在android中触摸坐标后拖动图像

我正在制作一个android游戏，应该在我的触摸坐标在onTouchEvent（MotionEvent事件）方法后拖动图像。到目前为止，我已经设法通过点击来移动它，但不是通过拖动，我怎么能做到这一点？请帮助我，并提前感谢！看看我的onTouchEvent（MotionEvent事件）方法在此代码：在android中触摸坐标后拖动图像

package com.mysoftwaremobileapps.TriangleUnlocker; 

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.media.MediaPlayer; 
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 GameScreenActivity extends SurfaceView implements SurfaceHolder.Callback 
{ 
class ExampleThread extends Thread 
{ 
    private ArrayList<Triangle> triangles; 
    private Bitmap TriangleImage; 
    private Paint black; 

    private boolean running; 

    private SurfaceHolder mSurfaceHolder; 
    private Context mContext; 
    private Context mContext1; 
    private Handler mHandler; 
    private Handler mHandler1; 
    private TriangleUnlockerActivity mActivity; 

    private long frameRate; 
    private boolean loading; 
    public float x; 
    public float y; 
    public float x1; 
    public float y1; 
    public MediaPlayer mp1; 
    public int parachuterIndexToResetAndDelete; 
    public int canvasGetWidth; 
    public int livesLeftValue; 

    public ExampleThread(SurfaceHolder sHolder, Context context, Handler handler) 
    { 
     mSurfaceHolder = sHolder; 
     mHandler = handler; 
     mHandler1 = handler; 
     mContext = context; 
     mActivity = (TriangleUnlockerActivity) context; 

     triangles = new ArrayList<Triangle>(); 
     TriangleImage = BitmapFactory.decodeResource(getResources(), R.drawable.triangle); 
     black = new Paint(); 
     black.setStyle(Paint.Style.FILL); 
     black.setColor(Color.GRAY); 

     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); 
     canvasGetWidth = canvas.getWidth(); 

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

    public boolean onTouchEvent(MotionEvent event) 
    { 
     if (event.getAction() != MotionEvent.ACTION_DOWN) 
     Toast.makeText(getContext(), "onTouchEvent invoked. X= " + event.getX() + " Y= " + event.getY(), 15).show(); 
     x1 = event.getX(); 
     y1 = event.getY(); 

     for (Triangle p: triangles) { 
       Toast.makeText(getContext(), "Moving the triangle after touch cordinates", 25).show(); 
       p.posX = event.getX(); 
       p.posY = event.getY(); 
      return false; 
     } 
     return loading; 
    } 

    public void displayTriangles() 
    { 
     //Parachuter nr.1 
     x = 14; 
     y = 28; 

     Triangle p = new Triangle(x, y); 
     triangles.add(p); 
    } 

    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 GameScreenActivity(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) 
     { 
     } 
    } 
} 
}

来源

2012-04-01 user1183066