我是Android新手。我想要实现一个左右移动的图片,并且当用户触摸图片的右侧时,它将向右移动。当用户触摸图片的左侧时,它将向左移动。但是图片将在x轴上预定义的点之间移动。
例如:图片将按顺序移动到p1(100,100),p2(150,100),p3(200,100),p4(250,100)。如果用户触摸p1的左侧,则它将保持当前位置。p4也会发生同样的情况。我可以将图像从p1移动到p2和从p2移动到p1。但是当我添加p3和p4时,它并不像我期望的那样工作。
这是我的GameView类。
public class GameView extends SurfaceView{
private Bitmap BG_image;
private SurfaceHolder holder;
//private GameLoopThread gameLoopThread;
int x;
int y;
private int srcX=100;
private int srcY=100;
int replaceX=0,areaThreshold=50;
int distance=50;
public GameView(Context context) {
super(context);
//gameLoopThread = new GameLoopThread(this);
holder = getHolder();
holder.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) {
/* gameLoopThread.setRunning(true);
gameLoopThread.start();*/
Canvas c = holder.lockCanvas(null);
onDraw(c);
holder.unlockCanvasAndPost(c);
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format,
int width, int height) {
}
});
BG_image = BitmapFactory.decodeResource(getResources(), R.drawable.icon);
Bitmap.createScaledBitmap(BG_image, BG_image.getWidth(), BG_image.getHeight(), false);
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
// TODO Auto-generated method stub
// x = (int) ev.getX();
// y = (int) ev.getY();
updateX(srcX);
replaceX=(int)ev.getX();
int StartX=0, EndX=0;
StartX=replaceX-areaThreshold;
EndX=replaceX+areaThreshold;
if(StartX<=100){
SurfaceHolder holder=getHolder();
Canvas myCanvas=holder.lockCanvas(null);
onDraw(myCanvas);
holder.unlockCanvasAndPost(myCanvas);
srcX=100;
}
else if(StartX>100 && StartX<250){
SurfaceHolder holder=getHolder();
Canvas myCanvas=holder.lockCanvas(null);
onDraw(myCanvas);
holder.unlockCanvasAndPost(myCanvas);
srcX=srcX+distance;
}
if(EndX>100 && EndX<250){
SurfaceHolder holder=getHolder();
Canvas myCanvas=holder.lockCanvas(null);
onDraw(myCanvas);
holder.unlockCanvasAndPost(myCanvas);
srcX=srcX-distance;
}
else if(EndX>250){
SurfaceHolder holder=getHolder();
Canvas myCanvas=holder.lockCanvas(null);
onDraw(myCanvas);
holder.unlockCanvasAndPost(myCanvas);
srcX=250;
}
return super.onTouchEvent(ev);
}
@Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
updateX(srcX);
Paint paint = new Paint();
canvas.drawColor(Color.BLACK);
canvas.drawRect(new Rect(0,0,getWidth(),getHeight()),paint);
canvas.drawBitmap(BG_image, srcX, srcY, null);
}
private int updateX(int srcX){
this.srcX =srcX;
return srcX ;
}
}
请查看我的代码并给出宝贵的建议以解决我的问题。 希望能尽快得到回复!
onDraw
,而应该只设置srcX值并调用invalidate
,这将告诉系统安排一个对onDraw
的调用。而且updateX
方法似乎没有任何作用。我认为你可以删除大约一半的代码。 - DocDude