我是Android开发新手，目前我正在android.So中实现简单的音乐播放器应用程序，我的问题是我在这个音乐播放器中使用片段，我想在另一个listview片段中添加最近播放的歌曲。 / p>
这是我的主要播放器片段类.......
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 MediaPlayer mp;
VisualizerView mVisualizerView;
SliderView sl;
private Visualizer mVisualizer;
// 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<SongModel> songsList = new ArrayList<SongModel>();
int songIndex;
private AudioManager audioManager = null;
SongAdapter songAdapter;
public Player(int position) {
songIndex = position;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View android = inflater.inflate(R.layout.player, container, false);
super.onCreate(savedInstanceState);
// variable initialization for button
btnPlay = (ImageButton) android.findViewById(R.id.btnPlay);
btnForward = (ImageButton) android.findViewById(R.id.btnForward);
btnBackward = (ImageButton) android.findViewById(R.id.btnBackward);
btnNext = (ImageButton) android.findViewById(R.id.btnNext);
btnPrevious = (ImageButton) android.findViewById(R.id.btnPrevious);
btnRepeat = (ImageButton) android.findViewById(R.id.btnRepeat);
btnShuffle = (ImageButton) android.findViewById(R.id.btnShuffle);
songProgressBar = (SeekBar) android.findViewById(R.id.songProgressBar);
songTitleLabel = (TextView) android.findViewById(R.id.songTitle);
songTitleLabel.setEllipsize(TextUtils.TruncateAt.MARQUEE);
songTitleLabel.setSingleLine(true);
songCurrentDurationLabel = (TextView)android.findViewById(R.id.songCurrentDurationLabel);
songTotalDurationLabel = (TextView) android.findViewById(R.id.songTotalDurationLabel);
mVisualizerView = (VisualizerView) android.findViewById(R.id.myvisualizerview);
audioManager = (AudioManager)getActivity().getSystemService(Context.AUDIO_SERVICE);
//get bundle data
/*Bundle b = getArguments();
int position = b.getInt("songIndex");
Log.i("position...","...."+position);*/
//Log.i("songIndex...","...."+);
//sliding finger up and increase and decrease volume
android.setOnTouchListener(new View.OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
int action = MotionEventCompat.getActionMasked(event);
if (action == MotionEvent.ACTION_MOVE) {
// put your volume change logic here, for example compare previously recorded x/y position to new one and change volume
audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, 5, 0);
}
return true;
}
});
//Visualizer method
mp = new MediaPlayer();
initAudio();
// Mediaplayer
songManager = new SongsManager();
utils = new Utilities();
// Listeners
songProgressBar.setOnSeekBarChangeListener(this); // Important
mp.setOnCompletionListener(this); // Important
// Getting all songs list
songsList = songManager.getPlayList();
// By default play first song
if (songIndex==0)
{
playSong(0);
}
else
{
playSong(songIndex);
}
btnPlay.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// check for already playing
if (mp.isPlaying()) {
if (mp != null) {
mp.pause();
btnPlay.setImageResource(R.drawable.btn_play);
}
} else {
// Resume song
if (mp != null) {
mp.start();
btnPlay.setImageResource(R.drawable.btn_pause);
}
}
}
});
btnForward.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
int currentPosition = mp.getCurrentPosition();
if(currentPosition + seekForwardTime <= mp.getDuration()){
mp.seekTo(currentPosition + seekForwardTime);
}else{
mp.seekTo(mp.getDuration());
}
}
});
btnBackward.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
int currentPosition = mp.getCurrentPosition();
if(currentPosition - seekBackwardTime >= 0){
mp.seekTo(currentPosition - seekBackwardTime);
}else{
mp.seekTo(0);
}
}
});
btnNext.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
if(currentSongIndex < (songsList.size() - 1)){
playSong(currentSongIndex + 1);
currentSongIndex = currentSongIndex + 1;
}else{
playSong(0);
currentSongIndex = 0;
}
}
});
btnPrevious.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
if(currentSongIndex > 0){
playSong(currentSongIndex - 1);
currentSongIndex = currentSongIndex - 1;
}else{
playSong(songsList.size() - 1);
currentSongIndex = songsList.size() - 1;
}
}
});
btnRepeat.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
if(isRepeat){
isRepeat = false;
Toast.makeText(getActivity().getApplicationContext(), "Repeat is OFF", Toast.LENGTH_SHORT).show();
btnRepeat.setImageResource(R.drawable.btn_repeat);
}else{
isRepeat = true;
Toast.makeText(getActivity().getApplicationContext(), "Repeat is ON", Toast.LENGTH_SHORT).show();
isShuffle = false;
btnRepeat.setImageResource(R.drawable.btn_repeat_focused);
btnShuffle.setImageResource(R.drawable.btn_shuffle);
}
}
});
btnShuffle.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
if(isShuffle){
isShuffle = false;
Toast.makeText(getActivity().getApplicationContext(), "Shuffle is OFF", Toast.LENGTH_SHORT).show();
btnShuffle.setImageResource(R.drawable.btn_shuffle);
}else{
isShuffle= true;
Toast.makeText(getActivity().getApplicationContext(), "Shuffle is ON", Toast.LENGTH_SHORT).show();
isRepeat = false;
btnShuffle.setImageResource(R.drawable.btn_shuffle_focused);
btnRepeat.setImageResource(R.drawable.btn_repeat);
}
}
});
return android;
}
private void initAudio() {
getActivity().setVolumeControlStream(AudioManager.STREAM_MUSIC);
mp = MediaPlayer.create(getActivity(),R.raw.test);
mp.setLooping(true);
setupVisualizerFxAndUI();
mVisualizer.setEnabled(true);
mp.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
public void onCompletion(MediaPlayer mediaPlayer) {
mVisualizer.setEnabled(false);
}
});
mp.start();
}
private void setupVisualizerFxAndUI() {
mVisualizer = new Visualizer(mp.getAudioSessionId());
mVisualizer.setCaptureSize(Visualizer.getCaptureSizeRange()[1]);
mVisualizer.setDataCaptureListener(
new Visualizer.OnDataCaptureListener() {
public void onWaveFormDataCapture(Visualizer visualizer,
byte[] bytes, int samplingRate) {
mVisualizerView.updateVisualizer(bytes);
}
public void onFftDataCapture(Visualizer visualizer,
byte[] bytes, int samplingRate) {
}
}, Visualizer.getMaxCaptureRate() / 2, true, false);
}
@Override
public 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(currentSongIndex);
}
}
public void playSong(int songIndex){
try {
mp.reset();
mp.setDataSource(songsList.get(songIndex).getSongPath());
mp.prepare();
mp.start();
String songTitle = songsList.get(songIndex).getSongTitle();
songTitleLabel.setText(songTitle);
btnPlay.setImageResource(R.drawable.btn_pause);
songProgressBar.setProgress(0);
songProgressBar.setMax(100);
updateProgressBar();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
private void updateProgressBar() {
mHandler.postDelayed(mUpdateTimeTask,100);
}
private Runnable mUpdateTimeTask = new Runnable() {
public void run() {
long totalDuration = mp.getDuration();
long currentDuration = mp.getCurrentPosition();
songTotalDurationLabel.setText(""+utils.milliSecondsToTimer(totalDuration));
songCurrentDurationLabel.setText(""+utils.milliSecondsToTimer(currentDuration));
int progress = (int)(utils.getProgressPercentage(currentDuration, totalDuration));
songProgressBar.setProgress(progress);
mHandler.postDelayed(this,100);
}
};
@Override
public void onCompletion(MediaPlayer mp) {
if(isRepeat){
playSong(currentSongIndex);
} else if(isShuffle){
Random rand = new Random();
currentSongIndex = rand.nextInt((songsList.size() - 1) - 0 + 1) + 0;
playSong(currentSongIndex);
} else{
if(currentSongIndex < (songsList.size() - 1)){
playSong(currentSongIndex + 1);
currentSongIndex = currentSongIndex + 1;
}else{
playSong(0);
currentSongIndex = 0;
}
}
}
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
mHandler.removeCallbacks(mUpdateTimeTask);
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
mHandler.removeCallbacks(mUpdateTimeTask);
int totalDuration = mp.getDuration();
int currentPosition = utils.progressToTimer(seekBar.getProgress(), totalDuration);
mp.seekTo(currentPosition);
updateProgressBar();
}
@Override
public void onDestroy() {
super.onDestroy();
mHandler.removeCallbacks(mUpdateTimeTask);
if (mp != null) {
if (mp.isPlaying()) mp.stop();
mp.reset();
mp.release();
}
}
public void onBackPressed() {
new AlertDialog.Builder(getActivity())
.setIcon(R.drawable.musiclogo)
.setTitle("Closing M-Player")
.setMessage("Are you sure you want to close this application?")
.setPositiveButton("Yes", new DialogInterface.OnClickListener()
{
public void onClick(DialogInterface dialog, int which) {
getActivity().finish();
}
})
.setNegativeButton("No",null)
.show();
}}
这是我的播放列表（Songlist）片段并扩展了listfragment
EditText edtSearch;
ListAdapter adapter;
SongAdapter songAdapter;
ArrayList<SongModel> songList = new ArrayList<SongModel>();
SongsManager songsManager = new SongsManager();
// Songs list
public ArrayList<SongModel> songsList = new ArrayList<>();
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View windows = inflater.inflate(R.layout.playlist, container, false);
return windows;
}
@Override
public void onViewCreated(View v, Bundle savedInstanceState) {
super.onViewCreated(v, savedInstanceState);
edtSearch = (EditText)getView().findViewById(R.id.search);
final ArrayList<SongModel> songsListData = songsManager.songList;
Log.i("songsListData...",""+songsListData.size());
SongsManager plm = new SongsManager();
// get all songs from sdcard
this.songsList = plm.getPlayList();
// looping through playlist
for (int i = 0; i < songsListData.size(); i++) {
// creating new HashMap
SongModel song = songsListData.get(i);
// adding HashList to ArrayList
songsListData.add(song);
}
// Adding menuItems to ListView
/* adapter = new SimpleAdapter(getActivity(), songsListData, R.layout.playlist_item, new String[] { "songTitle" }, new int[] {
R.id.songTitle });*/
songAdapter = new SongAdapter(getActivity(),songsList);
setListAdapter(songAdapter);
// selecting single ListView item
final ListView lv = getListView();
// listening to single listitem click
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View arg0,
int position, long id) {
// getting listitem index
Log.i("Index", "..." + position);
// Starting new intent
Intent i = new Intent(getActivity().getApplicationContext(),Main.class);
SongModel songModel = (SongModel) songAdapter.getItem(position);
int indexOfSong = songAdapter.songsList.indexOf(songModel);
// Sending songIndex to PlayerActivity
i.putExtra("songIndex", indexOfSong);
getActivity().setResult(100, i);
startActivityForResult(i, 100);
}
});
edtSearch.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence cs, int start, int before, int count) {
}
@Override
public void afterTextChanged(Editable s) {
String text = edtSearch.getText().toString().toLowerCase(Locale.getDefault());
songAdapter.filter(text);
}
});
}
这是我的歌曲管理员课程。
public ArrayList<SongModel> songList = new ArrayList<SongModel>();
// SDCard Path
final String MEDIA_PATH = new String("/sdcard/");
// Constructor
public SongsManager(){
}
public ArrayList<SongModel> getPlayList(){
File home = new File(MEDIA_PATH);
if (home.listFiles(new FileExtensionFilter()).length > 0) {
for (File file : home.listFiles(new FileExtensionFilter())) {
SongModel setter = new SongModel();
setter.setSongPath(file.getPath());
setter.setSongTitle(file.getName().substring(0, (file.getName().length() - 4)));
songList.add(setter);
}
}
return songList;
}
class FileExtensionFilter implements FilenameFilter {
public boolean accept(File dir, String name) {
return (name.endsWith(".mp3") || name.endsWith(".MP3"));
}
}
这是我的歌曲适配器和扩展基座适配器。
Context context;
//private ArrayList<SongModel> songsList = null;
SongAdapter songAdapter;
private ArrayList<SongModel> songsListDat = null;
public ArrayList<SongModel> songsList;
private static LayoutInflater inflater;
public SongAdapter(FragmentActivity activity, ArrayList<SongModel> songsListDat) {
this.context = activity;
this.songsListDat = songsListDat;
this.songsList = new ArrayList<SongModel>();
this.songsList.addAll(songsListDat);
}
@Override
public int getViewTypeCount() {
return getCount();
}
@Override
public int getCount() {
return songsListDat.size();
}
@Override
public Object getItem(int position) {
return songsListDat.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public int getItemViewType(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View vi = convertView;
if (convertView == null)
vi = inflater.inflate(R.layout.playlist_item, null);
TextView title = (TextView) vi.findViewById(R.id.songTitle); // title
SongModel song = new SongModel();
song = songsListDat.get(position);
// Setting all values in listview
title.setText(song.getSongTitle());
return vi;
如果有人知道这个的逻辑，请帮助我。 提前致谢
答案 0 :(得分：0)
最后我做到了。这是我对这个逻辑的改变
我创建了一个Utility常量类并传递了这个arraylist globaly。
casperjs --ignore-ssl-errors=true --ssl-protocol=any scrape.js
这是我的播放列表类，用于将点击的列表视图项发送到另一个列表视图
public static ArrayList<SongModel> recentSongList = new ArrayList<SongModel>();
这是我最近的播放列表片段，用于获取listview中最近点击的播放歌曲
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View arg0,
int position, long id) {
Log.i("Index", "..." + position);
songAdapter.setSelectedIndex(position);
Intent i = new Intent(getActivity().getApplicationContext(),Main.class);
SongModel songModel = (SongModel) songAdapter.getItem(position);
int indexOfSong = songAdapter.songsList.indexOf(songModel);
// Sending songIndex to PlayerActivity
i.putExtra("songIndex", indexOfSong);
getActivity().setResult(100, i);
startActivityForResult(i, 100);
//putting song in recentSongList arraylist
SongModel model = (SongModel) songAdapter.getItem(position);
model.setSongTitle(songModel.getSongTitle());
model.setSongPath(songModel.getSongPath());
Constant.recentSongList.add(model);
Log.i("recentSongList...","..."+Constant.recentSongList.size());
}
});