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私は曲の再生を制御する音楽プレーヤーのアクティビティを持っています。私はオーディオフォーカスの管理についてのドキュメントを読んで、btnPlayとplaySongの機能で実装しました。ここに私のコードは次のとおりです。オーディオフォーカスの変更が機能していません
public class MusicPlayerActivity extends Activity implements MediaPlayer.OnCompletionListener, SeekBar.OnSeekBarChangeListener {
private boolean notRunning = false;
private boolean wasRunning = false;
private BroadcastReceiver receiver;
private static final int NOTIFICATION_ID = 69;
private static final String TAG = "museNotification";
private ImageButton btnPlay;
private ImageButton btnForward;
private ImageButton btnBackward;
private ImageButton btnNext;
private ImageButton btnPrevious;
private ImageButton btnPlaylist;
private ImageButton btnRepeat;
private ImageButton btnShuffle;
private SeekBar songProgressBar;
private TextView songTitleLabel;
private TextView songCurrentDurationLabel;
private TextView songTotalDurationLabel;
// Media Player
private static MediaPlayer mp;
// Handler to update UI timer, progress bar etc,.
private Handler mHandler = new Handler();;
private SongsManager songManager;
private Utilities utils;
private int seekForwardTime = 5000; // 5000 milliseconds
private int seekBackwardTime = 5000; // 5000 milliseconds
private int currentSongIndex = 6;
private boolean isShuffle = false;
private boolean isRepeat = false;
private ArrayList<HashMap<String, String>> songsList = new ArrayList<HashMap<String, String>>();
private ViewPager viewPager;
private int remember = 223;
public static String songName="Choose a song";
@Override
public void onResume() {
super.onResume();
NotificationManager notificationManager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.cancelAll();
if (mp.isPlaying()) {
if (mp != null) {
btnPlay.setImageResource(R.drawable.btn_pause);
}
else {
if (mp != null)
btnPlay.setImageResource(R.drawable.btn_play);}
}
else
btnPlay.setImageResource(R.drawable.btn_play);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_music_player);
// All player buttons
btnPlay = (ImageButton) findViewById(R.id.btnPlay);
// btnForward = (ImageButton) findViewById(R.id.btnForward);
//btnBackward = (ImageButton) findViewById(R.id.btnBackward);
btnNext = (ImageButton) findViewById(R.id.btnNext);
btnPrevious = (ImageButton) findViewById(R.id.btnPrevious);
btnPlaylist = (ImageButton) findViewById(R.id.btnPlaylist);
btnRepeat = (ImageButton) findViewById(R.id.btnRepeat);
btnShuffle = (ImageButton) findViewById(R.id.btnShuffle);
songProgressBar = (SeekBar) findViewById(R.id.songProgressBar);
songTitleLabel = (TextView) findViewById(R.id.songTitle);
songCurrentDurationLabel = (TextView) findViewById(R.id.songCurrentDurationLabel);
songTotalDurationLabel = (TextView) findViewById(R.id.songTotalDurationLabel);
viewPager = (ViewPager)findViewById(R.id.viewPager);
// Mediaplayer
mp = new MediaPlayer();
songManager = new SongsManager();
utils = new Utilities();
// Listeners
songProgressBar.setOnSeekBarChangeListener(this); // Important
mp.setOnCompletionListener(this); // Important
// Getting all songs list
songsList = songManager.getPlayList(this);
/**
* Play button click event
* plays a song and changes button to pause image
* pauses a song and changes button to play image
* */
btnPlay.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// if (result == AudioManager.AUDIOFOCUS_REQUEST_GRANTED){
// check for already playing
if (mp.isPlaying()) {
if (mp != null) {
mp.pause();
// Changing button image to play button
btnPlay.setImageResource(R.drawable.btn_play);
}
}
else {
//RISH
Context mContext = getApplicationContext();
AudioManager am = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);
AudioManager.OnAudioFocusChangeListener afChangeListener = new AudioManager.OnAudioFocusChangeListener() {
public void onAudioFocusChange(int focusChange) {
if (focusChange == AudioManager.AUDIOFOCUS_LOSS) {
notRunning = true;
mp.pause();
length = mp.getCurrentPosition(); //lol
}
}
};
// Request audio focus for playback
int result = am.requestAudioFocus(afChangeListener,
// Use the music stream.
AudioManager.STREAM_MUSIC,
// Request permanent focus.
AudioManager.AUDIOFOCUS_GAIN_TRANSIENT_EXCLUSIVE);
//RISH
// Resume song
if (mp != null) {
mp.start();
// Changing button image to pause button
btnPlay.setImageResource(R.drawable.btn_pause);
}
}
//}
}
});
/**
* Next button click event
* Plays next song by taking currentSongIndex + 1
* */
btnNext.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
if(isShuffle){
// shuffle is on - play a random song
Random rand = new Random();
remember = currentSongIndex;
currentSongIndex = rand.nextInt((songsList.size() - 1) - 0 + 1) + 0;
playSong(currentSongIndex);
} else{
// no repeat or shuffle ON - play next song
if(currentSongIndex < (songsList.size() - 1)){
playSong(currentSongIndex + 1);
currentSongIndex = currentSongIndex + 1;
}else{
// play first song
playSong(0);
currentSongIndex = 0;
}
}
}
});
/**
* Back button click event
* Plays previous song by currentSongIndex - 1
* */
btnPrevious.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
if(isShuffle){
if(remember!=223)
{currentSongIndex = remember;
remember=223;}
else
{Random rand = new Random();
currentSongIndex = rand.nextInt((songsList.size() - 1) - 0 + 1) + 0;
playSong(currentSongIndex);}
playSong(currentSongIndex);
}
else {
if (currentSongIndex > 0) {
playSong(
currentSongIndex - 1);
currentSongIndex = currentSongIndex - 1;
} else {
// play last song
playSong(songsList.size() - 1);
currentSongIndex = songsList.size() - 1;
}
}
}
});
/**
* Button Click event for Repeat button
* Enables repeat flag to true
* */
btnRepeat.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
if(isRepeat){
isRepeat = false;
Toast.makeText(getApplicationContext(), "Repeat Turned OFF", Toast.LENGTH_SHORT).show();
btnRepeat.setImageResource(R.drawable.btn_repeat);
}else{
// make repeat to true
isRepeat = true;
Toast.makeText(getApplicationContext(), "Single Repeat Turned ON", Toast.LENGTH_SHORT).show();
// make shuffle to false
isShuffle = false;
btnRepeat.setImageResource(R.drawable.btn_repeat_focused);
btnShuffle.setImageResource(R.drawable.btn_shuffle);
}
}
});
/**
* Button Click event for Shuffle button
* Enables shuffle flag to true
* */
btnShuffle.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
if(isShuffle){
isShuffle = false;
Toast.makeText(getApplicationContext(), "Shuffle is OFF", Toast.LENGTH_SHORT).show();
btnShuffle.setImageResource(R.drawable.btn_shuffle);
}else{
// make repeat to true
isShuffle= true;
Toast.makeText(getApplicationContext(), "Shuffle is ON", Toast.LENGTH_SHORT).show();
// make shuffle to false
isRepeat = false;
btnShuffle.setImageResource(R.drawable.btn_shuffle_focused);
btnRepeat.setImageResource(R.drawable.btn_repeat);
}
}
});
/**
* Button Click event for Play list click event
* Launches list activity which displays list of songs
* */
btnPlaylist.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
Intent i = new Intent(getApplicationContext(), MainActivity.class);
startActivity(i);
//viewPager.setCurrentItem(0);
}
});
Bundle extras = getIntent().getExtras();
if(extras!=null){
mp.reset();
currentSongIndex = extras.getInt("songPath");
// play selected song
if(mp != null)
if(mp.isPlaying())
{
mp.prepareAsync();
mp.start();
mp.seekTo(0);
// start your new song
}else{
playSong(currentSongIndex);
// start your new song
}
}
}
/**
* Function to play a song
* */
int length;
public void playSong(int songIndex){
notRunning=false;
//Rish -- THIS BLOCK STOPS MUSIC IF ANOTHER APP GETS THE FOCUS OF MEDIAPLAYER
Context mContext = getApplicationContext();
AudioManager am = (AudioManager)mContext.getSystemService(Context.AUDIO_SERVICE);
AudioManager.OnAudioFocusChangeListener afChangeListener = new AudioManager.OnAudioFocusChangeListener() {
public void onAudioFocusChange(int focusChange) {
if (focusChange == AudioManager.AUDIOFOCUS_LOSS_TRANSIENT){
btnPlay.setImageResource(R.drawable.btn_play);
notRunning=true;
mp.pause();
length = mp.getCurrentPosition(); //lol
} else if (focusChange == AudioManager.AUDIOFOCUS_GAIN) {
notRunning=false;
mp.seekTo(length);//lol
mp.start();
} else if (focusChange == AudioManager.AUDIOFOCUS_LOSS) {
mp.pause();
notRunning=true;
length = mp.getCurrentPosition(); //lol
}
}
};
// Request audio focus for playback
int result = am.requestAudioFocus(afChangeListener,
// Use the music stream.
AudioManager.STREAM_MUSIC,
// Request permanent focus.
AudioManager.AUDIOFOCUS_GAIN);
if (result == AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {
// Play song
try {
mp.reset();
mp.setDataSource(songsList.get(songIndex).get("songPath"));
mp.prepare();
mp.start();
// Displaying Song title
String songTitle = songsList.get(songIndex).get("songTitle");
songTitleLabel.setText(songTitle);
// setNotification(songTitle);
songName =songTitle;
// Changing Button Image to pause image
btnPlay.setImageResource(R.drawable.btn_pause);
// set Progress bar values
songProgressBar.setProgress(0);
songProgressBar.setMax(100);
// Updating progress bar
updateProgressBar();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
//Setting miniPlayer that is displayed in the bottom of main activity
Intent i = new Intent(getApplicationContext(),MainActivity.class);
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK| Intent.FLAG_ACTIVITY_SINGLE_TOP);
i.putExtra("songTitle",songName);
i.setAction("dummy3");
//Setting miniPlayer that is displayed in the bottom of main activity
}
//Rish
/**
* Update timer on seekbar
* */
public void updateProgressBar() {
mHandler.postDelayed(mUpdateTimeTask, 100);
}
/**
* Background Runnable thread
* */
private Runnable mUpdateTimeTask = new Runnable() {
public void run() {
if((mp != null)) { //Attempting to prevent app crash on swipe
long totalDuration = mp.getDuration();
long currentDuration = mp.getCurrentPosition();
// Displaying Total Duration time
songTotalDurationLabel.setText("" + utils.milliSecondsToTimer(totalDuration));
// Displaying time completed playing
songCurrentDurationLabel.setText("" + utils.milliSecondsToTimer(currentDuration));
// Updating progress bar
int progress = (int) (utils.getProgressPercentage(currentDuration, totalDuration));
//Log.d("Progress", ""+progress);
songProgressBar.setProgress(progress);
// Running this thread after 100 milliseconds
mHandler.postDelayed(this, 100);
}
}
};
/**
*
* */
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromTouch) {
}
/**
* When user starts moving the progress handler
* */
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
// remove message Handler from updating progress bar
// mHandler.removeCallbacks(mUpdateTimeTask);
}
/**
* When user stops moving the progress hanlder
* */
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
// mHandler.removeCallbacksAndMessages(mUpdateTimeTask);
int totalDuration = mp.getDuration();
int currentPosition = utils.progressToTimer(seekBar.getProgress(), totalDuration);
// forward or backward to certain seconds
mp.seekTo(currentPosition);
// update timer progress again
updateProgressBar();
}
/**
* On Song Playing completed
* if repeat is ON play same song again
* if shuffle is ON play random song
* */
@Override
public void onCompletion(MediaPlayer arg0) {
// check for repeat is ON or OFF
if(isRepeat){
// repeat is on play same song again
playSong(currentSongIndex);
} else if(isShuffle){
// shuffle is on - play a random song
remember = currentSongIndex;
Random rand = new Random();
currentSongIndex = rand.nextInt((songsList.size() - 1) - 0 + 1) + 0;
playSong(currentSongIndex);
} else{
// no repeat or shuffle ON - play next song
if(currentSongIndex < (songsList.size() - 1)){
playSong(currentSongIndex + 1);
currentSongIndex = currentSongIndex + 1;
}else{
// play first song
playSong(0);
currentSongIndex = 0;
}
}
}
/*
//The method below minimizes the app if Back key is pressed ; i.e same as the method below
public boolean onKeyDown(int keyCode, KeyEvent event)
{
setNotification(songName);//Notification start
Intent i = new Intent(getApplicationContext(), MainActivity.class);
startActivity(i);
return super.onKeyDown(keyCode, event);
}
*/
//Above method works same as this
@Override
public void onBackPressed(){
Intent i = new Intent(getApplicationContext(), MainActivity.class);
startActivity(i);
//super.onBackPressed();
}
@Override
public void onPause(){
setNotification(songName);
startService(new Intent(this, MyService.class)); //trying to cancel notification on app swipe
super.onPause();
}
@Override
public void onDestroy(){
if (receiver != null) {
unregisterReceiver(receiver);
receiver = null;
}
super.onDestroy();
mp.release();
}
//NOTIFICATION START
static @SuppressWarnings("deprecation")
Notification notification = new Notification(R.drawable.ic_launcher, null, System.currentTimeMillis());
@SuppressLint("NewApi")
public void setNotification(String songName) {
String ns = Context.NOTIFICATION_SERVICE;
NotificationManager notificationManager = (NotificationManager)getSystemService(ns);
RemoteViews notificationView = new RemoteViews(getPackageName(), R.layout.notification_mediacontroller);
notificationView.setTextViewText(R.id.textView1, songName);
Notification.Builder mNotifyBuilder = new Notification.Builder(this);
notification = mNotifyBuilder.setContentTitle("some string")
.setContentText("Slide down on note to expand")
.setSmallIcon(R.drawable.ic_launcher)
// .setAutoCancel(true)
// .setLargeIcon()
.build();
notification.contentView = notificationView;
//the intent that is started when the notification is clicked (works)
Intent notificationIntent = new Intent(this, MusicPlayerActivity.class);
//set some dummy action on the Intent, otherwise extras are dropped And cause problems like unnecessary new instance of activity
notificationIntent.setAction("dummy");
notificationIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
PendingIntent pendingNotificationIntent = PendingIntent.getActivity(this, 0, notificationIntent, PendingIntent.FLAG_ONE_SHOT);
notification.contentView = notificationView;
notification.contentIntent = pendingNotificationIntent;
notification.flags |= Notification.FLAG_NO_CLEAR;
notification.flags |= Notification.PRIORITY_MAX;
notification.flags |= Notification.FLAG_ONGOING_EVENT;//Dont know why using this flag.
notification.flags |= Notification.FLAG_AUTO_CANCEL;
//this is the intent that is supposed to be called when the button is clicked
Intent switchIntent = new Intent("com.dmmet.musicplayer.ACTION_PLAY");
PendingIntent pendingSwitchIntent = PendingIntent.getBroadcast(this, 0, switchIntent, PendingIntent.FLAG_UPDATE_CURRENT);
notificationView.setOnClickPendingIntent(R.id.btnPlay2, pendingSwitchIntent);
notificationManager.notify(TAG,NOTIFICATION_ID, notification);
Intent closeIntent = new Intent("com.dmmet.musicplayer.ACTION_CLOSE");
PendingIntent pendingCloseIntent = PendingIntent.getBroadcast(this, 0, closeIntent, 0);
notificationView.setOnClickPendingIntent(R.id.btnClose, pendingCloseIntent);
notificationManager.notify(TAG,NOTIFICATION_ID, notification);
Intent nextIntent = new Intent("com.dmmet.musicplayer.ACTION_NEXT");
PendingIntent pendingNextIntent = PendingIntent.getBroadcast(this, 0, nextIntent, 0);
notificationView.setOnClickPendingIntent(R.id.btnNext, pendingNextIntent);
notificationManager.notify(TAG,NOTIFICATION_ID, notification);
Intent previousIntent = new Intent("com.dmmet.musicplayer.ACTION_PREVIOUS");
PendingIntent pendingPreviousIntent = PendingIntent.getBroadcast(this, 0, previousIntent, 0);
notificationView.setOnClickPendingIntent(R.id.btnPrevious, pendingPreviousIntent);
notificationManager.notify(TAG,NOTIFICATION_ID, notification);
}
//NOTIFICATION START
public static class MyService extends Service {
@Override
public void onCreate()
{
super.onCreate();
}
@Override
public void onTaskRemoved(Intent rootIntent){
NotificationManager notificationManager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.cancel(TAG,NOTIFICATION_ID);
notificationManager.cancelAll();
// mp.release();
mp = null; //Trying to avoid app crash on swipe
//stop service
stopSelf();
}
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
}
}
他の音楽プレーヤーのように動作することになっている、すなわち：これらの規則は、次のとおりです。他のいくつかのアプリがオーディオを再生している場合 の1-ゲインオーディオフォーカスを。 2他のアプリが既にオーディオを再生しているときにオーディオを再生しようとすると、オーディオフォーカスが失われます。 新しい曲が再生されたときに前の再生曲を3つ停止します。 4-電話が鳴ったら、曲を一時停止します。
あなたがPhoneStateListenerを使用して通話状態の変化を聞くことができたときに電話が鳴る曲を一時停止するには...この問題を解決するために