当我单击媒体播放器中的列表视图时，正在播放多首歌曲
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【中文标题】当我单击媒体播放器中的列表视图时，正在播放多首歌曲【英文标题】：Multiple songs are playing when I click on listview in mediaplayer 【发布时间】：2017-05-17 06:03:28 【问题描述】：您好，我正在创建音乐播放器应用程序。
我有一个问题，当我点击列表视图时它会播放歌曲。
当我再次单击列表视图时，歌曲正在一起播放。
上一首歌不停。
我关注了许多 tuts 和博客以及 *** 的答案，但没有任何效果。
这是我的 Activity，其中包含歌曲列表视图：-
public class songlist extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener
private ListView lv_songlist;
public Cursor cursor;
private MediaCursorAdapter mediaAdapter = null;
private String currentFile;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.songlist);
lv_songlist = (ListView) findViewById(R.id.songlist);
cursor = getContentResolver().query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null, null, null);
if (null != cursor)
cursor.moveToFirst();
mediaAdapter = new MediaCursorAdapter(this, R.layout.listitem, cursor);
lv_songlist.setAdapter(mediaAdapter);
lv_songlist.setOnItemClickListener(new AdapterView.OnItemClickListener()
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l)
currentFile = (String) view.getTag();
Intent myIntent = new Intent(songlist.this,
now_playing.class);
myIntent.putExtra("song",""+currentFile);
myIntent.putExtra("cursor-position",cursor.getPosition());
startActivity(myIntent);
);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View view)
Intent myIntent = new Intent(songlist.this,
now_playing.class);
myIntent.putExtra("song","");
startActivity(myIntent);
);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
@Override
public void onBackPressed()
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START))
drawer.closeDrawer(GravityCompat.START);
else
super.onBackPressed();
@Override
public boolean onCreateOptionsMenu(Menu menu)
getMenuInflater().inflate(R.menu.songlist, menu);
return true;
@Override
public boolean onOptionsItemSelected(MenuItem item)
int id = item.getItemId();
if (id == R.id.action_settings)
return true;
return super.onOptionsItemSelected(item);
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item)
int id = item.getItemId();
if (id == R.id.nav_camera)
else if (id == R.id.nav_gallery)
else if (id == R.id.nav_slideshow)
else if (id == R.id.nav_manage)
else if (id == R.id.nav_share)
else if (id == R.id.nav_send)
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
private class MediaCursorAdapter extends SimpleCursorAdapter
public MediaCursorAdapter(Context context, int layout, Cursor c)
super(context, layout, c,
new String[]MediaStore.MediaColumns.DISPLAY_NAME, MediaStore.MediaColumns.TITLE, MediaStore.Audio.AudioColumns.DURATION,
new int[]R.id.displayname, R.id.title, R.id.duration);
@Override
public void bindView(View view, Context context, Cursor cursor)
TextView title = (TextView) view.findViewById(R.id.title);
TextView name = (TextView) view.findViewById(R.id.displayname);
TextView duration = (TextView) view.findViewById(R.id.duration);
name.setText(cursor.getString(
cursor.getColumnIndex(MediaStore.MediaColumns.DISPLAY_NAME)));
title.setText(cursor.getString(
cursor.getColumnIndex(MediaStore.MediaColumns.TITLE)));
long durationInMs = Long.parseLong(cursor.getString(
cursor.getColumnIndex(MediaStore.Audio.AudioColumns.DURATION)));
Duration d = new Duration();
String durationInMin = d.convertDuration(durationInMs);
duration.setText("" + durationInMin);
view.setTag(cursor.getString(cursor.getColumnIndex(MediaStore.MediaColumns.DATA)));
@Override
public View newView(Context context, Cursor cursor, ViewGroup parent)
LayoutInflater inflater = LayoutInflater.from(context);
View v = inflater.inflate(R.layout.listitem, parent, false);
bindView(v, context, cursor);
return v;
这是我一起播放歌曲的音乐播放活动：-
public class now_playing extends AppCompatActivity implements View.OnClickListener
private MediaPlayer mp = new MediaPlayer();
private Cursor cursor;
private RelativeLayout rl_album;
private TextView Title_now_playing,duration_now_playing;
private String Title,Duration,currentSong;
private int cursorPosition;
private ImageButton playPrev,playNext,seekFwd,seekBwd;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.now_playing);
setTitle("");
cursor = getContentResolver().query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null, null, null);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
android.support.v7.app.ActionBar mActionBar = getSupportActionBar();
LayoutInflater mInflater = LayoutInflater.from(this);
View mCustomView = mInflater.inflate(R.layout.custom_layout_now_playing_for_action_bar, null);
Title_now_playing = (TextView) mCustomView.findViewById(R.id.title_text);
duration_now_playing = (TextView) findViewById(R.id.duration);
playNext = (ImageButton) findViewById(R.id.playNext);
rl_album = (RelativeLayout) findViewById(R.id.rl_album);
Title_now_playing.setText(Title);
mActionBar.setCustomView(mCustomView);
mActionBar.setDisplayShowCustomEnabled(true);
Intent in = getIntent();
currentSong = in.getStringExtra("song");
cursorPosition = in.getIntExtra("cursor-position",1);
displayDetails();
playNext.setOnClickListener(this);
void displayDetails()
mp.stop();
mp.reset();
if(!currentSong.equals(""))
cursor.move(cursorPosition+1);
try
mp.setDataSource(currentSong);
mp.prepare();
mp.start();
catch (IllegalArgumentException e)
e.printStackTrace();
catch (IllegalStateException e)
e.printStackTrace();
catch (IOException e)
e.printStackTrace();
Title = cursor.getString(cursor.getColumnIndex(MediaStore.MediaColumns.DISPLAY_NAME));
int duration = cursor.getColumnIndex
(MediaStore.Audio.Media.DURATION);
long SongDuration = cursor.getLong(duration);
com.example.davda.musicmain.Duration d = new Duration();
Duration = d.convertDuration(SongDuration);
duration_now_playing.setText(Duration);
Title_now_playing.setText(Title);
ContentResolver musicResolve = getContentResolver();
Uri smusicUri = MediaStore.Audio.Albums.EXTERNAL_CONTENT_URI;
Cursor musicCursorTogetAlbum =musicResolve.query(smusicUri,null //should use where clause(_ID==albumid)
,null, null, null);
musicCursorTogetAlbum.move(cursorPosition+1); //i put only one song in my external storage to keep things simple;
try
int x = musicCursorTogetAlbum.getColumnIndex(MediaStore.Audio.Albums.ALBUM_ART);
String thisArt = musicCursorTogetAlbum.getString(x);
Bitmap bm = BitmapFactory.decodeFile(thisArt);
Drawable dr = new BitmapDrawable(getResources(), bm);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN)
rl_album.setBackground(dr);
catch (RuntimeException re)
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN)
rl_album.setBackgroundColor(Color.BLACK);
public boolean onCreateOptionsMenu(Menu menu)
getMenuInflater().inflate(R.menu.now_playing_menu, menu);
return true;
@Override
public boolean onOptionsItemSelected(MenuItem item)
switch (item.getItemId())
case android.R.id.home:
Intent myIntent = new Intent(now_playing.this,
songlist.class);
startActivity(myIntent);
return true;
case R.id.custom_equalizer:
Toast.makeText(now_playing.this,"Custom Equalizer button pressed. Good broooooooooooooooooooooo...",Toast.LENGTH_LONG).show();
return true;
return super.onOptionsItemSelected(item);
@Override
public void onClick(View v)
switch (v.getId())
case R.id.playNext:
cursor.moveToNext();
currentSong = cursor.getString(cursor.getColumnIndex(MediaStore.MediaColumns.DATA));
displayDetails();
【问题讨论】：
不需要每次都创建新的媒体播放器实例，使用单个实例，当你停止音乐时，你也应该使用 mediaPlayer.release(); 释放实例； 它现在可以通过将 MediaPlayer 设为静态来工作。谢谢@Rucha Bhatt 【参考方案1】：因为您每次都在活动中创建新的 MediaPlayer 实例。
使用单个 MediaPlayer 实例。
创建一个单例类并从那里使用 MediaPlayer。
或者您可以在您的 ListView Activity 中将 MediaPlayer 设为公共静态。
public static MediaPlayer mp = new MediaPlayer();
并在您的 now_playing Activity
中使用此 MediaPlayer【讨论】：
【参考方案2】：我遇到了同样的问题并像这样修复了。更改为您的项目要求。
全局声明您的mediaPlayer 实例
static MediaPlayer mediaPlayer = new MediaPlayer();
创建您的AudioManager 和音量设置（注意：我使用最大音量播放声音）：
AudioManager mAudioManager = (AudioManager) getSystemService(AUDIO_SERVICE);
int maxVolume = mAudioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, maxVolume, AudioManager.FLAG_PLAY_SOUND);
然后将此代码放在您的播放按钮 onClick 上
try
if (mediaPlayer != null)
if (mediaPlayer.isPlaying())
mediaPlayer.stop();
mediaPlayer.release();
mediaPlayer = null;
mediaPlayer.setDataSource(filePath);
mediaPlayer.prepare();
mediaPlayer.start();
catch (IOException e)
e.printStackTrace();
【讨论】：
非常感谢先生，在静态的帮助下它工作了。以上是关于当我单击媒体播放器中的列表视图时，正在播放多首歌曲的主要内容，如果未能解决你的问题，请参考以下文章
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