今天做了這麼一個布局,scrollView嵌套一個fragment,fragment裡面是一個viewpager,viewpager裡面又嵌套fragment,fragment裡面有一個橫向的recycleview,recycleview裡面又是一個縱向的recycleview,同時scrollview還嵌套了Google提供的下拉重新整理。沒辦法,需求就是這個鬼樣子,被沖突弄得不要不要的,當然還是有解決辦法的;
沖突1:recycleview嵌套recycleview:現象,滑動時錯位,并且item之間的距離變大
解決:1.自定義一個FullLinnearLayoutManger:
public class FullyLinearLayoutManager extends LinearLayoutManager {
private static final String TAG = FullyLinearLayoutManager.class.getSimpleName();
public FullyLinearLayoutManager(Context context) {
super(context);
}
public FullyLinearLayoutManager(Context context, int orientation, boolean reverseLayout) {
super(context, orientation, reverseLayout);
}
private int[] mMeasuredDimension = new int[2];
@Override
public void onMeasure(RecyclerView.Recycler recycler, RecyclerView.State state,
int widthSpec, int heightSpec) {
final int widthMode = View.MeasureSpec.getMode(widthSpec);
final int heightMode = View.MeasureSpec.getMode(heightSpec);
final int widthSize = View.MeasureSpec.getSize(widthSpec);
final int heightSize = View.MeasureSpec.getSize(heightSpec);
int width = 0;
int height = 0;
for (int i = 0; i < getItemCount(); i++) {
measureScrapChild(recycler, i,
View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED),
View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED),
mMeasuredDimension);
if (getOrientation() == HORIZONTAL) {
width = width + mMeasuredDimension[0];
if (i == 0) {
height = mMeasuredDimension[1];
}
} else {
height = height + mMeasuredDimension[1];
if (i == 0) {
width = mMeasuredDimension[0];
}
}
}
switch (widthMode) {
case View.MeasureSpec.EXACTLY:
width = widthSize;
case View.MeasureSpec.AT_MOST:
case View.MeasureSpec.UNSPECIFIED:
}
switch (heightMode) {
case View.MeasureSpec.EXACTLY:
height = heightSize;
case View.MeasureSpec.AT_MOST:
case View.MeasureSpec.UNSPECIFIED:
}
setMeasuredDimension(width, height);
}
private void measureScrapChild(RecyclerView.Recycler recycler, int position, int widthSpec,
int heightSpec, int[] measuredDimension) {
try {
View view = recycler.getViewForPosition(0);//fix 動态添加時報IndexOutOfBoundsException
if (view != null) {
RecyclerView.LayoutParams p = (RecyclerView.LayoutParams) view.getLayoutParams();
int childWidthSpec = ViewGroup.getChildMeasureSpec(widthSpec,
getPaddingLeft() + getPaddingRight(), p.width);
int childHeightSpec = ViewGroup.getChildMeasureSpec(heightSpec,
getPaddingTop() + getPaddingBottom(), p.height);
view.measure(childWidthSpec, childHeightSpec);
measuredDimension[0] = view.getMeasuredWidth() + p.leftMargin + p.rightMargin;
measuredDimension[1] = view.getMeasuredHeight() + p.bottomMargin + p.topMargin;
recycler.recycleView(view);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
}
}
}
然後設定:
FullyLinearLayoutManager fullyLinearLayoutManager = new FullyLinearLayoutManager(getActivity());
fullyLinearLayoutManager.setOrientation(LinearLayoutManager.HORIZONTAL);
/**
* 當平滑滾動啟用時,滾動條把手的位置和大小基于可見條目的可見像素數來計算。
* 該處裡假定所有清單條目具有相同的高度。如果你使用條目高度不同的類表, 滾動條會在使用者滾動過程中改變大小。
* 為了避免這種情況,應該禁用該特性。 當平滑滾動被禁用後,滾動條把手的大小和位置隻是基于擴充卡中的條目數, 以及擴充卡中的可見條目來确定。
* 這樣可以為使用可變高條目清單的使用者, 提供穩定的滾動條。
*/
fullyLinearLayoutManager.setSmoothScrollbarEnabled(true);
//TODO 開啟自動測繪
fullyLinearLayoutManager.setAutoMeasureEnabled(true);
recyclerView.setLayoutManager(fullyLinearLayoutManager);
//設定不允許嵌套滑動,因為嵌套滑動的話會導緻錯亂
recyclerView.setNestedScrollingEnabled(false);
recyclerView.setAdapter(mAdapter);
2.scrollview與recycleview的沖突
将viewpager放在一個自定義的linearlayout裡面,然後重寫方法
/**
* 當事件,分發到該層時,調用requestDisallowInterceptTouchEvent,禁止該控件的父控件響應事件
* @param event
* @return
*/
@Override
public boolean onInterceptTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
Log.d("@@@", "onTouchEvent: ");
getParent().requestDisallowInterceptTouchEvent(true);
break;
}
return super.onInterceptTouchEvent(event);
}
3.滑動那個縱向recycleview的時候,總是被下拉重新整理事件搶占焦點
這個簡單了,将scrollview替換成NestscrollView就可以了,因為NestscrollView本來就是Google用來解決沖突事件,而開發的一個控件。
總結:上述方法:看似比較麻煩,還有點重複了,但是勝在穩定,可以完全杜絕沖突的情況發生。
zhey