Android Open Source - LearningAndroid2edYamba2 Timeline Fragment

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License

The source code is released under:
Apache License
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Java Source Code

package com.marakana.android.yamba;
/*w w w.  j a va  2s . c  o m*/
import android.app.ListFragment;
import android.app.LoaderManager.LoaderCallbacks;
import android.content.CursorLoader;
import android.content.Intent;
import android.content.Loader;
import android.database.Cursor;
import android.os.Bundle;
import android.text.format.DateUtils;
import android.util.Log;
import android.view.View;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
import android.widget.SimpleCursorAdapter.ViewBinder;
import android.widget.TextView;
import android.widget.Toast;

public class TimelineFragment extends ListFragment implements
    LoaderCallbacks<Cursor> {
  private static final String TAG = TimelineFragment.class.getSimpleName();
  private static final String[] FROM = { StatusContract.Column.USER,
      StatusContract.Column.MESSAGE, StatusContract.Column.CREATED_AT,
      StatusContract.Column.CREATED_AT };
  private static final int[] TO = { R.id.list_item_text_user,
      R.id.list_item_text_message, R.id.list_item_text_created_at,
      R.id.list_item_freshness };
  private static final int LOADER_ID = 42;
  private SimpleCursorAdapter mAdapter;

  private static final ViewBinder VIEW_BINDER = new ViewBinder() {

    @Override
    public boolean setViewValue(View view, Cursor cursor, int columnIndex) {
      long timestamp;
      
      // Custom binding
      switch (view.getId()) {
      case R.id.list_item_text_created_at:
        timestamp = cursor.getLong(columnIndex);
        CharSequence relTime = DateUtils
            .getRelativeTimeSpanString(timestamp);
        ((TextView) view).setText(relTime);
        return true;
      case R.id.list_item_freshness:
        timestamp = cursor.getLong(columnIndex);
        ((FreshnessView) view).setTimestamp(timestamp);
        return true;
      default:
        return false;
      }
    }
  };

  @Override
  public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);

    mAdapter = new SimpleCursorAdapter(getActivity(), R.layout.list_item,
        null, FROM, TO, 0);
    mAdapter.setViewBinder(VIEW_BINDER);

    setListAdapter(mAdapter);

    getLoaderManager().initLoader(LOADER_ID, null, this);
  }

  @Override
  public void onListItemClick(ListView l, View v, int position, long id) {

    // Get the details fragment
    DetailsFragment fragment = (DetailsFragment) getFragmentManager()
        .findFragmentById(R.id.fragment_details);

    // Is details fragment visible?
    if (fragment != null && fragment.isVisible()) {
      fragment.updateView(id);
    } else {
      startActivity(new Intent(getActivity(), DetailsActivity.class)
          .putExtra(StatusContract.Column.ID, id));
    }
  }

  // --- Loader Callbacks ---

  // Executed on a non-UI thread
  @Override
  public Loader<Cursor> onCreateLoader(int id, Bundle args) {
    if (id != LOADER_ID)
      return null;
    Log.d(TAG, "onCreateLoader");

    // clk: build with all information for returned CursorLoader to query
    //  the specified ContentResolver in the Uri (and return Cursor)
    return new CursorLoader(getActivity(), StatusContract.CONTENT_URI,
        null, null, null, StatusContract.DEFAULT_SORT);
  }

  @Override
  public void onLoadFinished(Loader<Cursor> loader, Cursor cursor) {
    // Get the details fragment
    DetailsFragment fragment = (DetailsFragment) getFragmentManager()
        .findFragmentById(R.id.fragment_details);

    // Is details fragment visible?
    if (fragment != null && fragment.isVisible() && cursor.getCount() == 0) {
      fragment.updateView(-1);
      Toast.makeText(getActivity(), "No data", Toast.LENGTH_LONG).show();
    }

    Log.d(TAG, "onLoadFinished with cursor: " + cursor.getCount());
    mAdapter.swapCursor(cursor);
    // clk: framework will take care of closing the old cursor once we return
  }

  @Override
  public void onLoaderReset(Loader<Cursor> loader) {
    mAdapter.swapCursor(null); // clk: swap out last cursor so is not used
  }
}
Java Source Code List
