从 url 加载图像

我有一个图片 URL。我想在 ImageView 中显示来自此 URL 的图像，但我无法做到这一点。

如何做到这一点？

413434 次浏览
小开 
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;


import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.widget.ImageView;
import android.widget.Toast;


public class imageDownload {


Bitmap bmImg;
void downloadfile(String fileurl,ImageView img)
{
URL myfileurl =null;
try
{
myfileurl= new URL(fileurl);


}
catch (MalformedURLException e)
{


e.printStackTrace();
}


try
{
HttpURLConnection conn= (HttpURLConnection)myfileurl.openConnection();
conn.setDoInput(true);
conn.connect();
int length = conn.getContentLength();
int[] bitmapData =new int[length];
byte[] bitmapData2 =new byte[length];
InputStream is = conn.getInputStream();
BitmapFactory.Options options = new BitmapFactory.Options();


bmImg = BitmapFactory.decodeStream(is,null,options);


img.setImageBitmap(bmImg);


//dialog.dismiss();
}
catch(IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
//          Toast.makeText(PhotoRating.this, "Connection Problem. Try Again.", Toast.LENGTH_SHORT).show();
}




}




}

在你的活动中 获取图像视图和设置资源 下载(网址: yourImageview) ;

小开

下面是从 URL 显示图像的示例代码。

public static Void downloadfile(String fileurl, ImageView img) {
Bitmap bmImg = null;
URL myfileurl = null;
try {
myfileurl = new URL(fileurl);
} catch (MalformedURLException e) {
e.printStackTrace();
}
try {
HttpURLConnection conn = (HttpURLConnection) myfileurl.openConnection();
conn.setDoInput(true);
conn.connect();
int length = conn.getContentLength();
if (length > 0) {
int[] bitmapData = new int[length];
byte[] bitmapData2 = new byte[length];
InputStream is = conn.getInputStream();
bmImg = BitmapFactory.decodeStream(is);
img.setImageBitmap(bmImg);
}


} catch (IOException e) {
e.printStackTrace();
}
}
小开
最佳答案 
URL url = new URL("http://image10.bizrate-images.com/resize?sq=60&uid=2216744464");
Bitmap bmp = BitmapFactory.decodeStream(url.openConnection().getInputStream());
imageView.setImageBitmap(bmp);
小开

如果你只是单击一个按钮就可以加载图片，那么上面的答案是非常好的，但是如果你是在一个新的活动中这样做的话，它会使 UI 冻结一到两秒钟。环顾四周，我发现一个简单的异步任务消除了这个问题。

使用异步任务在活动结束时添加此类:

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);
}
}

并使用以下方法从 onCreate ()方法调用:

new DownloadImageTask((ImageView) findViewById(R.id.imageView1))
.execute(MY_URL_STRING);

不要忘记在清单文件中添加以下权限

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

对我很有效:)

小开

UrlImageViewHelper 将用在 URL 中找到的图像填充 ImageView。UrlImageViewHelper 将自动下载、保存和缓存 BitmapDrawables 的所有图像 URL。重复的 url 不会被加载到内存中两次。位图内存是使用弱引用哈希表管理的，因此一旦图像不再被您使用，它将被自动垃圾收集。

SetUrlDrawable (image/view，“ http://example.com/image.png”) ;

Https://github.com/koush/urlimageviewhelper

小开 
loadImage("http://relinjose.com/directory/filename.png");

给你

void loadImage(String image_location) {
URL imageURL = null;
if (image_location != null) {
try {
imageURL = new URL(image_location);
HttpURLConnection connection = (HttpURLConnection) imageURL
.openConnection();
connection.setDoInput(true);
connection.connect();
InputStream inputStream = connection.getInputStream();
bitmap = BitmapFactory.decodeStream(inputStream);// Convert to bitmap
ivdpfirst.setImageBitmap(bitmap);
} catch (IOException e) {
e.printStackTrace();
}
} else {
//set any default
}
}
小开

试试这个:

InputStream input = contentResolver.openInputStream(httpuri);
Bitmap b = BitmapFactory.decodeStream(input, null, options);
小开

试试这个 添加毕加索 lib jar 文件

Picasso.with(context)
.load(ImageURL)
.resize(width,height).noFade().into(imageView);
小开 
public class MainActivity extends Activity {


Bitmap b;
ImageView img;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
img = (ImageView)findViewById(R.id.imageView1);
information info = new information();
info.execute("");
}


public class information extends AsyncTask<String, String, String>
{
@Override
protected String doInBackground(String... arg0) {


try
{
URL url = new URL("http://10.119.120.10:80/img.jpg");
InputStream is = new BufferedInputStream(url.openStream());
b = BitmapFactory.decodeStream(is);


} catch(Exception e){}
return null;
}


@Override
protected void onPostExecute(String result) {
img.setImageBitmap(b);
}
}
}
小开

我根据 这个答案编写自己的加载程序。

具有载荷效应和外观效应:

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.ProgressBar;


import java.io.InputStream;


/**
* Created by Sergey Shustikov (pandarium.shustikov@gmail.com) at 2015.
*/
public class DownloadImageTask extends AsyncTask<String, Void, Bitmap>
{
public static final int ANIMATION_DURATION = 250;
private final ImageView mDestination, mFakeForError;
private final String mUrl;
private final ProgressBar mProgressBar;
private Animation.AnimationListener mOutAnimationListener = new Animation.AnimationListener()
{
@Override
public void onAnimationStart(Animation animation)
{


}


@Override
public void onAnimationEnd(Animation animation)
{
mProgressBar.setVisibility(View.GONE);
}


@Override
public void onAnimationRepeat(Animation animation)
{


}
};
private Animation.AnimationListener mInAnimationListener = new Animation.AnimationListener()
{
@Override
public void onAnimationStart(Animation animation)
{
if (isBitmapSet)
mDestination.setVisibility(View.VISIBLE);
else
mFakeForError.setVisibility(View.VISIBLE);
}


@Override
public void onAnimationEnd(Animation animation)
{


}


@Override
public void onAnimationRepeat(Animation animation)
{


}
};
private boolean isBitmapSet;


public DownloadImageTask(Context context, ImageView destination, String url)
{
mDestination = destination;
mUrl = url;
ViewGroup parent = (ViewGroup) destination.getParent();
mFakeForError = new ImageView(context);
destination.setVisibility(View.GONE);
FrameLayout layout = new FrameLayout(context);
mProgressBar = new ProgressBar(context);
FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
params.gravity = Gravity.CENTER;
mProgressBar.setLayoutParams(params);
FrameLayout.LayoutParams copy = new FrameLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
copy.gravity = Gravity.CENTER;
copy.width = dpToPx(48);
copy.height = dpToPx(48);
mFakeForError.setLayoutParams(copy);
mFakeForError.setVisibility(View.GONE);
mFakeForError.setImageResource(android.R.drawable.ic_menu_close_clear_cancel);
layout.addView(mProgressBar);
layout.addView(mFakeForError);
mProgressBar.setIndeterminate(true);
parent.addView(layout, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
}


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


protected void onPostExecute(Bitmap result)
{
AlphaAnimation in = new AlphaAnimation(0f, 1f);
AlphaAnimation out = new AlphaAnimation(1f, 0f);
in.setDuration(ANIMATION_DURATION * 2);
out.setDuration(ANIMATION_DURATION);
out.setAnimationListener(mOutAnimationListener);
in.setAnimationListener(mInAnimationListener);
in.setStartOffset(ANIMATION_DURATION);
if (result != null) {
mDestination.setImageBitmap(result);
isBitmapSet = true;
mDestination.startAnimation(in);
} else {
mFakeForError.startAnimation(in);
}
mProgressBar.startAnimation(out);
}
public int dpToPx(int dp) {
DisplayMetrics displayMetrics = mDestination.getContext().getResources().getDisplayMetrics();
int px = Math.round(dp * (displayMetrics.xdpi / DisplayMetrics.DENSITY_DEFAULT));
return px;
}
}

添加权限

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

执行:

 new DownloadImageTask(context, imageViewToLoad, urlToImage).execute();
小开

尝试 picasso好，并完成在一个声明

Picasso.with(context)
.load(ImageURL)
.resize(width,height).into(imageView);

教程: Https://youtu.be/dxrqxsepc2s

(最新版本中的 注: ABC0已被重命名为 Picasso.get())

小开

我尝试过的最佳方法，而不是使用任何库

public Bitmap getbmpfromURL(String surl){
try {
URL url = new URL(surl);
HttpURLConnection urlcon = (HttpURLConnection) url.openConnection();
urlcon.setDoInput(true);
urlcon.connect();
InputStream in = urlcon.getInputStream();
Bitmap mIcon = BitmapFactory.decodeStream(in);
return  mIcon;
} catch (Exception e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
return null;
}
}
小开

对我来说，壁画是其他库中最好的。

只要 设计壁画，然后像这样简单地设置图像 URI:

draweeView.setImageURI(uri);

看看 这个的答案，解释一些壁画的好处。

小开

下面的代码向您展示了如何使用 RxAndroid 从 URL 字符串设置 ImageView。 首先，添加 RxAndroid 库2.0

dependencies {
// RxAndroid
compile 'io.reactivex.rxjava2:rxandroid:2.0.0'
compile 'io.reactivex.rxjava2:rxjava:2.0.0'


// Utilities
compile 'org.apache.commons:commons-lang3:3.5'


}

现在使用 setImageFromUrl 设置图像。

public void setImageFromUrl(final ImageView imageView, final String urlString) {


Observable.just(urlString)
.filter(new Predicate<String>() {
@Override public boolean test(String url) throws Exception {
return StringUtils.isNotBlank(url);
}
})
.map(new Function<String, Drawable>() {
@Override public Drawable apply(String s) throws Exception {
URL url = null;
try {
url = new URL(s);
return Drawable.createFromStream((InputStream) url.getContent(), "profile");
} catch (final IOException ex) {
return null;
}
}
})
.filter(new Predicate<Drawable>() {
@Override public boolean test(Drawable drawable) throws Exception {
return drawable != null;
}
})
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Consumer<Drawable>() {
@Override public void accept(Drawable drawable) throws Exception {
imageView.setImageDrawable(drawable);
}
});
}
小开

在清单中添加 Internet 权限

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

比创建如下方法,

 public static Bitmap getBitmapFromURL(String src) {
try {
Log.e("src", src);
URL url = new URL(src);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setDoInput(true);
connection.connect();
InputStream input = connection.getInputStream();
Bitmap myBitmap = BitmapFactory.decodeStream(input);
Log.e("Bitmap", "returned");
return myBitmap;
} catch (IOException e) {
e.printStackTrace();
Log.e("Exception", e.getMessage());
return null;
}
}

现在在 onCreate 方法中添加这个,

 ImageView img_add = (ImageView) findViewById(R.id.img_add);




img_add.setImageBitmap(getBitmapFromURL("http://www.deepanelango.me/wpcontent/uploads/2017/06/noyyal1.jpg"));

这对我有用。

小开

有两种方式:

1)使用 Glide 库 这是从 URL 加载图像的最佳方式，因为当你第二次试图显示相同的 URL 时，它将从缓存中显示，从而提高应用程序的性能

Glide.with(context).load("YourUrl").into(imageView);

从属关系: implementation 'com.github.bumptech.glide:glide:4.10.0'


2)使用 Stream 在这里你想要从一个 URL 图像创建一个位图

URL url = new URL("YourUrl");
Bitmap bitmap = BitmapFactory.decodeStream(url.openConnection().getInputStream());
imageView.setImageBitmap(bitmap);
小开

这是我使用 Adrian 的代码示例得到的工作解决方案:

private void loadImage(String pUrl) {
Thread imageDataThread = new Thread(() -> {
try {
URL tUrl = new URL(pUrl);
Bitmap imageBitmap = BitmapFactory.decodeStream(tUrl.openConnection().getInputStream());
runOnUiThread(() -> image_preview.setImageBitmap(imageBitmap));
} catch(IOException pExc) {
showToast("Error loading image for this question!");
pExc.printStackTrace();
}
});
imageDataThread.start();
}

注意: 您可以使用这个预定义的方法来加载图像位图，或者您可以使用您的，以防您需要调整图像大小或对图像进行类似的操作。


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