src/com/android/music/AudioPreview.java - platform/packages/apps/Music - Git at Google

 /*
  * Copyright (C) 2010 The Android Open Source Project
  *
  * 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.
  */

 package com.android.music;

 import android.app.Activity;
 import android.content.AsyncQueryHandler;
 import android.content.ContentResolver;
 import android.content.Context;
 import android.content.Intent;
 import android.database.Cursor;
 import android.media.AudioManager;
 import android.media.MediaPlayer;
 import android.media.AudioManager.OnAudioFocusChangeListener;
 import android.media.MediaPlayer.OnCompletionListener;
 import android.media.MediaPlayer.OnErrorListener;
 import android.media.MediaPlayer.OnPreparedListener;
 import android.net.Uri;
 import android.os.Bundle;
 import android.os.Handler;
 import android.provider.MediaStore;
 import android.provider.OpenableColumns;
 import android.text.TextUtils;
 import android.util.Log;
 import android.view.KeyEvent;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
 import android.view.Window;
 import android.view.WindowManager;
 import android.widget.ImageButton;
 import android.widget.ProgressBar;
 import android.widget.SeekBar;
 import android.widget.TextView;
 import android.widget.SeekBar.OnSeekBarChangeListener;
 import android.widget.Toast;

 import java.io.IOException;

 /**
  * Dialog that comes up in response to various music-related VIEW intents.
  */
 public class AudioPreview extends Activity implements OnPreparedListener, OnErrorListener, OnCompletionListener
 {
     private final static String TAG = "AudioPreview";
     private PreviewPlayer mPlayer;
     private TextView mTextLine1;
     private TextView mTextLine2;
     private TextView mLoadingText;
     private SeekBar mSeekBar;
     private Handler mProgressRefresher;
     private boolean mSeeking = false;
     private int mDuration;
     private Uri mUri;
     private long mMediaId = -1;
     private static final int OPEN_IN_MUSIC = 1;
     private AudioManager mAudioManager;
     private boolean mPausedByTransientLossOfFocus;

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

         Intent intent = getIntent();
         if (intent == null) {
             finish();
             return;
         }
         mUri = intent.getData();
         if (mUri == null) {
             finish();
             return;
         }
         String scheme = mUri.getScheme();

         setVolumeControlStream(AudioManager.STREAM_MUSIC);
         requestWindowFeature(Window.FEATURE_NO_TITLE);
         setContentView(R.layout.audiopreview);

         mTextLine1 = (TextView) findViewById(R.id.line1);
         mTextLine2 = (TextView) findViewById(R.id.line2);
         mLoadingText = (TextView) findViewById(R.id.loading);
         if (scheme.equals("http")) {
             String msg = getString(R.string.streamloadingtext, mUri.getHost());
             mLoadingText.setText(msg);
         } else {
             mLoadingText.setVisibility(View.GONE);
         }
         mSeekBar = (SeekBar) findViewById(R.id.progress);
         mProgressRefresher = new Handler();
         mAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);

         PreviewPlayer player = (PreviewPlayer) getLastNonConfigurationInstance();
         if (player == null) {
             mPlayer = new PreviewPlayer();
             mPlayer.setActivity(this);
             try {
                 mPlayer.setDataSourceAndPrepare(mUri);
             } catch (Exception ex) {
                 // catch generic Exception, since we may be called with a media
                 // content URI, another content provider's URI, a file URI,
                 // an http URI, and there are different exceptions associated
                 // with failure to open each of those.
                 Log.d(TAG, "Failed to open file: " + ex);
                 Toast.makeText(this, R.string.playback_failed, Toast.LENGTH_SHORT).show();
                 finish();
                 return;
             }
         } else {
             mPlayer = player;
             mPlayer.setActivity(this);
             if (mPlayer.isPrepared()) {
                 showPostPrepareUI();
             }
         }

         AsyncQueryHandler mAsyncQueryHandler = new AsyncQueryHandler(getContentResolver()) {
             @Override
             protected void onQueryComplete(int token, Object cookie, Cursor cursor) {
                 if (cursor != null && cursor.moveToFirst()) {

                     int titleIdx = cursor.getColumnIndex(MediaStore.Audio.Media.TITLE);
                     int artistIdx = cursor.getColumnIndex(MediaStore.Audio.Media.ARTIST);
                     int idIdx = cursor.getColumnIndex(MediaStore.Audio.Media._ID);
                     int displaynameIdx = cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME);

                     if (idIdx >=0) {
                         mMediaId = cursor.getLong(idIdx);
                     }

                     if (titleIdx >= 0) {
                         String title = cursor.getString(titleIdx);
                         mTextLine1.setText(title);
                         if (artistIdx >= 0) {
                             String artist = cursor.getString(artistIdx);
                             mTextLine2.setText(artist);
                         }
                     } else if (displaynameIdx >= 0) {
                         String name = cursor.getString(displaynameIdx);
                         mTextLine1.setText(name);
                     } else {
                         // Couldn't find anything to display, what to do now?
                         Log.w(TAG, "Cursor had no names for us");
                     }
                 } else {
                     Log.w(TAG, "empty cursor");
                 }

                 if (cursor != null) {
                     cursor.close();
                 }
                 setNames();
             }
         };

         if (scheme.equals(ContentResolver.SCHEME_CONTENT)) {
             if (mUri.getAuthority() == MediaStore.AUTHORITY) {
                 // try to get title and artist from the media content provider
                 mAsyncQueryHandler.startQuery(0, null, mUri, new String [] {
                         MediaStore.Audio.Media.TITLE, MediaStore.Audio.Media.ARTIST},
                         null, null, null);
             } else {
                 // Try to get the display name from another content provider.
                 // Don't specifically ask for the display name though, since the
                 // provider might not actually support that column.
                 mAsyncQueryHandler.startQuery(0, null, mUri, null, null, null, null);
             }
         } else if (scheme.equals("file")) {
             // check if this file is in the media database (clicking on a download
             // in the download manager might follow this path
             String path = mUri.getPath();
             mAsyncQueryHandler.startQuery(0, null,  MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
                     new String [] {MediaStore.Audio.Media._ID,
                         MediaStore.Audio.Media.TITLE, MediaStore.Audio.Media.ARTIST},
                     MediaStore.Audio.Media.DATA + "=?", new String [] {path}, null);
         } else {
             // We can't get metadata from the file/stream itself yet, because
             // that API is hidden, so instead we display the URI being played
             if (mPlayer.isPrepared()) {
                 setNames();
             }
         }
     }

     @Override
     public Object onRetainNonConfigurationInstance() {
         PreviewPlayer player = mPlayer;
         mPlayer = null;
         return player;
     }

     @Override
     public void onDestroy() {
         stopPlayback();
         super.onDestroy();
     }

     private void stopPlayback() {
         if (mProgressRefresher != null) {
             mProgressRefresher.removeCallbacksAndMessages(null);
         }
         if (mPlayer != null) {
             mPlayer.release();
             mPlayer = null;
             mAudioManager.abandonAudioFocus(mAudioFocusListener);
         }
     }

     @Override
     public void onUserLeaveHint() {
         stopPlayback();
         finish();
         super.onUserLeaveHint();
     }

     public void onPrepared(MediaPlayer mp) {
         if (isFinishing()) return;
         mPlayer = (PreviewPlayer) mp;
         setNames();
         mPlayer.start();
         showPostPrepareUI();
     }

     private void showPostPrepareUI() {
         ProgressBar pb = (ProgressBar) findViewById(R.id.spinner);
         pb.setVisibility(View.GONE);
         mDuration = mPlayer.getDuration();
         if (mDuration != 0) {
             mSeekBar.setMax(mDuration);
             mSeekBar.setVisibility(View.VISIBLE);
         }
         mSeekBar.setOnSeekBarChangeListener(mSeekListener);
         mLoadingText.setVisibility(View.GONE);
         View v = findViewById(R.id.titleandbuttons);
         v.setVisibility(View.VISIBLE);
         mAudioManager.requestAudioFocus(mAudioFocusListener, AudioManager.STREAM_MUSIC,
                 AudioManager.AUDIOFOCUS_GAIN_TRANSIENT);
         mProgressRefresher.postDelayed(new ProgressRefresher(), 200);
         updatePlayPause();
     }

     private OnAudioFocusChangeListener mAudioFocusListener = new OnAudioFocusChangeListener() {
         public void onAudioFocusChange(int focusChange) {
             if (mPlayer == null) {
                 // this activity has handed its MediaPlayer off to the next activity
                 // (e.g. portrait/landscape switch) and should abandon its focus
                 mAudioManager.abandonAudioFocus(this);
                 return;
             }
             switch (focusChange) {
                 case AudioManager.AUDIOFOCUS_LOSS:
                     mPausedByTransientLossOfFocus = false;
                     mPlayer.pause();
                     break;
                 case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT:
                 case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK:
                     if (mPlayer.isPlaying()) {
                         mPausedByTransientLossOfFocus = true;
                         mPlayer.pause();
                     }
                     break;
                 case AudioManager.AUDIOFOCUS_GAIN:
                     if (mPausedByTransientLossOfFocus) {
                         mPausedByTransientLossOfFocus = false;
                         start();
                     }
                     break;
             }
             updatePlayPause();
         }
     };

     private void start() {
         mAudioManager.requestAudioFocus(mAudioFocusListener, AudioManager.STREAM_MUSIC,
                 AudioManager.AUDIOFOCUS_GAIN_TRANSIENT);
         mPlayer.start();
         mProgressRefresher.postDelayed(new ProgressRefresher(), 200);
     }

     public void setNames() {
         if (TextUtils.isEmpty(mTextLine1.getText())) {
             mTextLine1.setText(mUri.getLastPathSegment());
         }
         if (TextUtils.isEmpty(mTextLine2.getText())) {
             mTextLine2.setVisibility(View.GONE);
         } else {
             mTextLine2.setVisibility(View.VISIBLE);
         }
     }

     class ProgressRefresher implements Runnable {

         public void run() {
             if (mPlayer != null && !mSeeking && mDuration != 0) {
                 int progress = mPlayer.getCurrentPosition() / mDuration;
                 mSeekBar.setProgress(mPlayer.getCurrentPosition());
             }
             mProgressRefresher.removeCallbacksAndMessages(null);
             mProgressRefresher.postDelayed(new ProgressRefresher(), 200);
         }
     }

     private void updatePlayPause() {
         ImageButton b = (ImageButton) findViewById(R.id.playpause);
         if (b != null) {
             if (mPlayer.isPlaying()) {
                 b.setImageResource(R.drawable.btn_playback_ic_pause_small);
             } else {
                 b.setImageResource(R.drawable.btn_playback_ic_play_small);
                 mProgressRefresher.removeCallbacksAndMessages(null);
             }
         }
     }

     private OnSeekBarChangeListener mSeekListener = new OnSeekBarChangeListener() {
         public void onStartTrackingTouch(SeekBar bar) {
             mSeeking = true;
         }
         public void onProgressChanged(SeekBar bar, int progress, boolean fromuser) {
             if (!fromuser) {
                 return;
             }
             // Protection for case of simultaneously tapping on seek bar and exit
             if (mPlayer == null) {
                 return;
             }
             mPlayer.seekTo(progress);
         }
         public void onStopTrackingTouch(SeekBar bar) {
             mSeeking = false;
         }
     };

     public boolean onError(MediaPlayer mp, int what, int extra) {
         Toast.makeText(this, R.string.playback_failed, Toast.LENGTH_SHORT).show();
         finish();
         return true;
     }

     public void onCompletion(MediaPlayer mp) {
         mSeekBar.setProgress(mDuration);
         updatePlayPause();
     }

     public void playPauseClicked(View v) {
         // Protection for case of simultaneously tapping on play/pause and exit
         if (mPlayer == null) {
             return;
         }
         if (mPlayer.isPlaying()) {
             mPlayer.pause();
         } else {
             start();
         }
         updatePlayPause();
     }

     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
         super.onCreateOptionsMenu(menu);
         // TODO: if mMediaId != -1, then the playing file has an entry in the media
         // database, and we could open it in the full music app instead.
         // Ideally, we would hand off the currently running mediaplayer
         // to the music UI, which can probably be done via a public static
         menu.add(0, OPEN_IN_MUSIC, 0, "open in music");
         return true;
     }

     @Override
     public boolean onPrepareOptionsMenu(Menu menu) {
         MenuItem item = menu.findItem(OPEN_IN_MUSIC);
         if (mMediaId >= 0) {
             item.setVisible(true);
             return true;
         }
         item.setVisible(false);
         return false;
     }

     @Override
     public boolean onKeyDown(int keyCode, KeyEvent event) {
         switch (keyCode) {
             case KeyEvent.KEYCODE_HEADSETHOOK:
             case KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE:
                 if (mPlayer.isPlaying()) {
                     mPlayer.pause();
                 } else {
                     start();
                 }
                 updatePlayPause();
                 return true;
             case KeyEvent.KEYCODE_MEDIA_PLAY:
                 start();
                 updatePlayPause();
                 return true;
             case KeyEvent.KEYCODE_MEDIA_PAUSE:
                 if (mPlayer.isPlaying()) {
                     mPlayer.pause();
                 }
                 updatePlayPause();
                 return true;
             case KeyEvent.KEYCODE_MEDIA_FAST_FORWARD:
             case KeyEvent.KEYCODE_MEDIA_NEXT:
             case KeyEvent.KEYCODE_MEDIA_PREVIOUS:
             case KeyEvent.KEYCODE_MEDIA_REWIND:
                 return true;
             case KeyEvent.KEYCODE_MEDIA_STOP:
             case KeyEvent.KEYCODE_BACK:
                 stopPlayback();
                 finish();
                 return true;
         }
         return super.onKeyDown(keyCode, event);
     }

     /*
      * Wrapper class to help with handing off the MediaPlayer to the next instance
      * of the activity in case of orientation change, without losing any state.
      */
     private static class PreviewPlayer extends MediaPlayer implements OnPreparedListener {
         AudioPreview mActivity;
         boolean mIsPrepared = false;

         public void setActivity(AudioPreview activity) {
             mActivity = activity;
             setOnPreparedListener(this);
             setOnErrorListener(mActivity);
             setOnCompletionListener(mActivity);
         }

         public void setDataSourceAndPrepare(Uri uri) throws IllegalArgumentException,
                         SecurityException, IllegalStateException, IOException {
             setDataSource(mActivity,uri);
             prepareAsync();
         }

         /* (non-Javadoc)
          * @see android.media.MediaPlayer.OnPreparedListener#onPrepared(android.media.MediaPlayer)
          */
         @Override
         public void onPrepared(MediaPlayer mp) {
             mIsPrepared = true;
             mActivity.onPrepared(mp);
         }

         boolean isPrepared() {
             return mIsPrepared;
         }
     }

 }
	/*
	* Copyright (C) 2010 The Android Open Source Project
	*
	* 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.
	*/

	package com.android.music;

	import android.app.Activity;
	import android.content.AsyncQueryHandler;
	import android.content.ContentResolver;
	import android.content.Context;
	import android.content.Intent;
	import android.database.Cursor;
	import android.media.AudioManager;
	import android.media.MediaPlayer;
	import android.media.AudioManager.OnAudioFocusChangeListener;
	import android.media.MediaPlayer.OnCompletionListener;
	import android.media.MediaPlayer.OnErrorListener;
	import android.media.MediaPlayer.OnPreparedListener;
	import android.net.Uri;
	import android.os.Bundle;
	import android.os.Handler;
	import android.provider.MediaStore;
	import android.provider.OpenableColumns;
	import android.text.TextUtils;
	import android.util.Log;
	import android.view.KeyEvent;
	import android.view.Menu;
	import android.view.MenuItem;
	import android.view.View;
	import android.view.Window;
	import android.view.WindowManager;
	import android.widget.ImageButton;
	import android.widget.ProgressBar;
	import android.widget.SeekBar;
	import android.widget.TextView;
	import android.widget.SeekBar.OnSeekBarChangeListener;
	import android.widget.Toast;

	import java.io.IOException;

	/**
	* Dialog that comes up in response to various music-related VIEW intents.
	*/
	public class AudioPreview extends Activity implements OnPreparedListener, OnErrorListener, OnCompletionListener
	{
	private final static String TAG = "AudioPreview";
	private PreviewPlayer mPlayer;
	private TextView mTextLine1;
	private TextView mTextLine2;
	private TextView mLoadingText;
	private SeekBar mSeekBar;
	private Handler mProgressRefresher;
	private boolean mSeeking = false;
	private int mDuration;
	private Uri mUri;
	private long mMediaId = -1;
	private static final int OPEN_IN_MUSIC = 1;
	private AudioManager mAudioManager;
	private boolean mPausedByTransientLossOfFocus;

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

	Intent intent = getIntent();
	if (intent == null) {
	finish();
	return;
	}
	mUri = intent.getData();
	if (mUri == null) {
	finish();
	return;
	}
	String scheme = mUri.getScheme();

	setVolumeControlStream(AudioManager.STREAM_MUSIC);
	requestWindowFeature(Window.FEATURE_NO_TITLE);
	setContentView(R.layout.audiopreview);

	mTextLine1 = (TextView) findViewById(R.id.line1);
	mTextLine2 = (TextView) findViewById(R.id.line2);
	mLoadingText = (TextView) findViewById(R.id.loading);
	if (scheme.equals("http")) {
	String msg = getString(R.string.streamloadingtext, mUri.getHost());
	mLoadingText.setText(msg);
	} else {
	mLoadingText.setVisibility(View.GONE);
	}
	mSeekBar = (SeekBar) findViewById(R.id.progress);
	mProgressRefresher = new Handler();
	mAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);

	PreviewPlayer player = (PreviewPlayer) getLastNonConfigurationInstance();
	if (player == null) {
	mPlayer = new PreviewPlayer();
	mPlayer.setActivity(this);
	try {
	mPlayer.setDataSourceAndPrepare(mUri);
	} catch (Exception ex) {
	// catch generic Exception, since we may be called with a media
	// content URI, another content provider's URI, a file URI,
	// an http URI, and there are different exceptions associated
	// with failure to open each of those.
	Log.d(TAG, "Failed to open file: " + ex);
	Toast.makeText(this, R.string.playback_failed, Toast.LENGTH_SHORT).show();
	finish();
	return;
	}
	} else {
	mPlayer = player;
	mPlayer.setActivity(this);
	if (mPlayer.isPrepared()) {
	showPostPrepareUI();
	}
	}

	AsyncQueryHandler mAsyncQueryHandler = new AsyncQueryHandler(getContentResolver()) {
	@Override
	protected void onQueryComplete(int token, Object cookie, Cursor cursor) {
	if (cursor != null && cursor.moveToFirst()) {

	int titleIdx = cursor.getColumnIndex(MediaStore.Audio.Media.TITLE);
	int artistIdx = cursor.getColumnIndex(MediaStore.Audio.Media.ARTIST);
	int idIdx = cursor.getColumnIndex(MediaStore.Audio.Media._ID);
	int displaynameIdx = cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME);

	if (idIdx >=0) {
	mMediaId = cursor.getLong(idIdx);
	}

	if (titleIdx >= 0) {
	String title = cursor.getString(titleIdx);
	mTextLine1.setText(title);
	if (artistIdx >= 0) {
	String artist = cursor.getString(artistIdx);
	mTextLine2.setText(artist);
	}
	} else if (displaynameIdx >= 0) {
	String name = cursor.getString(displaynameIdx);
	mTextLine1.setText(name);
	} else {
	// Couldn't find anything to display, what to do now?
	Log.w(TAG, "Cursor had no names for us");
	}
	} else {
	Log.w(TAG, "empty cursor");
	}

	if (cursor != null) {
	cursor.close();
	}
	setNames();
	}
	};

	if (scheme.equals(ContentResolver.SCHEME_CONTENT)) {
	if (mUri.getAuthority() == MediaStore.AUTHORITY) {
	// try to get title and artist from the media content provider
	mAsyncQueryHandler.startQuery(0, null, mUri, new String [] {
	MediaStore.Audio.Media.TITLE, MediaStore.Audio.Media.ARTIST},
	null, null, null);
	} else {
	// Try to get the display name from another content provider.
	// Don't specifically ask for the display name though, since the
	// provider might not actually support that column.
	mAsyncQueryHandler.startQuery(0, null, mUri, null, null, null, null);
	}
	} else if (scheme.equals("file")) {
	// check if this file is in the media database (clicking on a download
	// in the download manager might follow this path
	String path = mUri.getPath();
	mAsyncQueryHandler.startQuery(0, null, MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
	new String [] {MediaStore.Audio.Media._ID,
	MediaStore.Audio.Media.TITLE, MediaStore.Audio.Media.ARTIST},
	MediaStore.Audio.Media.DATA + "=?", new String [] {path}, null);
	} else {
	// We can't get metadata from the file/stream itself yet, because
	// that API is hidden, so instead we display the URI being played
	if (mPlayer.isPrepared()) {
	setNames();
	}
	}
	}

	@Override
	public Object onRetainNonConfigurationInstance() {
	PreviewPlayer player = mPlayer;
	mPlayer = null;
	return player;
	}

	@Override
	public void onDestroy() {
	stopPlayback();
	super.onDestroy();
	}

	private void stopPlayback() {
	if (mProgressRefresher != null) {
	mProgressRefresher.removeCallbacksAndMessages(null);
	}
	if (mPlayer != null) {
	mPlayer.release();
	mPlayer = null;
	mAudioManager.abandonAudioFocus(mAudioFocusListener);
	}
	}

	@Override
	public void onUserLeaveHint() {
	stopPlayback();
	finish();
	super.onUserLeaveHint();
	}

	public void onPrepared(MediaPlayer mp) {
	if (isFinishing()) return;
	mPlayer = (PreviewPlayer) mp;
	setNames();
	mPlayer.start();
	showPostPrepareUI();
	}

	private void showPostPrepareUI() {
	ProgressBar pb = (ProgressBar) findViewById(R.id.spinner);
	pb.setVisibility(View.GONE);
	mDuration = mPlayer.getDuration();
	if (mDuration != 0) {
	mSeekBar.setMax(mDuration);
	mSeekBar.setVisibility(View.VISIBLE);
	}
	mSeekBar.setOnSeekBarChangeListener(mSeekListener);
	mLoadingText.setVisibility(View.GONE);
	View v = findViewById(R.id.titleandbuttons);
	v.setVisibility(View.VISIBLE);
	mAudioManager.requestAudioFocus(mAudioFocusListener, AudioManager.STREAM_MUSIC,
	AudioManager.AUDIOFOCUS_GAIN_TRANSIENT);
	mProgressRefresher.postDelayed(new ProgressRefresher(), 200);
	updatePlayPause();
	}

	private OnAudioFocusChangeListener mAudioFocusListener = new OnAudioFocusChangeListener() {
	public void onAudioFocusChange(int focusChange) {
	if (mPlayer == null) {
	// this activity has handed its MediaPlayer off to the next activity
	// (e.g. portrait/landscape switch) and should abandon its focus
	mAudioManager.abandonAudioFocus(this);
	return;
	}
	switch (focusChange) {
	case AudioManager.AUDIOFOCUS_LOSS:
	mPausedByTransientLossOfFocus = false;
	mPlayer.pause();
	break;
	case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT:
	case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK:
	if (mPlayer.isPlaying()) {
	mPausedByTransientLossOfFocus = true;
	mPlayer.pause();
	}
	break;
	case AudioManager.AUDIOFOCUS_GAIN:
	if (mPausedByTransientLossOfFocus) {
	mPausedByTransientLossOfFocus = false;
	start();
	}
	break;
	}
	updatePlayPause();
	}
	};

	private void start() {
	mAudioManager.requestAudioFocus(mAudioFocusListener, AudioManager.STREAM_MUSIC,
	AudioManager.AUDIOFOCUS_GAIN_TRANSIENT);
	mPlayer.start();
	mProgressRefresher.postDelayed(new ProgressRefresher(), 200);
	}

	public void setNames() {
	if (TextUtils.isEmpty(mTextLine1.getText())) {
	mTextLine1.setText(mUri.getLastPathSegment());
	}
	if (TextUtils.isEmpty(mTextLine2.getText())) {
	mTextLine2.setVisibility(View.GONE);
	} else {
	mTextLine2.setVisibility(View.VISIBLE);
	}
	}

	class ProgressRefresher implements Runnable {

	public void run() {
	if (mPlayer != null && !mSeeking && mDuration != 0) {
	int progress = mPlayer.getCurrentPosition() / mDuration;
	mSeekBar.setProgress(mPlayer.getCurrentPosition());
	}
	mProgressRefresher.removeCallbacksAndMessages(null);
	mProgressRefresher.postDelayed(new ProgressRefresher(), 200);
	}
	}

	private void updatePlayPause() {
	ImageButton b = (ImageButton) findViewById(R.id.playpause);
	if (b != null) {
	if (mPlayer.isPlaying()) {
	b.setImageResource(R.drawable.btn_playback_ic_pause_small);
	} else {
	b.setImageResource(R.drawable.btn_playback_ic_play_small);
	mProgressRefresher.removeCallbacksAndMessages(null);
	}
	}
	}

	private OnSeekBarChangeListener mSeekListener = new OnSeekBarChangeListener() {
	public void onStartTrackingTouch(SeekBar bar) {
	mSeeking = true;
	}
	public void onProgressChanged(SeekBar bar, int progress, boolean fromuser) {
	if (!fromuser) {
	return;
	}
	// Protection for case of simultaneously tapping on seek bar and exit
	if (mPlayer == null) {
	return;
	}
	mPlayer.seekTo(progress);
	}
	public void onStopTrackingTouch(SeekBar bar) {
	mSeeking = false;
	}
	};

	public boolean onError(MediaPlayer mp, int what, int extra) {
	Toast.makeText(this, R.string.playback_failed, Toast.LENGTH_SHORT).show();
	finish();
	return true;
	}

	public void onCompletion(MediaPlayer mp) {
	mSeekBar.setProgress(mDuration);
	updatePlayPause();
	}

	public void playPauseClicked(View v) {
	// Protection for case of simultaneously tapping on play/pause and exit
	if (mPlayer == null) {
	return;
	}
	if (mPlayer.isPlaying()) {
	mPlayer.pause();
	} else {
	start();
	}
	updatePlayPause();
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
	super.onCreateOptionsMenu(menu);
	// TODO: if mMediaId != -1, then the playing file has an entry in the media
	// database, and we could open it in the full music app instead.
	// Ideally, we would hand off the currently running mediaplayer
	// to the music UI, which can probably be done via a public static
	menu.add(0, OPEN_IN_MUSIC, 0, "open in music");
	return true;
	}

	@Override
	public boolean onPrepareOptionsMenu(Menu menu) {
	MenuItem item = menu.findItem(OPEN_IN_MUSIC);
	if (mMediaId >= 0) {
	item.setVisible(true);
	return true;
	}
	item.setVisible(false);
	return false;
	}

	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
	switch (keyCode) {
	case KeyEvent.KEYCODE_HEADSETHOOK:
	case KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE:
	if (mPlayer.isPlaying()) {
	mPlayer.pause();
	} else {
	start();
	}
	updatePlayPause();
	return true;
	case KeyEvent.KEYCODE_MEDIA_PLAY:
	start();
	updatePlayPause();
	return true;
	case KeyEvent.KEYCODE_MEDIA_PAUSE:
	if (mPlayer.isPlaying()) {
	mPlayer.pause();
	}
	updatePlayPause();
	return true;
	case KeyEvent.KEYCODE_MEDIA_FAST_FORWARD:
	case KeyEvent.KEYCODE_MEDIA_NEXT:
	case KeyEvent.KEYCODE_MEDIA_PREVIOUS:
	case KeyEvent.KEYCODE_MEDIA_REWIND:
	return true;
	case KeyEvent.KEYCODE_MEDIA_STOP:
	case KeyEvent.KEYCODE_BACK:
	stopPlayback();
	finish();
	return true;
	}
	return super.onKeyDown(keyCode, event);
	}

	/*
	* Wrapper class to help with handing off the MediaPlayer to the next instance
	* of the activity in case of orientation change, without losing any state.
	*/
	private static class PreviewPlayer extends MediaPlayer implements OnPreparedListener {
	AudioPreview mActivity;
	boolean mIsPrepared = false;

	public void setActivity(AudioPreview activity) {
	mActivity = activity;
	setOnPreparedListener(this);
	setOnErrorListener(mActivity);
	setOnCompletionListener(mActivity);
	}

	public void setDataSourceAndPrepare(Uri uri) throws IllegalArgumentException,
	SecurityException, IllegalStateException, IOException {
	setDataSource(mActivity,uri);
	prepareAsync();
	}

	/* (non-Javadoc)
	* @see android.media.MediaPlayer.OnPreparedListener#onPrepared(android.media.MediaPlayer)
	*/
	@Override
	public void onPrepared(MediaPlayer mp) {
	mIsPrepared = true;
	mActivity.onPrepared(mp);
	}

	boolean isPrepared() {
	return mIsPrepared;
	}
	}

	}