ScrollView实现图片滑动功能-创新互联
public class MyScrollView_1Activity extends Activity { int[] ids = new int[] { R.drawable.a1, R.drawable.a3, R.drawable.a4, R.drawable.a5}; private MyScrollView scrollView; private Context ctx; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // setContentView(R.layout.main); ctx = this; scrollView = new MyScrollView(this); ViewGroup.LayoutParams params = new ViewGroup.LayoutParams( ViewGroup.LayoutParams.FILL_PARENT, -1); for (int i = 0; i < ids.length; i++) { ImageView iv = new ImageView(this); iv.setBackgroundResource(ids[i]); scrollView.addView(iv, params); } setContentView(scrollView); } }
public class MyScrollView extends ViewGroup { private GestureDetector detector; private MyScrollView_1Activity ctx; private Scroller scroller; public MyScrollView(Context context) { super(context); this.ctx = (MyScrollView_1Activity) context; initView(); } @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { for (int i = 0; i < getChildCount(); i++) { View view = getChildAt(i); view.layout(1 + i * getWidth(), t, r + i * getWidth(), b); } } private void initView() { scroller = new Scroller(ctx); detector = new GestureDetector(new OnGestureListener() { @Override public boolean onSingleTapUp(MotionEvent e) { // TODO Auto-generated method stub return false; } @Override public void onShowPress(MotionEvent e) { // TODO Auto-generated method stub } @Override public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) { scrollBy((int) distanceX, 0); return false; } @Override public void onLongPress(MotionEvent e) { // TODO Auto-generated method stub } @Override public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { // TODO Auto-generated method stub return false; } @Override public boolean onDown(MotionEvent e) { // TODO Auto-generated method stub return false; } }); } @Override public boolean onTouchEvent(MotionEvent event) { detector.onTouchEvent(event); switch (event.getAction()) { case MotionEvent.ACTION_DOWN: break; case MotionEvent.ACTION_MOVE: break; case MotionEvent.ACTION_UP: moveToDest(); break; } return true; } public void moveToDest() { int dest = (getScrollX() + getWidth() / 2) / getWidth(); moveToDest(dest); } private void moveToDest(int dest) { int distance = dest * getWidth() - getScrollX(); scroller.startScroll(getScrollX(), 0, distance, 0); invalidate(); } @Override public void computeScroll() { if (scroller.computeScrollOffset()) { scrollTo(scroller.getCurrX(), 0); postInvalidate(); } } }创新互联公司长期为成百上千家客户提供的网站建设服务,团队从业经验10年,关注不同地域、不同群体,并针对不同对象提供差异化的产品和服务;打造开放共赢平台,与合作伙伴共同营造健康的互联网生态环境。为浦城企业提供专业的网站设计制作、成都做网站,浦城网站改版等技术服务。拥有10余年丰富建站经验和众多成功案例,为您定制开发。
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