Android Open Source - RssReader Edit Channel Activity

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License

The source code is released under:
GNU General Public License
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Java Source Code

/**
 * RssReader//w  w w .  j a v  a2 s.  co m
 *
 * Copyright (c) 2013-2014 teejoe
 *
 *     This program is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     (at your option) any later version.
 *
 *     This program is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *     GNU General Public License for more details.
 *
 *     You should have received a copy of the GNU General Public License
 *     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.m2x.rssreader.activity;

import org.m2x.rssreader.MainApplication;
import org.m2x.rssreader.R;
import org.m2x.rssreader.provider.FeedData.FeedColumns;
import org.m2x.rssreader.util.UiUtils;

import android.content.ContentValues;
import android.database.Cursor;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;

import com.actionbarsherlock.app.SherlockActivity;
import com.actionbarsherlock.view.MenuItem;

/**
 * The Activity to edit a RSS channel.
 * @author teejoe(mtjm2x@gmail.com)
 *
 */
public class EditChannelActivity extends SherlockActivity implements
    View.OnClickListener {
  
  public static final String EXTRA_FEED_ID = "feed_id";
  
  private static long INVALID_FEED_ID = -1;
  
  private long mFeedId;
  
  private EditText mFeedName;
  private EditText mFeedUrl;
  
  private Cursor mCursor;
  
  private boolean mHasInit = false;  // Is the content of EditText has been initialized. 
  
  @Override
  public void onCreate(Bundle savedInstanceState){
    UiUtils.setPreferenceTheme(this);
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_edit_channel);
    
    mFeedId = getIntent().getLongExtra(EXTRA_FEED_ID, INVALID_FEED_ID);
    
    mFeedName = (EditText) findViewById(R.id.edit_feed_title);
    mFeedUrl = (EditText) findViewById(R.id.edit_feed_url);
    
    findViewById(R.id.btn_ok).setOnClickListener(this);
    findViewById(R.id.btn_cancel).setOnClickListener(this);
    
    initTitleAndUrl();
    
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
  }
  
  @Override
  public boolean onOptionsItemSelected(MenuItem menuItem) {
      switch (menuItem.getItemId()) {
      case android.R.id.home:
        finish();
        return true;
      }
      
      return (super.onOptionsItemSelected(menuItem));
  }

  @Override
  public void onClick(View v) {
    switch (v.getId()) {
    case R.id.btn_ok:
      updateFeedData();
      finish();
      break;
    case R.id.btn_cancel:
      finish();
      break;
    default:
      break;
    }
  }
  
  /** Initialize the feed title and URL and apply to the EditText. */
  private void initTitleAndUrl() {
    if (mFeedId == INVALID_FEED_ID)  return;
    
    new AsyncTask<Void, Void, Void> () {

      @Override
      protected Void doInBackground(Void... params) {
        mCursor = MainApplication.getContext().getContentResolver().query(
            FeedColumns.CONTENT_URI(mFeedId), null, null, null, null);
        return null;
      }
      
      @Override
      protected void onPostExecute(Void result) {
        if (mCursor != null && mCursor.moveToFirst()) {
          mFeedName.setText(mCursor.getString(mCursor.getColumnIndex(FeedColumns.NAME)));
          mFeedUrl.setText(mCursor.getString(mCursor.getColumnIndex(FeedColumns.URL)));
          mHasInit = true;
        }
      }
    }.execute();
  }
  
  /** Update the feed data. */
  private void updateFeedData() {
    if (mFeedId == INVALID_FEED_ID || !mHasInit) return;
    
    new Thread() {
      @Override
      public void run() {
        ContentValues values = new ContentValues();
        values.put(FeedColumns.NAME, mFeedName.getText().toString());
        values.put(FeedColumns.URL, mFeedUrl.getText().toString());
        
        MainApplication.getContext().getContentResolver().update(
            FeedColumns.CONTENT_URI(mFeedId), values, null, null);
      }
      
    }.start();
  }
}
Java Source Code List
