RecyclerView横向和竖向滑动冲突

最新推荐文章于 2024-06-17 14:06:42 发布

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最新推荐文章于 2024-06-17 14:06:42 发布

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分类专栏： Android高级UI绘制文章标签： AndroidUI绘制 Android

本文链接：https://blog.youkuaiyun.com/linkuiyao/article/details/73696811

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本文介绍了一种改进版的RecyclerView组件，该组件增强了触摸拦截行为并优化了滚动体验。通过调整触摸阈值，它能够更好地判断何时开始滚动，从而提升用户体验。

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import android.content.Context;
import android.support.annotation.Nullable;
import android.support.v4.view.MotionEventCompat;
import android.support.v4.view.ViewConfigurationCompat;
import android.support.v7.widget.RecyclerView;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.ViewConfiguration;

public class BetterRecyclerView extends RecyclerView {
private int touchSlop;
private Context mContext;
private int INVALID_POINTER = -1;
private int scrollPointerId = INVALID_POINTER;
private int initialTouchX;
private int initialTouchY;
private final static String TAG = "BetterRecyclerView";

public BetterRecyclerView(Context context) {
// super(context);
this(context, null);
}

public BetterRecyclerView(Context context, @Nullable AttributeSet attrs) {
// super(context, attrs);
this(context, attrs, 0);
}

public BetterRecyclerView(Context context, @Nullable AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
ViewConfiguration vc = ViewConfiguration.get(context);
touchSlop = vc.getScaledEdgeSlop();
mContext = context;
}

@Override
public void setScrollingTouchSlop(int slopConstant) {
super.setScrollingTouchSlop(slopConstant);
ViewConfiguration vc = ViewConfiguration.get(mContext);
switch (slopConstant) {
case TOUCH_SLOP_DEFAULT:
touchSlop = vc.getScaledTouchSlop();
break;
case TOUCH_SLOP_PAGING:
touchSlop = ViewConfigurationCompat.getScaledPagingTouchSlop(vc);
break;

}
}

@Override
public boolean onInterceptTouchEvent(MotionEvent e) {
if (e == null) {
return false;
}
int action = MotionEventCompat.getActionMasked(e);
int actionIndex = MotionEventCompat.getActionIndex(e);
switch (action) {
case MotionEvent.ACTION_DOWN :
scrollPointerId = MotionEventCompat.getPointerId(e, 0);
initialTouchX = Math.round(e.getX() + 0.5f);
initialTouchY = Math.round(e.getY() + 0.5f);
return super.onInterceptTouchEvent(e);
case MotionEvent.ACTION_POINTER_DOWN:
scrollPointerId = MotionEventCompat.getPointerId(e, actionIndex);
initialTouchX = Math.round(MotionEventCompat.getX(e, actionIndex) + 0.5f);
initialTouchY = Math.round(MotionEventCompat.getY(e, actionIndex) + 0.5f);
return super.onInterceptTouchEvent(e);
case MotionEvent.ACTION_MOVE:
int index = MotionEventCompat.findPointerIndex(e, scrollPointerId);
if (index < 0) {
return false;
}
int x = Math.round(MotionEventCompat.getX(e, index) + 0.5f);
int y = Math.round(MotionEventCompat.getY(e, index) + 0.5f);
if (getScrollState() != SCROLL_STATE_DRAGGING ) {
int dx = x - initialTouchX;
int dy = y - initialTouchY;
boolean startScroll = false;
//将斜率添加进来，这样可以减少 startScroll 为true 的机会。这个机会就会给需要这个返回值
if (getLayoutManager().canScrollHorizontally() && Math.abs(dx) > touchSlop &&
Math.abs(dx) > Math.abs(dy)) {
startScroll = true;
}
if(getLayoutManager().canScrollVertically() && Math.abs(dy) > touchSlop &&
Math.abs(dy) > Math.abs(dx)) {
startScroll = true;
}
Log.d(TAG, "startScroll: " + startScroll);
return startScroll && super.onInterceptTouchEvent(e);
}
return super.onInterceptTouchEvent(e);
default:
return super.onInterceptTouchEvent(e);
}
}
}