공용 변수를 메인에서 호출하려면 어떻게합니까? 확장 활동

Question

저는 Android Java의 초보자입니다. 튜토리얼 Sprite 게임을 따라 조금 수정했지만 GameView에서 Main으로 변수를 가져 오려고하면 문제가 발생합니다. 사실 저는 GameView에서 Main의 getsetting()을 호출하려고합니다. 개발 화면에서는 괜찮아 보이지만 실행하면 오류가 발생합니다.

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

나는, 당신은 응용 프로그램의 맥락에서 그들에게 언제든지 액세스 할 수 있습니다 당신은이 클래스에 모든 응용 프로그램 범위 변수를 추가 scope.If 응용 프로그램을 가지고 Application 클래스를 확장한다고 생각합니다.

예 : 당신이

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

망가 ManifestFile에서이 응용 프로그램의 참조를 만들 것을 잊지 호출 할 수있는 액세스 이제

public class Appdelegate extends Application{ 

public boolean soundsetting; 
//OTHER STUFFS 
} 

....

편집

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

</application> 

희망이 당신을 도울 수 있습니다