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测试平台:
RK3288 Android8.1RK3588 Android 12
问题 首先, 这个问题的前提是, 使用的输入设备是**鼠标**, 普通的触摸屏并不会出现这个问题. 大致的流程是APP的UI布局中采用ScrollView作为根容器, 之后添加各类子控件, 在一起准备就绪后, 使用鼠标进行功能测试, 出现…
平台
测试平台:
RK3288 Android8.1RK3588 Android 12
问题 首先, 这个问题的前提是, 使用的输入设备是**鼠标**, 普通的触摸屏并不会出现这个问题. 大致的流程是APP的UI布局中采用ScrollView作为根容器, 之后添加各类子控件, 在一起准备就绪后, 使用鼠标进行功能测试, 出现无法点击控件触发事件响应.ScrollViewxmlns:androidhttp://schemas.android.com/apk/res/androidandroid:layout_widthmatch_parentandroid:layout_heightmatch_parentLinearLayoutandroid:layout_widthmatch_parentandroid:layout_heightmatch_parentandroid:orientationverticalLinearLayoutstylestyle/settingsItemsTextView stylestyle/TVandroid:textXXXandroid:layout_weight1/Buttonandroid:layout_widthwrap_contentandroid:layout_heightwrap_contentandroid:textBTN//LinearLayoutLinearLayoutstylestyle/settingsItemsTextView stylestyle/TVandroid:textXXXandroid:layout_weight1/Buttonandroid:layout_widthwrap_contentandroid:layout_heightwrap_contentandroid:textBTN//LinearLayout!--可以写多几个--/LinearLayout
/ScrollView分析
最先从onInterceptTouchEvent函数入手, 各个层级的LOG大致分析, 由下往上发现控件BUTTON中根本没有捕获到MotionEvent, 那原因只可能是父控件自己捕获了而不下发. 兜兜转转最终来到了ScrollView.
通过重写onInterceptHoverEvent 判断是否时间已被捕获 Overridepublic boolean onInterceptHoverEvent(MotionEvent event) {boolean b super.onInterceptHoverEvent(event);Logger.d(TAG, onInterceptHoverEvent b);return b;}从输出的LOG可以看出来, 当使用鼠标的时候, TRUE 和 FALSE 均有可能出现(在后面排查是才发现这和控件处的位置有关), 当TRUE是, 说明事件由ScrollView处理了, 子控件自然就接收不到事件下发.
顺着onInterceptHoverEvent往上查: frameworks/base/core/java/android/view/ViewGroup.java public boolean onInterceptHoverEvent(MotionEvent event) {if (event.isFromSource(InputDevice.SOURCE_MOUSE)) {final int action event.getAction();final float x event.getX();final float y event.getY();if ((action MotionEvent.ACTION_HOVER_MOVE|| action MotionEvent.ACTION_HOVER_ENTER) isOnScrollbar(x, y)) {return true;}}return false;}从代码中可以看出, 基本的判断条件都是成立的, 鼠标输入 MOVE/ENTER时间, 最后一个是isOnScrollbar, 顾名思义输入鼠标的位置在ScrollBar 上? frameworks/base/core/java/android/view/View.java boolean isOnScrollbar(float x, float y) {if (mScrollCache null) {return false;}x getScrollX();y getScrollY();if (isVerticalScrollBarEnabled() !isVerticalScrollBarHidden()) {final Rect touchBounds mScrollCache.mScrollBarTouchBounds;getVerticalScrollBarBounds(null, touchBounds);if (touchBounds.contains((int) x, (int) y)) {return true;}}if (isHorizontalScrollBarEnabled()) {final Rect touchBounds mScrollCache.mScrollBarTouchBounds;getHorizontalScrollBarBounds(null, touchBounds);if (touchBounds.contains((int) x, (int) y)) {return true;}}return false;}private void getVerticalScrollBarBounds(Nullable Rect bounds, Nullable Rect touchBounds) {if (mRoundScrollbarRenderer null) {getStraightVerticalScrollBarBounds(bounds, touchBounds);} else {getRoundVerticalScrollBarBounds(bounds ! null ? bounds : touchBounds);}}private void getStraightVerticalScrollBarBounds(Nullable Rect drawBounds,Nullable Rect touchBounds) {final Rect bounds drawBounds ! null ? drawBounds : touchBounds;if (bounds null) {return;}final int inside (mViewFlags SCROLLBARS_OUTSIDE_MASK) 0 ? ~0 : 0;final int size getVerticalScrollbarWidth();int verticalScrollbarPosition mVerticalScrollbarPosition;if (verticalScrollbarPosition SCROLLBAR_POSITION_DEFAULT) {verticalScrollbarPosition isLayoutRtl() ?SCROLLBAR_POSITION_LEFT : SCROLLBAR_POSITION_RIGHT;}final int width mRight - mLeft;final int height mBottom - mTop;switch (verticalScrollbarPosition) {default:case SCROLLBAR_POSITION_RIGHT:bounds.left mScrollX width - size - (mUserPaddingRight inside);break;case SCROLLBAR_POSITION_LEFT:bounds.left mScrollX (mUserPaddingLeft inside);break;}bounds.top mScrollY (mPaddingTop inside);bounds.right bounds.left size;bounds.bottom mScrollY height - (mUserPaddingBottom inside);if (touchBounds null) {return;}if (touchBounds ! bounds) {touchBounds.set(bounds);}final int minTouchTarget mScrollCache.scrollBarMinTouchTarget;if (touchBounds.width() minTouchTarget) {final int adjust (minTouchTarget - touchBounds.width()) / 2;if (verticalScrollbarPosition SCROLLBAR_POSITION_RIGHT) {touchBounds.right Math.min(touchBounds.right adjust, mScrollX width);touchBounds.left touchBounds.right - minTouchTarget;} else {touchBounds.left Math.max(touchBounds.left adjust, mScrollX);touchBounds.right touchBounds.left minTouchTarget;}}if (touchBounds.height() minTouchTarget) {final int adjust (minTouchTarget - touchBounds.height()) / 2;touchBounds.top - adjust;touchBounds.bottom touchBounds.top minTouchTarget;}}/*** pScrollabilityCache holds various fields used by a View when scrolling* is supported. This avoids keeping too many unused fields in most* instances of View./p*/private static class ScrollabilityCache implements Runnable {/*** Scrollbars are not visible*/public static final int OFF 0;/*** Scrollbars are visible*/public static final int ON 1;/*** Scrollbars are fading away*/public static final int FADING 2;public boolean fadeScrollBars;public int fadingEdgeLength;public int scrollBarDefaultDelayBeforeFade;public int scrollBarFadeDuration;public int scrollBarSize;public int scrollBarMinTouchTarget;public ScrollBarDrawable scrollBar;public float[] interpolatorValues;public View host;public final Paint paint;public final Matrix matrix;public Shader shader;public final Interpolator scrollBarInterpolator new Interpolator(1, 2);private static final float[] OPAQUE { 255 };private static final float[] TRANSPARENT { 0.0f };/*** When fading should start. This time moves into the future every time* a new scroll happens. Measured based on SystemClock.uptimeMillis()*/public long fadeStartTime;/*** The current state of the scrollbars: ON, OFF, or FADING*/public int state OFF;private int mLastColor;public final Rect mScrollBarBounds new Rect();public final Rect mScrollBarTouchBounds new Rect();public static final int NOT_DRAGGING 0;public static final int DRAGGING_VERTICAL_SCROLL_BAR 1;public static final int DRAGGING_HORIZONTAL_SCROLL_BAR 2;public int mScrollBarDraggingState NOT_DRAGGING;public float mScrollBarDraggingPos 0;public ScrollabilityCache(ViewConfiguration configuration, View host) {fadingEdgeLength configuration.getScaledFadingEdgeLength();scrollBarSize configuration.getScaledScrollBarSize();scrollBarMinTouchTarget configuration.getScaledMinScrollbarTouchTarget();scrollBarDefaultDelayBeforeFade ViewConfiguration.getScrollDefaultDelay();scrollBarFadeDuration ViewConfiguration.getScrollBarFadeDuration();paint new Paint();matrix new Matrix();// use use a height of 1, and then wack the matrix each time we// actually use it.shader new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP);paint.setShader(shader);paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));this.host host;}public void setFadeColor(int color) {if (color ! mLastColor) {mLastColor color;if (color ! 0) {shader new LinearGradient(0, 0, 0, 1, color | 0xFF000000,color 0x00FFFFFF, Shader.TileMode.CLAMP);paint.setShader(shader);// Restore the default transfer mode (src_over)paint.setXfermode(null);} else {shader new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP);paint.setShader(shader);paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));}}}public void run() {long now AnimationUtils.currentAnimationTimeMillis();if (now fadeStartTime) {// the animation fades the scrollbars out by changing// the opacity (alpha) from fully opaque to fully// transparentint nextFrame (int) now;int framesCount 0;Interpolator interpolator scrollBarInterpolator;// Start opaqueinterpolator.setKeyFrame(framesCount, nextFrame, OPAQUE);// End transparentnextFrame scrollBarFadeDuration;interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT);state FADING;// Kick off the fade animationhost.invalidate(true);}}}
View中的代码有点多, 简单的来说, 就是isOnScrollbar 这个函数通过获取ScrollBar的位置大小信息判断输入的事件是否处于其捕获的范围.
通过反射调用getVerticalScrollBarBounds并输出读取的信息: touchRect[1464,0][1512,674], 基本可以判定是滚动条的位置. Rect touchRect new Rect();
getVerticalScrollBarBoundsRe(null, touchRect);
Logger.d(TAG, touchRect touchRect.toShortString());void getVerticalScrollBarBoundsRe(Rect r, Rect r2){try {SuppressLint(SoonBlockedPrivateApi)Method getVerticalScrollBarBounds View.class.getDeclaredMethod(getVerticalScrollBarBounds, Rect.class, Rect.class);getVerticalScrollBarBounds.setAccessible(true);getVerticalScrollBarBounds.invoke(this, r, r2);} catch (NoSuchMethodException e) {e.printStackTrace();} catch (InvocationTargetException e) {e.printStackTrace();} catch (IllegalAccessException e) {e.printStackTrace();}}计算宽度1512 - 1464 48, 这个宽度默认在系统中又定义, 如果是自定义的ScrollBar则大小不一定是48, 根据configuration.getScaledMinScrollbarTouchTarget();查到源码的定义如下: frameworks/base/core/java/android/view/ViewConfiguration.java private static final int MIN_SCROLLBAR_TOUCH_TARGET 48;/*** return the minimum size of the scrollbar thumbs touch target in pixels* hide*/
public int getScaledMinScrollbarTouchTarget() {return mMinScrollbarTouchTarget;
}问题的根源如下图所示, 红色滚动条的宽度为48: PS: 上图中的滚动条默认情况下并没有显示出来.
解决方法
修改XML中ScrollView的属性android:scrollbarsnone”避免需要输入的控件显示在ScrollBar的下方, 考虑给子控件加个padding或margin自定义ScrollView, 优化onInterceptHoverEvent函数
