加索代码

Picasso.with(ImageDetailActivity.this).load(
galleryObjects.get(mViewPager.getCurrentItem()).fullImagePath).into(target);

毕加索目标示例

private Target target = new Target() {
    @Override
    public void onBitmapLoaded(final Bitmap bitmap, Picasso.LoadedFrom from) {
        new Thread(new Runnable() {
            @Override
            public void run() {

                File file = new File(
                    Environment.getExternalStorageDirectory().getPath() 
                    + "/saved.jpg");
                try {
                        file.createNewFile();
                        FileOutputStream ostream = new FileOutputStream(file);
                        bitmap.compress(Bitmap.CompressFormat.JPEG,100,ostream);
                        ostream.close();
                }
                catch (Exception e) {
                        e.printStackTrace();
                }
            }
        }).start();
    }

    @Override
    public void onBitmapFailed(Drawable errorDrawable) {}

    @Override
    public void onPrepareLoad(Drawable placeHolderDrawable) {}
};

Answer 2

你可以使用它AsyncTask,这样你就不会得到OnMainThread例外.

  class DownloadFile extends AsyncTask<String,Integer,Long> {
    ProgressDialog mProgressDialog = new ProgressDialog(MainActivity.this);// Change Mainactivity.this with your activity name. 
    String strFolderName;
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        mProgressDialog.setMessage("Downloading");
        mProgressDialog.setIndeterminate(false);
        mProgressDialog.setMax(100);
        mProgressDialog.setCancelable(true);
        mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
        mProgressDialog.show();
    }
    @Override
    protected Long doInBackground(String... aurl) {
        int count;
        try {
            URL url = new URL((String) aurl[0]);
            URLConnection conexion = url.openConnection();
            conexion.connect();
            String targetFileName="Name"+".rar";//Change name and subname
            int lenghtOfFile = conexion.getContentLength();
            String PATH = Environment.getExternalStorageDirectory()+ "/"+downloadFolder+"/";
            File folder = new File(PATH);
            if(!folder.exists()){
                folder.mkdir();//If there is no folder it will be created.
            }
            InputStream input = new BufferedInputStream(url.openStream());
            OutputStream output = new FileOutputStream(PATH+targetFileName);
            byte data[] = new byte[1024];
            long total = 0;
            while ((count = input.read(data)) != -1) {
                total += count;
                       publishProgress ((int)(total*100/lenghtOfFile));
                output.write(data, 0, count);
            }
            output.flush();
            output.close();
            input.close();
        } catch (Exception e) {}
        return null;
    }
    protected void onProgressUpdate(Integer... progress) {
         mProgressDialog.setProgress(progress[0]);
         if(mProgressDialog.getProgress()==mProgressDialog.getMax()){
            mProgressDialog.dismiss();
            Toast.makeText(fa, "File Downloaded", Toast.LENGTH_SHORT).show();
         }
    }
    protected void onPostExecute(String result) {
    }
}

将此课程复制到您的活动中.它不能是另一种方法.

你可以称之为 new DownloadFile().execute(“yoururl”);

另外,将这些权限添加到清单中.

  <uses-permission android:name="android.permission.INTERNET"> </uses-permission>
  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
 <uses-permission android:name="android.permission.READ_PHONE_STATE"></uses-permission>

Answer 3

检查这些链接

为什么要使用Android Picasso库下载图片？

http://www.opensourcealternative.org/tutorials/android-tutorials/android-picasso-save-image-tutorial/

http://www.101apps.co.za/articles/gridview-tutorial-using-the-picasso-library.html

http://www.youtube.com/watch?v=tRTFwzUH_ek

http://square.github.io/picasso/

使用 Picasso，您的代码将只有 1 行

Picasso.with(context).load("your URL").into(your_imageView);

存储到外部 SD 卡

Android 将文件保存到外部存储

在Android的外部存储中写入文件

http://www.javatpoint.com/android-external-storage-example