Android Open Source - As1-301-CounterApp Counter Activity

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Back to project page As1-301-CounterApp.

License

The source code is released under:

GNU General Public License

Java Source Code

package pack.as1_301;
/*  w w w  .  j  a v  a  2s  .c om*/
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;

import com.google.gson.Gson;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

public class CounterActivity extends Activity {
  private static final String FILENAME = "midday.sav";
  private ArrayList<Counter> counters;
  private Counter currentCounter;
  private TextView myIncTextView;
  private TextView myNameTextView;
  
  // sets up the class for use
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.counter);
    Intent intent = getIntent();
      String temp = intent.getStringExtra(MainActivity.CURRENT_COUNTER);
      currentCounter = deserialization(temp);
    counters = loadFromFile();
    myIncTextView = (TextView) findViewById(R.id.counter_inc);
    myNameTextView = (TextView) findViewById(R.id.counter_name_display);
  }
   
  // loads the list of all the counters from a file and checks that the current counter still exists
  // calls finish if the current counter was deleted
  @Override
  protected void onResume() {
    super.onResume();
    counters = loadFromFile();
    boolean stillIn = false;
      for (int i = 0; i < counters.size(); i++) {
        if (counters.get(i).getName().equals(currentCounter.getName())) {
          stillIn = true;
          currentCounter = counters.get(i);
          myIncTextView.setText("" + currentCounter.getCount());
          myNameTextView.setText("" + currentCounter.getName());
          break;
        }
      }
      if (!stillIn) {
        finish();
      }
  }
  
  // called when the increment textview was clicked
  // increments the current counter, updates the counter list, and saves the counter list into a file
    public void callIncClick(View v) {
      currentCounter.incCount();
      myIncTextView.setText("" + currentCounter.getCount());
      for (int i = 0; i < counters.size(); i++) {
        if (counters.get(i).getName().equals(currentCounter.getName())) {
          counters.set(i, currentCounter);
          break;
        }
      }
      saveInFile(counters);
    }
  
    // called when the stats button was clicked
    // launches the CounterStatsActivity activity and provides the current counter to that activity
    public void callStatsClick(View v) {
      Intent intent = new Intent(this, CounterStatsActivity.class);
      String serialCurrentCounter = serialization(currentCounter);
      intent.putExtra(MainActivity.CURRENT_COUNTER, serialCurrentCounter);
      startActivity(intent);
    }
  
    // called when the settings button was clicked
    // launches the CounterSettingsActivity activity and provides the current counter to that activity
    public void callSettingsClick(View v) {
      Intent intent = new Intent(this, CounterSettingsActivity.class);
      String serialCurrentCounter = serialization(currentCounter);
      intent.putExtra(MainActivity.CURRENT_COUNTER, serialCurrentCounter);
      startActivity(intent);
    }
    
    // loads the counter list from a file
    private ArrayList<Counter> loadFromFile() {
      ArrayList<Counter> counters = new ArrayList<Counter>();
        try {
                FileInputStream fis = openFileInput(FILENAME);
                BufferedReader in = new BufferedReader(new InputStreamReader(fis));
                String line = in.readLine();
                
                while (line != null) {
                  Counter counter = deserialization(line);
                  counters.add(counter);
                    line = in.readLine();
                }

        } catch (FileNotFoundException e) {
                e.printStackTrace();
        } catch (IOException e) {
                e.printStackTrace();
        }
        return counters;
  }
    
    // saves the counter list to a file, overwriting what was there
    private void saveInFile(ArrayList<Counter> counters) {
    try {
      FileOutputStream fos = openFileOutput(FILENAME,
          Context.MODE_PRIVATE);
      
      for (int i = 0; i < counters.size(); i++) {
        Counter counter = counters.get(i);
        fos.write(serialization(counter).getBytes());
            }
      
      fos.close();
    } catch (FileNotFoundException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
    
    // returns a counter when given a serialized text
    private Counter deserialization(String text) {
        Gson gson = new Gson();
        Counter new_counter = gson.fromJson(text, Counter.class);
        return new_counter;
    }
    
    // returns a string when given a counter
    private String serialization(Counter counter) {
        Gson gson = new Gson();
        String json = gson.toJson(counter) + "\n";
        return json;
   }
}

Java Source Code List

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