废了好大的劲才弄好的,记下来 方便以后查看

  1. public class MainActivity extends AppCompatActivity {
  2.  
  3. private RecyclerView mRecyclerView;
  4. private List<String> mDatas;
  5. private HomeAdapter mAdapter;
  6.  
  7. @Override
  8. protected void onCreate(Bundle savedInstanceState) {
  9. super.onCreate(savedInstanceState);
  10. setContentView(R.layout.activity_main);
  11.  
  12. initData();
  13.  
  14. mRecyclerView = (RecyclerView) findViewById(R.id.id_recyclerview);
  15. //设置布局管理器
  16. mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
  17. //设置adapter
  18. mRecyclerView.setAdapter(mAdapter = new HomeAdapter());
  19.  
  20. }
  21.  
  22. protected void initData() {
  23. mDatas = new ArrayList<String>();
  24. for (int i = 'A'; i < 'z'; i++) {
  25. mDatas.add("" + (char) i);
  26. }
  27. }
  28.  
  29. class HomeAdapter extends RecyclerView.Adapter<HomeAdapter.MyViewHolder> {
  30.  
  31. @Override
  32. public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
  33. MyViewHolder holder = new MyViewHolder(LayoutInflater.from(
  34. MainActivity.this).inflate(R.layout.item_home, parent,
  35. false));
  36. return holder;
  37. }
  38.  
  39. @Override
  40. public void onBindViewHolder(MyViewHolder holder, int position) {
  41. holder.tv.setText(mDatas.get(position));
  42. }
  43.  
  44. @Override
  45. public int getItemCount() {
  46. return mDatas.size();
  47. }
  48.  
  49. class MyViewHolder extends RecyclerView.ViewHolder {
  50.  
  51. TextView tv;
  52.  
  53. public MyViewHolder(View view) {
  54. super(view);
  55. tv = (TextView) view.findViewById(R.id.id_num);
  56. }
  57. }
  58. }

  然后是最关键的NestedScrollview 是为了配合嵌套滑动的,  NestedScrollview最关键有两个接口的实现 一个是 NestedScrollingChild  一个是NestedScrollingParent

先是NestedScrollingParent

  1. public class MyNestedScrollParent extends LinearLayout implements NestedScrollingParent {
  2. private String Tag = "MyNestedScrollParent";
  3. private View topView ;
  4. private View centerView;
  5. private View contentView;
  6. private MyNestedScrollChildL nsc ;
  7. private NestedScrollingParentHelper mParentHelper;
  8. private int imgHeight;
  9. private int tvHeight;
  10. private int mLastTouchY;
  11. public boolean topShow;
  12.  
  13. public MyNestedScrollParent(Context context, AttributeSet attrs) {
  14. super(context, attrs);
  15. init();
  16. }
  17.  
  18. public MyNestedScrollParent(Context context) {
  19. super(context);
  20. init();
  21. }
  22.  
  23. @Override
  24. protected void onFinishInflate() {
  25. super.onFinishInflate();
  26. topView = getChildAt(0);
  27. centerView = getChildAt(1);
  28. contentView = getChildAt(2);
  29. topView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
  30. @Override
  31. public void onGlobalLayout() {
  32. if(imgHeight<=0){
  33. imgHeight = topView.getMeasuredHeight();
  34. Log.i(Tag,"imgHeight:"+imgHeight+",tvHeight:"+tvHeight);
  35. }
  36. }
  37. });
  38. centerView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
  39. @Override
  40. public void onGlobalLayout() {
  41. if(tvHeight<=0){
  42. tvHeight = centerView.getMeasuredHeight();
  43. Log.i(Tag,"imgHeight:"+imgHeight+",tvHeight:"+tvHeight);
  44. }
  45. }
  46. });
  47.  
  48. }
  49. @Override
  50. protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
  51. {
  52. super.onMeasure(widthMeasureSpec, heightMeasureSpec);
  53. setMeasuredDimension(getMeasuredWidth(), topView.getMeasuredHeight() + centerView.getMeasuredHeight() + contentView.getMeasuredHeight());
  54.  
  55. }
  56. public int getTopViewHeight(){
  57. Log.i(Tag,"getTopViewHeight--"+topView.getMeasuredHeight());
  58. return topView.getMeasuredHeight();
  59. }
  60.  
  61. @Override
  62. public boolean onStartNestedScroll(View child, View target, int nestedScrollAxes) {
  63. Log.i(Tag,"onStartNestedScroll--"+"child:"+child+",target:"+target+",nestedScrollAxes:"+nestedScrollAxes);
  64. return true;
  65. }
  66. private void init() {
  67. mParentHelper = new NestedScrollingParentHelper(this);
  68.  
  69. }
  70.  
  71. @Override
  72. public void onNestedScrollAccepted(View child, View target, int nestedScrollAxes) {
  73. Log.i(Tag,"onNestedScrollAccepted"+"child:"+child+",target:"+target+",nestedScrollAxes:"+nestedScrollAxes);
  74. mParentHelper.onNestedScrollAccepted(child, target, nestedScrollAxes);
  75. }
  76.  
  77. @Override
  78. public void onStopNestedScroll(View target) {
  79. Log.i(Tag,"onStopNestedScroll--target:"+target);
  80. mParentHelper.onStopNestedScroll(target);
  81. }
  82.  
  83. @Override
  84. public void onNestedScroll(View target, int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed) {
  85. Log.i(Tag,"onNestedScroll--"+"target:"+target+",dxConsumed"+dxConsumed+",dyConsumed:"+dyConsumed
  86. +",dxUnconsumed:"+dxUnconsumed+",dyUnconsumed:"+dyUnconsumed);
  87. }
  88.  
  89. @Override
  90. public void onNestedPreScroll(View target, int dx, int dy, int[] consumed) {
  91.  
  92. if(showImg(dy)||hideImg(dy)){//如果父亲自己要滑动,则拦截
  93. consumed[1]=dy;
  94. scrollBy(0,dy);
  95. Log.i("onNestedPreScroll","Parent滑动:"+dy);
  96. }
  97. Log.i(Tag,"onNestedPreScroll--getScrollY():"+getScrollY()+",dx:"+dx+",dy:"+dy+",consumed:"+consumed);
  98. }
  99.  
  100. @Override
  101. public boolean onNestedFling(View target, float velocityX, float velocityY, boolean consumed) {
  102. Log.i(Tag,"onNestedFling--target:"+target);
  103. return false;
  104. }
  105.  
  106. @Override
  107. public boolean onNestedPreFling(View target, float velocityX, float velocityY) {
  108. Log.i(Tag,"onNestedPreFling--target:"+target);
  109. return false;
  110. }
  111.  
  112. @Override
  113. public int getNestedScrollAxes() {
  114. Log.i(Tag,"getNestedScrollAxes");
  115. return 0;
  116. }
  117.  
  118. @Override
  119. public void scrollTo(int x, int y) {
  120. if(y<0){
  121. y=0;
  122. }
  123. if(y>imgHeight){
  124. y=imgHeight;
  125. }
  126.  
  127. super.scrollTo(x, y);
  128. }
  129.  
  130. /**
  131. 下拉的时候是否要向下滑动显示图片
  132. */
  133. public boolean showImg(int dy){
  134. if(dy<0){
  135.  
  136. // if(getScrollY()>0&&nsc.getScrollY()==0){//如果parent外框,还可以往上滑动
  137. if(getScrollY()>0){
  138.  
  139. return true;
  140. }
  141. }
  142.  
  143. return false;
  144. }
  145.  
  146. /**
  147. * 上拉的时候,是否要向上滑动,隐藏图片
  148. * @return
  149. */
  150. public boolean hideImg(int dy){
  151. if(dy>0){
  152. if(getScrollY()<imgHeight){//如果parent外框,还可以往下滑动
  153. return true;
  154. }
  155. }
  156. return false;
  157. }
  158.  
  159. @Override
  160. public boolean onTouchEvent(MotionEvent event) {
  161. if(event.getAction()==MotionEvent.ACTION_DOWN){
  162. return true;
  163. }
  164. return super.onTouchEvent(event);
  165. }
  166. @Override
  167. public boolean onInterceptTouchEvent(MotionEvent event) {
  168.  
  169. return super.onInterceptTouchEvent(event);
  170. }
  171.  
  172. @Override
  173. public boolean dispatchTouchEvent(MotionEvent event) {
  174. Log.i("aaa","getY():getRawY:"+event.getRawY());
  175.  
  176. switch (event.getAction()){
  177. case MotionEvent.ACTION_DOWN:
  178. mLastTouchY = (int) (event.getRawY() + 0.5f);
  179.  
  180. break;
  181. case MotionEvent.ACTION_MOVE:
  182. int y = (int) (event.getRawY() + 0.5f);
  183. int dy = mLastTouchY - y;
  184. mLastTouchY = y;
  185. if(showImg(dy)||hideImg(dy)){//如果父亲自己要滑动
  186. scrollBy(0,dy);
  187. }
  188. break;
  189. case MotionEvent.ACTION_UP:
  190.  
  191. break;
  192. }
  193.  
  194. return super.dispatchTouchEvent(event);
  195. }
  196.  
  197. }

然后是NestedScrollingChild

  1. public class MyNestedScrollChild extends ScrollView implements NestedScrollingChild {
  2. private String Tag = "MyNestedScrollChild";
  3. private NestedScrollingChildHelper mScrollingChildHelper;
  4.  
  5. public MyNestedScrollChild(Context context) {
  6. super(context);
  7. init(context);
  8. }
  9.  
  10. public MyNestedScrollChild(Context context, AttributeSet attrs) {
  11. super(context, attrs);
  12. init(context);
  13. }
  14.  
  15. public MyNestedScrollChild(Context context, AttributeSet attrs, int defStyleAttr) {
  16. super(context, attrs, defStyleAttr);
  17. init(context);
  18. }
  19.  
  20. public void init(Context context) {
  21. final ViewConfiguration configuration = ViewConfiguration.get(context);
  22.  
  23. }
  24.  
  25. @Override
  26. public void setNestedScrollingEnabled(boolean enabled) {
  27. Log.i(Tag, "setNestedScrollingEnabled:" + enabled);
  28. getScrollingChildHelper().setNestedScrollingEnabled(enabled);
  29. }
  30.  
  31. @Override
  32. public boolean isNestedScrollingEnabled() {
  33. Log.i(Tag, "isNestedScrollingEnabled");
  34. return getScrollingChildHelper().isNestedScrollingEnabled();
  35. }
  36.  
  37. @Override
  38. public boolean startNestedScroll(int axes) {
  39.  
  40. boolean bl = getScrollingChildHelper().startNestedScroll(axes);
  41. Log.i(Tag, "startNestedScroll:axes=" + axes + ",bl:" + bl);
  42. Log.i(Tag, "hasNestedScrollingParent=" + getScrollingChildHelper().hasNestedScrollingParent());
  43. return bl;
  44. }
  45.  
  46. @Override
  47. public void stopNestedScroll() {
  48. Log.i(Tag, "stopNestedScroll");
  49. getScrollingChildHelper().stopNestedScroll();
  50. }
  51.  
  52. @Override
  53. public boolean hasNestedScrollingParent() {
  54. Log.i(Tag, "hasNestedScrollingParent");
  55. return getScrollingChildHelper().hasNestedScrollingParent();
  56. }
  57.  
  58. @Override
  59. public boolean dispatchNestedScroll(int dxConsumed, int dyConsumed, int dxUnconsumed,
  60. int dyUnconsumed, int[] offsetInWindow) {
  61. Log.i(Tag, "dispatchNestedScroll:dxConsumed:" + dxConsumed + "," +
  62. "dyConsumed:" + dyConsumed + ",dxUnconsumed:" + dxUnconsumed + ",dyUnconsumed:" +
  63. dyUnconsumed + ",offsetInWindow:" + offsetInWindow);
  64. return getScrollingChildHelper().dispatchNestedScroll(dxConsumed, dyConsumed,
  65. dxUnconsumed, dyUnconsumed, offsetInWindow);
  66. }
  67.  
  68. @Override
  69. public boolean dispatchNestedPreScroll(int dx, int dy, int[] consumed, int[] offsetInWindow) {
  70. Log.i(Tag, "dispatchNestedPreScroll:dx" + dx + ",dy:" + dy + ",consumed:" + consumed + ",offsetInWindow:" + offsetInWindow);
  71. return getScrollingChildHelper().dispatchNestedPreScroll(dx, dy, consumed, offsetInWindow);
  72. }
  73.  
  74. @Override
  75. public boolean dispatchNestedFling(float velocityX, float velocityY, boolean consumed) {
  76. Log.i(Tag, "dispatchNestedFling:velocityX:" + velocityX + ",velocityY:" + velocityY + ",consumed:" + consumed);
  77. return getScrollingChildHelper().dispatchNestedFling(velocityX, velocityY, consumed);
  78. }
  79.  
  80. @Override
  81. public boolean dispatchNestedPreFling(float velocityX, float velocityY) {
  82. Log.i(Tag, "dispatchNestedPreFling:velocityX:" + velocityX + ",velocityY:" + velocityY);
  83. return getScrollingChildHelper().dispatchNestedPreFling(velocityX, velocityY);
  84. }
  85.  
  86. private NestedScrollingChildHelper getScrollingChildHelper() {
  87. if (mScrollingChildHelper == null) {
  88. mScrollingChildHelper = new NestedScrollingChildHelper(this);
  89. mScrollingChildHelper.setNestedScrollingEnabled(true);
  90. }
  91. return mScrollingChildHelper;
  92. }
  93.  
  94. @Override
  95. protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
  96. super.onMeasure(widthMeasureSpec, heightMeasureSpec);
  97. setMeasuredDimension(getMeasuredWidth(),getMeasuredHeight()+((MyNestedScrollParent)getParent()).getTopViewHeight());
  98. }
  99. }
  1. 布局文件
  1. <?xml version="1.0" encoding="utf-8"?>
  2. <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  3. xmlns:tools="http://schemas.android.com/tools"
  4. android:layout_width="match_parent"
  5. android:layout_height="match_parent"
  6. tools:context="com.lmj.com.mynestscroll.MainActivity">
  7.  
  8. <com.lmj.com.mynestscroll.view.MyNestedScrollParent
  9. android:layout_width="match_parent"
  10. android:layout_height="match_parent"
  11. android:background="#0f0"
  12. android:clickable="true"
  13. android:orientation="vertical">
  14.  
  15. <LinearLayout
  16. android:layout_width="match_parent"
  17. android:layout_height="wrap_content"
  18. android:orientation="vertical"
  19. >
  20.  
  21. <TextView
  22. android:id="@+id/tv_search"
  23. android:layout_width="match_parent"
  24. android:layout_height="100dp"
  25. android:gravity="center"
  26. android:padding="20dp"
  27. android:text="搜索" />
  28.  
  29. <LinearLayout
  30. android:id="@+id/ll_other"
  31. android:layout_width="match_parent"
  32. android:layout_height="wrap_content"
  33. android:layout_gravity="center"
  34. android:layout_marginLeft="20dp"
  35. android:layout_marginRight="20dp"
  36. android:orientation="vertical">
  37.  
  38. <TextView
  39. android:layout_width="match_parent"
  40. android:layout_height="wrap_content"
  41. android:background="#30ffffff"
  42. android:drawablePadding="10dp"
  43. android:gravity="center_vertical"
  44. android:padding="10dp"
  45. android:text="任何地方"
  46. android:textColor="#fff" />
  47.  
  48. <TextView
  49. android:layout_width="match_parent"
  50. android:layout_height="wrap_content"
  51. android:layout_marginTop="10dp"
  52. android:background="#30ffffff"
  53. android:drawablePadding="10dp"
  54. android:padding="10dp"
  55. android:text="任何时间"
  56. android:textColor="#fff" />
  57.  
  58. <TextView
  59. android:layout_width="match_parent"
  60. android:layout_height="wrap_content"
  61. android:layout_marginTop="10dp"
  62. android:background="#30ffffff"
  63. android:drawablePadding="10dp"
  64. android:padding="10dp"
  65. android:text="房客"
  66. android:textColor="#fff" />
  67.  
  68. </LinearLayout>
  69. </LinearLayout>
  70.  
  71. <TextView
  72. android:layout_width="match_parent"
  73. android:layout_height="wrap_content"
  74. android:background="#f0f"
  75. android:text="@string/topStr" />
  76.  
  77. <com.lmj.com.mynestscroll.view.MyNestedScrollChild
  78. android:layout_width="match_parent"
  79. android:layout_height="match_parent">
  80. <TextView
  81. android:layout_width="match_parent"
  82. android:layout_height="match_parent"
  83. android:text="1231231231312"
  84. />
  85.  
  86. </com.lmj.com.mynestscroll.view.MyNestedScrollChild>
  87.  
  88. <!--<com.lmj.com.mynestscroll.MyRecycleView-->
  89. <!--android:id="@+id/id_recyclerview"-->
  90. <!--android:layout_width="match_parent"-->
  91. <!--android:layout_height="match_parent">-->
  92.  
  93. <!--</com.lmj.com.mynestscroll.MyRecycleView>-->
  94.  
  95. </com.lmj.com.mynestscroll.view.MyNestedScrollParent>
  96.  
  97. </RelativeLayout>
  1. NestedScrollingChildNestedScrollingParent之间的部分,在滑动时会悬浮在顶部 RecycleView 本身已经实现了NestedScrollingChild
  2. 我们在使用RecycleView的时候 需要重写onMeasure方法
  1. public class MyRecycleView extends RecyclerView {
  2. public MyRecycleView(Context context) {
  3. super(context);
  4. }
  5.  
  6. public MyRecycleView(Context context, @Nullable AttributeSet attrs) {
  7. super(context, attrs);
  8. }
  9.  
  10. public MyRecycleView(Context context, @Nullable AttributeSet attrs, int defStyle) {
  11. super(context, attrs, defStyle);
  12. }
  13.  
  14. @Override
  15. protected void onMeasure(int widthSpec, int heightSpec) {
  16. super.onMeasure(widthSpec, heightSpec);
  17. setMeasuredDimension(getMeasuredWidth(),getMeasuredHeight()+((MyNestedScrollParent)getParent()).getTopViewHeight());
  18. }
  19. }

重新设定RecycleView的高度

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