GridViewのダイアログボックスを開く

Question

私はSQLiteデータベース内の項目からデータを取り込んだGridViewを持っています。問題は、GridView上の特定のアイテムがクリックされたときにダイアログボックスを表示する方法を理解できないことです。私は私のコードは以下の通りです、カスタムアダプタを使用しています（私はAndroidにかなり新しい午前、任意のに役立ちます/先端が理解されるであろう）：

RolesFragment.java

public class RolesFragment extends Fragment implements View.OnClickListener { 

    GridView gridView; 
    ArrayList<Players> playersList; 
    MyAdapter adapter; 

    public RolesFragment() { 

    } 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
          Bundle savedInstanceState) { 

     View view = inflater.inflate(R.layout.fragment_viewroles, container, false); 

     gridView = (GridView) view.findViewById(R.id.gv_players); 



     DatabaseHelper databaseHelper = new DatabaseHelper(getActivity()); 
     playersList = new ArrayList<Players>(); 

     playersList = databaseHelper.getPlayers(); 
     adapter = new MyAdapter(getActivity(), playersList); 
     gridView.setAdapter(adapter); 
     addListenerToGrid(); 


     return view; 

    } 

    public void addListenerToGrid() { 
     gridView.setOnTouchListener(new View.OnTouchListener() { 
      @Override 
      public boolean onTouch(View v, MotionEvent me) { 

       int action = me.getActionMasked(); 
       String TAG = "Pressed"; 
       float currentXPosition = me.getX(); 
       float currentYPosition = me.getY(); 
       int position = gridView.pointToPosition((int) currentXPosition, (int) currentYPosition); 
        if (action == MotionEvent.ACTION_UP) { 
         Log.d(TAG, "-"); 
        } 
       return true; 
      } 
     }); 
    } 


    @Override 
    public void onClick(View v) { 

    } 
} 

MyAdapter.java

を

public class MyAdapter extends BaseAdapter { 
Context context; 
ArrayList<Players> playerList; 
private static LayoutInflater inflater = null; 

public MyAdapter(Context context, ArrayList<Players> playerList){ 
    this.context = context; 
    this.playerList = playerList; 
    inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
} 


@Override 
public int getCount() { 
    return playerList.size(); 
} 

@Override 
public Object getItem(int position) { 
    return position; 
} 

@Override 
public long getItemId(int position) { 
    return position; 
} 

@Override 
public View getView(int position, View convertView, ViewGroup parent) { 
    if (convertView == null) 
     convertView = inflater.inflate(R.layout.layout_grid_item, null); 

    TextView idTextView = (TextView) convertView.findViewById(R.id.tv_player_id); 
    TextView nameTextView = (TextView) convertView.findViewById(R.id.tv_player_name); 
    TextView roleTextView = (TextView) convertView.findViewById(R.id.tv_player_role); 

    Players p = new Players(); 
    p = playerList.get(position); 
    idTextView.setText("ID: " + String.valueOf(p.getId())); 
    nameTextView.setText("Name: " + String.valueOf(p.getName())); 
    roleTextView.setText("Role: " + String.valueOf(p.getRole())); 

    return convertView; 
} 


} 

DatabaseHelper.java - 関連のコード -

public ArrayList<Players> getPlayers(){ 
    String query = "SELECT * FROM " + TABLE_NAME; 
    ArrayList<Players> players = new ArrayList<Players>(); 
    SQLiteDatabase database = getReadableDatabase(); 
    Cursor c = database.rawQuery(query, null); 
    if (c != null){ 
     while (c.moveToNext()) { 
      int id = c.getInt(c.getColumnIndex(COL_ID)); 
      String name = c.getString(c.getColumnIndex(COL_NAME)); 
      String role = c.getString(c.getColumnIndex(COL_ROLE)); 

      Players player = new Players(); 
      player.setId(id); 
      player.setName(name); 
      player.setRole(role); 

      Log.v("DBHelper:", "Name:, " + name); 
      Log.v("DBHelper:", "ID:" + id); 
      Log.v("DBHelper:", "Role:" + role); 

      players.add(player); 
     } 
    } 

    return players; 

} 

アイデアは、人が自分のIDと名前を表示するGridViewをクリックすると、プレイヤーの関連する "ロール"を表示します。

Answer 1

あなたのフラグメントにこれを追加します。

public class RolesFragment extends Fragment implements OnClickCallback { 

    MyAdapter adapter; 


    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
        Bundle savedInstanceState) { 

     ... 
     adapter = new MyAdapter(getActivity(), playersList,this); 
     ... 
     return view; 
    }  

    @Override 
     public void onItemClick(int position){ 
      //create a dialog here based on the item selected 
      //to get the item selected you can do adapter.getItem(position); 
     } 
    } 

インタフェース自体：

public interface OnClickCallback { 
    void onItemClick(int position); 
} 

を、アダプタ上：

public class MyAdapter extends BaseAdapter { 
    Context context; 
    OnClickCallback callback; 
    ... 

    public MyAdapter(Context context, ArrayList<Players> playerList,OnClickCallback callback){ 
     this.context = context; 
     this.callback = callback; 
     this.playerList = playerList; 
     inflater = (LayoutInflater) c 
     Context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     if (convertView == null) 
      convertView = inflater.inflate(R.layout.layout_grid_item, null); 

     ... 
     convertView.setOnClickListener(new View.OnClickListener() { 
     @Override 
      public void onClick(View view) { 
       callback.OnItemClick(getAdapterPosition()); 
      } 
     }; 
     return convertView; 
    } 
}