ViewPager嵌套ListView滑動衝突解決,ViewPager內容按照元素最大高度顯示
效果圖:
矩形區域是可以橫向滑動的,裏面嵌套listview,若不處理,容易出現滑動衝突。
參考代碼:自定義ViewPager
package com.**.common.view;
import android.content.Context;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
public class ViewPagerCompat extends ViewPager {
private float xDistance, yDistance, xLast, yLast;
private int mMaxHeight;
public ViewPagerCompat(Context context) {
super(context);
}
public ViewPagerCompat(Context context, AttributeSet attrs) {
super(context, attrs);
}
/**
* 橫向滑動時ViewPager攔截事件,處理viewpager嵌套listview滑動衝突,增加邏輯 xDistance > 10,防止點擊事件不生效
*/
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
xDistance = yDistance = 0f;
xLast = ev.getX();
yLast = ev.getY();
break;
case MotionEvent.ACTION_MOVE:
final float curX = ev.getX();
final float curY = ev.getY();
xDistance += Math.abs(curX - xLast);
yDistance += Math.abs(curY - yLast);
xLast = curX;
yLast = curY;
if (xDistance > yDistance && xDistance > 10) {
return true;
}
}
return super.onInterceptTouchEvent(ev);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int height = 0;
for (int i = 0; i < getChildCount(); i++) {
View child = getChildAt(i);
child.measure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
int h = child.getMeasuredHeight();
height = Math.max(h, mMaxHeight); // 按照最大高度顯示
mMaxHeight = height;
}
heightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY);
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}
複寫onInterceptTouchEvent,可以解決橫向滑動時,listview與viewpager衝突。增加移動距離 xDistance > 10,的判斷,是爲防止點擊事件也被攔截,導致listview元素點擊無效。
複寫onMeasure,可以根據內容子View高度顯示viewPager高度。取最大子View高度,可以保證viewPager按照最大的高度顯示,避免滑動過程中出現高度變化。
以上僅供參考~~