Android Open Source - BookHunter Book Info Activity

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License

The source code is released under:

Apache License

Java Source Code

package com.appspot.brownbookhunter;
/*from   w w w  .  j a v a2  s  .  co m*/
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

import android.app.Activity;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;

public class BookInfoActivity extends Activity {
  private static final String TAG = "BookInfoActivity"; 
  private List<Book> books;
  private Book book;
  private BlockingQueue<Runnable> _workQueue = new LinkedBlockingQueue<Runnable>();
  private ExecutorService _executor = new ThreadPoolExecutor(10, 10, 1000l, TimeUnit.SECONDS, _workQueue);
  private Future<List<Book>> _recFuture = null;
  private Book _nextBook = null;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
    setContentView(R.layout.activity_book_info);
    Bundle data = getIntent().getExtras();
    book = data.getParcelable("info");
    books = data.getParcelableArrayList("recs");
    Log.d(TAG, "book is " + book.getTitle() + " by " + book.getAuthor());
    Log.d(TAG, "received recs: " + books.size());
    
    populateTextFields();
    displayRecs();
    startWatcherThread();
  }

  @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;
  }
  
  private void populateTextFields() {
    TextView title = (TextView) findViewById(R.id.title);
    TextView author = (TextView) findViewById(R.id.author);
    TextView info = (TextView) findViewById(R.id.cite_info);
    TextView call = (TextView) findViewById(R.id.call_no);
    
    title.setText(book.getTitle());
    author.setText(book.getAuthor());
    info.setText(book.getPublisherPlace() + " " + book.getPublisher() + " " + book.getYear()) ;
    call.setText(book.getCallNumber());
  }
  
  private void displayRecs() {
    TextView first = (TextView) findViewById(R.id.rec1);
    TextView second = (TextView) findViewById(R.id.rec2);
    TextView third = (TextView) findViewById(R.id.rec3);
    
    int len = books.size();
    //should factor this and DRY but...
    if (len >= 1) {
      first.setText(books.get(0).getTitle());
      //button
    }
    else findViewById(R.id.rec1layout).setVisibility(View.INVISIBLE);
    if (len >= 2) {
      second.setText(books.get(1).getTitle());
    }
    else findViewById(R.id.rec2layout).setVisibility(View.INVISIBLE);
    if (len >= 3) {
      third.setText(books.get(2).getTitle());
    }
    else findViewById(R.id.rec3layout).setVisibility(View.INVISIBLE);
    
  }
  
  public void email(View v){
    Log.d(TAG, "emailing citation info");
    String citation = book.getAuthor() + ". " + book.getTitle() + ". " + book.getPublisherPlace() + " " + book.getPublisher() + " " + book.getYear();
    
    Intent i = new Intent(Intent.ACTION_SEND);
    i.setType("message/rfc822");
    i.putExtra(Intent.EXTRA_EMAIL  , new String[]{"michael_rowland+bookhunter@brown.edu"});
    i.putExtra(Intent.EXTRA_SUBJECT, "Citation for " + book.getTitle());
    i.putExtra(Intent.EXTRA_TEXT   , citation);
    try {
        startActivity(Intent.createChooser(i, "Send citation..."));
    } catch (android.content.ActivityNotFoundException ex) {
        Toast.makeText(BookInfoActivity.this, "There are no email clients installed.", Toast.LENGTH_SHORT).show();
    }
  }
  
  public void newInfo1(View v) {
    _nextBook = books.get(0);
    _recFuture = _executor.submit(new RecTask(_nextBook.getBarcode()));
    
  }
  
  public void newInfo2(View v) {
    _nextBook = books.get(1);
    _recFuture = _executor.submit(new RecTask(_nextBook.getBarcode()));
    
  }
  
  public void newInfo3(View v) {
    _nextBook = books.get(2);
    _recFuture = _executor.submit(new RecTask(_nextBook.getBarcode()));    
  }
  
  private void startWatcherThread() {
    new Thread(new Runnable() {

      @Override
      public void run() {
        checkFutureResults();
      }
    }).start();
  }

  protected void checkFutureResults() {
    while (true){
      //wait until both rec and info are present to continue to presentation page
      if (_recFuture != null && _recFuture.isDone() && _nextBook != null){
        ArrayList<Book> recList;
        try {
          recList = (ArrayList<Book>) _recFuture.get();
          
          Log.d(TAG, "Rec is done: there are " + recList.size() + " recommendations for " + _nextBook.getTitle());
          List<Book> toDelete = new ArrayList<Book>();
          for (Book b: recList) {
            Log.d(TAG, "title is "+ b.getTitle());
            if (b.getTitle().equals(_nextBook.getTitle())){
               Log.d(TAG, "trying to remove " + _nextBook.getTitle());
               toDelete.add(b);
             }
          }
          for (Book b: toDelete) {
            recList.remove(b);
          }
           Log.d(TAG, "after removal, there are now " + recList.size() + " recommendations");
          
          //start new book info page 
          Intent i = new Intent(getBaseContext(), BookInfoActivity.class);
          i.putExtra("info", _nextBook);
          i.putParcelableArrayListExtra("recs", recList);
          startActivity(i);
          
        } catch (InterruptedException e) {
          Log.e(TAG, "rec future interrupted: " + e.getMessage());
        } catch (ExecutionException e) {
          Log.e(TAG, "rec future execution exception: " + e.getMessage());
        }
        _recFuture = null;
        _nextBook = null;
        
      }
      Thread.yield(); //noop to keep thread alive... #cs32lifelessons
    }
    
  }
  
  public void scanAgain(View v) {
    Intent i = new Intent(getBaseContext(), MainActivity.class);
    startActivity(i);
  }
  
}

Java Source Code List

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