Android Open Source - ScienceQuiz Main Activity

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License

The source code is released under:

GNU General Public License

Java Source Code

package com.finger.sciencequiz;
/* ww w . j  a v a  2  s  . c om*/
import com.finger.sciencequiz.R;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.support.v4.util.LruCache;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity
{

    /**
     * The {@link android.support.v4.view.PagerAdapter} that will provide
     * fragments for each of the sections. 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}.
     */
    PagerAdapter                     mHomePagerAdapter;

    /**
     * The {@link ViewPager} that will host the section contents.
     */
    ViewPager                        mViewPager;

    private LruCache<String, Bitmap> mMemoryCache;

    @Override
    protected void onCreate (Bundle savedInstanceState)
    {
  super.onCreate (savedInstanceState);
  setContentView (R.layout.activity_main);

  // Create the adapter that will return a fragment for each of the three
  // primary sections of the app.
  mHomePagerAdapter = new HomePagerAdapter (getSupportFragmentManager (),
      this);

  // Set up the ViewPager with the sections adapter.
  mViewPager = (ViewPager) findViewById (R.id.pager);
  mViewPager.setAdapter (mHomePagerAdapter);
  mViewPager.setCurrentItem (1);

  // Get max available VM memory, exceeding this amount will throw an
  // OutOfMemory exception. Stored in kilobytes as LruCache takes an
  // int in its constructor.
  final int maxMemory = (int) (Runtime.getRuntime ().maxMemory () / 1024);

  // Use 1/8th of the available memory for this memory cache.
  final int cacheSize = maxMemory / 8;

  mMemoryCache = new LruCache<String, Bitmap> (cacheSize)
  {
      @Override
      protected int sizeOf (String key, Bitmap bitmap)
      {
    // The cache size will be measured in kilobytes rather than
    // number of items.
    return bitmap.getRowBytes () * bitmap.getHeight () / 1024;
      }
  };
    }

    @Override
    public boolean onCreateOptionsMenu (Menu menu)
    {
  // Inflate the menu; this adds items to the action bar if it is present.
  getMenuInflater ().inflate (R.menu.main, menu);
  return true;
    }

    @Override
    public boolean onOptionsItemSelected (MenuItem item)
    {
  // Handle action bar item clicks here. The action bar will
  // automatically handle clicks on the Home/Up button, so long
  // as you specify a parent activity in AndroidManifest.xml.
  int id = item.getItemId ();
  switch (id)
  {
  case R.id.Action_Refresh:
      refresh (null);
      return true;
  case R.id.Action_NewGame:
      viewNewGame (null);
      return true;
  case R.id.Action_History:
      viewHistory (null);
      return true;
  case R.id.Action_Settings:
      viewSettings (null);
      return true;
  case R.id.Action_About:
      viewAbout (null);
      return true;
  }
  return super.onOptionsItemSelected (item);
    }

    public void addBitmapToMemoryCache (String key, Bitmap bitmap)
    {
  synchronized (mMemoryCache)
  {
      if (getBitmapFromMemCache (key) == null)
      {
    mMemoryCache.put (key, bitmap);
      }
  }
    }

    public Bitmap getBitmapFromMemCache (String key)
    {
  return mMemoryCache.get (key);
    }

    public void viewRunningGames (View view)
    {
  mViewPager.setCurrentItem (0);
    }

    public void viewFriends (View view)
    {
  mViewPager.setCurrentItem (2);
    }

    public void viewProfile (View view)
    {
  mViewPager.setCurrentItem (3);
    }

    public void viewNewGame (View view)
    {
  Intent intent = new Intent (this, NewGameActivity.class);
  startActivity (intent);
    }
    
    public void viewHistory (View view)
    {
  Intent intent = new Intent (this, HistoryActivity.class);
  startActivity (intent);
    }
    
    public void viewSettings (View view)
    {
  Intent intent = new Intent (this, SettingsActivity.class);
  startActivity (intent);
    }
    
    public void viewAbout (View view)
    {
  Intent intent = new Intent (this, AboutActivity.class);
  startActivity (intent);
    }
    
    public void refresh (View view)
    {
  Toast.makeText (
      this, getResources ().getString (R.string.refreshing),
      Toast.LENGTH_LONG).show ();
    }
}

Java Source Code List

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