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[英]How to play mp3 files from internal and external SD card in android?
[英]how to access mp3 files from sd card of a mobile device
我正在嘗試制作媒體播放器應用程序,但無法從移動設備訪問音樂文件,我也獲得了用戶許可。我如何訪問mp3文件。我試圖從以下位置訪問媒體文件:文件名是Download的SD卡,但無法正常工作。有沒有辦法從android設備訪問所有mp3文件?這是我的代碼
public class MainActivity extends ListActivity {
private static final String SD_PATH =new String("/Download/");
private List<String> songs =new ArrayList<String>();
private MediaPlayer mp =new MediaPlayer();
class Mp3Filter implements FilenameFilter{
@Override
public boolean accept(File dir, String filename) {
return (filename.endsWith(".mp3"));
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
updatePlaylist();
Button button =(Button)findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mp.stop();
}
});
}
protected void onListItemClick(ListView list,View view,int position,long id){
try{
mp.reset();
mp.setDataSource(SD_PATH + songs.get(position));
mp.prepare();
mp.start();
} catch (IOException e) {
Log.v(getString(R.string.app_name),e.getMessage());
}
}
private void updatePlaylist() {
File home =new File(SD_PATH);
if (home.listFiles(new Mp3Filter()).length > 0) {
for(
File file:home.listFiles(new Mp3Filter())
) {
songs.add(file.getName());
}
ArrayAdapter<String>songlist =new ArrayAdapter<String>(this,R.layout.text,songs);
setListAdapter(songlist);
}
}
您沒有指向正確的sd卡目錄。 您的SD_PATH
應該看起來像-
String SD_PATH = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).toString();
這是設備sd卡上Downloads文件夾的外部存儲路徑。 您可以根據需要將特定的文件名附加到此路徑。
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