Android Open Source - android-autostarts Load Task

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License

The source code is released under:

GNU General Public License

Java Source Code

package com.elsdoerfer.android.autostarts;
//  ww  w. ja v a 2s .  c  o m
import java.util.ArrayList;

import android.os.AsyncTask;
import android.os.SystemClock;
import android.util.Log;
import com.elsdoerfer.android.autostarts.ReceiverReader.OnLoadProgressListener;
import com.elsdoerfer.android.autostarts.db.IntentFilterInfo;


// TODO: We could speed this up (probably not too much) by returning
// only the newly found apps during progress report. I don't think
// the list itself cares when notifyDatasetChanged() is called, but
// at least we don't need to re-filter the whole list on every progress
// report, but can only apply the filter to what comes in new.
class LoadTask extends AsyncTask<Object, Object, ArrayList<IntentFilterInfo>> {

  ListActivity mListActivity = null;
  Integer mCurrentProgress = 0;
  long timeStarted, lastUIUpdate;

  public LoadTask(ListActivity initialConnect) {
    attach(initialConnect);
  }

  public void attach(ListActivity activity) {
    mListActivity = activity;
  }

  @Override
  protected void onPreExecute() {
    super.onPreExecute();
    // Note that we have the current progress remembered (there is
    // no getProgress() apparently), and we need it so that when a
    // new Activity connects after an orientation change, we can
    // display the current progress right away, rather than it taking
    // the time until the next publishProgress() call before we update
    // the progress bar.
    mListActivity.setProgress(mCurrentProgress);
    mListActivity.setProgressBarVisibility(true);
    if (mListActivity.mReloadItem != null)
      mListActivity.mReloadItem.setEnabled(false);
    mListActivity.updateEmptyText();
    timeStarted = lastUIUpdate = SystemClock.elapsedRealtime();
  }

  @Override
  protected ArrayList<IntentFilterInfo> doInBackground(Object... params) {
    ReceiverReader reader = new ReceiverReader(mListActivity, new OnLoadProgressListener() {
      @Override
      public void onProgress(ArrayList<IntentFilterInfo> currentState, float progress) {
        publishProgress(currentState, progress);
      }
    });
    return reader.load();
  }

  @Override
  protected void onPostExecute(ArrayList<IntentFilterInfo> result) {
    // This should not happen, but I have seen it happen.
    // TODO: Get rid of this activity-bound task entirely, try to find a more
    // modern approach.
    if (mListActivity == null)
      return;

    mListActivity.mEvents = result;
    mListActivity.apply();

    mListActivity.setProgressBarVisibility(false);
    if (mListActivity.mReloadItem != null)
      mListActivity.mReloadItem.setEnabled(true);
    mListActivity.updateEmptyText(true);
    Log.d(Utils.TAG, "Loading receivers took " +(SystemClock.elapsedRealtime() - timeStarted));
  }

  @SuppressWarnings("unchecked")
  @Override
  protected void onProgressUpdate(Object... values) {
    super.onProgressUpdate(values);
    if (mListActivity != null) {
      // Updating the UI takes a long time and hugely slows down the UI
      // (to the tune of 30s vs 2s). If loading takes too long, we still
      // want to update once in a while though.
      //
      // Here are my measurements regarding this: (in ms)
      //
      // (not updating the list at all)
      //    6270 2003 1725 1749        (after reinstall)
      //    2952 1917                  (after restart)
      //    2978                       (after reinstall)
      //
      // (updating after every new receiver found)
      //    27395 25893 25828
      //
      // (updating the list every second)
      //    2919 1685

      if (SystemClock.elapsedRealtime() - lastUIUpdate > 2000) {
        mListActivity.mEvents = (ArrayList<IntentFilterInfo>)values[0];
        mListActivity.apply();
        lastUIUpdate = SystemClock.elapsedRealtime();
      }
      mCurrentProgress = (int)(((Float)values[1])*10000);
      mListActivity.setProgress(mCurrentProgress);
    }
  }
}

Java Source Code List

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