滾動(dòng)視圖觸摸處理中的HorizontalScrollView我有一個(gè)滾動(dòng)視圖圍繞我的整個(gè)布局，使整個(gè)屏幕是可滾動(dòng)的。我在這個(gè)ScrollView中擁有的第一個(gè)元素是HorizontalScrollView塊，它具有可以水平滾動(dòng)的功能。我在水平滾動(dòng)視圖中添加了一個(gè)ontouch偵聽器，以處理觸摸事件，并強(qiáng)制視圖“快照”到action_up事件上最接近的圖像。所以我想要的效果就像股票Android的主屏幕，你可以從一個(gè)屏幕滾動(dòng)到另一個(gè)屏幕，當(dāng)你舉起手指的時(shí)候它會(huì)點(diǎn)擊到一個(gè)屏幕上。這一切都很好，除了一個(gè)問題：我需要從左到右滑動(dòng)幾乎完全水平，一個(gè)action_up永遠(yuǎn)注冊(cè)。如果我最不垂直地滑動(dòng)(我認(rèn)為很多人傾向于在手機(jī)上來回滑動(dòng))，我將收到action_Cancel而不是action_up。我的理論是，這是因?yàn)樗綕L動(dòng)視圖在滾動(dòng)視圖中，而滾動(dòng)視圖正在劫持垂直觸摸以允許垂直滾動(dòng)。如何從水平滾動(dòng)視圖中禁用滾動(dòng)視圖的觸摸事件，但仍然允許在滾動(dòng)視圖的其他地方正常垂直滾動(dòng)？下面是我的代碼示例：public class HomeFeatureLayout extends HorizontalScrollView {private ArrayList<ListItem> items = null;
private GestureDetector gestureDetector;View.OnTouchListener gestureListener;private static final int SWIPE_MIN_DISTANCE = 5;
private static final int SWIPE_THRESHOLD_VELOCITY = 300;private int activeFeature = 0;
public HomeFeatureLayout(Context context, ArrayList<ListItem> items){
super(context);
setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
setFadingEdgeLength(0);
this.setHorizontalScrollBarEnabled(false);
this.setVerticalScrollBarEnabled(false);
LinearLayout internalWrapper = new LinearLayout(context);
internalWrapper.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
internalWrapper.setOrientation(LinearLayout.HORIZONTAL);
addView(internalWrapper);
this.items = items;
for(int i = 0; i< items.size();i++){
LinearLayout featureLayout = (LinearLayout) View.inflate(this.getContext(),R.layout.homefeature,null);
TextView header = (TextView) featureLayout.findViewById(R.id.featureheader);
ImageView image = (ImageView) featureLayout.findViewById(R.id.featureimage);
TextView title = (TextView) featureLayout.findViewById(R.id.featuretitle);
3 回答
叮當(dāng)貓咪
TA貢獻(xiàn)1776條經(jīng)驗(yàn) 獲得超12個(gè)贊
public class CustomScrollView extends ScrollView {
private GestureDetector mGestureDetector;
public CustomScrollView(Context context, AttributeSet attrs) {
super(context, attrs);
mGestureDetector = new GestureDetector(context, new YScrollDetector());
setFadingEdgeLength(0);
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
return super.onInterceptTouchEvent(ev) && mGestureDetector.onTouchEvent(ev);
}
// Return false if we're scrolling in the x direction
class YScrollDetector extends SimpleOnGestureListener {
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
return Math.abs(distanceY) > Math.abs(distanceX);
}
}}
慕無忌1623718
TA貢獻(xiàn)1744條經(jīng)驗(yàn) 獲得超4個(gè)贊
我簡(jiǎn)化了代碼(不需要GestureDetector)達(dá)到同樣的效果：
public?class?VerticalScrollView?extends?ScrollView?{
????private?float?xDistance,?yDistance,?lastX,?lastY;
????public?VerticalScrollView(Context?context,?AttributeSet?attrs)?{
????????super(context,?attrs);
????}
????@Override
????public?boolean?onInterceptTouchEvent(MotionEvent?ev)?{
????????switch?(ev.getAction())?{
????????????case?MotionEvent.ACTION_DOWN:
????????????????xDistance?=?yDistance?=?0f;
????????????????lastX?=?ev.getX();
????????????????lastY?=?ev.getY();
????????????????break;
????????????case?MotionEvent.ACTION_MOVE:
????????????????final?float?curX?=?ev.getX();
????????????????final?float?curY?=?ev.getY();
????????????????xDistance?+=?Math.abs(curX?-?lastX);
????????????????yDistance?+=?Math.abs(curY?-?lastY);
????????????????lastX?=?curX;
????????????????lastY?=?curY;
????????????????if(xDistance?>?yDistance)
????????????????????return?false;
????????}
????????return?super.onInterceptTouchEvent(ev);
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