下载图像以在 Android 上查看图像 [英] Download image for imageview on Android

问题描述

我见过这个问题:android 如何下载 1mb 图像文件并设置为 ImageView
它没有解决我的问题，因为它只显示了如何在您已经拥有位图之后显示.

我正在尝试从 URL 下载图像，以便在 Android 设备上使用 ImageView 显示它.我不知道该怎么做.

I am trying to download an image from a URL to have it be displayed with an ImageView on an Android device. I am not sure how to do this.

我在互联网上环顾了一下，这是我目前拥有的代码:

I've looked around a bit on the internet, this is the code I have so far:

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    //Set local image
    ImageView image = (ImageView) findViewById(R.id.test_image);
    image.setImageResource(R.drawable.test2);

    //Prepare to download image
    URL url;        
    InputStream in;

    //BufferedInputStream buf;
    try {
        url = new URL("http://i.imgur.com/CQzlM.jpg");
        in = url.openStream();

        out = new BufferedOutputStream(new FileOutputStream("testImage.jpg"));
        int i;

         while ((i = in.read()) != -1) {
             out.write(i);
         }
         out.close();
         in.close();

        buf = new BufferedInputStream(in);
        Bitmap bMap = BitmapFactory.decodeStream(buf);
        image.setImageBitmap(bMap);
        if (in != null) {
        in.close();
        }
        if (buf != null) {
        buf.close();
        }
    } catch (Exception e) {
        Log.e("Error reading file", e.toString());
    }
}

推荐答案

代码可能会起作用，尽管您是在主线程上下载图像.这意味着当下载时间超过 5 秒时，您将看到著名的 ANR 对话框，并且您的应用程序将崩溃...

The code would probably work, alltough you are downloading your image on your main thread. This means that when it takes more than 5 seconds to download, you will be presented with the famous ANR dialog, and your app will crash...

您应该在后台线程中下载您的图像，然后将结果发布回您的主线程.回到主线程，你可以用下载的图像更新你的图像视图.

You should download your image in a background thread, and post the result back to your main thread. Back in the main thread, you can update your imageview with the downloaded image.

这是一个例子:

package nl.entreco.stackoverflow;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.URL;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.widget.ImageView;

public class StackOverflowActivity extends Activity {

//  
private ImageView mImageView;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    //Find the reference to the ImageView
    mImageView = (ImageView) findViewById(R.id.test_image);

    // You can set a temporary background here
    //image.setImageResource(null);

    // Start the DownloadImage task with the given url
    new DownloadImage().execute("http://i.imgur.com/CQzlM.jpg");
}


/**
 * Simple functin to set a Drawable to the image View
 * @param drawable
 */
private void setImage(Drawable drawable)
{
    mImageView.setBackgroundDrawable(drawable);
}

public class DownloadImage extends AsyncTask<String, Integer, Drawable> {

    @Override
    protected Drawable doInBackground(String... arg0) {
        // This is done in a background thread
        return downloadImage(arg0[0]);
    }

    /**
     * Called after the image has been downloaded
     * -> this calls a function on the main thread again
     */
    protected void onPostExecute(Drawable image)
    {
        setImage(image);
    }


    /**
     * Actually download the Image from the _url
     * @param _url
     * @return
     */
    private Drawable downloadImage(String _url)
    {
        //Prepare to download image
        URL url;        
        BufferedOutputStream out;
        InputStream in;
        BufferedInputStream buf;

        //BufferedInputStream buf;
        try {
            url = new URL(_url);
            in = url.openStream();

            /*
             * THIS IS NOT NEEDED
             * 
             * YOU TRY TO CREATE AN ACTUAL IMAGE HERE, BY WRITING
             * TO A NEW FILE
             * YOU ONLY NEED TO READ THE INPUTSTREAM 
             * AND CONVERT THAT TO A BITMAP
            out = new BufferedOutputStream(new FileOutputStream("testImage.jpg"));
            int i;

             while ((i = in.read()) != -1) {
                 out.write(i);
             }
             out.close();
             in.close();
             */

            // Read the inputstream 
            buf = new BufferedInputStream(in);

            // Convert the BufferedInputStream to a Bitmap
            Bitmap bMap = BitmapFactory.decodeStream(buf);
            if (in != null) {
                in.close();
            }
            if (buf != null) {
                buf.close();
            }

            return new BitmapDrawable(bMap);

        } catch (Exception e) {
            Log.e("Error reading file", e.toString());
        }

        return null;
    }

}

}

不要忘记将permission.INTERNET添加到您的清单中，如果没有，您将收到错误...

Don't forget to add the permission.INTERNET to your manifest, if not, you will get an error...

这篇关于下载图像以在 Android 上查看图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！