我在Android音频播放器活动中播放声音。当我暂停那个活动时，声音继续在后台播放。当我恢复音频播放器活动时，我想停止那种声音。 这是我的代码.. 任何人都可以帮助我如何做到这一点。非常感谢任何帮助，谢谢你:)。
public class AndroidBuildingMusicPlayerActivity extends Activity implements
OnCompletionListener, SeekBar.OnSeekBarChangeListener {
private ImageButton btnPlay;
private ImageButton btnForward;
private ImageButton btnBackward;
// private ImageButton btnNext;
// private ImageButton btnPrevious;
// private ImageButton btnPrevious;
private ImageButton btnPlaylist;
private ImageView songimg;
// private ImageButton btnRepeat;
// private ImageButton btnShuffle;
private SeekBar songProgressBar;
private TextView songTitleLabel;
private TextView songCurrentDurationLabel;
private TextView songTotalDurationLabel;
// Media Player
private 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 = 0;
private boolean isShuffle = false;
private boolean isRepeat = false;
private ArrayList<HashMap<String, String>> songsList = new ArrayList<HashMap<String, String>>();
String[] stringArray = new String[4];
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_mediaplayer);
// 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);
songimg = (ImageView) findViewById(R.id.songimg);
// btnShuffle = (ImageButton) findViewById(R.id.btnShuffle);
btnPlaylist = (ImageButton) findViewById(R.id.btnPlaylist);
songProgressBar = (SeekBar) findViewById(R.id.songProgressBar);
songTitleLabel = (TextView) findViewById(R.id.songTitle);
songCurrentDurationLabel = (TextView) findViewById(R.id.songCurrentDurationLabel);
songTotalDurationLabel = (TextView) findViewById(R.id.songTotalDurationLabel);
// 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();
final String[] stringArray = getIntent().getStringArrayExtra("string-array");
// By default play first song
playSong(stringArray[0]);
songTitleLabel.setText(stringArray[1]);
new DownloadImageTask(songimg).execute(stringArray[2]);
btnPlaylist.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
final String[] option = new String[] {"Share",
"Stop" };
ArrayAdapter<String> adapters = new ArrayAdapter<String>(
AndroidBuildingMusicPlayerActivity.this,
android.R.layout.select_dialog_item, option);
AlertDialog.Builder builder = new AlertDialog.Builder(
AndroidBuildingMusicPlayerActivity.this);
builder.setTitle("Choose Action");
builder.setAdapter(adapters,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
// TODO Auto-generated method stub
if (which == 1) {
mp.stop();
finish();
}
if (which == 0) {
Intent browserIntent = new Intent(
Intent.ACTION_SEND);
browserIntent.setType("text/plain");
browserIntent.putExtra(
android.content.Intent.EXTRA_TEXT,
stringArray[3]);
// ,
// Uri.parse("https://www.youtube.com/watch?v="+ids.get(mPosition)));
startActivity(Intent.createChooser(
browserIntent, "Share Song Link"));
}
}
});
final AlertDialog dialog = builder.create();
dialog.show();
}
});
/**
* 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) {
// 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 {
// Resume song
if (mp != null) {
mp.start();
// Changing button image to pause button
btnPlay.setImageResource(R.drawable.btn_pause);
}
}
}
});
/**
* Forward button click event Forwards song specified seconds
* */
btnForward.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// get current song position
int currentPosition = mp.getCurrentPosition();
// check if seekForward time is lesser than song duration
if (currentPosition + seekForwardTime <= mp.getDuration()) {
// forward song
mp.seekTo(currentPosition + seekForwardTime);
} else {
// forward to end position
mp.seekTo(mp.getDuration());
}
}
});
/**
* Backward button click event Backward song to specified seconds
* */
btnBackward.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// get current song position
int currentPosition = mp.getCurrentPosition();
// check if seekBackward time is greater than 0 sec
if (currentPosition - seekBackwardTime >= 0) {
// forward song
mp.seekTo(currentPosition - seekBackwardTime);
} else {
// backward to starting position
mp.seekTo(0);
}
}
});
}
/**
* Receiving song index from playlist view and play the song
* */
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == 100) {
currentSongIndex = data.getExtras().getInt("songIndex");
// play selected song
playSong(stringArray[0]);
}
}
/**
* Function to play a song
*
* @param songIndex
* - index of song
* */
public void playSong(String songpath) {
// Play song
try {
mp.reset();
mp.setDataSource(songpath);
mp.prepare();
mp.start();
// Displaying Song title
// String songTitle = songsList.get(songIndex).get("songTitle");
// songTitleLabel.setText(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();
}
}
/**
* Update timer on seekbar
* */
public void updateProgressBar() {
mHandler.postDelayed(mUpdateTimeTask, 100);
}
/**
* Background Runnable thread
* */
private Runnable mUpdateTimeTask = new Runnable() {
public void run() {
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.removeCallbacks(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(stringArray[0]);
} else if (isShuffle) {
// shuffle is on - play a random song
Random rand = new Random();
currentSongIndex = rand.nextInt((songsList.size() - 1) - 0 + 1) + 0;
playSong(stringArray[0]);
} else {
// no repeat or shuffle ON - play next song
if (currentSongIndex < (songsList.size() - 1)) {
playSong(stringArray[0]);
currentSongIndex = currentSongIndex + 1;
} else {
// play first song
playSong(stringArray[0]);
currentSongIndex = 0;
}
}
}
@Override
public void onDestroy() {
super.onDestroy();
//mp.stop();
}
class DownloadImageTask extends AsyncTask<String, Void, Bitmap> {
ImageView bmImage;
public DownloadImageTask(ImageView bmImage) {
this.bmImage = bmImage;
}
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
// pd.show();
}
protected Bitmap doInBackground(String... urls) {
String urldisplay = urls[0];
Bitmap mIcon11 = null;
try {
InputStream in = new java.net.URL(urldisplay).openStream();
mIcon11 = BitmapFactory.decodeStream(in);
} catch (Exception e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return mIcon11;
}
@Override
protected void onPostExecute(Bitmap result) {
super.onPostExecute(result);
// pd.dismiss();
bmImage.setImageBitmap(result);
}
}
}
答案 0 :(得分：0)
尝试：覆盖onStop（）和onRestart（）
@Override
protected void onStop() {
super.onStop();
if (mp.isPlaying()) {
mp.stop();
// or mp.pause();
}
}
@Override
public void onRestart() {
super.onRestart();
if (mp == null) {
//create mp from current song, for example
mp = MediaPlayer.create(AndroidBuildingMusicPlayerActivity.this, currentSong);
}
mp.start();
}
编辑：
尝试：
@Override
protected void onPause() {
super.onPause();
try{
if (mp.isPlaying()) {
mp.pause();
}
}catch(Exception we){
we.printStackTrace();
}
}
@Override
protected void onResume() {
super.onResume();
try{
mp.start();
}catch(Exception we){
we.printStackTrace();
}
}
答案 1 :(得分：0)
你应该使用AUDIO FOCUS和onfocuschangelistener来解决你的问题。