「添加到收藏夾」 選項，在音板的應用程序

Question

我有這樣的代碼爲我的音板，

公共類soundboardActivity延伸活動{

View lastClickedView; 

    public static void setIntArrayPref(Context context, String key, ArrayList<Integer>  values) { 
    SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context); 
    SharedPreferences.Editor editor = prefs.edit(); 
    JSONArray a = new JSONArray(); 
    for (int i = 0; i < values.size(); i++) { 
     a.put(values.get(i)); 
    } 
    if (!values.isEmpty()) { 

     editor.putString(key, a.toString()); 
    } else { 
     editor.putString(key, null); 
    } 
    editor.commit(); 
} 



    public boolean onCreateOptionsMenu(Menu menu) { 
     MenuInflater inflater = getMenuInflater(); 
     inflater.inflate(R.menu.menu, menu); 
     return true; 
    } 
    // Contextual Menu 
    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) 
    { 
     super.onCreateContextMenu(menu, v, menuInfo); 

      menu.setHeaderTitle("OPTIONS"); 
      MenuInflater inflater = getMenuInflater(); 
       inflater.inflate(R.menu.menu_contex_apm, menu); 

       lastClickedView = v; 
    } 
    public boolean onContextItemSelected(MenuItem item) { 

      switch (item.getItemId()) { 
       case R.id.ctxtapm_opcio1: 
        //favorites 

        switch (lastClickedView.getId()){ 
           case R.id.a1: favorites.add(R.raw.sound1); 
           return true; 
            } 
           case R.id.a2: favorites.add(R.raw.sound2); 
           return true; 
            } 
           case R.id.a3: favorites.add(R.raw.sound3); 
           return true; 
            } 
        setIntArrayPref(this, "favoritos", favorites); 


        return true; 
       case R.id.ctxtapm_opcio2: 
        //share 

        return true; 

       default: 
        return super.onContextItemSelected(item); 
      } 
     } 

/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.apm); 

    Map<Integer, Integer> map = new HashMap<Integer, Integer>(); 
    map.put(R.id.a1, R.raw.sound1); 
    map.put(R.id.a2, R.raw.sound2); 
    map.put(R.id.a3, R.raw.sound3); 



    for (Map.Entry<Integer, Integer> entry : map.entrySet()) { 


     final MediaPlayer sound = MediaPlayer.create(this,entry.getValue()); 
     Button button = (Button) findViewById(entry.getKey()); 

     registerForContextMenu(button); 

     button.setOnClickListener(new View.OnClickListener() { 

      public void onClick(View v) { 
       sound.start(); 
      } 

     }); 

    } 

FavoritesActivity代碼：

public class FavoritosActivity extends Activity { 

ArrayList<Integer> favorites=new ArrayList<Integer>(); 

public View getView (int position, View convertView, ViewGroup parent) { 

     LayoutInflater inflater = this.getLayoutInflater(); 
     View item = inflater.inflate(R.layout.buttonsample, null); 

    return item; 
} 

public static ArrayList<Integer> getIntArrayPref(Context context, String key) { 
    SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context); 
    String json = prefs.getString(key, null); 
    ArrayList<Integer> favoritos = new ArrayList<Integer>(); 
    if (json != null) { 
     try { 
      JSONArray a = new JSONArray(json); 
      for (int i = 0; i < a.length(); i++) { 
       int musicaid = a.optInt(i); 
       favoritos.add(musicaid); 
      } 
     } catch (JSONException e) { 
      e.printStackTrace(); 
     } 
    } 
    return favoritos; 
} 

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    MenuInflater inflater = getMenuInflater(); 
    inflater.inflate(R.menu.menu, menu); 
    return true; 
} 

/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.proba); 

    favorites = getIntArrayPref(this, "favoritos"); 

    ListView lv = (ListView) findViewById(R.id.listView1); 


    ArrayAdapter<Integer> arrayAdapter = new ArrayAdapter<Integer>(this,android.R.layout.simple_list_item_1, favorites); 
    lv.setAdapter(arrayAdapter); 


} 

}

問題是，我如何實現「添加到收藏夾」選項（我的最愛是我ñ另一項活動）的上下文菜單？

非常感謝！

Answer 1

在onCreateOptionsMenu中創建一個更多ArrayList的最愛。

每次將歌曲ID存儲在數組列表中。 將此數組列表存儲在SharedPreferences對象中 當用戶選擇收藏播放導航到下一個活動時獲取SharedPreferences。 根據收藏列表中的位置播放歌曲。

我希望上面的解決方案對你很明顯