Android Open Source - Handalfabet User Activity

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License

The source code is released under:
GNU General Public License
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Java Source Code

package com.example.android;
//from  w ww . ja  v  a2s  . c  om
import java.util.List;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Build;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;

/**
 *    Copyright? 2012, Grupp02
 * 
 *     This file is part of Handalfabetet.
 *
 *   Handalfabetet is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   Handalfabetet is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with Handalfabetet.  If not, see <http://www.gnu.org/licenses/>.
 */

/**
 * The UserActivity class handles the user login screen.
 * 
 * @author : Grupp02
 * @version : 2012-10-19, v1.0
 * 
 */
public class UserActivity extends Activity {

    // Audio Focus helper
    private AudioFocusHelper focusHelper;

    private SoundSettings soundData;
    private final static int MAX_VOLUME = 100;

    private Button loginButton;
    private ListView listView;
    private List<User> list;
    User player;
    private DatabaseHelper db;
    String playerName;

    private Bitmap bitImg;
    private TextView userName;

    private final int zero = 0;
    private final int one = 1;
    private final int two = 2;

    @Override
    public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_user);

  db = new DatabaseHelper(this);
  soundData = new SoundSettings(this);

  if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.FROYO) {
      focusHelper = new AudioFocusHelper(this);
  } else {
      focusHelper = null;
  }

  listView = (ListView) findViewById(R.id.list);
  userName = (TextView) findViewById(R.id.textView1);
  loginButton = (Button) findViewById(R.id.login);

  loginButton.setEnabled(false);

  playerName = userName.getText().toString();

  enableLoginButton();
    }

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

  list = db.getAllUsersName();
  // Create ArrayAdapter using the user list.
  UserArrayAdapter adapter = new UserArrayAdapter(this,
    R.layout.activity_user_array_adapter, list);
  adapter.inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
  listView.setAdapter(adapter);

  listView.setOnItemClickListener(new OnItemClickListener() {
      public void onItemClick(AdapterView<?> parent, View view,
        int position, long id) {
    User user = list.get(position);
    userName.setText(user.getName());
    bitImg = user.getUserImg();
      }
  });

  // On resume for sound
  if (SoundPlayer.getSoundEnabled() == false) {
      if (focusHelper != null) {
    focusHelper.abandonFocus();
      }
      SoundPlayer.stop();
  } else {
      SoundPlayer.resume();
  }
    }

    @Override
    public void onPause() {
  super.onPause(); // Always call the superclass method first

  // Pause sound when paused
  if (SoundPlayer.getSoundEnabled()) {
      SoundPlayer.pause();
  }
    }

    @Override
    public void onSaveInstanceState(Bundle savedInstanceState) {
  // Save name, user status, and user picture
  savedInstanceState.putString("Name", userName.getText().toString());
  savedInstanceState.putParcelable("picture", bitImg);
  savedInstanceState.putBoolean("login", loginButton.isEnabled());

  // Always call the superclass so it can save the view hierarchy state
  super.onSaveInstanceState(savedInstanceState);
    }

    @Override
    public void onRestoreInstanceState(Bundle savedInstanceState) {
  // Always call the superclass so it can restore the view hierarchy
  super.onRestoreInstanceState(savedInstanceState);

  // Restore name, user status, and user picture
  userName.setText(savedInstanceState.getString("Name"));
  bitImg = savedInstanceState.getParcelable("picture");
  loginButton.setEnabled(savedInstanceState.getBoolean("login"));
    }

    /** Called when the user clicks the Create New Player button */
    public void createNewPlayer(View v) {
  playButton();
  startActivity(new Intent("android.intent.action.CREATENEWPLAYER"));
    }

    private void enableLoginButton() {
  userName.addTextChangedListener(new TextWatcher() {
      public void afterTextChanged(Editable s) {

      }

      public void beforeTextChanged(CharSequence s, int start, int count,
        int after) {

      }

      public void onTextChanged(CharSequence s, int start, int before,
        int count) {
    if (userName.getText().length() > two) {
        loginButton.setEnabled(true);
    } else {
        loginButton.setEnabled(false);
    }
      }
  });
    }

    /**
     * Retrieve and set the user sound settings from database
     */
    private void getSoundSettings() {
  String name = userName.getText().toString();

  // Restores data to SoundPlayer
  if (name != null) {
      if (name != "") {
    soundData.getEntry(name);
      }
  }

  int soundVolume = SoundPlayer.getCurrentVolume();

  // Restore volume setting
  float volume = (float) (one - (Math.log(MAX_VOLUME - soundVolume) / Math
    .log(MAX_VOLUME)));
  SoundPlayer.setVolume(volume, volume);
    }

    /** Scales down User picture */
    private static Bitmap scaleDownBitmap(Bitmap photo, int newHeight,
      Context context) {

  final float densityMultiplier = context.getResources()
    .getDisplayMetrics().density;

  int h = (int) (newHeight * densityMultiplier);
  int w = (int) (h * photo.getWidth() / ((double) photo.getHeight()));

  photo = Bitmap.createScaledBitmap(photo, w, h, true);

  return photo;
    }

    /** Called when the user clicks the Login button */
    public void Login(View v) {
  playButton();
  Bitmap img = scaleDownBitmap(bitImg, 55, this);

  // Get and set the user sound settings upon login
  getSoundSettings();

  Intent intent = getIntent();
  intent.putExtra("PlayerName", userName.getText().toString());
  intent.putExtra("userImg", img);
  setResult(RESULT_OK, intent);
  finish();
    }

    /**
     * The getAudioFocus method attempts to gain focus for playing audio. If
     * full access can't be gained, transitive access at a quiet volume is
     * attempted. If that can't be granted, false is returned.
     * 
     * @return : true if focus in some form is granted, otherwise false
     */
    private boolean getAudioFocus() {

  if (focusHelper != null) {
      if (!focusHelper.requestFocus()) {
    if (!focusHelper.requestQuietFocus()) {
        return false;
    } else {
        return true;
    }
      } else {
    return true;
      }
  }

  return false;
    }

    /**
     * playButton plays the button sound
     * 
     * If there is an AudioFocusHelper (api >= 8) use it, otherwise default to
     * SoundPlayer
     */
    public void playButton() {
  if (SoundPlayer.getSoundEnabled()) {
      if (focusHelper != null) {
    if (getAudioFocus()) {
        focusHelper.playButton();
    }
      } else {
    SoundPlayer.playButton(this);
      }
  }
    }

    /**
     * onStop is called when the activity is shut down, usually before being
     * destroyed. We need to stop any media players to properly free up memory.
     * The focus helper should lose focus anyway, but no reason not to tie up
     * loose ends.
     */
    @Override
    public void onStop() {
  // cancel any noises and abandon focus
  SoundPlayer.stop();

  if (focusHelper != null) {
      focusHelper.abandonFocus();
  }

  // call the super method
  super.onStop();
    }

    /**
     * onKeyDown overrides onKeyDown and allows code to be executed when the
     * back button is pushed in the simulator / on the mobile phone Since
     * pushing "back" won't necessarily call the destroy method as far as I
     * understand it.
     * 
     * @param keyCode
     *            : code of the key pressed
     * @param event
     *            : the event for the key pressed
     */
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
  if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == zero) {

      // continue backwards (kills current activity calling onDestroy)
      finish();

      return true;
  }

  return super.onKeyDown(keyCode, event);
    }
}
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