Android Open Source - BookHunter Main Activity

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Back to project page BookHunter.

License

The source code is released under:

Apache License

Java Source Code

package com.appspot.brownbookhunter;
//from   ww  w  . j ava  2  s.  c o m
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.Callable;
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.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.util.Log;
import android.view.Menu;
import android.view.View;

import org.json.*;

import com.google.zxing.IntentIntegrator;
import com.google.zxing.IntentResult;


public class MainActivity extends Activity {

  private static final String TAG = "MainActivity";
  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 Future<Book> _infoFuture = null;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    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;
  }
  
  public void scan(View v) {
    Log.d(TAG, "Scanning");
    IntentIntegrator integrator = new IntentIntegrator(this);
    integrator.initiateScan();
  }
  
  public void getRecs(View v) {
    Log.d(TAG, "Getting recs");
    //Callable<List<Book>> getRecTask = new RecTask("BH39 .S322 1999");
    Callable<List<Book>> getRecTask = new RecTask("31236009770234");
    _recFuture = _executor.submit(getRecTask);
  }
  
  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() && _infoFuture != null && _infoFuture.isDone()){
        Book info;
        ArrayList<Book> recList;
        try {
          info = _infoFuture.get();
          recList = (ArrayList<Book>) _recFuture.get();
          
          Log.d(TAG, "Rec is done: there are " + recList.size() + " recommendations");
          
          //start new book info page 
          Intent i = new Intent(getBaseContext(), BookInfoActivity.class);
          i.putExtra("info", info);
          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;
        _infoFuture = null;
        
      }
      
      Thread.yield(); //noop to keep thread alive... #cs32lifelessons
    }
    
  }
  
  //submit scanning result to rec page
  public void onActivityResult(int requestCode, int resultCode, Intent intent) {
      IntentResult scanResult = IntentIntegrator.parseActivityResult(requestCode, resultCode, intent);
      if (scanResult != null) {
        String barcode = scanResult.getContents();
        Log.d(TAG, "Scan result was: " + barcode);
        Callable<List<Book>> getRecTask = new RecTask(barcode);
        _recFuture = _executor.submit(getRecTask);
        Callable<Book> getInfoTask = new InfoTask(barcode);
        _infoFuture = _executor.submit(getInfoTask);
      }
    }

}

Java Source Code List

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