Android Open Source - coursera-android-pos List Story Activity

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The source code is released under:

MIT License

Java Source Code

/*
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 */

package edu.vuum.mocca.ui;

import java.util.ArrayList;

import android.graphics.Color;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.EditText;
import android.widget.ListView;
import edu.vuum.mocca.R;
import edu.vuum.mocca.provider.MoocSchema;
import edu.vuum.mocca.storage.MoocResolver;
import edu.vuum.mocca.storage.StoryData;

/**
 * This activity lists all the stories currently stored in the database
 */
public class ListStoryActivity extends StoryActivityBase {
  
  // A tag used for debugging with Logcat
    private static final String LOG_TAG = ListStoryActivity.class
            .getCanonicalName();
    
    // A resolver that helps us store/retrieve data from the database
  MoocResolver resolver;
  
  // Used as a native container for the stories we retrieve from the database
  ArrayList<StoryData> mStoryData;
  
  // An adapter that lets the ListView correctly display the data in our ArrayList. 
  private StoryDataArrayAdaptor aa;

  // The EditText used to filter the stories listed based on the tags they have
  EditText filterET;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Log.d(LOG_TAG, "onCreate");
        
        // Set up the UI
        setContentView(R.layout.list_story_activity);  // Line 92
        
        // Instantiate the resolver and the ArrayList
        resolver = new MoocResolver(this);
    mStoryData = new ArrayList<StoryData>();
    
    // Get the ListView that will be displayed
    ListView lv = (ListView) findViewById(android.R.id.list);

    filterET = (EditText) findViewById(R.id.story_listview_tags_filter);

    // customize the ListView in whatever desired ways.
    lv.setBackgroundColor(Color.GRAY);  // Line 104
    
    // Instantiate the adapter using our local StoryData ArrayList.
    aa = new StoryDataArrayAdaptor(this,
        R.layout.story_listview_custom_row, mStoryData);  // Line 108

    // Update our StoryData ArrayList with data from the database
    updateStoryData();

    // Tell the ListView which adapter to use to display the data.
    lv.setAdapter(aa);
    
    // Set the click listener for the list view
    lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        public void onItemClick(AdapterView<?> parent, View v, int position, long id){
          Log.d(LOG_TAG, "onListItemClick");
        Log.d(LOG_TAG,
            "position: " + position + "id = "
                + (mStoryData.get(position)).KEY_ID);
        
        // When an item is clicked, open the ViewStoryActivity so the user can view it in full screen
        openViewStoryActivity((mStoryData.get(position)).KEY_ID);
        }
    });
    }

    // When the refresh button is clicked, update our local StoryData ArrayList with data from the database
    public void refreshButtonClicked (View v) {
      updateStoryData();
    }
    
    // When the Create button is clicked, open the CreateStoryActivity
    public void createButtonClicked(View v) {
      openCreateStoryActivity();
    }
    
    // When the Login button is clicked, open the LoginActivity
    public void loginButtonClicked(View v) {
      openLoginActivity();  // Line 142
    }
    
    // Update mStoryData with the data currently in the database using MoocResolver
    public void updateStoryData() {
    Log.d(LOG_TAG, "updateStoryData");
    try {
      // Clear our local cache of StoryData
      mStoryData.clear();

      String filterWord = filterET.getText().toString();  // Line 152

      // create String that will match with 'like' in query
      filterWord = "%" + filterWord + "%";

      // Get all the StoryData in the database
      ArrayList<StoryData> currentList2 = resolver.queryStoryData(null,
          MoocSchema.Story.Cols.TAGS + " LIKE ? ",
          new String[] { filterWord }, null);

      // Add all of them to our local ArrayList
      mStoryData.addAll(currentList2);    // Line 163
      
      // Let the ArrayAdaptor know that we changed the data in its array.
      aa.notifyDataSetChanged();
    } catch (Exception e) {
      Log.e(LOG_TAG,
          "Error connecting to Content Provider" + e.getMessage());
      e.printStackTrace();
    }
  }
}

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