Android Open Source - RecipeBook Recipe Detail Activity

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License

The source code is released under:
Copyright (c) 2013, Ian Lake All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: - Red...
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Java Source Code

package com.ianhanniballake.recipebook.ui;
/*from w w w .  jav a2  s  .c  o m*/
import java.util.Locale;

import android.app.ActionBar;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentTransaction;
import android.content.AsyncQueryHandler;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.support.v13.app.FragmentPagerAdapter;
import android.support.v4.app.NavUtils;
import android.support.v4.view.ViewPager;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;

import com.ianhanniballake.recipebook.R;
import com.ianhanniballake.recipebook.auth.AuthorizedActivity;
import com.ianhanniballake.recipebook.provider.RecipeContract;

/**
 * An activity representing a single Recipe detail screen. This activity is only used on handset devices. On tablet-size
 * devices, item details are presented side-by-side with a list of items in a {@link RecipeListActivity}.
 */
public class RecipeDetailActivity extends AuthorizedActivity
{
  /**
   * A {@link FragmentPagerAdapter} that returns a fragment corresponding to one of the sections/tabs/pages. We use a
   * {@link android.support.v4.app.FragmentPagerAdapter} derivative, which will keep every loaded fragment in memory.
   * If this becomes too memory intensive, it may be best to switch to a
   * {@link android.support.v4.app.FragmentStatePagerAdapter}.
   */
  public static class RecipeDetailTabsAdapter extends FragmentPagerAdapter implements ActionBar.TabListener,
      ViewPager.OnPageChangeListener
  {
    private final ActionBar actionBar;
    private final Context context;
    private final ViewPager pager;

    /**
     * Manages the set of static tabs
     * 
     * @param activity
     *            Activity showing these swipeable tabs
     * @param pager
     *            Pager displaying the tabs
     */
    public RecipeDetailTabsAdapter(final Activity activity, final ViewPager pager)
    {
      super(activity.getFragmentManager());
      context = activity;
      actionBar = activity.getActionBar();
      this.pager = pager;
    }

    @Override
    public int getCount()
    {
      // Show 3 total pages.
      return 3;
    }

    @Override
    public Fragment getItem(final int position)
    {
      switch (position)
      {
        case 0:
          return new RecipeDetailSummaryFragment();
        case 1:
          return new RecipeDetailIngredientFragment();
        case 2:
          return new RecipeDetailInstructionFragment();
        default:
          return null;
      }
    }

    @Override
    public CharSequence getPageTitle(final int position)
    {
      final Locale l = Locale.getDefault();
      switch (position)
      {
        case 0:
          return context.getString(R.string.title_summary).toUpperCase(l);
        case 1:
          return context.getString(R.string.title_ingredient_list).toUpperCase(l);
        case 2:
          return context.getString(R.string.title_instruction_list).toUpperCase(l);
        default:
          return null;
      }
    }

    @Override
    public void onPageScrolled(final int position, final float positionOffset, final int positionOffsetPixels)
    {
      // Nothing to do
    }

    @Override
    public void onPageScrollStateChanged(final int state)
    {
      // Nothing to do
    }

    @Override
    public void onPageSelected(final int position)
    {
      actionBar.setSelectedNavigationItem(position);
    }

    @Override
    public void onTabReselected(final ActionBar.Tab tab, final FragmentTransaction fragmentTransaction)
    {
      // Nothing to do
    }

    @Override
    public void onTabSelected(final ActionBar.Tab tab, final FragmentTransaction fragmentTransaction)
    {
      // When the given tab is selected, switch to the corresponding page in the ViewPager.
      pager.setCurrentItem(tab.getPosition());
    }

    @Override
    public void onTabUnselected(final ActionBar.Tab tab, final FragmentTransaction fragmentTransaction)
    {
      // Nothing to do
    }

    /**
     * Ties the pager and tabs together
     */
    public void setup()
    {
      pager.setAdapter(this);
      pager.setOnPageChangeListener(this);
      actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
      // For each of the sections in the app, add a tab to the action bar.
      for (int i = 0; i < getCount(); i++)
        actionBar.addTab(actionBar.newTab().setText(getPageTitle(i)).setTabListener(this));
    }
  }

  private AsyncQueryHandler recipeDeleteHandler;

  @Override
  protected void onCreate(final Bundle savedInstanceState)
  {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_recipe_detail);
    // Query for the recipe's title
    new AsyncQueryHandler(getContentResolver())
    {
      @Override
      protected void onQueryComplete(final int token, final Object cookie, final Cursor cursor)
      {
        if (cursor.moveToFirst())
        {
          final int titleColumnIndex = cursor.getColumnIndex(RecipeContract.Recipes.COLUMN_NAME_TITLE);
          setTitle(cursor.getString(titleColumnIndex));
        }
      }
    }.startQuery(0, 0, getIntent().getData(), new String[] { RecipeContract.Recipes.COLUMN_NAME_TITLE }, null,
        null, null);
    // Show the Up button in the action bar.
    getActionBar().setDisplayHomeAsUpEnabled(true);
    final ViewPager pager = (ViewPager) findViewById(R.id.pager);
    // Create the adapter that will return a fragment for each of the three tabs
    final RecipeDetailTabsAdapter tabsAdapter = new RecipeDetailTabsAdapter(this, pager);
    tabsAdapter.setup();
    recipeDeleteHandler = new AsyncQueryHandler(getContentResolver())
    {
      @Override
      protected void onDeleteComplete(final int token, final Object cookie, final int result)
      {
        Toast.makeText(RecipeDetailActivity.this, R.string.deleted, Toast.LENGTH_SHORT).show();
        finish();
      }
    };
  }

  @Override
  public boolean onCreateOptionsMenu(final Menu menu)
  {
    super.onCreateOptionsMenu(menu);
    getMenuInflater().inflate(R.menu.recipe_detail, menu);
    return true;
  }

  @Override
  public boolean onOptionsItemSelected(final MenuItem item)
  {
    switch (item.getItemId())
    {
      case android.R.id.home:
        // This ID represents the Home or Up button. In the case of this activity, the Up button is shown. Use
        // NavUtils to allow users to navigate up one level in the application structure.
        NavUtils.navigateUpTo(this, new Intent(this, RecipeListActivity.class));
        return true;
      case R.id.edit:
        final Intent editIntent = new Intent(Intent.ACTION_EDIT, getIntent().getData());
        startActivity(editIntent);
        return true;
      case R.id.delete:
        recipeDeleteHandler.startDelete(0, null, getIntent().getData(), null, null);
        return true;
      default:
        return super.onOptionsItemSelected(item);
    }
  }
}
Java Source Code List
