I need to play some music from a posisition on the sdcard how can I do that? I know I need to use the MediaPlayer
class but if im traying to due like this
try {
mpSong.setDataSource(musicposisition);
mpSong.prepare();
mpSong.start();
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
then my app creash the varibale called musicposisition = /sdcard/musictelefon/03 Mare.mp3
when im logging it pleas help!!
Can some ond tell me how I can warp code in also???
don't realy know if this helps some one but here is my logcat output https://docs.google.com/document/d/14k1lqxmdCKxsmwfDUD6za5s7W48lAHOjDfbUHzfgh-s/edit?hl=en_US
you can also code like this if you are fetching a particular extension file .You can use the below code. Right now I am only fetching the .mp3 file from the sdcard.
final String MEDIA_PATH = new String("/sdcard/");
private ArrayList<HashMap<String, String>> songsList = new ArrayList<HashMap<String, String>>();
public ArrayList<HashMap<String, String>> getPlayList(){
File home = new File(MEDIA_PATH);
if (home.listFiles(new FileExtensionFilter()).length > 0) {
for (File file : home.listFiles(new FileExtensionFilter())) {
HashMap<String, String> song = new HashMap<String, String>();
song.put("songTitle", file.getName().substring(0, (file.getName().length() - 4)));
song.put("songPath", file.getPath());
// Adding each song to SongList
songsList.add(song);
}
}
// return songs list array
return songsList;
}
/**
* Class to filter files which are having .mp3 extension
* */
class FileExtensionFilter implements FilenameFilter {
public boolean accept(File dir, String name) {
return (name.endsWith(".mp3") || name.endsWith(".MP3"));
}
}
Your logcat output tells you that you have a NullPointerException: Caused by: java.lang.NullPointerException 08-30 22:25:38.463: ERROR/AndroidRuntime(6107): at simon.programmering.music.MusicActivity.onCreate(MusicActivity.java:73)
Check MusicActivity.java on line 73. What's on there?
是的,所以我在android-dev irc的帮助下发现了问题,我想将mpSong声明为on create metod中的媒体播放器
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