移動的紅色小球

跟隨指頭運動的紅色小球，代碼簡單

public class DrawView extends View{

	public DrawView(Context context) {
		super(context);
		// TODO Auto-generated constructor stub
	}
	public float currentx=40;
	public float currenty=50;
	@Override
	protected void onDraw(Canvas canvas) {
		// TODO Auto-generated method stub
		super.onDraw(canvas);
		Paint paint =new Paint();
		paint.setColor(Color.RED);
		canvas.drawCircle(currentx, currenty, 30, paint);
		
	}
	
}

public class BallActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        LinearLayout layout=(LinearLayout)findViewById(R.id.root);
        final DrawView drawView=new DrawView(this);
        //drawView.setMinimumWidth(300);
        //drawView.setMinimumHeight(500);
        drawView.setOnTouchListener(new OnTouchListener() {
			
			public boolean onTouch(View v, MotionEvent event) {
				// TODO Auto-generated method stub
				drawView.currentx=event.getX();
				drawView.currenty=event.getY();
				drawView.invalidate(); //刷新
				return true;
			}
		});
        layout.addView(drawView);
    }

}

附上demo下載地址：移動小球