Java 单击按钮时无法播放下一首歌曲
我是android开发的新手。我创建了一个音频播放器应用程序,用于从SD卡播放歌曲,它工作正常,歌曲正在播放,但当我单击“下一步”按钮时,歌曲不会更改,相同的曲目仍在播放。按钮可以单击,但歌曲在单击时不会更改。我如何修复它?非常感谢您的帮助,谢谢Java 单击按钮时无法播放下一首歌曲,java,android,xml,listview,onclick,Java,Android,Xml,Listview,Onclick,我是android开发的新手。我创建了一个音频播放器应用程序,用于从SD卡播放歌曲,它工作正常,歌曲正在播放,但当我单击“下一步”按钮时,歌曲不会更改,相同的曲目仍在播放。按钮可以单击,但歌曲在单击时不会更改。我如何修复它?非常感谢您的帮助,谢谢 public class PlayListActivity extends Activity { private String[] mAudioPath; private MediaPlayer mMediaPlayer; p
public class PlayListActivity extends Activity {
private String[] mAudioPath;
private MediaPlayer mMediaPlayer;
private String[] mMusicList;
int currentPosition = 0;
private List<String> songs = new ArrayList<>();
MediaMetadataRetriever metaRetriver;
byte[] art;
ImageView album_art;
TextView album;
TextView artist;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_play_list);
mMediaPlayer = new MediaPlayer();
ListView mListView = (ListView) findViewById(R.id.list);
mMusicList = getAudioList();
ArrayAdapter<String> mAdapter = new ArrayAdapter<>(this,
android.R.layout.simple_list_item_1, mMusicList);
mListView.setAdapter(mAdapter);
mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View view, int arg2,
long arg3) {
try {
playSong(mAudioPath[arg2]);
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
});
}
private String[] getAudioList() {
final Cursor mCursor = getContentResolver().query(
MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
new String[]{MediaStore.Audio.Media.DISPLAY_NAME, MediaStore.Audio.Media.DATA}, null, null,
"LOWER(" + MediaStore.Audio.Media.TITLE + ") ASC");
int count = mCursor.getCount();
String[] songs = new String[count];
mAudioPath = new String[count];
int i = 0;
if (mCursor.moveToFirst()) {
do {
songs[i] = mCursor.getString(mCursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DISPLAY_NAME));
mAudioPath[i] = mCursor.getString(mCursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA));
i++;
} while (mCursor.moveToNext());
}
mCursor.close();
return songs;
}
private void playSong(String path) throws IllegalArgumentException,
IllegalStateException, IOException {
setContentView(R.layout.activity_android_building_music_player);
Log.d("ringtone", "playSong :: " + path);
mMediaPlayer.reset();
mMediaPlayer.setDataSource(path);
//mMediaPlayer.setLooping(true);
mMediaPlayer.prepare();
mMediaPlayer.start();
acv(path);
abc();
cde();
}
public void acv(String path) {
getInit();
metaRetriver = new MediaMetadataRetriever();
metaRetriver.setDataSource(path);
try {
art = metaRetriver.getEmbeddedPicture();
Bitmap songImage = BitmapFactory.decodeByteArray(art, 0, art.length);
album_art.setImageBitmap(songImage);
album.setText(metaRetriver
.extractMetadata(MediaMetadataRetriever.METADATA_KEY_ALBUM));
artist.setText(metaRetriver
.extractMetadata(MediaMetadataRetriever.METADATA_KEY_ARTIST));
} catch (Exception e) {
album_art.setBackgroundColor(Color.GRAY);
album.setText("Unknown Album");
artist.setText("Unknown Artist");
}
}
public void getInit() {
album_art = (ImageView) findViewById(R.id.coverart1);
album = (TextView) findViewById(R.id.Album);
artist = (TextView) findViewById(R.id.artist_name);
}
public void abc() {
ImageButton btnPlay1 = (ImageButton) findViewById(R.id.btnPlay1);
btnPlay1.setBackgroundColor(Color.TRANSPARENT);
btnPlay1.setOnClickListener(
new View.OnClickListener() {
public void onClick(View v) {
if (mMediaPlayer.isPlaying()) {
mMediaPlayer.pause();
} else {
mMediaPlayer.start();
}
}
});
}
public void cde() {
ImageButton btnNext = (ImageButton) findViewById(R.id.btnNext); //this is the button for playing next song.
btnNext.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
try {
currentPosition=currentPosition+1;
playSong(path + songs.get(currentPosition));
} catch (IOException ex) {
ex.printStackTrace();
}
}
});
}
}
公共类播放列表活动扩展活动{
私有字符串[]路径;
私有媒体层;
私有字符串[]mMusicList;
int currentPosition=0;
私有列表歌曲=新建ArrayList();
MediaMetadataRetriever-MetaRetriever;
字节[]艺术;
ImageView相册艺术;
文本视图相册;
文本视图艺术家;
@凌驾
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity\u play\u list);
mMediaPlayer=新媒体播放器();
ListView mListView=(ListView)findViewById(R.id.list);
mMusicList=getAudioList();
ArrayAdapter mAdapter=新的ArrayAdapter(此,
android.R.layout.simple_list_item_1,mMusicList);
mListView.setAdapter(mAdapter);
mListView.setOnItemClickListener(新的AdapterView.OnItemClickListener(){
@凌驾
public void onItemClick(AdapterView arg0、View视图、int arg2、,
长arg3){
试一试{
playSong(mAudioPath[arg2]);
}捕获(IllegalArgumentException e){
e、 printStackTrace();
}捕获(非法状态){
e、 printStackTrace();
}捕获(IOE异常){
e、 printStackTrace();
}
}
});
}
私有字符串[]getAudioList(){
最终游标mCursor=getContentResolver().query(
MediaStore.Audio.Media.EXTERNAL\u CONTENT\u URI,
新字符串[]{MediaStore.Audio.Media.DISPLAY_NAME,MediaStore.Audio.Media.DATA},null,null,
“下(“+MediaStore.Audio.Media.TITLE+”)ASC”);
int count=mCursor.getCount();
字符串[]歌曲=新字符串[计数];
mAudioPath=新字符串[计数];
int i=0;
if(mCursor.moveToFirst()){
做{
songs[i]=mCursor.getString(mCursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DISPLAY_NAME));
mAudioPath[i]=mCursor.getString(mCursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA));
i++;
}while(mCursor.moveToNext());
}
mCursor.close();
返回歌曲;
}
私有void playSong(字符串路径)抛出IllegalArgumentException,
IlegalStateException,IOException{
setContentView(R.layout.activity\u android\u building\u music\u player);
Log.d(“铃声”,“播放歌曲::”+path);
mmediplayer.reset();
mmediplayer.setDataSource(路径);
//mmediplayer.setLooping(true);
mmediplayer.prepare();
mmediplayer.start();
acv(路径);
abc();
cde();
}
公共无效acv(字符串路径){
getInit();
MetaRetriever=新的MediaMetadataRetriever();
metaRetriver.setDataSource(路径);
试一试{
art=MetaRetriever.getEmbeddedPicture();
位图songImage=BitmapFactory.decodeByteArray(艺术,0,艺术长度);
相册\艺术集图像位图(songImage);
album.setText(metaRetriver
.extractMetadata(MediaMetadataRetriever.METADATA_KEY_ALBUM));
艺术家:setText(metaRetriver
.extractMetadata(MediaMetadataRetriever.METADATA_KEY_ARTIST));
}捕获(例外e){
专辑艺术背景色(颜色:灰色);
setText(“未知专辑”);
artist.setText(“未知艺术家”);
}
}
public void getInit(){
相册艺术=(图像视图)findViewById(R.id.Covert1);
相册=(TextView)findViewById(R.id.album);
艺术家=(TextView)findViewById(R.id.artist\u name);
}
公共图书馆{
ImageButton btnPlay1=(ImageButton)findViewById(R.id.btnPlay1);
btnPlay1.setBackgroundColor(颜色.透明);
btnPlay1.setOnClickListener(
新建视图。OnClickListener(){
公共void onClick(视图v){
if(mmediplayer.isPlaying()){
暂停();
}否则{
mmediplayer.start();
}
}
});
}
公共无效cde(){
ImageButton btnNext=(ImageButton)findViewById(R.id.btnNext);//这是播放下一首歌曲的按钮。
btnNext.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图arg0){
试一试{
当前位置=当前位置+1;
播放歌曲(路径+歌曲.get(当前位置));
}捕获(IOEX异常){
例如printStackTrace();
}
}
});
}
}
尝试以下代码:
public void next() {
ImageButton btnNext = (ImageButton) findViewById(R.id.btnNext);
btnNext.setOnClickListener(
new View.OnClickListener() {
public void onClick(View view) {
temp = temp + 1;
try {
playSong(mAudioPath[temp]);
} catch (Exception er) {
er.printStackTrace();
}
}
}
);
}
不要忘记在playsong()