AudioDemo.java

/***
  Copyright (c) 2008-2012 CommonsWare, LLC
  Licensed under the Apache License, Version 2.0 (the "License"); you may not
  use this file except in compliance with the License. You may obtain a copy
  of the License at http://www.apache.org/licenses/LICENSE-2.0. Unless required
  by applicable law or agreed to in writing, software distributed under the
  License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
  OF ANY KIND, either express or implied. See the License for the specific
  language governing permissions and limitations under the License.
  
  From _The Busy Coder's Guide to Advanced Android Development_
    http://commonsware.com/AdvAndroid
*/

package com.commonsware.android.audio;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.SharedPreferences;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ImageButton;
import android.widget.Toast;

public class AudioDemo extends Activity
  implements MediaPlayer.OnCompletionListener {
  
  private ImageButton play;
  private ImageButton pause;
  private ImageButton stop;
  private MediaPlayer mp;

  @Override
  public void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    setContentView(R.layout.main);
    
    play=(ImageButton)findViewById(R.id.play);
    pause=(ImageButton)findViewById(R.id.pause);
    stop=(ImageButton)findViewById(R.id.stop);
    
    play.setOnClickListener(new View.OnClickListener() {
      public void onClick(View view) {
        play();
      }
    });
    
    pause.setOnClickListener(new View.OnClickListener() {
      public void onClick(View view) {
        pause();
      }
    });
    
    stop.setOnClickListener(new View.OnClickListener() {
      public void onClick(View view) {
        stop();
      }
    });
    
    setup();
  }
  
  @Override
  public void onDestroy() {
    super.onDestroy();
    
    if (stop.isEnabled()) {
      stop();
    }
  }
  
  public void onCompletion(MediaPlayer mp) {
    stop();
  }
  
  private void play() {
    mp.start();
    
    play.setEnabled(false);
    pause.setEnabled(true);
    stop.setEnabled(true);
  }
  
  private void stop() {
    mp.stop();
    pause.setEnabled(false);
    stop.setEnabled(false);
    
    try {
      mp.prepare();
      mp.seekTo(0);
      play.setEnabled(true);
    }
    catch (Throwable t) {
      goBlooey(t);
    }
  }
  
  private void pause() {
    mp.pause();
    
    play.setEnabled(true);
    pause.setEnabled(false);
    stop.setEnabled(true);
  }
  
  private void loadClip() {
    try {
      mp=MediaPlayer.create(this, R.raw.clip);
      mp.setOnCompletionListener(this);
    }
    catch (Throwable t) {
      goBlooey(t);
    }
  }
  
  private void setup() {
    loadClip();
    play.setEnabled(true);
    pause.setEnabled(false);
    stop.setEnabled(false);
  }
  
  private void goBlooey(Throwable t) {
    AlertDialog.Builder builder=new AlertDialog.Builder(this);
    
    builder
      .setTitle("Exception!")
      .setMessage(t.toString())
      .setPositiveButton("OK", null)
      .show();
  }
}