Android Open Source - callerid-for-android Loader Image View

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License

The source code is released under:

GNU General Public License

Java Source Code

package com.blundell.tut;
/*w w w. ja v  a  2s  . c  o  m*/
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;

import roboguice.RoboGuice;
import roboguice.util.Ln;
import android.content.Context;
import android.graphics.drawable.Drawable;
import android.os.Handler;
import android.os.Handler.Callback;
import android.os.Message;
import android.util.AttributeSet;
import android.view.View;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ProgressBar;

/**
 * Free for anyone to use, just say thanks and share :-)
 * @author Blundell
 *
 */
public class LoaderImageView extends LinearLayout{

  private static final int COMPLETE = 0;
  private static final int FAILED = 1;
  private static final int SPIN = 2;

  private Context mContext;
  private Drawable mDrawable;
  private ProgressBar mSpinner;
  private ImageView mImage;
  private Integer errorResource;
  
  /**
   * This is used when creating the view in XML
   * To have an image load in XML use the tag 'image="http://developer.android.com/images/dialog_buttons.png"'
   * To specify the image to display in case of failure, use 'error="R.drawable.something"'
   * Replacing the url with your desired image
   * Once you have instantiated the XML view you can call
   * setImageDrawable(url) to change the image
   * @param context
   * @param attrSet
   */
  public LoaderImageView(final Context context, final AttributeSet attrSet) {
    super(context, attrSet);
    RoboGuice.getInjector(context).injectMembers(this);
    final String url = attrSet.getAttributeValue(null, "image");
    errorResource = attrSet.getAttributeResourceValue(null, "error", 0);
    if(errorResource == 0) errorResource = null;
    if(url != null){
      instantiate(context, url);
    } else {
      instantiate(context, null);
    }
  }
  
  /**
   * This is used when creating the view programatically
   * Once you have instantiated the view you can call
   * setImageDrawable(url) to change the image
   * @param context the Activity context
   * @param imageUrl the Image URL you wish to load
   */
  public LoaderImageView(final Context context, final String imageUrl) {
    super(context);
    instantiate(context, imageUrl);    
  }

  /**
   *  First time loading of the LoaderImageView
   *  Sets up the LayoutParams of the view, you can change these to
   *  get the required effects you want
   */
  private void instantiate(final Context context, final String imageUrl) {
    mContext = context;
    
    mImage = new ImageView(mContext);
    
    mImage.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
    
    mSpinner = new ProgressBar(mContext);
    mSpinner.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
      
    mSpinner.setIndeterminate(true);
    
    addView(mSpinner);
    addView(mImage);
    
    if(imageUrl == null){
      spin();
    }else{
      setImageDrawable(imageUrl);
    }
  }
  
  /**
   * Show the spinner
   */
  public void spin(){
    imageLoadedHandler.sendEmptyMessage(SPIN);
  }

  /**
   * Set's the view's drawable, this uses the Internet to retrieve the image
   * don't forget to add the correct permissions to your manifest
   * @param imageUrl the url of the image you wish to load
   */
  public void setImageDrawable(final String imageUrl) {
    mDrawable = null;
    mSpinner.setVisibility(View.VISIBLE);
    mImage.setVisibility(View.GONE);
    new Thread(){
      public void run() {
        try {
          if(imageUrl==null){
            imageLoadedHandler.sendEmptyMessage(FAILED);
          }else{
            mDrawable = getDrawableFromUrl(imageUrl);
            imageLoadedHandler.sendEmptyMessage(COMPLETE);
          }
        } catch (MalformedURLException e) {
          imageLoadedHandler.sendEmptyMessage(FAILED);
        } catch (IOException e) {
          imageLoadedHandler.sendEmptyMessage(FAILED);
        }
      };
    }.start();
  }
  
  public void setImageResource(int resId){
    mDrawable = getResources().getDrawable(resId);
    imageLoadedHandler.sendEmptyMessage(COMPLETE);
  }
  
  public void setErrorResource(int resId){
    this.errorResource = resId;
  }
  
  /**
   * Callback that is received once the image has been downloaded
   */
  private final Handler imageLoadedHandler = new Handler(new Callback() {
    public boolean handleMessage(Message msg) {
      Ln.v("Message is: %s", msg.what);
      switch (msg.what) {
      case COMPLETE:
        mImage.setImageDrawable(mDrawable);
        mImage.setVisibility(View.VISIBLE);
        mSpinner.setVisibility(View.GONE);
        break;
      case FAILED:
        if(errorResource == null){
          mImage.setVisibility(View.GONE);
        }else{
          mImage.setImageResource(errorResource);
          mImage.setVisibility(View.VISIBLE);
        }
        mSpinner.setVisibility(View.GONE);
        break;
      case SPIN:
        mImage.setVisibility(View.GONE);
        mSpinner.setVisibility(View.VISIBLE);
        break;
      }
      //the image could be of any dimensions. Set the dimensions of the image to the same dimensions as the LoaderImageView so the LoaderImageView doesn't suddenly drastically grow/shrink when the image loads.
      mImage.setLayoutParams(new LayoutParams(getMeasuredWidth(), getMeasuredHeight()));
      return true;
    }    
  });

  /**
   * Pass in an image url to get a drawable object
   * @return a drawable object
   * @throws IOException
   * @throws MalformedURLException
   */
  private Drawable getDrawableFromUrl(final String url) throws IOException, MalformedURLException {
    final InputStream inputStream = new URL(url).openStream();
    try{
      return Drawable.createFromStream(inputStream, "name");
    }finally{
      inputStream.close();
    }
  }
}

Java Source Code List

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