Scrollview 嵌套 RecyclerView 及在Android 5.1版本滑动时 惯性消失问题
2015-11-16 17:13
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标签:scrollview android 滑动 嵌套
scrollview 嵌套recyclerview 时,recyclerview不显示,这就需要我们自己计算recyclerview的高度,比如:
这中方法适合item高度比较好计算的情形,但要遇到里面的item高度不一定这就需要我们重写recyclerview的高度了,以前嵌套listview的时候我们只需重写listview 然后重写
但是这种方法在recyclerview重写不管用。
我们此时要重写的的是LinearLayoutManager或GridLayoutManager
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重写完之后,用就好说了,在adapter的onBindview和平常一样用就可以了
此种方法在4.x系统上好用,能显示滑动也流畅,但是在5.x上虽然显示正常,但是滑动的时候好像被粘住了,没有惯性效果。。。。然后郁闷了一下午。。。。
最后解决方法是重写最外层的Scrollview
这样就可以了,暴力屏蔽。。。。5以上的事件直接传递给了内层的recyclerview,所以我们把滑动事件拦截就好了。。。
scrollview 嵌套recyclerview 时,recyclerview不显示,这就需要我们自己计算recyclerview的高度,比如:
ViewGroup.LayoutParams mParams = recyclerView.getLayoutParams(); mParams.height = (CommonUtils.getScreenWidthPX(getActivity()) * 480 / 720 + CommonUtils.dipToPixels(40)) * num + CommonUtils.dipToPixels(8); mParams.width = CommonUtils.getScreenWidthPX(getActivity()); recyclerView.setLayoutParams(mParams);
这中方法适合item高度比较好计算的情形,但要遇到里面的item高度不一定这就需要我们重写recyclerview的高度了,以前嵌套listview的时候我们只需重写listview 然后重写
@Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { // TODO Auto-generated method stub int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2, MeasureSpec.AT_MOST); super.onMeasure(widthMeasureSpec, expandSpec); }
但是这种方法在recyclerview重写不管用。
我们此时要重写的的是LinearLayoutManager或GridLayoutManager
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); Log.i(TAG, "onMeasure called. \nwidthMode " + widthMode + " \nheightMode " + heightSpec + " \nwidthSize " + widthSize + " \nheightSize " + heightSize + " \ngetItemCount() " + getItemCount()); 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);}privatevoidmeasureScrapChild(RecyclerView.Recycler recycler,int position,int widthSpec,int heightSpec,int[] measuredDimension){try{View view = recycler.getViewForPosition(0);//fix 动态添加时报IndexOutOfBoundsExceptionif(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{}}}
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public class FullyGridLayoutManager extends GridLayoutManager { private int mwidth = 0; private int mheight = 0; public FullyGridLayoutManager(Context context, int spanCount) { super(context, spanCount); } public FullyGridLayoutManager(Context context, int spanCount, int orientation, boolean reverseLayout) { super(context, spanCount, orientation, reverseLayout); } private int[] mMeasuredDimension = new int[2]; public int getMwidth() { return mwidth; } public void setMwidth(int mwidth) { this.mwidth = mwidth; } public int getMheight() { return mheight; } public void setMheight(int mheight) { this.mheight = mheight; } @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; int count = getItemCount(); int span = getSpanCount(); for (int i = 0; i < count; i++) { measureScrapChild(recycler, i, View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED), View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED), mMeasuredDimension); if (getOrientation() == HORIZONTAL) { if (i % span == 0) { width = width + mMeasuredDimension[0]; } if (i == 0) { height = mMeasuredDimension[1]; } } else { if (i % span == 0) { height = height + mMeasuredDimension[1]; }if(i ==0){ width = mMeasuredDimension[0];}}}switch(widthMode){caseView.MeasureSpec.EXACTLY: width = widthSize;caseView.MeasureSpec.AT_MOST:caseView.MeasureSpec.UNSPECIFIED:}switch(heightMode){caseView.MeasureSpec.EXACTLY: height = heightSize;caseView.MeasureSpec.AT_MOST:caseView.MeasureSpec.UNSPECIFIED:} setMheight(height); setMwidth(width); setMeasuredDimension(width, height);}privatevoidmeasureScrapChild(RecyclerView.Recycler recycler,int position,int widthSpec,int heightSpec,int[] measuredDimension){if(position < getItemCount()){try{View view = recycler.getViewForPosition(0);//fix 动态添加时报IndexOutOfBoundsExceptionif(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();}}}}
重写完之后,用就好说了,在adapter的onBindview和平常一样用就可以了
final FullyGridLayoutManager manager = new FullyGridLayoutManager(context.getActivity(), 3); manager.setOrientation(GridLayoutManager.VERTICAL); manager.setSmoothScrollbarEnabled(true); viewHolder.recyclerView.setLayoutManager(manager);
此种方法在4.x系统上好用,能显示滑动也流畅,但是在5.x上虽然显示正常,但是滑动的时候好像被粘住了,没有惯性效果。。。。然后郁闷了一下午。。。。
最后解决方法是重写最外层的Scrollview
** * 屏蔽 滑动事件 * Created by fc on 2015/7/16. */ public class MyScrollview extends ScrollView { private int downX; private int downY; private int mTouchSlop; public MyScrollview(Context context) { super(context); mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); } public MyScrollview(Context context, AttributeSet attrs) { super(context, attrs); mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); } public MyScrollview(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); } @Override public boolean onInterceptTouchEvent(MotionEvent e) { int action = e.getAction(); switch (action) { case MotionEvent.ACTION_DOWN: downX = (int) e.getRawX(); downY = (int) e.getRawY(); break; case MotionEvent.ACTION_MOVE: int moveY = (int) e.getRawY(); if (Math.abs(moveY - downY) > mTouchSlop) { return true; } } return super.onInterceptTouchEvent(e); } }
这样就可以了,暴力屏蔽。。。。5以上的事件直接传递给了内层的recyclerview,所以我们把滑动事件拦截就好了。。。
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