{"id":656,"date":"2023-04-08T15:45:49","date_gmt":"2023-04-08T07:45:49","guid":{"rendered":"https:\/\/iichen.cn\/?p=656"},"modified":"2025-01-23T10:54:11","modified_gmt":"2025-01-23T02:54:11","slug":"android-%e8%87%aa%e5%ae%9a%e4%b9%89view%e4%b9%8b%e6%bb%91%e5%8a%a8","status":"publish","type":"post","link":"https:\/\/iichen.cn\/?p=656","title":{"rendered":"Android-\u81ea\u5b9a\u4e49View\u4e4b\u6ed1\u52a8"},"content":{"rendered":"<h4>1. Scroller<\/h4>\n<pre><code class=\"language-java line-numbers\">public void fling(int startX, int startY, int velocityX, int velocityY,\n            int minX, int maxX, int minY, int maxY) {}\n\n\n\npublic void startScrollBy(int dx,int dy) {\n        mScroller.forceFinished(true);\n        int startX = getScrollX();\n        int startY = getScrollY();\n        \/\/ \u5f00\u542f\u6ed1\u52a8\n        mScroller.startScroll(startX,startY,startX+dx,startY+dy,1000);\n        \/\/ \u6700\u7ec8\u7684onDraw\u4f1a\u8c03\u7528computeScroll\n        invalidate();\n    }\n\n@Override\npublic void computeScroll() {\n    super.computeScroll();\n    \/\/ \u4e0d\u65ad\u5224\u65ad\u662f\u5426\u5230\u9884\u5b9a\u4f4d\u7f6e\uff0c\u5e76\u901a\u8fc7scrollToscrollBy\u8fdb\u884c\u6ed1\u52a8\n    if (mScroller.computeScrollOffset()) {\n        scrollTo(mScroller.getCurrX(),mScroller.getCurrY());\n        if (mScroller.getCurrX() == getScrollX()\n                &amp;&amp; mScroller.getCurrY() == getScrollY() ) {\n            postInvalidate();\n        }\n    }\n}\n<\/code><\/pre>\n<h4>2. ViewDragHelper<\/h4>\n<p><a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/blog.csdn.net\/briblue\/article\/details\/73730386\" title=\"\u53c2\u8003\">\u53c2\u8003<\/a><\/p>\n<pre><code class=\"language-java line-numbers\">mDragHelper = ViewDragHelper.create(this, new ViewDragHelper.Callback() {\n    \/\/ \u8fd4\u56detrue\u624d\u4f1a\u540e\u7eed\u7684\u76f8\u5173\u56de\u8c03\uff0c\u53ef\u4ee5\u6839\u636e\u9700\u8981\u5bf9\u67d0\u4e2achild\u6267\u884c\n    @Override\n    public boolean tryCaptureView(View child, int pointerId) {\n        return true;\n    }\n    @Override\n    public void onViewCaptured(View capturedChild, int activePointerId) {\n        super.onViewCaptured(capturedChild, activePointerId);\n        mDragOriLeft = capturedChild.getLeft();\n        mDragOriTop = capturedChild.getTop();\n    }\n\n    \/\/ left \u6700\u7ec8\u7684\u5750\u6807 dx \u672c\u573a\u504f\u79fb\uff0c\u53ef\u4ee5\u5bf9left\u8fdb\u884c\u4fee\u6b63\u5982\uff1a\u8fb9\u7f18\u68c0\u6d4b \u8fd4\u56de\u4fee\u6b63\u540e\u7684left\n    @Override\n    public int clampViewPositionHorizontal(View child, int left, int dx) {\n        return left;\n    }\n\n    \/\/ \u540c\u4e0a\n    @Override\n    public int clampViewPositionVertical(View child, int top, int dy) {\n        return top;\n    }\n\n    \/\/ \u7ed3\u675f\u62d6\u62fd\u7684\u56de\u8c03\n    @Override\n    public void onViewReleased(View releasedChild, float xvel, float yvel) {\n        super.onViewReleased(releasedChild, xvel, yvel);\n\n        \/\/ \u8bbe\u7f6e\u4f4d\u7f6e \u9700\u8981\u914d\u5408Scroller  \u6216\u8005 \u4e0d\u7528\u8be5\u65b9\u5f0f \u76f4\u63a5\u4f7f\u7528\uff1a\n        \/\/ mDragHelper.smoothSlideViewTo(child, getLeft(),getTop());\n        mDragHelper.settleCapturedViewAt((int)mDragOriLeft,(int)mDragOriLeft);\n        invalidate();\n    }\n\n    \/\/ \u5bf9\u4e8e\u672c\u8eabclickable\u7ec4\u4ef6\u9700\u8981\u8bbe\u7f6e &gt; 0\u624d\u53ef\u4ee5\u6ed1\u52a8\n    @Override\n    public int getViewHorizontalDragRange(View child) {\n        return 1;\n    }\n\n    @Override\n    public int getViewVerticalDragRange(View child) {\n        return 1;\n    }\n\n    \/\/ \n    @Override\n    public void onEdgeDragStarted(int edgeFlags, int pointerId) {\n        super.onEdgeDragStarted(edgeFlags, pointerId);\n        \/\/ \u6b64\u5904\u53ef\u4ee5\u6307\u5b9aView\uff0c\u7528\u4e8e\u8868\u73b0\u8fb9\u7f18\u662f\u76f8\u5bf9\u4e8e\u7236\u5bb9\u5668\u8fb9\u754c \u800c\u975e\u5b50View\uff0c\u65e0\u5b9e\u9645\u610f\u4e49\n        mDragHelper.captureChildView(getChildAt(getChildCount()-1),pointerId);\n    }\n});\n\n\/\/ \u8fb9\u7f18\u662f\u76f8\u5bf9\u4e8e\u7236\u5bb9\u5668\u8fb9\u754c \u800c\u975e\u5b50View\nmDragHelper.setEdgeTrackingEnabled(ViewDragHelper.EDGE_ALL);\n\n@Override\npublic void computeScroll() {\n    super.computeScroll();\n    if (mDragHelper != null &amp;&amp; mDragHelper.continueSettling(true)) {\n        invalidate();\n    }\n}\n\n@Override\npublic boolean onInterceptTouchEvent(MotionEvent ev) {\n    return mDragHelper.shouldInterceptTouchEvent(ev);\n}\n\n@Override\npublic boolean onTouchEvent(MotionEvent event) {\n    mDragHelper.processTouchEvent(event);\n    return true;\n}\n<\/code><\/pre>\n<h4>3. ViewConfiguration<\/h4>\n<ul>\n<li>getScaledTouchSlop()\uff1a\u83b7\u53d6\u89e6\u6478\u7684\u6700\u5c0f\u79fb\u52a8\u8ddd\u79bb\uff0c\u7528\u4e8e\u5224\u65ad\u7528\u6237\u662f\u5426\u6b63\u5728\u8fdb\u884c\u6ed1\u52a8\u64cd\u4f5c\u3002<\/li>\n<li>getDoubleTapTimeout()\uff1a\u83b7\u53d6\u53cc\u51fb\u64cd\u4f5c\u7684\u8d85\u65f6\u65f6\u95f4\u3002<\/li>\n<li>getLongPressTimeout()\uff1a\u83b7\u53d6\u957f\u6309\u64cd\u4f5c\u7684\u8d85\u65f6\u65f6\u95f4\u3002<\/li>\n<li>getTapTimeout()\uff1a\u83b7\u53d6\u5355\u51fb\u64cd\u4f5c\u7684\u8d85\u65f6\u65f6\u95f4\u3002<\/li>\n<li>getHoverTapTimeout()\uff1a\u83b7\u53d6\u60ac\u505c\u64cd\u4f5c\u7684\u8d85\u65f6\u65f6\u95f4\u3002<\/li>\n<li>getEdgeSlop()\uff1a\u83b7\u53d6\u89e6\u6478\u8fb9\u754c\u7684\u5bb9\u5dee\u8ddd\u79bb\uff0c\u7528\u4e8e\u5224\u65ad\u7528\u6237\u662f\u5426\u89e6\u6478\u4e86\u5c4f\u5e55\u7684\u8fb9\u7f18\u3002<\/li>\n<li>getFadingEdgeLength()\uff1a\u83b7\u53d6\u6e10\u9690\u8fb9\u7f18\u7684\u957f\u5ea6\u3002<\/li>\n<li>getMinimumFlingVelocity()\uff1a\u83b7\u53d6\u6700\u5c0f\u6ed1\u52a8\u901f\u5ea6\u3002<\/li>\n<li>getMaximumFlingVelocity()\uff1a\u83b7\u53d6\u6700\u5927\u6ed1\u52a8\u901f\u5ea6\u3002<\/li>\n<\/ul>\n<blockquote><p>\n  getWindowTouchSlop() \u65b9\u6cd5\u662f ViewConfiguration \u7c7b\u4e2d\u7684\u4e00\u4e2a\u65b9\u6cd5\uff0c\u5b83\u7528\u4e8e\u83b7\u53d6\u7a97\u53e3\u4e2d\u7684\u89e6\u6478\u5bb9\u5dee\u8ddd\u79bb\u3002\u8fd9\u4e2a\u5bb9\u5dee\u8ddd\u79bb\u662f\u6307\u5f53\u7528\u6237\u5728\u5c4f\u5e55\u4e0a\u89e6\u6478\u65f6\uff0c\u5141\u8bb8\u624b\u6307\u5728\u6309\u4e0b\u65f6\u7a0d\u5fae\u79fb\u52a8\u4e00\u5b9a\u8ddd\u79bb\uff0c\u800c\u4e0d\u88ab\u8ba4\u4e3a\u662f\u6ed1\u52a8\u64cd\u4f5c\u7684\u8ddd\u79bb\u9608\u503c\u3002<\/p>\n<p>  \u4e0e getScaledTouchSlop() \u65b9\u6cd5\u4e0d\u540c\u7684\u662f\uff0cgetWindowTouchSlop() \u65b9\u6cd5\u8fd4\u56de\u7684\u503c\u4e0d\u662f\u4e00\u4e2a\u7ecf\u8fc7\u7f29\u653e\u5904\u7406\u7684\u503c\uff0c\u800c\u662f\u539f\u59cb\u7684\u50cf\u7d20\u503c\u3002\u8fd9\u610f\u5473\u7740\u5b83\u53ef\u4ee5\u7528\u4e8e\u4e0e\u5c4f\u5e55\u50cf\u7d20\u5bc6\u5ea6\u65e0\u5173\u7684\u8ba1\u7b97\u3002<\/p>\n<p>  \u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u4f7f\u7528 getScaledTouchSlop() \u65b9\u6cd5\u6765\u83b7\u53d6\u89e6\u6478\u5bb9\u5dee\u8ddd\u79bb\uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u4f8b\u5982\u5728\u81ea\u5b9a\u4e49\u7ed8\u5236\u7684\u89c6\u56fe\u4e2d\uff0c\u5f00\u53d1\u8005\u53ef\u80fd\u9700\u8981\u4f7f\u7528 getWindowTouchSlop() \u65b9\u6cd5\u6765\u83b7\u53d6\u6b63\u786e\u7684\u503c\u3002\n<\/p><\/blockquote>\n<h4>4. \u5176\u4ed6\u79fb\u52a8\u65b9\u5f0f<\/h4>\n<pre><code class=\"language-java line-numbers\">ViewCompat.offsetLeftAndRight(mDragView,deltaX);\nViewCompat.offsetTopAndBottom(mDragView,deltaY);\n\nView.layout(left, top, right, bottom) \u65b9\u6cd5\n\nView \u7684 translationX \u548c translationY \u5c5e\u6027\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>1. 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