Android Open Source - android-protobuf-example Address Book Activity

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License

The source code is released under:

Apache License

Java Source Code

package com.example.android;
/*w  ww  .ja v a  2s  .  co  m*/
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;

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.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.TextView;

import com.example.protobuf.R;
import com.example.tutorial.AddressBookProtos.AddressBook;
import com.example.tutorial.AddressBookProtos.Person;
import com.google.protobuf.InvalidProtocolBufferException;

public class AddressBookActivity extends ListActivity implements OnItemClickListener {

  private static final String ADDRESS_BOOK_FILE = "address_book.file";

  static final private int PERSON_EDIT_CODE = 0;

  private AddressBook.Builder addressBook;
  private AddressBookAdapter adapter;

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

    // read address book from local storage
    addressBook = readAddressBook();
    if (addressBook.getPersonCount() == 0) {
      // no data, so populate from the binary file included in assets
      addressBook.mergeFrom(readAddressBookFromAssets());
      writeAddressBook();
    }

    // set our list adapter
    adapter = new AddressBookAdapter(this, addressBook.getPersonList());
    setListAdapter(adapter);
    getListView().setOnItemClickListener(this);

  }
  
  @Override
  public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

    // get selected person
    Person p = addressBook.getPerson(position);

    // serialize the person as a byte array and pass to our person activity
    Intent intent = new Intent(this, PersonActivity.class);
    Bundle b = new Bundle();
    b.putByteArray(PersonActivity.PERSON_MSG_EXTRA, p.toByteArray());
    b.putInt(PersonActivity.PERSON_INDEX_EXTRA, position);
    intent.putExtras(b);
    startActivityForResult(intent, PERSON_EDIT_CODE);

  }

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

    if (requestCode == PERSON_EDIT_CODE) {
      if (resultCode != RESULT_CANCELED) {

        // read the serialized person object from the data
        Bundle b = data.getExtras();
        byte[] msg = b.getByteArray(PersonActivity.PERSON_MSG_EXTRA);
        int index = b.getInt(PersonActivity.PERSON_INDEX_EXTRA);

        Person p;
        try {
          p = Person.parseFrom(msg);

          if (index != PersonActivity.NEW_PERSON_INDEX) {
            // update address book
            addressBook.setPerson(index, p);
          } else {
            // add to address book
            addressBook.addPerson(p);
          }

          // recreate adapter with new data - a bit heavyweight but works for this example
          adapter = new AddressBookAdapter(this, addressBook.getPersonList());
          setListAdapter(adapter);

          // write the address book to local storage
          writeAddressBook();

        } catch (InvalidProtocolBufferException e) {
          e.printStackTrace();
        }

      }
    }
  }

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = this.getMenuInflater();
    inflater.inflate(R.menu.menu, menu);
    return true;
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
    case R.id.add:
      // start our activity with no extra data to create a new person
      Intent intent = new Intent(this, PersonActivity.class);
      startActivityForResult(intent, PERSON_EDIT_CODE);
      break;
    }
    return true;
  }

  private static class AddressBookAdapter extends ArrayAdapter<Person> {

    private LayoutInflater mInflater;
    private List<Person> mObjects;

    public AddressBookAdapter(Context context, List<Person> objects) {
      super(context, 0, objects);
      mInflater = LayoutInflater.from(context);
      mObjects = objects;
    }

    @Override
    public long getItemId(int position) {
      return mObjects.get(position).getId();
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

      // standard view holder pattern boilerplate
      ViewHolder holder;
      if (convertView == null) {
        convertView = mInflater.inflate(android.R.layout.simple_list_item_2, null);
        holder = new ViewHolder();
        holder.name = (TextView) convertView.findViewById(android.R.id.text1);
        holder.email = (TextView) convertView.findViewById(android.R.id.text2);
        convertView.setTag(holder);
      } else {
        holder = (ViewHolder) convertView.getTag();
      }

      // map person fields to corresponding textviews
      Person person = mObjects.get(position);
      holder.name.setText(person.getName());
      holder.email.setText(person.getEmail());

      return convertView;
    }

    static class ViewHolder {
      TextView name;
      TextView email;
    }

  }


  private AddressBook.Builder readAddressBook() {

    try {
      return AddressBook.parseFrom(openFileInput(ADDRESS_BOOK_FILE)).toBuilder();
    } catch (FileNotFoundException e) {
      Log.i(getString(R.string.app_name), "No address book file previously saved");
    } catch (IOException e) {
      e.printStackTrace();
    }
    return AddressBook.newBuilder();

  }

  private void writeAddressBook() {

    try {
      addressBook.build().writeTo(openFileOutput(ADDRESS_BOOK_FILE, Context.MODE_PRIVATE));
    } catch (FileNotFoundException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }

  }

  private AddressBook readAddressBookFromAssets() {

    InputStream is;
    try {
      is = getAssets().open(ADDRESS_BOOK_FILE);
      return AddressBook.parseFrom(is);
    } catch (IOException e) {
      e.printStackTrace();
    }
    return AddressBook.getDefaultInstance();

  }

}

Java Source Code List

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