Android Open Source - android-screenshot-gallery Thumb View

From Project

Back to project page android-screenshot-gallery.

License

The source code is released under:

Apache License

If you think the Android project android-screenshot-gallery listed in this page is inappropriate, such as containing malicious code/tools or violating the copyright, please email info at java2s dot com, thanks.

Java Source Code

package com.demondevelopers.screenshotgallery;
/*  w  w  w.jav a2  s. c  o m*/
import android.content.Context;
import android.graphics.Bitmap;
import android.os.AsyncTask;
import android.provider.MediaStore.Images.Thumbnails;
import android.util.AttributeSet;
import android.widget.ImageView;

import static android.view.View.MeasureSpec.makeMeasureSpec;
import static android.view.View.MeasureSpec.getSize;
import static android.view.View.MeasureSpec.EXACTLY;


public class ThumbView extends ImageView
{
  private ThumbRequest mRequest;
  
  
  public ThumbView(Context context)
  {
    super(context);
    initView(context, null);
  }
  
  public ThumbView(Context context, AttributeSet attrs)
  {
    super(context, attrs);
    initView(context, attrs);
  }
  
  public ThumbView(Context context, AttributeSet attrs, int defStyle)
  {
    super(context, attrs, defStyle);
    initView(context, attrs);
  }
  
  protected void initView(Context context, AttributeSet attrs)
  {
    //
  }
  
  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
  {
    super.onMeasure(widthMeasureSpec, makeMeasureSpec(getSize(widthMeasureSpec), EXACTLY));
  }
  
  private String createCacheKey(long id, int kind)
  {
    return "thumb-" + kind + "-" + id;
  }
  
  public void setImageThumbnail(long id, int kind)
  {
    Bitmap cached = GalleryApp.from(getContext()).getImageFromCache(createCacheKey(id, kind));
    if(cached == null){
      cancelImageRequest();
      setImageResource(R.drawable.ic_picture);
      mRequest = new ThumbRequest(id, kind);
      mRequest.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
    }
    else{
      setImageBitmap(cached);
    }
  }
  
  private void cancelImageRequest()
  {
    if(mRequest != null && !mRequest.isCancelled()){
      mRequest.cancel();
    }
  }
  
  @Override
  protected void onDetachedFromWindow()
  {
    super.onDetachedFromWindow();
    cancelImageRequest();
  }
  
  
  private class ThumbRequest extends AsyncTask<Void, Void, Bitmap>
  {
    private long mId;
    private int  mKind;
    
    
    public ThumbRequest(long id, int kind)
    {
      mId   = id;
      mKind = kind;
    }
    
    @Override
    protected Bitmap doInBackground(Void... params)
    {
      return Thumbnails.getThumbnail(getContext().getContentResolver(),
        mId, mKind, null);
    }
    
    @Override
    protected void onPostExecute(Bitmap result)
    {
      if(result != null){
        GalleryApp.from(getContext())
          .putImageIntoCache(createCacheKey(mId, mKind), result);
        setImageBitmap(result);
      }
    }

    public void cancel()
    {
      super.cancel(false);
      Thumbnails.cancelThumbnailRequest(
        getContext().getContentResolver()
        , mId);
    }
  }
}

Java Source Code List