ScrollView嵌套RecyclerView、ListView时解决布局问题

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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。

重写recyclerView的方法：

public class MyRecyclerView extends RecyclerView{    public MyRecyclerView(Context context) {        super(context);    }    public MyRecyclerView(Context context, AttributeSet attrs) {        super(context, attrs);    }    public MyRecyclerView(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);    }    @Override    protected void onMeasure(int widthSpec, int heightSpec) {        int newHeightSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2,MeasureSpec.AT_MOST);        super.onMeasure(widthSpec, newHeightSpec);    }}

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

重写LinearLayoutManager

public class MyLinearLayoutManger extends LinearLayoutManager{    private static final String TAG = MyLinearLayoutManger.class.getSimpleName();    private int[] mMeasuredDimension = new int[2];    public MyLinearLayoutManger(Context context) {        super(context);    }    public MyLinearLayoutManger(Context context, int orientation, boolean reverseLayout) {        super(context, orientation, reverseLayout);    }    public MyLinearLayoutManger(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {        super(context, attrs, defStyleAttr, defStyleRes);    }    @Override    public void onMeasure(RecyclerView.Recycler recycler, RecyclerView.State state, int widthSpec, int heightSpec) {        super.onMeasure(recycler, state, widthSpec, 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);        KLog.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);    }    private void measureScrapChild(RecyclerView.Recycler recycler, int position, int widthSpec,                                   int heightSpec, int[] measuredDimension) {        try {            View view = recycler.getViewForPosition(0);//fix 动态添加时报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();        }    }}

重写GridLayoutManager

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) {            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:        }        setMheight(height);        setMwidth(width);        setMeasuredDimension(width, height);    }    private void measureScrapChild(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();            }        }    }}

重写完之后，用就好说了，在adapter的onBindview和平常一样用就可以了

mLinearLayoutManager = new MyLinearLayoutManger(this);suggest_list_recycler.setLayoutManager(mLinearLayoutManager); //添加分隔线 RecyclerViewsuggest_list_recycler.addItemDecoration(new AdvanceDecoration(EventActivity.this, OrientationHelper.VERTICAL));suggest_list_recycler.setAdapter(adapter = new EventSuggestListAdapter(EventActivity.this, eventSuggestModel.list));

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。
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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ScrollView嵌套ListView只显示一行之计算的高度不正确的解决办法:

参考：http://blog.csdn.net/spring_he/article/details/17409661

1.在类中添加setListViewHeightBasedOnChildren(ListView listView)方法；

 /**     * @param  listview     * 此方法是本次listview嵌套listview的核心方法：计算parentlistview item的高度。     * 如果不使用此方法，无论innerlistview有多少个item，则只会显示一个item。     **/    public void setListViewHeightBasedOnChildren(ListView listView) {        // 获取ListView对应的Adapter        ListAdapter listAdapter = listView.getAdapter();        if (listAdapter == null) {        return;    }        int totalHeight = 0;        for (int i = 0, len = listAdapter.getCount(); i < len; i++) {            // listAdapter.getCount()返回数据项的数目            View listItem = listAdapter.getView(i, null, listView);            // 计算子项View 的宽高            listItem.measure(0, 0);            // 统计所有子项的总高度            totalHeight += listItem.getMeasuredHeight();        }        ViewGroup.LayoutParams params = listView.getLayoutParams();        params.height = totalHeight+ (listView.getDividerHeight() * (listAdapter.getCount() - 1));        listView.setLayoutParams(params);    }

2.在activity类中这样使用

<span style="font-family: Arial, Helvetica, sans-serif;">parentAdapter = new ParentAdapter(MainActivity.this,parentList);</span><pre name="code" class="java">act_listview.setAdapter(parentAdapter);setListViewHeightBasedOnChildren(act_listview);

3.需要将activity中布局文件的listview和scrollview的宽高设置为match_parent;并将scrollview添加属性android：fillViewport = "true"。

布局activity_main如下：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical">    <ScrollView        android:layout_width="match_parent"        android:layout_height="match_parent"        android:fillViewport="true">        <ListView            android:id="@+id/act_listview"            android:layout_width="match_parent"            android:layout_height="match_parent" />    </ScrollView></LinearLayout>

4.将外层adapter和里层adapter的布局文件都已LinearLayout作为根布局。

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical">    <TextView        android:id="@+id/children_country_tv"        android:layout_width="match_parent"        android:layout_height="wrap_content" /></LinearLayout>

总结：

解决方案：

（1）ListView不能用自定义的，必须用原生的ListView；

（2）ListView的宽高都用 match_parent或fill_parent；

（3）用计算高度的方式去实现setListViewHeightBasedOnChildren(ListView)；

（4）adapter的item的根布局必须为LinearLayout布局，不然计算高度时会有问题；

（5）ScrollView中添加属性 android:fillViewport="true"

利用以上的5点，基本可以解决问题，我是这样解决，如果有没有解决的，请注意布局上看看有什么问题，把多余的功能去掉，从最基本的只显示ListView开始调节，一个功能一个功能的加上去，看看是哪里出问题，就逐步排除并解决。

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listview中嵌套子listview,解决子listview点击问题:

1.在子listview的item最外面的一层布局LinearLayout 添加 android:descendantFocusability="blocksDescendants"属性；

2.在父listview中添加android:focusable="false" 属性；或者换种思路 listview中嵌入gridview,就不会出现无响应事件

android:descendantFocusability="blocksDescendants" //viewgroup会覆盖子类控件而直接获得焦点android:descendantFocusability="beforeDescendants"　//viewgroup会优先其子类控件而获取到焦点  android:descendantFocusability="afterDescendants"   //viewgroup只有当其子类控件不需要获取焦点时才获取焦点

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