如何从android中的imageview中的url网站获取图像

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。 和比我更好地做了
，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 betterthan me, including transparent local cache, multiple loader-threads management andenabling 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！