Android Open Source - androidTileMapEditor My Simple Cursor Adapter

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright (C) 2012 Luca Santarelli/*w  ww.jav  a2 s  .c  om*/
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package it.sineo.android.tileMapEditor;

import java.io.File;
import java.text.SimpleDateFormat;
import java.util.HashMap;
import java.util.Map;

import android.content.Context;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.support.v4.widget.SimpleCursorAdapter;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

public class MySimpleCursorAdapter extends SimpleCursorAdapter {

  private final static String TAG = MySimpleCursorAdapter.class.getSimpleName();

  public MySimpleCursorAdapter(Context context, int layout, Cursor c, String[] from, int[] to, int flags) {
    super(context, layout, c, from, to, flags);
    this.ctx = context;
  }

  private SimpleDateFormat sdfLastUpdate = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

  private Context ctx;
  private LayoutInflater inflater;
  private Map<Long /* id */, Drawable /* thumbnail */> cache = new HashMap<Long, Drawable>();
  private Map<Long /* id */, Long /* lastUpdate */> cacheValidity = new HashMap<Long, Long>();

  private static class ViewHolder {
    TextView tvName, tvDate;
    ImageView ivThumb;
  }

  public View getView(int position, View convertView, ViewGroup parent) {
    if (convertView == null) {
      if (inflater == null) {
        inflater = LayoutInflater.from(ctx);
      }
      convertView = inflater.inflate(R.layout.home_grid_item, null);
    }
    ViewHolder tag = (ViewHolder) convertView.getTag();
    if (tag == null) {
      tag = new ViewHolder();
      tag.tvName = (TextView) convertView.findViewById(R.id.home_grid_item_name);
      tag.tvDate = (TextView) convertView.findViewById(R.id.home_grid_item_date);
      tag.ivThumb = (ImageView) convertView.findViewById(R.id.home_grid_item_thumb);
      convertView.setTag(tag);
    }

    getCursor().moveToPosition(position);

    long id = getCursor().getLong(0);
    String name = getCursor().getString(1);
    long lastUpdate = getCursor().getLong(3);

    tag.tvName.setText(name);
    tag.tvDate.setText(sdfLastUpdate.format(lastUpdate));

    Drawable thumb;
    if (!cache.containsKey(id) || cacheValidity.get(id) < lastUpdate) {
      /* Not loaded yet, or changed after being cached: load it again */
      try {
        File thumbFile = new File(Util.getExternalThumbnailsDirectory(), "tn_" + id + ".png");
        if (!thumbFile.exists()) {
          thumb = ctx.getResources().getDrawable(R.drawable.not_found);
        } else {
          Bitmap bmp = BitmapFactory.decodeFile(thumbFile.getAbsolutePath());
          if (bmp != null) {
            thumb = new BitmapDrawable(ctx.getResources(), bmp);
          } else {
            thumb = ctx.getResources().getDrawable(R.drawable.not_found);
          }
        }
      } catch (Exception ex) {
        ex.printStackTrace();
        Log.e(TAG, "exception loading thumb: " + ex.getMessage());
        thumb = ctx.getResources().getDrawable(R.drawable.not_found);
      }
      cache.put(id, thumb);
      cacheValidity.put(id, lastUpdate);
    } else {
      /* In the cache and valid */
      thumb = cache.get(id);
    }
    tag.ivThumb.setImageDrawable(thumb);

    return convertView;
  }
}

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