Got force close in SongsManager - android-studio

Question

i am developing a simple media player application but while building the apk in Marshmallow API 23 my applicatioin crashes. Here is my code.
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);
}
}
And this is the full code of SongsManager
package ph.zyber.zybermp;
import java.io.File;
import java.io.FilenameFilter;
import java.util.ArrayList;
import java.util.HashMap;
public class SongsManager {
// SDCard Path
final String MEDIA_PATH = new String("/sdcard/");
private ArrayList<HashMap<String, String>> songsList = new ArrayList<HashMap<String, String>>();
// Constructor
public SongsManager(){
}
/**
* Function to read all mp3 files from sdcard
* and store the details in ArrayList
* */
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"));
}
}
}
I am following the tutorial.
http://www.androidhive.info/2012/03/android-building-audio-player-tutorial/#
Please help me out.
Thanks in advance.

Answer 1

In Eclipse you need to find the path to the folder with the music:
Window-Show View-Other-file explorer (The phone must be connected to a computer).
Where searches the full path, I have turned it - "/storage/extSdCard/Music".
After I put it in the code and it worked:
final String MEDIA_PATH = new String("/storage/extSdCard/Music");
Good luck.

Answer 2

Modify SongsManger like this and you have to pass context of appropriate activity during object creation of songsmanger in that activity
I have corrected the code for getplaylist() function and dont forget to add runtime permission in manifest and also
check the permission using a dialog box
extend appcombatActivity in each of your activity it contains the content resolver
eg:
SongsManager plm = new SongsManager(PlayListActivity.this);
// get all songs from sdcard
this.songsList = plm.getPlayList();
public class SongsManager {
private ArrayList<hashmap<string, string="">> songsList = new ArrayList<hashmap<string, string="">>();
Cursor cursor;
Context context;
// Constructor
public SongsManager(Context context){
this.context = context;
}
/**
* Function to read all mp3 files from sdcard
* and store the details in ArrayList
* */
public ArrayList<hashmap<string, string="">> getPlayList(){
String selection = MediaStore.Audio.Media.IS_MUSIC + " != 0";
String[] projection = {
MediaStore.Audio.Media._ID,
MediaStore.Audio.Media.ARTIST,
MediaStore.Audio.Media.TITLE,
MediaStore.Audio.Media.DATA,
MediaStore.Audio.Media.DISPLAY_NAME,
MediaStore.Audio.Media.DURATION
};
ContentResolver contentResolver = context.getContentResolver();
cursor = contentResolver.query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,projection, selection,null,null);
while(cursor.moveToNext()) {
HashMap<string, string=""> song = new HashMap<string, string="">();
song.put("songID",cursor.getString(0));
song.put("songTitle",cursor.getString(2));
song.put("songPath",cursor.getString(3));
// Adding each song to SongList
songsList.add(song);
}
// return songs list array
return songsList;
}
}