为什么图像不加载？ [英] Why image not loading?

问题描述

我的工作演示为我的项目。

I am working a demo for my project.

XML文件是如下：

<LinearLayout 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"
    tools:context="${relativePackage}.${activityClass}" >

    <ImageView 

        android:id="@+id/imageview"
        android:layout_height="match_parent"
        android:layout_width="match_parent"
        android:visibility="visible"
        android:layout_gravity="center"
        android:contentDescription="@string/content_description"
        />
</LinearLayout>

和我的活动是继到图像加载到的ImageView 。
实施的AsyncTask 的内部类。

And my Activity is following to load the image into ImageView. Implemented AsyncTask as inner class.

    public class LoadImageActivity extends Activity {

    ImageView image ;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.load_image);
        image = (ImageView)findViewById(R.id.imageview);
        String url = "http://java.sogeti.nl/JavaBlog/wp-content/uploads/2009/04/android_icon_256.png";
        LoadImageAsync loadImageAsync = new LoadImageAsync(url, image);
        loadImageAsync.execute(url);    

    }

在活动的的onCreate 方法我称之为的AsyncTask 加载图片

In Activity's onCreate method I called the AsyncTask to load image

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.load_image);
    image = (ImageView)findViewById(R.id.imageview);
    String url = "http://java.sogeti.nl/JavaBlog/wp-content/uploads/2009/04/android_icon_256.png";
    LoadImageAsync loadImageAsync = new LoadImageAsync(url, image);
    loadImageAsync.execute(url);    

}

在的AsyncTask 类，我有以下code这是我遵循的与此相关的堆栈溢出的链接。

In AsyncTask class I have the following code which is I followed the Stack Overflow link related to this.

该AsyncTask的类下面是我实现的内部类Activity类。

The AsyncTask class is below which I implemented as inner class to the Activity class.

public class LoadImageAsync extends AsyncTask<String, Void, Bitmap>{

    private String url;
    private ImageView imageView;

    public LoadImageAsync(String url, ImageView imageView) {
            this.url = url;
            this.imageView = imageView;
        }

    @Override
    protected Bitmap doInBackground(String... params) {         


        try {
            URL urlConnection = (URL) new URL(params[0]);
            HttpURLConnection connection = (HttpURLConnection) urlConnection
                    .openConnection();
            connection.setDoInput(true);
            connection.connect();
            InputStream input = connection.getInputStream();
            Bitmap myBitmap = BitmapFactory.decodeStream(input);
            return myBitmap;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;

    }

    @Override
    protected void onPostExecute(Bitmap result) {

        imageView.setImageBitmap(result);
        super.onPostExecute(result);
    }

}

什么错了，我做了？或任何错失？

What wrong I did? or anything missed?

什么是所有需要的图像时考虑的？

What are all need to consider when working on images?

和在此之后将转移到加载图像与 GridView控件。

And after this will move to loading images with GridView.

推荐答案

我会建议使用毕加索
Picasso.with（上下文）.load（http://java.sogeti.nl/JavaBlog/wp-content/uploads/2009/04/android_icon_256.png\").into(image);

I would recommend to use Picasso Picasso.with(context).load("http://java.sogeti.nl/JavaBlog/wp-content/uploads/2009/04/android_icon_256.png").into(image);

所以你不必担心OutMemoryException这很可能会发生时，你会实现这个GridView中的

So you don't need to worry about OutMemoryException that will most probably happen when you will implement this in the GridView

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