如何在android中显示来自url的图像 [英] How to show an image from an url in android

问题描述

我浏览了互联网，但找不到关于如何从 url 显示图像的工作示例.

I have looked around the internet but haven't been able to find a working example on how to show an image from an url.

下面的代码崩溃了，我不知道为什么.非常感谢任何帮助.谢谢.

The below code is crashing and I can't find out why.. Any help is greatly appreciated. Thanks.

TesteImages.java:

TesteImages.java:

package pac.image3;

import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.widget.ImageView;

public class TestImages extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
//        setContentView(R.layout.main);
        ImageView image = (ImageView) findViewById(R.id.test_image);

        String imageUrl = "http://www.small-world.net/_borders/small_world_logo.gif";
        try {
          ImageView i = (ImageView)findViewById(R.id.test_image);
          Bitmap bitmap = BitmapFactory.decodeStream((InputStream)new URL(imageUrl).getContent());
          i.setImageBitmap(bitmap);
          setContentView(image);
        } catch (MalformedURLException e) {
          e.printStackTrace();
        } catch (IOException e) {
          e.printStackTrace();
        }


    }
}

res/layout/main.xml:

res/layout/main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />

    <ImageView 
   android:id="@+id/test_image"
   android:src="@drawable/icon"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   />

</LinearLayout>

推荐答案

只要用下面的方法从url中画图:

Just use the following method to draw image from url:

Drawable drawable_from_url(String url, String src_name) throws 
   java.net.MalformedURLException, java.io.IOException 
{
   return Drawable.createFromStream(((java.io.InputStream)
      new java.net.URL(url).awagetContent()), src_name);
}

只需将字符串 url 传递给方法(对于 src_name 任何字符串)，它将返回一个可绘制对象，然后使用 imageview 的 setBckgroundDrawable() 方法设置图像的背景.

Just pass the string url to the method(and for src_name any string ) and it will return you a drawable object, then use setBckgroundDrawable() method of the imageview to set the background of the image.

这篇关于如何在android中显示来自url的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！