Impossible d'obtenir la liste audio du fournisseur de contenu

Question

Je construis un lecteur de musique et les morceaux sont affichés plusieurs fois dans logcat. Je veux afficher les chansons dans la liste. Voici mon activité principale:

public class MainActivity extends AppCompatActivity { 
    List<String> list=new ArrayList<>(); 
     @Override 
     protected void onCreate(Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.activity_main); 
      File s= Environment.getExternalStorageDirectory(); 
      String[] as={"is_music","title"}; 
      Uri musicUri = android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI; 
      Cursor musicCursor = getContentResolver().query(musicUri,as, null, null,null); 
      String[] a=musicCursor.getColumnNames(); 
      musicCursor.moveToFirst(); 
      Log.i ("fjfj",""+musicCursor.getCount()); 
      for(int i=0;i<musicCursor.getCount();i++){   
       list.add(musicCursor.getString(musicCursor.getColumnIndex("title"))); 
       //Log.i("position",musicCursor.getPosition()+list.get(musicCursor.getPosition())); 
       musicCursor.moveToNext();   
       Log.i("column",i+" "+list.get(i)); 
      } 

     } 
    } 

03-08 21: 17: 26,672 2070-2070/com.example.android.alpha1 I/colonne: 0 Bienvenue à New York 03-08 21:17 : 26.676 2070-2070/com.example.android.alpha1 I/colonne: 1 Espace vide 03-08 21: 17: 26.688 2070-2070/com.example.android.alpha1 I/colonne: 2 Style 03- 08 21: 17: 26.688 2070-2070/com.example.android.alpha1 I/colonne: 3 Out Of The Woods 03-08 21: 17: 26.692 2070-2070/com.example.android.alpha1 I/colonne : 4 Tout ce que vous deviez faire était Restez 03-08 21: 17: 26.696 2070-2070/com.example.android.alpha1 I/col umn: 5 Secouez-le 03-08 21: 17: 26.696 2070-2070/com.example.android.alpha1 I/colonne: 6 Je vous souhaite 03-08 21: 17: 26.700 2070-2070/com .example.android.alpha1 I/colonne: 7 Bad Blood 03-08 21: 17: 26.704 2070-2070/com.example.android.alpha1 I/colonne: 8 Wildest Rêves 03-08 21: 17: 26.704 2070 -2070/com.example.android.alpha1 I/colonne: 9 Comment vous obtenez la fille 03-08 21: 17: 26.712 2070-2070/com.example.android.alpha1 I/colonne: 10 This Love 03- 08 21: 17: 26.712 2070-2070/com.example.android.alpha1 I/colonne: 11 Je sais Places 03-08 21: 17: 26.712 2070-2070/com.example.android.alpha1 I/colonne : 12 Nettoyer 03-08 21: 17: 26.720 2070-2070/com.example.android.alpha1 I/colonne: 13 Wonderland 03-08 21: 17: 26.724 2070-2070/com.example.android.alpha1 I/colonne: 14 Vous êtes In Love 03-08 21: 17: 26.728 2070-2070/com. example.android.alpha1 I/colonne: 15 New Romantics 03-08 21: 17: 26.732 2070-2070/com.example.android.alpha1 I/colonne: 16 I Know Places (Voice Memo) 03-08 21 : 17: 26.744 2070-2070/com.example.android.alpha1 I/colonne: 17 Je vous souhaite (mémo vocal) 03-08 21: 17: 26.748 2070-2070/com.example.android.alpha1 I/colonne: 18 Espace vide (Voice Memo) 03-08 21: 17: 26.752 2070-2070/com.example.android.alpha1 I/colonne: 19 Bienvenue à New York 03-08 21: 17: 26.752 2070 -2070/com.example.android.alpha1 I/colonne: 20 Espace vide 03-08 21: 17: 26.756 2070-2070/com.example.android.alpha1 I/colonne: 21 Style 03-08 21: 17: 26.760 2070-2070/com.example.android.alpha1 I/colonne: 22 Out Of The Woods 03-08 21: 17: 26.764 2070-2070/com.example.android.alpha1 I/colonne: 23 Tout ce que vous deviez faire Was Stay 03-08 21: 17: 26.764 2070-2070/com. example.android.alpha1 I/colonne: 24 Shake It Off 03-08 21: 17: 26,764 2070-2070/com.example.android.alpha1 I/colonne: 25 Je souhaite que vous

Answer 1

Do de cette façon. Initialisez ArrayList et appelez une fonction dans onCreate().

Avant onCreate()

private ArrayList<String> songArrayList; 
private ListView listView; 

En OnCreate():

songArrayList = new ArrayList(); 
listview = (*Find view by Id *); 
getSongList(); 
// Now create and set adapter to listview. Use songArrayList. 

Fonction:

public void getSongList() 
{ 
    /** 
    * All the audio files can be accessed using the below initialised musicUri. 
    * And there is a cursor to iterate over each and every column. 
    */ 
    ContentResolver contentResolver = getActivity().getContentResolver(); 
    Uri musicUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI; 
    Cursor musicCursor = contentResolver.query(musicUri, null, null, null, null, null); 

    // If cursor is not null 
    if(musicCursor != null && musicCursor.moveToFirst()) 
    { 
     //get Columns 
     int titleColumn = musicCursor.getColumnIndex(MediaStore.Audio.Media.TITLE); 


     // Store the title, id and artist name in Song Array list. 
     do 
     { 
      String thisTitle = musicCursor.getString(titleColumn); 
      // Add the info to our array. 
      songArrayList.add(thisTitle); 
     } 
     while (musicCursor.moveToNext()); 

     // For best practices, close the cursor after use. 
     musicCursor.close(); 
    } 
} 

Ceci est un exemple échantillon prélevé de mon projet en cours en cours. J'espère que cela t'aides.