Android Open Source - FileManager Video Preview

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License

The source code is released under:

GNU General Public License

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Java Source Code

package com.ankur.coreutils;
// ww w  .  ja v a  2  s .  c  o m
import java.io.File;
import java.util.Collections;

import java.util.Map;

import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import android.graphics.Bitmap;
import android.media.ThumbnailUtils;
import android.os.Handler;
import android.os.Message;
import android.provider.MediaStore;

import android.util.Log;
import android.widget.ImageView;

public enum VideoPreview {
  INSTANCE;

  private final ConcurrentMap<String, Bitmap> cache;
  private final ExecutorService pool;
  private Map<ImageView, String> imageViews = Collections
      .synchronizedMap(new ConcurrentHashMap<ImageView, String>());
  private Bitmap placeholder;

  VideoPreview() {
    cache = new ConcurrentHashMap<String, Bitmap>();
    pool = Executors.newFixedThreadPool(5);
  }

  public void setPlaceholder(Bitmap bmp) {
    placeholder = bmp;
  }

  public Bitmap getBitmapFromCache(String url) {
    if (cache.containsKey(url)) {
      return cache.get(url);
    }

    return null;
  }

  public void queueJob(final String url, final ImageView imageView) {
    /* Create handler in UI thread. */
    final Handler handler = new Handler() {
      @Override
      public void handleMessage(Message msg) {
        String tag = imageViews.get(imageView);
        if (tag != null && tag.equals(url)) {
          if (msg.obj != null) {
            imageView.setImageBitmap((Bitmap) msg.obj);
          } else {
            imageView.setImageBitmap(placeholder);
            Log.d(null, "fail " + url);
          }
        }
      }
    };

    pool.submit(new Runnable() {
      public void run() {
        final Bitmap bmp = getPreview(url);
        Message message = Message.obtain();
        message.obj = bmp;
        Log.d(null, "Item downloaded: " + url);

        handler.sendMessage(message);
      }
    });
  }

  public void loadBitmap(final String url, final ImageView imageView) {
    imageViews.put(imageView, url);
    Bitmap bitmap = getBitmapFromCache(url);

    // check in UI thread, so no concurrency issues
    if (bitmap != null) {
      Log.d(null, "Item loaded from cache: " + url);
      imageView.setImageBitmap(bitmap);
    } else {
      imageView.setImageBitmap(placeholder);
      queueJob(url, imageView);
    }
  }

  public void clearCache() {
    cache.clear();
  }

  private Bitmap getPreview(String url) {
    File path = new File(url);
    Bitmap mBitmap = null;

    mBitmap = ThumbnailUtils.createVideoThumbnail(path.getAbsolutePath(),
        MediaStore.Images.Thumbnails.MINI_KIND);

    cache.put(url, mBitmap);

    return mBitmap;
  }
}

Java Source Code List