メイン変数からpublic変数を呼び出すにはどうすればいいですか？アクティビティ

Question

私はAndroid Javaの初心者です。私はチュートリアルのSpriteゲームに従って少し修正しましたが、GameViewからMainから変数を取得しようとすると問題が発生します。実際、私はGameViewからMainのgetsetting（）を呼びたいと思っています。開発画面では正常に見えますが、実行するとエラーが発生します。

package android.learning.pickthemout; 
import android.app.Activity; 
import android.content.SharedPreferences; 
import android.os.Bundle; 
import android.view.Window; 
import android.media.AudioManager; 
import android.media.MediaPlayer; 
import android.media.SoundPool; 
public class Main extends Activity { 
private SoundPool sounds; 
private int sExplosion; 
private int sExplosion_good; 
public boolean soundsetting;  
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    requestWindowFeature(Window.FEATURE_NO_TITLE); 
    setContentView(new GameView(this)); } 
public boolean getsetting(){ 
    SharedPreferences test = getSharedPreferences(MenuActivity.PREFS_NAME,0); 
    boolean soundsetting = test.getBoolean("sound", true);  
    System.out.println ("soundsetting: "+ soundsetting); 
    return soundsetting; 
} 
} 


package android.learning.pickthemout; 
import java.util.ArrayList; 
import java.util.List; 
import android.R.string; 
import android.content.Context; 
import android.content.SharedPreferences; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.graphics.Canvas; 
import android.graphics.Color; 
import android.media.AudioManager; 
import android.media.MediaPlayer; 
import android.media.SoundPool; 
import android.os.Vibrator; 
import android.view.MotionEvent; 
import android.view.SurfaceHolder; 
import android.view.SurfaceView; 
import android.app.Activity; 
import android.view.View; 
import android.widget.TextView; 
import android.content.res.*; 
public class GameView extends SurfaceView { 
    private GameLoopThread gameLoopThread; 
    private List<Sprite> sprites = new ArrayList<Sprite>(); 
    private List<Sprite> sprites_good = new ArrayList<Sprite>(); 
    private List<TempSprite> temps = new ArrayList<TempSprite>(); 
    private List<WinState> winstates = new ArrayList<WinState>(); 
    private long lastClick; 
    private Bitmap bmpBlood; 
    private Bitmap bmpwinner; 
    private SoundPool sounds; 
    private int sExplosion; 
    private int sExplosion_good; 
    /* 
* State-tracking constants 
*/ 
public static final int STATE_LOSE = 1; 
public static final int STATE_PAUSE = 2; 
public static final int STATE_READY = 3; 
public static final int STATE_RUNNING = 4; 
public static final int STATE_WIN = 5;  
private int mMode; 
private Context context; 
private Vibrator v; 
private int level =1; 
private boolean settingsound; 
protected MenuActivity sa; 
private Main main; 
    public GameView(Context context) { 
     super(context);    
     gameLoopThread = new GameLoopThread(this); 
     getHolder().addCallback(new SurfaceHolder.Callback() { 
       @Override 
       public void surfaceDestroyed(SurfaceHolder holder) { 
         boolean retry = true; 
         gameLoopThread.setRunning(false); 
         while (retry) { 
           try { 
            gameLoopThread.join(); 
            retry = false; 
           } catch (InterruptedException e) {} 
         } 
       } 
       @Override 
       public void surfaceCreated(SurfaceHolder holder) { 
         createSprites(); 
         gameLoopThread.setRunning(true); 
         gameLoopThread.start(); 
       } 
       @Override 
       public void surfaceChanged(SurfaceHolder holder, int format, 
           int width, int height) { 
       } 
     }); 
     bmpBlood = BitmapFactory.decodeResource(getResources(), R.drawable.blood1);    
     sounds = new SoundPool(1, AudioManager.STREAM_MUSIC,0); 
     sExplosion = sounds.load(context, R.raw.ouch, 1); 
     sExplosion_good = sounds.load(context, R.raw.mariohello, 1); 
     v = (Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE);    
    } 
private void createSprites() { 
     sprites.add(createSprite(R.drawable.bad1)); 
     sprites.add(createSprite(R.drawable.bad2)); 
     sprites.add(createSprite(R.drawable.bad3)); 
     sprites.add(createSprite(R.drawable.bad4)); 
     sprites.add(createSprite(R.drawable.bad5)); 
     sprites.add(createSprite(R.drawable.bad6)); 
     sprites_good.add(createSprite(R.drawable.good1)); 
     sprites_good.add(createSprite(R.drawable.good2)); 
     sprites_good.add(createSprite(R.drawable.good3)); 
     sprites_good.add(createSprite(R.drawable.good4)); 
     sprites_good.add(createSprite(R.drawable.good5)); 
     sprites_good.add(createSprite(R.drawable.good6)); 
    } 
    private Sprite createSprite(int resouce) { 
     Bitmap bmp = BitmapFactory.decodeResource(getResources(), resouce); 
     return new Sprite(this, bmp); 
    }  
    private void winlevel (int lvl) { 
     if (lvl == 1) 
     bmpwinner = BitmapFactory.decodeResource(getResources(), R.drawable.winner1); 
     else if (lvl == 2) 
      bmpwinner = BitmapFactory.decodeResource(getResources(), R.drawable.winner2); 
     else if (lvl == 3) 
      bmpwinner = BitmapFactory.decodeResource(getResources(), R.drawable.winner3); 
     else if (lvl == 4) 
      bmpwinner = BitmapFactory.decodeResource(getResources(), R.drawable.winner4);  
     else if (lvl == 5) 
      bmpwinner = BitmapFactory.decodeResource(getResources(), R.drawable.winner5); 
     else if (lvl == 6) 
      bmpwinner = BitmapFactory.decodeResource(getResources(), R.drawable.winner6); 
     else if (lvl == 7) 
      bmpwinner = BitmapFactory.decodeResource(getResources(), R.drawable.winner7); 
     else if (lvl == 8) 
      bmpwinner = BitmapFactory.decodeResource(getResources(), R.drawable.winner8); 
     else if (lvl == 9) 
      bmpwinner = BitmapFactory.decodeResource(getResources(), R.drawable.winner9); 
     else if (lvl == 10) 
      bmpwinner = BitmapFactory.decodeResource(getResources(), R.drawable.winner10); 
     }  
    private void playSound(int n){ 
     settingsound = new Main().getsetting(); 
    } 
    private void playvibrate() { 
    // if (setting.settingsHolder[2]) 
      v.vibrate(300); 
    } 
    @Override 
    protected void onDraw(Canvas canvas) { 
     canvas.drawColor(Color.BLACK); 
     for (int i = temps.size() - 1; i >= 0; i--) { 
       temps.get(i).onDraw(canvas); 
     }  
     for (int i = winstates.size() - 1; i >= 0; i--) { 
      winstates.get(i).onDraw(canvas); 
     } 
     for (Sprite sprite : sprites) { 
       sprite.onDraw(canvas); 
     } 
     for (Sprite sprite : sprites_good) { 
      sprite.onDraw(canvas); 
     }   
    } 
    @Override 
    public boolean onTouchEvent(MotionEvent event) {   
     if (System.currentTimeMillis() - lastClick > 300) { 
       lastClick = System.currentTimeMillis(); 
       float x = event.getX(); 
       float y = event.getY(); 
       synchronized (getHolder()) { 
         for (int i = sprites.size() - 1; i >= 0; i--) { 
          Sprite sprite = sprites.get(i); 
           if (sprite.isCollition(x, y)) {           sprites.remove(sprite); 
             playSound(0); 
             temps.add(new TempSprite(temps, this, x, y, bmpBlood));           
            break;       
           }         
          }       
         for (int i = sprites_good.size() - 1; i >= 0; i--) { 
          Sprite sprite = sprites_good.get(i);         
          if (sprite.isCollition(x, y)) { 
           playSound(1);   
           playvibrate();                 
           break;          
          } 
        } 
         if (sprites.isEmpty()) { 
          winlevel (level); 
          System.out.println("sprites.isEmpty:" + sprites.isEmpty()); //gameLoopThread.setState(STATE_WIN); //WIN 
          winstates.add(new WinState(winstates, this, x, y, bmpwinner,level)); 
          level = level + 1; 
          createSprites(); 
         } 
       }    
      } return true; 
    }  

}

Answer 1

私はあなたがこのクラスに変数すべてApplicationスコープを追加scope.If、あなたはアプリケーションのコンテキストでそれらをいつでもアクセスできるアプリケーションを持っているApplicationクラスを拡張するべきだと思います。

例::あなたが

Appdelegate appDel = ((Appdelegate) getApplicationContext()); 
boolean setting = appDel.soundsetting;//CAN ACCESS LIKE THIS 

いけないManifestFileでこのアプリケーションの参照を作ることを忘れ呼び出すことができることをアクセスするための今

public class Appdelegate extends Application{ 

public boolean soundsetting; 
//OTHER STUFFS 
} 

....

EDIT

<application android:icon="@drawable/icon" android:label="@string/app_name" 
    android:name="YOUR_APP_DELEGATE"> 
...................................... 
...................YOUR OTHER TAGS 

</application> 

希望すると助かります