如何从android中的imageview中的url网站获取图像 [英] How to get image from url website in imageview in android

问题描述

我正在尝试从url网站获取ImageView中的图像，但图像没有显示，
这段代码有什么问题？
这是图片的网址。

I am trying to get image in ImageView from url website but the image not show so, What is the wrong in this code? This is the url of the image.

这是我的主要活动

ImageView i;
private Bitmap bitmap;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    i=(ImageView)findViewById(R.id.ImageView1);




    bitmap=GetBitmapfromUrl("http://test-dashboard1.seeloz.com/system/images/products_images/86/5454544114_1401886223?1401886223");
    i.setImageBitmap(bitmap);


}


public Bitmap GetBitmapfromUrl(String scr) {
    try {
        URL url=new URL(scr);
        HttpURLConnection connection=(HttpURLConnection)url.openConnection();
        connection.setDoInput(true);
        connection.connect();
        InputStream input=connection.getInputStream();
        Bitmap bmp = BitmapFactory.decodeStream(input);
        return bmp;



    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
        return null;

    }
}}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="85dp"
        android:layout_marginTop="179dp"
        android:src="@drawable/ic_launcher" />

</RelativeLayout>

我的AndroidManifest

my AndroidManifest

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.image"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.INTERNET"/>
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.image.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

推荐答案

在主线程中进行网络IO是邪恶的。最好避免。

Doing network IO in the main thread is evil. Better to avoid.

此外 - 您的网址资源访问错误。

Also - your url resource access is wrong.

请使用以下内容：

 private Bitmap bmp;

   new AsyncTask<Void, Void, Void>() {                  
        @Override
        protected Void doInBackground(Void... params) {
            try {
                InputStream in = new URL(IMAGE_URL).openStream();
                bmp = BitmapFactory.decodeStream(in);
            } catch (Exception e) {
               // log error
            }
            return null;
        }

        @Override
        protected void onPostExecute(Void result) {
            if (bmp != null)
                imageView.setImageBitmap(bmp);
        }

   }.execute();

这是将url资源加载到显示中的旧方法。坦率地说，我没有在 long 时间内编写这样的代码。 排球和 Picasso 比我更好地做了
，包括透明的本地缓存，多个加载器线程管理和
，可以实现有效的resize-before-load策略。除了咖啡以外所有：）

This is the 'old way' of loading url resources into display. Frankly speaking, I have not written such code in a long time. Volley and Picasso simply do it much better than me, including transparent local cache, multiple loader-threads management and enabling effective resize-before-load policies. All but coffee :)

这篇关于如何从android中的imageview中的url网站获取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！