Android Open Source - TimeTabler Load Event

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License

The source code is released under:

Apache License

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Java Source Code

/*
 * Copyright 2013 Ian Kavanagh//from  ww  w .ja va 2  s  . c o  m
 *
 * 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 ie.clashoftheash.timetabler.utils;

import ie.clashoftheash.timetabler.R;
import ie.clashoftheash.timetabler.provider.Timetable;
import ie.clashoftheash.timetabler.provider.TimetableProvider;
import android.app.Activity;
import android.content.ContentUris;
import android.database.Cursor;
import android.net.Uri;
import android.os.AsyncTask;
import android.view.Gravity;

import com.devspark.appmsg.AppMsg;

public class LoadEvent extends AsyncTask<Long, Void, Cursor> {

  /**
   * The callback used to indicate the event has been loaded from the
   * database.
   */
  public interface EventLoadListener {
    public void OnEventLoadFinished(Cursor c);
  }

  private final Activity mActivity;

  public LoadEvent(Activity activity) {
    mActivity = activity;
  }

  @Override
  protected Cursor doInBackground(Long... params) {
    Uri uri = ContentUris.withAppendedId(Timetable.Events.CONTENT_URI,
        params[0]);

    return mActivity.getContentResolver().query(uri,
        TimetableProvider.READ_EVENT_PROJECTION, null, null, null);
  }

  @Override
  protected void onPostExecute(Cursor result) {
    if (result == null || result.getCount() != 1 || !result.moveToFirst()) {
      // Display message to user informing them no event could be found
      AppMsg.makeText(
          mActivity,
          mActivity.getString(R.string.message_error_cant_find_event),
          AppMsg.STYLE_ALERT).setLayoutGravity(Gravity.BOTTOM).show();
      return;
    }
    try {
      ((EventLoadListener) mActivity).OnEventLoadFinished(result);
    } catch (ClassCastException e) {
      throw new ClassCastException(mActivity.getLocalClassName()
          + " must implement EventLoadListener");
    }
  }
}

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