将图像从 URL 加载到 Imageview

Question

我正在尝试使用此网址中的图片： http://www.bisonsoftware.us/hhs/image/1.png

我想拍摄这张图片并将其设置在 imageview 中，我只是在寻找最简单的方法。

我尝试了这个解决方案，但它似乎对我不起作用，它给出了一个错误，说 malformedurlexception： Load image from url

Answer 1

使用universal image library：

在您的项目中添加此库后。 在必要的地方写下这段代码

ImageLoader imageloader;
DisplayImageOptions options;
imageloader = ImageLoader.getInstance();
        String url="http://www.bisonsoftware.us/hhs/image/1.png";
        imageloader.init(ImageLoaderConfiguration.createDefault(getApplicationContext()));
        options = new DisplayImageOptions.Builder()
                .showImageForEmptyUri(R.drawable.ic_empty)
                .showImageOnFail(R.drawable.ic_error)
                .resetViewBeforeLoading(true).cacheOnDisk(true)
                .imageScaleType(ImageScaleType.EXACTLY)
                .bitmapConfig(Bitmap.Config.RGB_565).considerExifParams(true)
                .displayer(new FadeInBitmapDisplayer(300)).build();

imageloader.displayImage(url,imageview);

Answer 2

使用毕加索图书馆https://square.github.io/picasso/

应该是这样的：

Picasso.with(context).load("http://www.bisonsoftware.us/hhs/image/1.png").into(imageView);

Answer 3

如果你只想使用原生安卓代码，可以使用AsyncTask下载，然后设置在onPostExecute。

称它为：

//pass image view while creating AskyncTask object and pass url as parameter
new DownloadImageTask((ImageView) findViewById(R.id.yourImageView)).execute("your_url_here");

要调用的AsynTask：

private class DownloadImageTask extends AsyncTask<String, Void, Bitmap> {
    ImageView bmImage;

    public DownloadImageTask(ImageView bmImage) {
        this.bmImage = bmImage;
    }

    protected Bitmap doInBackground(String... urls) {
        String urldisplay = urls[0];
        Bitmap mIcon11 = null;
        try {
            InputStream in = new java.net.URL(urldisplay).openStream();
            mIcon11 = BitmapFactory.decodeStream(in);
        } catch (Exception e) {
            Log.e("Error", e.getMessage());
            e.printStackTrace();
        }
        return mIcon11;
    }

    protected void onPostExecute(Bitmap result) {
        bmImage.setImageBitmap(result);
    }
}

我刚刚看到您在问题中提到的网址中也提到了类似的答案。这适用于我的应用程序。如果它给出MalformedUrlException，那么你可以尝试检查url是否正确，如果需要正确编码。

Answer 4

你可以像 Shobhit 描述的那样用困难的方式来做，或者有一个库可以为你做同样的事情（创建另一个线程来渲染图像），比如前面提到的 picasso 或 UniversalImageLoader：https://github.com/nostra13/Android-Universal-Image-Loader

Answer 5

public class MainActivity extends Activity {

private Bitmap bitmap;
private ImageView imageView;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    imageView=(ImageView)findViewById(R.id.imageView1);
    new downloadimage().execute();
}
private class downloadimage extends AsyncTask<Void, Void, Void>
{

    @Override
    protected Void doInBackground(Void... params) {
        URL url;
        try {
            url = new URL("http://www.bisonsoftware.us/hhs/image/1.png");
            bitmap = BitmapFactory.decodeStream(url.openConnection().getInputStream());


        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }


        return null;
    }
    @Override
    protected void onPostExecute(Void result) {
        // TODO Auto-generated method stub
        super.onPostExecute(result);
        imageView.setImageBitmap(bitmap);
    }
}
}

这对我有用。

Answer 6

尝试像这样实现。它对我有用，可以从 url 下载图像。 并且不要忘记在 manifest 文件中添加 Internet 权限，像这样-<uses-permission android:name="android.permission.INTERNET"/>

import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;

import android.app.Activity;
import android.app.ProgressDialog;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.os.Bundle;
import android.widget.ImageView;

public class MainActivity extends Activity {
ProgressDialog progressDialog;
ImageView imageView;
Bitmap map = null;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    imageView = (ImageView) findViewById(R.id.imageView);
    new loadImage().execute();
}

public class loadImage extends AsyncTask<Void, Void, Void> {

    @Override
    protected void onPreExecute() {

        progressDialog = new ProgressDialog(MainActivity.this);
        progressDialog.setMessage("Please wait...");
        progressDialog.setCancelable(false);
        progressDialog.show();

    }

    @Override
    protected Void doInBackground(Void... params) {

        map = downloadImage("http://www.bisonsoftware.us/hhs/image/1.png");

        return null;
    }

    @Override
    protected void onPostExecute(Void result) {
        progressDialog.dismiss();
        imageView.setImageBitmap(map);
    }
}

// Creates Bitmap from InputStream and returns it
private Bitmap downloadImage(String url) {
    Bitmap bitmap = null;
    InputStream stream = null;
    BitmapFactory.Options bmOptions = new BitmapFactory.Options();
    bmOptions.inSampleSize = 1;

    try {
        stream = getHttpConnection(url);
        bitmap = BitmapFactory.decodeStream(stream, null, bmOptions);
        stream.close();
    } catch (Exception e1) {
        e1.printStackTrace();
    }
    return bitmap;
}

// Makes HttpURLConnection and returns InputStream
private InputStream getHttpConnection(String urlString) throws IOException {
    InputStream stream = null;
    URL url = new URL(urlString);
    URLConnection connection = url.openConnection();

    try {
        HttpURLConnection httpConnection = (HttpURLConnection) connection;
        httpConnection.setRequestMethod("GET");
        httpConnection.connect();
        if (httpConnection.getResponseCode() == HttpURLConnection.HTTP_OK) {
            stream = httpConnection.getInputStream();
        }
    } catch (Exception ex) {
        ex.printStackTrace();
    }
    return stream;
}

@Override
public void onDestroy() {
    super.onDestroy();
    if (progressDialog != null && progressDialog.isShowing()) {
        progressDialog.cancel();
    }
}

@Override
protected void onStop() {
    super.onStop();
    if (progressDialog != null) {
        progressDialog.dismiss();
        progressDialog = null;
    }
}  
}

快乐编码:)