extends ImageView : ImageView « UI « Android

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Android » UI » ImageView 
extends ImageView
  
package app.test;

import java.io.BufferedInputStream;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;

import org.apache.http.util.ByteArrayBuffer;

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.AttributeSet;
import android.widget.ImageView;

class WebImageView extends ImageView {

  private Drawable mPlaceholder, mImage;
  public WebImageView(Context context, AttributeSet attrs, int defaultStyle) {
    super(context, attrs, defaultStyle);
  }

  public void setPlaceholderImage(Drawable drawable) {
    mPlaceholder = drawable;
    if (mImage == null) {
      setImageDrawable(mPlaceholder);
    }
  }

  public void setPlaceholderImage(int resid) {
    mPlaceholder = getResources().getDrawable(resid);
    if (mImage == null) {
      setImageDrawable(mPlaceholder);
    }
  }

  public void setImageUrl(String url) {
    DownloadTask task = new DownloadTask();
    task.execute(url);
  }

  private class DownloadTask extends AsyncTask<String, Void, Bitmap> {
    @Override
    protected Bitmap doInBackground(String... params) {
      String url = params[0];
      try {
        BufferedInputStream bis = new BufferedInputStream((new URL(url)).openConnection().getInputStream());
        ByteArrayBuffer baf = new ByteArrayBuffer(50);
        int current = 0;
        while ((current = bis.read()) != -1) {
          baf.append((bytecurrent);
        }
        byte[] imageData = baf.toByteArray();
        return BitmapFactory.decodeByteArray(imageData, 0,imageData.length);
      catch (Exception exc) {
        return null;
      }
    }

    @Override
    protected void onPostExecute(Bitmap result) {
      mImage = new BitmapDrawable(result);
      if (mImage != null) {
        setImageDrawable(mImage);
      }
    }
  };
}

public class Test extends Activity {
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    WebImageView imageView = (WebImageViewfindViewById(R.id.webImage);
    imageView.setPlaceholderImage(R.drawable.icon);
    imageView.setImageUrl("http://yourdomain.com/a.gif");
  }
}
//main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:orientation="vertical">
  <app.test.WebImageView
    android:id="@+id/webImage"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
  />
</LinearLayout>

   
    
  
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