在新活動前關閉對話框

Question

我正在創建一個遊戲，其中用戶選擇圖像並創建一個謎題。第一個屏幕讓用戶選擇一個圖像，並且點擊時出現一個對話框，讓用戶選擇難度。在ImageSelection之後，圖像在ShowImage Activity中顯示三秒鐘，之後GamePlay啓動。我創建瞭如下對話框：

import android.app.AlertDialog; 
import android.content.Context; 
import android.content.DialogInterface; 
import android.content.Intent; 

class GameDialog { 

    private static Context mContext; 
    private static int difficulty; 
    static AlertDialog d; 

    public static AlertDialog showDifficulties(Context c, final int img_id) { 

     mContext = c; 

     AlertDialog.Builder builder = new AlertDialog.Builder(mContext); 
     builder.setTitle("Select difficulty") 
       .setItems(R.array.my_array, new DialogInterface.OnClickListener() { 
        public void onClick(DialogInterface dialog, int which) { 
        // the 'which' argument contains the index position 
        // of the selected item 

         // default difficulty is 3 
         int difficulty = 3; 

         // options for difficulties 
         switch (which) { 

          // when the user clicks 'easy' 
          case 0: 
           difficulty = 3; 
           System.out.print("DIFFICULTY"); 
           System.out.println("" + difficulty); 

          break; 

          // when the user clicks 'medium' 
          case 1: 
          difficulty = 4; 

          System.out.print("DIFFICULTY"); 
          System.out.println("" + difficulty); 
          break; 

          // when the user clicks 'hard' 
          case 2: 
          difficulty = 5; 

          System.out.print("DIFFICULTY"); 
          System.out.println("" + difficulty); 
          break; 
          } 

         // send intent with image id and difficulty 
         // to ShowImage activity 
         Intent start_game = new Intent(mContext, ShowImage.class); 
         start_game.putExtra("img_id", img_id); 
         start_game.putExtra("difficulty", difficulty); 
         d.dismiss(); 
         mContext.startActivity(start_game); 
       } 
     }); 

     d = builder.create(); 
     return d; 

    } 
} 

這很好（工作）。其次，在GamePlay中，我希望用戶能夠從菜單中更改難度，之後應用程序再次啓動ShowImage，但是具有相應的選擇難度。 下面是遊戲的代碼：

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 

    // handle item selection 
    switch (item.getItemId()) { 
     case R.id.reset_game: 
      //TODO: resets the game to initial shuffled tiles 
      Intent intent = getIntent(); 
      finish(); 
      startActivity(intent); 

     case R.id.difficulty: 
      // lets user change the difficulty of the game 
      // pass the index to the dialog and show the dialog 
      Dialog d = GameDialog.showDifficulties(GamePlay.this, selected_image); 
      System.out.println(selected_image); 
      d.show(); 

     case R.id.quit: 
      // returns the user to ImageSelection 
      intent = new Intent(GamePlay.this, ImageSelection.class); 
      intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); 
      startActivity(intent); 
      finish(); 
     default: 
      return super.onOptionsItemSelected(item); 
    } 
} 

然而，應用程序引發錯誤「的遊戲已泄漏（ETC），最初這裏添加窗口com.android.internal.policy.impl.PhoneWindow $ DecorView」 我做了一些研究，並認爲它可能是由於沒有關閉ImageSelection Activity中的對話框而導致的。所以我採取了一些步驟，並已將此添加到我的ImageSelection活動：

@Override 
public void onPause() 
{ 
    d.dismiss(); 
    super.onPause(); 

} 

然而，這並沒有解決我的問題：C 我的問題因此，我在做什麼錯了，我如何修正這個錯誤？目標是從兩個不同的活動中獲得同一個對話框（來自我創建的獨立課程）。 在此先感謝！

編輯：我現在添加了「d.dismiss（）;」到Hany Elsioufy建議的對話類，但是這並沒有解決問題。

Answer 1

我修好了！

原來我不得不返回語句添加到我的switch-case中onOptionsItemSelected（）：

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 

    // handle item selection 
    switch (item.getItemId()) { 
     case R.id.reset_game: 
      //TODO: resets the game to initial shuffled tiles 
      Intent intent = getIntent(); 
      finish(); 
      startActivity(intent); 
      return true; 

     case R.id.difficulty: 
      // lets user change the difficulty of the game 
      // pass the index to the dialog and show the dialog 
      Dialog d = GameDialog.showDifficulties(GamePlay.this, selected_image); 
      System.out.println(selected_image); 
      d.show(); 
      return true; 

     case R.id.quit: 
      // returns the user to ImageSelection 
      intent = new Intent(GamePlay.this, ImageSelection.class); 
      intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); 
      startActivity(intent); 
      finish(); 
      return true; 

     default: 
      return super.onOptionsItemSelected(item); 

    } 
} 

Answer 2

Define AlertDialog d;作爲一個實例變量，然後之前的任何startActivity或意圖寫：

d.dismiss(); 

Answer 3

@覆蓋 公共布爾onOptionsItemSelected（菜單項項）{

// handle item selection 
switch (item.getItemId()) { 
    case R.id.reset_game: 
     //TODO: resets the game to initial shuffled tiles 
     Intent intent = getIntent(); 
     finish(); 
     startActivity(intent); 

    case R.id.difficulty: 
     // lets user change the difficulty of the game 
     // pass the index to the dialog and show the dialog 
     Dialog d = GameDialog.showDifficulties(GamePlay.this, selected_image); 
     System.out.println(selected_image); 
     d.show(); 

    case R.id.quit: 
     // returns the user to ImageSelection 
     intent = new Intent(GamePlay.this, ImageSelection.class); 
     intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); 
     startActivity(intent); 
     finish(); 
    default: 
     return super.onOptionsItemSelected(item); 
} 

}

在上面的代碼中，有是沒有突破的聲明。 使用開關盒時請使用break語句。