Android Open Source - Munin-for-Android Grid Download Helper

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License

The source code is released under:

GNU General Public License

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Java Source Code

package com.chteuchteu.munin.hlpr;
/*  w w  w  . j a v  a2s  .  c o m*/
import android.graphics.Bitmap;
import android.os.AsyncTask;
import android.view.View;

import com.chteuchteu.munin.MuninFoo;
import com.chteuchteu.munin.obj.Grid;
import com.chteuchteu.munin.obj.GridItem;
import com.chteuchteu.munin.obj.MuninPlugin.Period;
import com.chteuchteu.munin.ui.Activity_Grid;

import java.util.List;

public class GridDownloadHelper {
  private Grid g;
  
  private int nbSimultaneousDownloads = 3;
  public Period period = Period.DAY;
  
  private List<GridItem> items;
  
  public GridDownloadHelper(Grid g) {
    this.g = g;
  }
  
  public void init(int nbSimultaneousDownloads, Period p) {
    this.nbSimultaneousDownloads = nbSimultaneousDownloads;
    this.period = p;
    items = g.items;
  }
  
  public void start(boolean forceUpdate) {
    for (GridItem i : items)
      i.pb.setVisibility(View.VISIBLE);
    
    onStart();
    
    for (int i=0; i<this.nbSimultaneousDownloads; i++) {
      if (items.size() > i)
        new DownloadBitmaps(i, forceUpdate).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
    }
  }
  
  private void onStart() {
    Activity_Grid.updating = true;
  }
  
  private void onStop() {
    Activity_Grid.updating = false;
  }
  
  private class DownloadBitmaps extends AsyncTask<Void, Integer, Void> {
    private int i;
    private boolean forceUpdate;
    private Bitmap b;
    
    private DownloadBitmaps(int i, boolean forceUpdate) {
      this.i = i;
      this.forceUpdate = forceUpdate;
    }
    
    @Override
    protected Void doInBackground(Void... arg0) {
      if (i < g.items.size()) {
        GridItem gridItem = items.get(i);
        if (forceUpdate || gridItem.iv.getDrawable() == null) {
          if (gridItem != null && gridItem.plugin != null && gridItem.plugin.getInstalledOn() != null
              && gridItem.plugin.getInstalledOn().getParent() != null) {
            String graphUrl = gridItem.plugin.getImgUrl(period);
            b = Util.dropShadow(
                Util.removeBitmapBorder(
                    gridItem.plugin.getInstalledOn().getParent().grabBitmap(graphUrl,
                        MuninFoo.getInstance().getUserAgent()).getBitmap()));
          }
        }
      }
      return null;
    }
    
    @Override
    protected void onPostExecute(Void result) {
      if (i == g.items.size() - 1)
        onStop();
      if (i < g.items.size()) {
        if (items.get(i) != null) {
          if (b != null) {
            items.get(i).iv.setImageBitmap(b);
            items.get(i).graph = b;
          }
          items.get(i).pb.setVisibility(View.GONE);
        }
        
        int next = i + nbSimultaneousDownloads;
        if (next < items.size())
          new DownloadBitmaps(next, forceUpdate).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
      }
    }
  }
}

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