我已经使用滑动（带标签）为Android创建了一个音乐播放器应用程序。每当我切换到另一个片段时，当音乐正在播放并尝试从列表中播放网络流时，我收到此错误：
FATAL EXCEPTION: main
Process: com.example.npopa.musicplayern, PID: 15665
java.lang.IllegalStateException
at android.media.MediaPlayer._setAudioStreamType(Native Method)
at android.media.MediaPlayer.setAudioStreamType(MediaPlayer.java:1868)
at com.example.npopa.musicplayern.MusicService.initStreamPlayer(MusicService.java:72)
at com.example.npopa.musicplayern.RadioStreaming$2.onItemClick(RadioStreaming.java:88)
这是我的代码：
package com.example.npopa.musicplayern;
import android.content.Context;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Toast;
import com.example.npopa.musicplayern.adapter.RadioAdapter;
import com.example.npopa.musicplayern.helpers.Streams;
import java.util.ArrayList;
public class RadioStreaming extends Fragment {
private EditText et_streamNameRS, et_streamUrlRS;
private static ArrayList<Streams> m_streamsList;
private DBHelper m_myDBHelp;
private MusicService m_musicSrv;
public static Context m_context;
private ListView m_listView;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.radio_streaming, container, false);
m_context = getContext();
et_streamNameRS = (EditText) rootView.findViewById(R.id.et_streamNameRS);
et_streamUrlRS = (EditText) rootView.findViewById(R.id.et_streamUrlRS);
Button bt_addStreamRS = (Button) rootView.findViewById(R.id.bt_addStreamRS);
m_listView = (ListView) rootView.findViewById(R.id.stream_listRS);
m_myDBHelp = new DBHelper();
m_streamsList = m_myDBHelp.selectStreamsList();
if (m_streamsList.isEmpty()) {
Toast.makeText(RadioStreaming.m_context, "There's no streams in DB. ADD streams!", Toast.LENGTH_LONG).show();
}
Log.d("RadioStreaming", " -------- TAG select m_streamsList ------" + m_streamsList.toString());
RadioAdapter adapt = new RadioAdapter(m_context, m_streamsList);
m_listView.setAdapter(adapt);
bt_addStreamRS.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String name = et_streamNameRS.getText().toString();
String url = et_streamUrlRS.getText().toString();
m_myDBHelp.insertStreamIntoDB(name, url);
m_listView.invalidate();
m_streamsList = null;
m_streamsList = m_myDBHelp.selectStreamsList();
RadioAdapter adapt2 = new RadioAdapter(m_context, m_streamsList);
m_listView.setAdapter(adapt2);
et_streamNameRS.setText("");
et_streamUrlRS.setText("");
}
});
m_listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
if (!Functions.checkNetworkState(m_context)) {
Toast.makeText(getContext(), "Enable WIFI or Mobile Data!", Toast.LENGTH_LONG).show();
} else {
m_musicSrv = MusicService.getInstance();
if (MusicService.m_player != null) {
if (m_musicSrv.isPlaying()) {
if (m_musicSrv.is_playing_music) {
new SongDetails().stopHandler();
MusicService.m_player.stop();
MusicService.m_player.reset(); //It requires again setDataSource for player object.
// MusicService.m_player.stop();
MusicService.m_player.release();
// MusicService.m_player = null; // Initilize to null so it can be used later
m_musicSrv.initStreamPlayer(m_context);
m_musicSrv.setStreamList(m_streamsList);
m_musicSrv.setStream(Integer.parseInt(view.getTag().toString()));
m_musicSrv.playStream();
}
else {
MusicService.m_player.reset();
m_musicSrv.initStreamPlayer(m_context);
m_musicSrv.setStreamList(m_streamsList);
m_musicSrv.setStream(Integer.parseInt(view.getTag().toString()));
m_musicSrv.playStream();
}
}
else {
m_musicSrv.initStreamPlayer(m_context);
m_musicSrv.setStreamList(m_streamsList);
m_musicSrv.setStream(Integer.parseInt(view.getTag().toString()));
m_musicSrv.playStream();
}
}
else {
m_musicSrv.initStreamPlayer(m_context);
m_musicSrv.setStreamList(m_streamsList);
m_musicSrv.setStream(Integer.parseInt(view.getTag().toString()));
m_musicSrv.playStream();
}
}
}
});
return rootView;
}
}
package com.example.npopa.musicplayern;
import android.content.ContentUris;
import android.content.Context;
import android.graphics.Bitmap;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.PowerManager;
import android.util.Log;
import android.widget.Toast;
import com.example.npopa.musicplayern.helpers.Streams;
import com.example.npopa.musicplayern.helpers.Song;
import java.util.ArrayList;
import java.util.Random;
public class MusicService implements MediaPlayer.OnCompletionListener, MediaPlayer.OnPreparedListener, MediaPlayer.OnErrorListener, MediaPlayer.OnBufferingUpdateListener {
public static MediaPlayer m_player;
public static String m_songTitle = "";
public static String m_artistName = "";
private static String m_streamNAME, m_streamURL;
public static Bitmap m_albumImageMS;
public static ArrayList<Song> m_songs;
public static ArrayList<Streams> m_streams;
public static int m_songPosn;
public static int m_streamPosition;
private static int m_streamID;
public static boolean m_shuffle = false;
public static boolean m_repeat = false;
public boolean is_playing_music = false;
public boolean is_playing_streams = false;
private Random m_rand;
private DBHelper m_db;
private static MusicService myService = new MusicService();
// a private Constructor prevents any other class from instantiating
private MusicService() {
}
public static MusicService getInstance() {
if (myService == null) {
myService = new MusicService();
}
return myService;
}
public void initSongPlayer(Context context) {
m_songs = new ArrayList<Song>();
m_songPosn = 0;
if (m_player == null) {
m_player = new MediaPlayer();
}
m_player.setWakeMode(context, PowerManager.PARTIAL_WAKE_LOCK);
m_player.setAudioStreamType(AudioManager.STREAM_MUSIC);
m_player.setOnPreparedListener(this);
m_player.setOnCompletionListener(this);
m_player.setOnErrorListener(this);
}
public void initStreamPlayer(Context context) {
m_streams = new ArrayList<Streams>();
m_streamPosition = 0;
if (m_player == null) {
m_player = new MediaPlayer();
}
m_player.setOnPreparedListener(this);
m_player.setOnBufferingUpdateListener(this);
m_player.setOnErrorListener(this);
m_player.setWakeMode(context, PowerManager.PARTIAL_WAKE_LOCK);
m_player.setAudioStreamType(AudioManager.STREAM_MUSIC);
}
public void setSong(int songIndex) {
m_songPosn = songIndex;
}
public void setSongList(ArrayList<Song> theSongs) {
Log.d("MusicService", "setSongList() - playlist nou marime: " + theSongs.size());
if (theSongs.size() > 0){
m_songs = theSongs;
m_db = new DBHelper();
m_db.deleteAllSongsPlaylist();
m_db.setSongsLastPlaylist(m_songs);
}
}
public void setStream(int streamIndex) {
m_streamPosition = streamIndex;
}
public void setStreamList(ArrayList<Streams> theStreams) {
m_streams = theStreams;
}
public void playSong(Context context) {
if(m_songs.size() == 0) {
Log.d("MusicService", "playSong() - playlist 0 elemente");
}
else {
is_playing_music = true;
is_playing_streams = false;
m_player.reset();
Song playSong = m_songs.get(m_songPosn);
m_songTitle = playSong.getTitle();
m_artistName = playSong.getArtist();
m_albumImageMS = playSong.getAlbumImage();
long currSong = playSong.getID();
Log.d("MusicService", "---------------------CURRENT SONG ID " + String.valueOf(currSong));
Uri trackUri = ContentUris.withAppendedId(android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, currSong);
try {
m_player.setDataSource(context, trackUri);
} catch (Exception e) {
Log.e("MusicService", "Error setting data source", e);
}
m_player.prepareAsync();
m_db = new DBHelper();
m_db.updatePlayerInfo(String.valueOf(currSong), 1);
}
}
public void playStream() {
is_playing_music = false;
is_playing_streams = true;
m_player.reset();
Streams currStream = m_streams.get(m_streamPosition);
m_streamID = currStream.getId();
m_streamNAME = currStream.getName();
m_streamURL = currStream.getUrl();
try { // http://usa8-vn.mixstream.net:8138
m_player.setDataSource(m_streamURL);
Log.d("MusicService", "------------------ playStream() ---------------------" + m_streamURL);
} catch (Exception e) {
// e.printStackTrace();
Log.d("MusicService", "---------- Error setting stream data source", e);
}
m_player.prepareAsync();
DBHelper dbhelp = new DBHelper();
dbhelp.updatePlayerInfo(String.valueOf(m_streamID), 0);
}
public Bitmap getAlbumImageMS() {
return m_albumImageMS;
}
public String getMusicTitle() {
return m_songTitle;
}
public String getMusicArtist() {
return m_artistName;
}
public int getCurrentPosition() {
return m_player.getCurrentPosition();
}
public int getDuration() {
return m_player.getDuration();
}
public boolean isPlaying() {
if (m_player == null){
return false;
}
else {
return m_player.isPlaying();
}
}
public void seekTO(int posn) {
m_player.seekTo(posn);
}
@Override
public boolean onError(MediaPlayer mp, int what, int extra) {
if (is_playing_streams) {
Toast.makeText(MainActivity.m_context, "Playback Error - INVALID URL", Toast.LENGTH_LONG).show();
}
Log.v("MusicService", "Playback Error");
mp.reset();
return false;
}
@Override
public void onCompletion(MediaPlayer mp) {
if (m_player.getCurrentPosition() > 0) {
mp.reset();
playNextSong();
}
}
@Override
public void onPrepared(MediaPlayer mp) {
mp.start();
if (is_playing_music) {
Log.d("MusicService", "---------- Playing MUSIC--- :" + getMusicTitle() + " - - by - - " + getMusicArtist());
}
else if (is_playing_streams) {
Toast.makeText(MainActivity.m_context, "Playing STREAM:" + m_streamNAME + " from " + m_streamURL, Toast.LENGTH_LONG).show();
Log.d("MusicService", "---------- Playing STREAM:" + m_streamNAME + " from " + m_streamURL);
}
}
@Override
public void onBufferingUpdate(MediaPlayer mediaPlayer, int percent) {
Log.d("MusicService", "---------- Buffering " + percent);
Toast.makeText(MainActivity.m_context, "Buffering: " + percent, Toast.LENGTH_LONG).show();
}
public void playNextSong() {
m_rand = new Random();
if (m_repeat == true) {
int pos1 = m_songPosn;
m_songPosn = pos1;
} else if (m_shuffle == true) {
int newSong = m_songPosn;
while (newSong == m_songPosn) {
newSong = m_rand.nextInt(m_songs.size());
}
m_songPosn = newSong;
} else if (m_repeat == true && m_shuffle == true) {
int pos2 = m_songPosn;
m_songPosn = pos2;
} else {
////////////////////////////////////////////
m_songPosn++;
if (m_songPosn >= m_songs.size()) {
m_songPosn = 0;
}
}
playSong(MainActivity.m_context);
}
public void playPrevSong() {
if (m_shuffle == true) {
int newSong = m_songPosn;
while (newSong == m_songPosn) {
newSong = m_rand.nextInt(m_songs.size());
}
m_songPosn = newSong;
} else {
m_songPosn--;
if (m_songPosn < 0) {
m_songPosn = m_songs.size() - 1;
}
}
playSong(MainActivity.m_context);
}
public void playNextStream() {
m_streamPosition++;
if (m_streamPosition >= m_streams.size()) {
m_streamPosition = 1;
}
playStream();
}
public void playPrevStream() {
m_streamPosition--;
if (m_streamPosition < 1) {
m_streamPosition = m_streams.size() - 1;
}
playStream();
}
}
感谢各种帮助。提前谢谢。