How to get image from url website in imageview in

问题:

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.

It is my Main Activity

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;

    }
}}

in the XML file

<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>

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>

回答1:

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

Also - your url resource access is wrong.

Use something like this instead:

 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();

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 :)

回答2:

Give it a try with Picasso. It should take you almost one full line of code and less than a minute to set it up.

In your case, that would be:

Picasso.with(context).load(""http://imageurlgoeshere").into(i);

回答3:

If you're going to be loading multiple images from URL's in your app, it's definitely worth looking into:

nostra13's "Universal Image Loader"

It's an awesome library with tons of features to display images from URLs, cast to bitmaps, etc.

Once you've included the class and declared the imageloader + imageloader configuration, its a simple as this:

imageLoader.displayImage("http://www.yoursite.com/my_picture.png", imageView);

Where imageView is the imageView you would like the image to appear in.

回答4:

Your problem is not in code but with the server. Try this sample url and tell me if is it working:

http://cdn.sstatic.net/stackoverflow/img/apple-touch-icon.png