SD卡无法在Android中访问

Question

I am facing continuous problem with accessing SD Card even after using Environment.getExternalStorageDirectory() or even directly using /sdcard/ application is fetching data from phone's internal memory .I am using moto e for testing

Please help

public class SongsManager {

final String MEDIA_PATH = new String(Environment.getExternalStorageDirectory().getPath());
private ArrayList<HashMap<String, String>> songsList = new ArrayList<HashMap<String, String>>();

// Constructor
public SongsManager(){

}




public ArrayList<HashMap<String, String>> getPlayList(){
    File home = new File(MEDIA_PATH);
    walkdir(home);





    return songsList;



}

public void walkdir(File dir) {
    String Pattern = ".mp3";
    File listFile[] = dir.listFiles();
    if (listFile != null) {
    for (int i = 0; i < listFile.length; i++) {
    if (listFile[i].isDirectory()) {
    walkdir(listFile[i]);
    } else {
    if (listFile[i].getName().endsWith(Pattern)){
        for (File file : dir.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);
        }

    }
    }
    }  
    }  
    }

}


class FileExtensionFilter implements FilenameFilter {
    public boolean accept(File dir, String name) {
        return (name.endsWith(".mp3") || name.endsWith(".MP3"));
    }
}

Answer 1

Instead of doing this:

final String MEDIA_PATH = new String(Environment.getExternalStorageDirectory().getPath());
...
File home = new File(MEDIA_PATH);

You could just do this:

File home = Environment.getExternalStorageDirectory();

and then to call you method walkdir

walkdir(home);

I think that the problem is in the getPath() method. Maybe it should be the getAbsolutePath() method

Answer 2

That is normal for Android. It's not easy to get the path to removable media on android. You can read a lot about this on this site. Add a directory picker to your app so the user canindicate it. Try getExternalFileDirs(). If it gives you two directories the latter will be the micro SD card.