FATAL EXCEPTION: main java.lang.classCastException: androID.support.v4.vIEw.VIEwPager$LayoutParams at androID.Widget.linearLayout.measureVertical(linearLayout.java:360) at androID.Widget.linearLayout.onMeasure(linearLayout.java:309) at androID.vIEw.VIEw.measure(VIEw.java:8313) at androID.Widget.@R_403_4614@Layout.measureChild(@R_403_4614@Layout.java:566) at androID.Widget.@R_403_4614@Layout.onMeasure(@R_403_4614@Layout.java:381) at androID.vIEw.VIEw.measure(VIEw.java:8313) at androID.vIEw.VIEwGroup.measureChilDWithmargins(VIEwGroup.java:3138) at androID.Widget.FrameLayout.onMeasure(FrameLayout.java:250) at androID.vIEw.VIEw.measure(VIEw.java:8313) at androID.vIEw.VIEwGroup.measureChilDWithmargins(VIEwGroup.java:3138) at androID.Widget.FrameLayout.onMeasure(FrameLayout.java:250) at androID.vIEw.VIEw.measure(VIEw.java:8313) at androID.vIEw.VIEwGroup.measureChilDWithmargins(VIEwGroup.java:3138) at androID.Widget.FrameLayout.onMeasure(FrameLayout.java:250) at androID.vIEw.VIEw.measure(VIEw.java:8313) at androID.vIEw.VIEwGroup.measureChilDWithmargins(VIEwGroup.java:3138) at androID.Widget.FrameLayout.onMeasure(FrameLayout.java:250) at androID.vIEw.VIEw.measure(VIEw.java:8313) at androID.vIEw.VIEwGroup.measureChilDWithmargins(VIEwGroup.java:3138) at androID.Widget.FrameLayout.onMeasure(FrameLayout.java:250) at androID.vIEw.VIEw.measure(VIEw.java:8313) at androID.Widget.@R_403_4614@Layout.measureChildHorizontal(@R_403_4614@Layout.java:581) at androID.Widget.@R_403_4614@Layout.onMeasure(@R_403_4614@Layout.java:365) at androID.vIEw.VIEw.measure(VIEw.java:8313) at androID.vIEw.VIEwGroup.measureChilDWithmargins(VIEwGroup.java:3138) at androID.Widget.FrameLayout.onMeasure(FrameLayout.java:250) at androID.vIEw.VIEw.measure(VIEw.java:8313) at androID.vIEw.VIEwGroup.measureChilDWithmargins(VIEwGroup.java:3138) at androID.Widget.linearLayout.measureChildBeforeLayout(linearLayout.java:1017) at androID.Widget.linearLayout.measureVertical(linearLayout.java:386) at androID.Widget.linearLayout.onMeasure(linearLayout.java:309) at androID.vIEw.VIEw.measure(VIEw.java:8313) at androID.vIEw.VIEwGroup.measureChilDWithmargins(VIEwGroup.java:3138) at androID.Widget.FrameLayout.onMeasure(FrameLayout.java:250) at androID.vIEw.VIEw.measure(VIEw.java:8313) at androID.vIEw.VIEwGroup.measureChilDWithmargins(VIEwGroup.java:3138) at androID.Widget.FrameLayout.onMeasure(FrameLayout.java:250) at androID.vIEw.VIEw.measure(VIEw.java:8313) at androID.vIEw.VIEwRoot.performTraversals(VIEwRoot.java:845) at androID.vIEw.VIEwRoot.handleMessage(VIEwRoot.java:1865) at androID.os.Handler.dispatchMessage(Handler.java:99) at androID.os.Looper.loop(Looper.java:130) at androID.app.ActivityThread.main(ActivityThread.java:3687) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:507) at com.androID.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)at com.androID.internal.os.ZygoteInit.main(ZygoteInit.java:625) at dalvik.system.NativeStart.main(Native Method)
这是它被实现的代码段.
PulL_TO_REFRESH = (PullToRefreshGrIDVIEw)findVIEwByID(R.ID.groupList);mGroupList = PulL_TO_REFRESH.getAdapterVIEw();Vector<VIEw> pages = new Vector<VIEw>(); pages.add(mGroupList); VIEwPager vp = (VIEwPager)findVIEwByID(R.ID.myfivepanelpager); CustomPagerAdapter adapter = new CustomPagerAdapter(this,pages); vp.setAdapter(adapter); // Set a Listener to be invoked when the List should be refreshed. PulL_TO_REFRESH.setonRefreshListener(new OnRefreshListener() { @OverrIDe public voID onRefresh() { // Todo auto-generated method stub } }); 这是来自PullToRefresh库的代码片段,可能是原因.
package com.syncusup.pulltorefresh.library.my;import androID.content.Context;import androID.os.Handler;import androID.util.AttributeSet;import androID.vIEw.LayoutInflater;import androID.vIEw.MotionEvent;import androID.vIEw.VIEw;import androID.vIEw.VIEw.OntouchListener;import androID.vIEw.VIEwGroup;import androID.vIEw.animation.AccelerateDecelerateInterpolator;import androID.vIEw.animation.Animation;import androID.vIEw.animation.Interpolator;import androID.vIEw.animation.linearInterpolator;import androID.vIEw.animation.RotateAnimation;import androID.Widget.AdapterVIEw;import androID.Widget.ImageVIEw;import androID.Widget.linearLayout;import androID.Widget.listadapter;import androID.Widget.Progressbar;import androID.Widget.TextVIEw;import com.syncusup.R;public abstract class PullToRefreshBase<T extends AdapterVIEw<listadapter>> extends linearLayout implements OntouchListener { private final class SmoothScrollRunnable implements Runnable { static final int ANIMATION_DURATION_MS = 190; static final int ANIMATION_FPS = 1000 / 60; private final Interpolator interpolator; private final int scrollToY; private final int scrollFromY; private final Handler handler; private boolean continueRunning = true; private long startTime = -1; private int currentY = -1; public SmoothScrollRunnable(Handler handler,int fromY,int toY) { this.handler = handler; this.scrollFromY = fromY; this.scrollToY = toY; this.interpolator = new AccelerateDecelerateInterpolator(); } @OverrIDe public voID run() { /** * Only set startTime if this is the first time we're starting,else * actually calculate the Y delta */ if (startTime == -1) { startTime = System.currentTimeMillis(); } else { /** * We do do all calculations in long to reduce software float * calculations. We use 1000 as it gives us good accuracy and * small rounding errors */ long normalizedTime = (1000 * (System.currentTimeMillis() - startTime)) / ANIMATION_DURATION_MS; normalizedTime = Math.max(Math.min(normalizedTime,1000),0); final int deltaY = Math.round((scrollFromY - scrollToY) * interpolator.getInterpolation(normalizedTime / 1000f)); this.currentY = scrollFromY - deltaY; setheaderScroll(currentY); } // If we're not at the target Y,keep going... if (continueRunning && scrollToY != currentY) { handler.postDelayed(this,ANIMATION_FPS); } } public voID stop() { this.continueRunning = false; this.handler.removeCallbacks(this); } }; // =========================================================== // Constants // =========================================================== static final int PulL_TO_REFRESH = 0; static final int RELEASE_TO_REFRESH = PulL_TO_REFRESH + 1; static final int REFRESHING = RELEASE_TO_REFRESH + 1; static final int EVENT_COUNT = 3; // =========================================================== // FIElds // =========================================================== private int state = PulL_TO_REFRESH; private T adapterVIEw; private boolean isPullToRefreshEnabled = true; private Progressbar headerProgress; private TextVIEw headerText; private ImageVIEw headerImage; private Animation flipAnimation,reverseAnimation; private int headerHeight; private final Handler handler = new Handler(); private OntouchListener ontouchListener; private OnRefreshListener onRefreshListener; private SmoothScrollRunnable currentSmoothScrollRunnable; private float startY = -1; private final float[] lastYs = new float[EVENT_COUNT]; private String releaseLabel; private String pullLabel; private String refreshingLabel; // =========================================================== // Constructors // =========================================================== public PullToRefreshBase(Context context) { this(context,null); } public PullToRefreshBase(Context context,AttributeSet attrs) { super(context,attrs); init(context,attrs); } // =========================================================== // Getter & Setter // =========================================================== /** * Get the Wrapped AdapterVIEw. Anything returned here has already been * added to the content vIEw. * * @return The AdapterVIEw which is currently wrapped */ public final T getAdapterVIEw() { return adapterVIEw; } /** * Whether Pull-to-Refresh is enabled * * @return enabled */ public boolean isPullToRefreshEnabled() { return isPullToRefreshEnabled; } /** * Mark the current Refresh as complete. Will reset the UI and hIDe the * Refreshing VIEw */ public voID onRefreshComplete() { resetheader(); } public voID setonRefreshListener(OnRefreshListener Listener) { onRefreshListener = Listener; } /** * A mutator to enable/disable Pull-to-Refresh for the current AdapterVIEw * * @param enable * Whether Pull-To-Refresh should be used */ public voID setPullToRefreshEnabled(boolean enabled) { this.isPullToRefreshEnabled = enabled; } public voID setReleaseLabel(String releaseLabel) { this.releaseLabel = releaseLabel; } public voID setPullLabel(String pullLabel) { this.pullLabel = pullLabel; } public voID setRefreshingLabel(String refreshingLabel) { this.refreshingLabel = refreshingLabel; } public voID setheaderProgress(Progressbar headerProgress) { this.headerProgress = headerProgress; } // =========================================================== // Methods for/from SuperClass/Interfaces // =========================================================== @OverrIDe public voID setontouchListener(OntouchListener Listener) { ontouchListener = Listener; } @OverrIDe public boolean ontouch(VIEw vIEw,MotionEvent ev) { if (isPullToRefreshEnabled) { // Returning true here stops the ListVIEw being scrollable while we // refresh if (state == REFRESHING) { return true; } else { return onAdapterVIEwtouch(vIEw,ev); } } return false; } /** * This is implemented by derived classes to return the created AdapterVIEw. * If you need to use a custom AdapterVIEw (such as a custom ListVIEw),* overrIDe this method and return an instance of your custom class. * * Be sure to set the ID of the vIEw in this method,especially if you're * using a ListActivity or ListFragment. * * @param context * @param attrs * AttributeSet from wrapped class. Means that anything you * include in the XML layout declaration will be routed to the * AdapterVIEw * @return New instance of the AdapterVIEw */ protected abstract T createAdapterVIEw(Context context,AttributeSet attrs); // =========================================================== // Methods // =========================================================== protected final voID resetheader() { state = PulL_TO_REFRESH; initializeYsHistory(); startY = -1; headerImage.setVisibility(VIEw.VISIBLE); headerProgress.setVisibility(VIEw.GONE); smoothScrollTo(0); } private voID init(Context context,AttributeSet attrs) { setorIEntation(linearLayout.VERTICAL); // header VIEwGroup header = (VIEwGroup) LayoutInflater.from(context).inflate(R.layout.pull_to_refresh_header,this,false); headerText = (TextVIEw) header.findVIEwByID(R.ID.pull_to_refresh_text); pullLabel = context.getString(R.string.pull_to_refresh_pull_label); refreshingLabel = context.getString(R.string.pull_to_refresh_refreshing_label); releaseLabel = context.getString(R.string.pull_to_refresh_release_label); headerImage = (ImageVIEw) header.findVIEwByID(R.ID.pull_to_refresh_image); headerProgress = (Progressbar) header.findVIEwByID(R.ID.pull_to_refresh_progress); addVIEw(header,VIEwGroup.LayoutParams.FILL_PARENT,VIEwGroup.LayoutParams.WRAP_CONTENT); measureVIEw(header); headerHeight = header.getMeasuredHeight(); // AdapterVIEw // By passing the attrs,we can add ListVIEw/GrIDVIEw params via XML adapterVIEw = this.createAdapterVIEw(context,attrs); adapterVIEw.setontouchListener(this); addVIEw(adapterVIEw,VIEwGroup.LayoutParams.FILL_PARENT); // Animations flipAnimation = new RotateAnimation(0,-180,Animation.@R_403_4614@_TO_SELF,0.5f,0.5f); flipAnimation.setInterpolator(new linearInterpolator()); flipAnimation.setDuration(250); flipAnimation.setFillAfter(true); reverseAnimation = new RotateAnimation(-180,0.5f); reverseAnimation.setInterpolator(new linearInterpolator()); reverseAnimation.setDuration(250); reverseAnimation.setFillAfter(true); // HIDe header VIEw setpadding(getpaddingleft(),-headerHeight,getpaddingRight(),getpaddingBottom()); } private voID measureVIEw(VIEw child) { VIEwGroup.LayoutParams p = child.getLayoutParams(); if (p == null) { p = new VIEwGroup.LayoutParams(VIEwGroup.LayoutParams.FILL_PARENT,VIEwGroup.LayoutParams.WRAP_CONTENT); } int chilDWIDthSpec = VIEwGroup.getChildMeasureSpec(0,0 + 0,p.wIDth); int lpHeight = p.height; int childHeightSpec; if (lpHeight > 0) { childHeightSpec = MeasureSpec.makeMeasureSpec(lpHeight,MeasureSpec.EXACTLY); } else { childHeightSpec = MeasureSpec.makeMeasureSpec(0,MeasureSpec.UnspecIFIED); } child.measure(chilDWIDthSpec,childHeightSpec); } private boolean onAdapterVIEwtouch(VIEw vIEw,MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_MOVE: updateEventStates(event); if (isPullingDownToRefresh() && startY == -1) { if (startY == -1) { startY = event.getY(); } return false; } if (startY != -1 && !adapterVIEw.ispressed()) { pullDown(event,startY); return true; } break; case MotionEvent.ACTION_UP: initializeYsHistory(); startY = -1; if (state == RELEASE_TO_REFRESH) { setRefreshing(); if (onRefreshListener != null) { onRefreshListener.onRefresh(); } } else { smoothScrollTo(0); } break; } if (null != ontouchListener) { return ontouchListener.ontouch(vIEw,event); } return false; } private voID pullDown(MotionEvent event,float firstY) { float averageY = average(lastYs); int height = (int) (Math.max(averageY - firstY,0)); setheaderScroll(height); if (state == PulL_TO_REFRESH && headerHeight < height) { state = RELEASE_TO_REFRESH; headerText.setText(releaseLabel); headerImage.clearanimation(); headerImage.startAnimation(flipAnimation); } if (state == RELEASE_TO_REFRESH && headerHeight >= height) { state = PulL_TO_REFRESH; headerText.setText(pullLabel); headerImage.clearanimation(); headerImage.startAnimation(reverseAnimation); } } private voID setheaderScroll(int y) { scrollTo(0,-y); } private int getheaderScroll() { return -getScrollY(); } private voID setRefreshing() { state = REFRESHING; headerText.setText(refreshingLabel); headerImage.clearanimation(); headerImage.setVisibility(VIEw.INVISIBLE); headerProgress.setVisibility(VIEw.VISIBLE); smoothScrollTo(headerHeight); } private float average(float[] ysArray) { float avg = 0; for (int i = 0; i < EVENT_COUNT; i++) { avg += ysArray[i]; } return avg / EVENT_COUNT; } private voID initializeYsHistory() { for (int i = 0; i < EVENT_COUNT; i++) { lastYs[i] = 0; } } private voID updateEventStates(MotionEvent event) { for (int i = 0; i < EVENT_COUNT - 1; i++) { lastYs[i] = lastYs[i + 1]; } float y = event.getY(); int top = adapterVIEw.gettop(); lastYs[EVENT_COUNT - 1] = y + top; } private boolean isPullingDownToRefresh() { return isPullToRefreshEnabled && state != REFRESHING && isUserDraggingDownwards() && isFirstVisible(); } private boolean isFirstVisible() { if (this.adapterVIEw.getCount() == 0) { return true; } else if (adapterVIEw.getFirstVisibleposition() == 0) { return adapterVIEw.getChildAt(0).gettop() >= adapterVIEw.gettop(); } else { return false; } } private boolean isUserDraggingDownwards() { return this.isUserDraggingDownwards(0,EVENT_COUNT - 1); } private boolean isUserDraggingDownwards(int from,int to) { return lastYs[from] != 0 && lastYs[to] != 0 && Math.abs(lastYs[from] - lastYs[to]) > 10 && lastYs[from] < lastYs[to]; } private voID smoothScrollTo(int y) { if (null != currentSmoothScrollRunnable) { currentSmoothScrollRunnable.stop(); } this.currentSmoothScrollRunnable = new SmoothScrollRunnable(handler,getheaderScroll(),y); handler.post(currentSmoothScrollRunnable); } // =========================================================== // Inner and Anonymous Classes // =========================================================== public static interface OnRefreshListener { public voID onRefresh(); }}解决方法 为了获得更好的答案,我必须看到您的CustomPagerAdapter的实现. 但是,由于CustomPagerAdapter的构造函数将一个数组/集合/向量的视图作为参数,假设CustomPagerAdapter的instantiateItem方法(或者如果您的CustomPagerAdapter是FragmentPagerAdapter的getItem方法)使用这些视图构建VIEwPager的页面是否正确？
如果是这样,那可能是你的问题.
矢量<视图>页面变量包含已经是布局的一部分的视图.在这种情况下,(唯一)VIEw中有mGroupList. mGroupList已经是布局的一部分.你不能做一个视图(在这种情况下是mGroupList)是两个不同父母的孩子.
而不是“找到”mGroupList,而是在CustomPagerAdapter的instantiateItem方法中创建一个全新的PullToRefreshGrIDVIEw(通过代码或通过扩充相应的layout-xml).全新的PullToRefreshGrIDVIEw实例将不再具有父权限,但是当VIEwPager认为有必要时,它将成为VIEwPager的子代.
为了使事情变得更简单,我建议使用FragmentPagerAdapter或FragmentStatePagerAdapter,它将在其getItem方法中返回一个适当的Fragment.然后,Fragment将在其onCreateVIEw方法中返回正确的视图,其中包含您想要的PullToRefreshGrIDVIEw.
https://developer.android.com/reference/android/support/v13/app/FragmentPagerAdapter.html
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