Android Open Source - coursera-android-001 To Do Manager Activity

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License

The source code is released under:

MIT License

Java Source Code

package course.labs.todomanager;
//  w  ww  .  j  a v a  2  s. co m
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.text.ParseException;
import java.util.Date;

import android.app.ListActivity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.TextView;
import course.labs.todomanager.ToDoItem.Priority;
import course.labs.todomanager.ToDoItem.Status;

public class ToDoManagerActivity extends ListActivity {

  // Add a ToDoItem Request Code
  private static final int ADD_TODO_ITEM_REQUEST = 0;

  private static final String FILE_NAME = "TodoManagerActivityData.txt";
  private static final String TAG = "Lab-UserInterface";

  // IDs for menu items
  private static final int MENU_DELETE = Menu.FIRST;
  private static final int MENU_DUMP = Menu.FIRST + 1;

  ToDoListAdapter mAdapter;

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // Create a new TodoListAdapter for this ListActivity's ListView
    mAdapter = new ToDoListAdapter(getApplicationContext());

    // Put divider between ToDoItems and FooterView
    getListView().setFooterDividersEnabled(true);

    //Inflate footerView for footer_view.xml file
    TextView footerView = (TextView) getLayoutInflater().inflate(R.layout.footer_view, null);

    //Add footerView to ListView
        getListView().addFooterView(footerView);

        if (footerView != null) {
            footerView.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {

                    log("Entered footerView.OnClickListener.onClick()");

                    //Attach Listener to FooterView. Implement onClick().
                    Intent addToDoActivity = new Intent(getApplicationContext(), AddToDoActivity.class);
                    startActivityForResult(addToDoActivity, ADD_TODO_ITEM_REQUEST);
                }
            });
        }

    //Attach the adapter to this ListActivity's ListView
        getListView().setAdapter(mAdapter);
  }

  @Override
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {

    log("Entered onActivityResult()");

    // TODO - Check result code and request code.
    // If user submitted a new ToDoItem
    // Create a new ToDoItem from the data Intent
    // and then add it to the adapter
        if (resultCode == RESULT_OK) {
            if (requestCode == ADD_TODO_ITEM_REQUEST) {
                mAdapter.add(new ToDoItem(data));
            }
        }
  }

  // Do not modify below here

  @Override
  public void onResume() {
    super.onResume();

    // Load saved ToDoItems, if necessary

    if (mAdapter.getCount() == 0)
      loadItems();
  }

  @Override
  protected void onPause() {
    super.onPause();

    // Save ToDoItems

    saveItems();

  }

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    super.onCreateOptionsMenu(menu);

    menu.add(Menu.NONE, MENU_DELETE, Menu.NONE, "Delete all");
    menu.add(Menu.NONE, MENU_DUMP, Menu.NONE, "Dump to log");
    return true;
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
    case MENU_DELETE:
      mAdapter.clear();
      return true;
    case MENU_DUMP:
      dump();
      return true;
    default:
      return super.onOptionsItemSelected(item);
    }
  }

  private void dump() {

    for (int i = 0; i < mAdapter.getCount(); i++) {
      String data = ((ToDoItem) mAdapter.getItem(i)).toLog();
      log("Item " + i + ": " + data.replace(ToDoItem.ITEM_SEP, ","));
    }

  }

  // Load stored ToDoItems
  private void loadItems() {
    BufferedReader reader = null;
    try {
      FileInputStream fis = openFileInput(FILE_NAME);
      reader = new BufferedReader(new InputStreamReader(fis));

      String title = null;
      String priority = null;
      String status = null;
      Date date = null;

      while (null != (title = reader.readLine())) {
        priority = reader.readLine();
        status = reader.readLine();
        date = ToDoItem.FORMAT.parse(reader.readLine());
        mAdapter.add(new ToDoItem(title, Priority.valueOf(priority),
            Status.valueOf(status), date));
      }

    } catch (FileNotFoundException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    } catch (ParseException e) {
      e.printStackTrace();
    } finally {
      if (null != reader) {
        try {
          reader.close();
        } catch (IOException e) {
          e.printStackTrace();
        }
      }
    }
  }

  // Save ToDoItems to file
  private void saveItems() {
    PrintWriter writer = null;
    try {
      FileOutputStream fos = openFileOutput(FILE_NAME, MODE_PRIVATE);
      writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(
          fos)));

      for (int idx = 0; idx < mAdapter.getCount(); idx++) {

        writer.println(mAdapter.getItem(idx));

      }
    } catch (IOException e) {
      e.printStackTrace();
    } finally {
      if (null != writer) {
        writer.close();
      }
    }
  }

  private void log(String msg) {
    try {
      Thread.sleep(500);
    } catch (InterruptedException e) {
      e.printStackTrace();
    }
    Log.i(TAG, msg);
  }

}

Java Source Code List

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