Android Open Source - StreamHub-Android-Reviews-App Thumbnail View

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License

The source code is released under:

MIT License

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Java Source Code

package com.filepicker.sdk;
// w w  w .j  a va2  s.  c o m
import java.util.concurrent.RejectedExecutionException;

import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Color;
import android.os.AsyncTask;


public class ThumbnailView extends android.widget.ImageView {
  private final String url;
  private final Inode inode;
  private ThumbnailLoaderTask task = null;
  private int width;

  class ThumbnailLoaderTask extends
      AsyncTask<Void, Integer, Bitmap> {

    @Override
    protected Bitmap doInBackground(Void... arg0) {
      if (inode.getThumbnailBitmap() != null)
        return inode.getThumbnailBitmap();
      Bitmap bitmap = FilePickerAPI.getInstance().getThumbnail(url);
      int MAXSIZE = width;
      if (bitmap != null && (bitmap.getHeight() > MAXSIZE || bitmap.getWidth() > MAXSIZE)) {
        //scale
        int h = bitmap.getHeight();
        int w = bitmap.getWidth();
        h = h * Math.min(w, MAXSIZE) / w;
        w = Math.min(w, MAXSIZE);
        w = w * Math.min(h, MAXSIZE) / h;
        h = Math.min(h, MAXSIZE);
        return Bitmap.createScaledBitmap(bitmap, w, h, true);
      } else {
        return bitmap;
      }
    }
    
    @Override
    protected void onPostExecute(Bitmap result) {
      if (result != null) {
        ThumbnailView.this.setImageBitmap(result);
        ThumbnailView.this.requestLayout();
        if (inode.getThumbnailBitmap() == null)
          inode.setThumbnailBitmap(result);
      }
      task = null;
    }

  }
  
  @SuppressLint("NewApi")
  public ThumbnailView(Context context, Inode inode) {
    super(context);
    setBackgroundColor(Color.GRAY);
    width = context.getResources().getDisplayMetrics().widthPixels / 3;
    setMinimumHeight(width);
    setMinimumWidth(width);
    setScaleType(ScaleType.CENTER_CROP);
    this.url = inode.getThumbnail();
    this.inode = inode;
    if (inode.getThumbnailBitmap() != null) {
      setImageBitmap(inode.getThumbnailBitmap());
      requestLayout();
    } else {
      int SDK_INT = android.os.Build.VERSION.SDK_INT;
      task = new ThumbnailLoaderTask();
      if (SDK_INT >= 12) {
        try {
          task.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
        } catch (RejectedExecutionException e) {
          //task.execute();
        }
      } else {
        task.execute();
      }
    }
  }
  
  @Override
  public void onDetachedFromWindow() {
    if (task != null)
      task.cancel(true);
  }

}

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