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我正在尝试使用普通类中的 MediaPlayer 类播放 mp3 声音，这意味着非活动。我的问题可能是初始化 MediaPlayer 对象，因为我在非 Activity 类中没有上下文。这如何解决？

谢谢！

编辑

这是应该调用函数的一些代码：

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();
   }
   }

该函数在此处调用，在“con.Mplayer.start()”行中，来自 shoot() 函数。con 对象正在引用一个已在其中初始化 Mplayer 的 Activity，它正试图从这里启动它。

这是活动代码：

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();
}


}
4

1 回答 1

1

尝试传入Context简单java文件的构造函数

PlayMp3 mp3 = new PlayMp3(getApplicatonContext());
于 2012-04-21T15:18:30.113 回答