Android的mp3交叉類

Question

我想在一個普通的類裏面使用MediaPlayer類播放mp3音效，這意味着非Activity。我的問題可能是初始化MediaPlayer對象，因爲我在非Activity類中沒有Context。這是如何解決的？

謝謝！

編輯

這裏是從哪裏函數應該叫一些代碼：

public class Bullet extends Thread{ 
public int bx = SniperActivity.bulletx; 
public int by = SniperActivity.bullety; 
Player obj = new Player(); 
SniperActivity con = new SniperActivity(); 


    public void shoot(){ 

    if (bx == Place.spotx && by == Place.spoty) 
    { 
      for (int f = 0; f<Rifle.dam; f++) 
    { 
       Player.life--; 
       if(Player.life<=0){ 
       obj.death(); 
    } 
    try { 
     Bullet.sleep(Rifle.rate); 
    } catch (InterruptedException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    } 
      } 
    } 
    int s = 0; 
    s++; 
    while (s == Rifle.magazine) 
    { 
     try { 
      Bullet.sleep(Rifle.relode); 
     } catch (InterruptedException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 
     s = 0; 
    } 
    con.Mplayer.start(); 
    } 
    } 

的函數被調用正確的在這裏，在「con.Mplayer.start（）」行，來自shoot（）函數。 con對象正在接受一個有Mplayer初始化的Activity，它試圖從這裏開始它。

下面是活動代碼：

public class SniperActivity extends Activity{ 


    private GameView game; 
    private Player player; 
    private Scop scope; 
    public static int scopx; 
    public static int scopy; 
    public static int bulletx; 
    public static int bullety; 
    public static String filename = "SharedData"; 
    static SharedPreferences someData; 
    public static int Width; 
    public static int Height; 
    public MediaPlayer Mplayer; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE); 

    Mplayer = MediaPlayer.create(SniperActivity.this, R.raw.shot); 

    someData = getSharedPreferences(filename, 0); 
    Height = someData.getInt("height", 480); 
    Width = someData.getInt("width", 480); 

    scopx = 1; 
    scopy = 1; 

    PlayerView playerview; 
    playerview = new PlayerView(this, player); 
    ScopView Scope; 
    Scope = new ScopView(this, scope); 

    this.game = new GameView(this); 
    game.setviews(playerview, Scope); 
    setContentView(game); 
    int screenWidth,screenHeight; 
    screenWidth = this.getWindowManager().getDefaultDisplay().getWidth(); 
    screenHeight = this.getWindowManager().getDefaultDisplay().getHeight(); 
    bulletx = screenWidth/2; 
    bullety = screenHeight/2; 
} 
@Override 
public boolean onTouchEvent(MotionEvent event) 
{ 
    float dx; 
    Bullet bullet = new Bullet(); 
    //get the x coordinate of users' press 
    dx = event.getX(); 
    if (dx >=0) 
    { 
     bullet.shoot(); 
    } 
    return true; 
} 

public void onDeath(){ 
    finish(); 
} 


} 

Answer 1

試圖通過Context在簡單的java文件

PlayMp3 mp3 = new PlayMp3(getApplicatonContext());