製作方法在android

Question

中連續運行我正在製作一款Android遊戲，需要連續運行一個方法，就像一個計時器。我需要它每秒鐘都被調用。我怎樣才能使這可能？

Java代碼：

import java.util.ArrayList; 
import android.content.Context; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.graphics.Canvas; 
import android.graphics.Color; 
import android.graphics.Paint; 
import android.os.Bundle; 
import android.os.Handler; 
import android.os.Message; 
import android.view.MotionEvent; 
import android.view.SurfaceHolder; 
import android.view.SurfaceView; 
import android.widget.TextView; 
import android.widget.Toast; 

public class ExampleView extends SurfaceView implements SurfaceHolder.Callback 
{ 
class ExampleThread extends Thread 
{ 
    private ArrayList<Parachuter> parachuters; 
    private Bitmap parachuter; 
    private Paint black; 

    private boolean running; 

    private SurfaceHolder mSurfaceHolder; 
    private Context mContext; 
    private Handler mHandler; 
    private GameScreenActivity mActivity; 

    private long frameRate; 
    private boolean loading; 

    public ExampleThread(SurfaceHolder sHolder, Context context, Handler handler) 
    { 
     mSurfaceHolder = sHolder; 
     mHandler = handler; 
     mContext = context; 
     mActivity = (GameScreenActivity) context; 

     parachuters = new ArrayList<Parachuter>(); 
     parachuter = BitmapFactory.decodeResource(getResources(), R.drawable.parachuteman); 
     black = new Paint(); 
     black.setStyle(Paint.Style.FILL); 
     black.setColor(Color.WHITE); 

     running = true; 

     // This equates to 26 frames per second. 
     frameRate = (long) (1000/26); 
     loading = true; 
    } 

    @Override 
    public void run() 
    { 
     while (running) 
     { 
      Canvas c = null; 
      try 
      { 
       c = mSurfaceHolder.lockCanvas(); 

       synchronized (mSurfaceHolder) 
       { 
        long start = System.currentTimeMillis(); 
        doDraw(c); 
        long diff = System.currentTimeMillis() - start; 

        if (diff < frameRate) 
         Thread.sleep(frameRate - diff); 
       } 
      } catch (InterruptedException e) 
      { 
      } 
      finally 
      { 
       if (c != null) 
       { 
        mSurfaceHolder.unlockCanvasAndPost(c); 
       } 
      } 
     } 
    } 

    protected void doDraw(Canvas canvas) 
    { 
     canvas.drawRect(0, 0, canvas.getWidth(), canvas.getHeight(), black); 

     //Draw 
     for (int i = 0; i < parachuters.size(); i++) 
     { 
      canvas.drawBitmap(parachuter, parachuters.get(i).getX(), parachuters.get(i).getY(), null); 
      parachuters.get(i).tick(); 
     } 

     //Remove 
     for (int i = 0; i < parachuters.size(); i++) 
     { 
      if (parachuters.get(i).getY() > canvas.getHeight()) 
       parachuters.remove(i); 
     } 
    } 

    public boolean onTouchEvent(MotionEvent event) 
    { 
     if (event.getAction() != MotionEvent.ACTION_DOWN) 
      return false; 

     float x = event.getX(); 
     float y = event.getY(); 

     Parachuter p = new Parachuter(x, y); 
     parachuters.add(p); 
     Toast.makeText(getContext(), "x=" + x + " y=" + y, 15).show(); 

     return true; 
    } 
    public void setRunning(boolean bRun) 
    { 
     running = bRun; 
    } 

    public boolean getRunning() 
    { 
     return running; 
    } 
} 

/** Handle to the application context, used to e.g. fetch Drawables. */ 
private Context mContext; 

/** Pointer to the text view to display "Paused.." etc. */ 
private TextView mStatusText; 

/** The thread that actually draws the animation */ 
private ExampleThread eThread; 

public ExampleView(Context context) 
{ 
    super(context); 

    // register our interest in hearing about changes to our surface 
    SurfaceHolder holder = getHolder(); 
    holder.addCallback(this); 

    // create thread only; it's started in surfaceCreated() 
    eThread = new ExampleThread(holder, context, new Handler() 
    { 
     @Override 
     public void handleMessage(Message m) 
     { 
      // mStatusText.setVisibility(m.getData().getInt("viz")); 
      // mStatusText.setText(m.getData().getString("text")); 
     } 
    }); 

    setFocusable(true); 
} 

@Override 
public boolean onTouchEvent(MotionEvent event) 
{ 
    return eThread.onTouchEvent(event); 
} 

public ExampleThread getThread() 
{ 
    return eThread; 
} 

@Override 
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) 
{ 
    // TODO Auto-generated method stub 
} 

public void surfaceCreated(SurfaceHolder holder) 
{ 
    if (eThread.getState() == Thread.State.TERMINATED) 
    { 
     eThread = new ExampleThread(getHolder(), getContext(), getHandler()); 
     eThread.start(); 
    } 
    else 
    { 
     eThread.start(); 
    } 
} 

@Override 
public void surfaceDestroyed(SurfaceHolder holder) 
{ 
    boolean retry = true; 
    eThread.setRunning(false); 

    while (retry) 
    { 
     try 
     { 
      eThread.join(); 
      retry = false; 
     } 
     catch (InterruptedException e) 
     { 
     } 
    } 
} 
} 

我需要添加一個功能或所謂的「方法」，一個公共無效的或類似的東西，那應該叫每秒，應該做同樣的代碼作爲MotionEvent事件方法，onTouchEvent。

Answer 1

繼羅布的評論鏈接，考慮（這是不接受的答案，雖然）從Android開發者網站上查看本，參考資料：http://developer.android.com/resources/articles/timed-ui-updates.html

它描述瞭如何使用Android操作系統處理程序類來實現定時器，而不是自己使用Timer和TimerTask類。

Answer 2

這幾乎是你在找什麼。 How to run a Runnable thread in Android?

它使用一個線程每隔1000ms做一次。