這里直接代碼：

package com.example.libingyuan.horizontallistview.ScrollViewGroup;

import android.content.Context;

import android.util.AttributeSet;

import android.view.MotionEvent;

import android.view.View;

import android.view.ViewGroup;

import android.widget.Scroller;

/**

* 自定義ViewGroup

* 在橫向布局的基礎(chǔ)上，增加啦滾動效果，但是沒有邊界限制

*/

public class ScrollViewGroup extends ViewGroup {

private Scroller mScroller;

private float mLastMotionX = 0;

public ScrollViewGroup(Context context) {

this(context, null);

}

public ScrollViewGroup(Context context, AttributeSet attrs) {

this(context, attrs, 0);

}

public ScrollViewGroup(Context context, AttributeSet attrs, int defStyleAttr) {

super(context, attrs, defStyleAttr);

init(context);

}

private void init(Context context) {

mScroller = new Scroller(context);

}

@Override

public void computeScroll() {

if (mScroller.computeScrollOffset()) {

scrollTo(mScroller.getCurrX(), mScroller.getCurrY());

postInvalidate();

}

}

@Override

public boolean onTouchEvent(MotionEvent event) {

// TODO Auto-generated method stub

int action = event.getAction();

float x = event.getX();

switch (action) {

case MotionEvent.ACTION_DOWN:

if (!mScroller.isFinished()) {

mScroller.abortAnimation();

}

mLastMotionX = event.getX();

break;

case MotionEvent.ACTION_MOVE:

float delt = mLastMotionX - x;

mLastMotionX = x;

scrollBy((int) delt, 0);

break;

case MotionEvent.ACTION_UP:

invalidate();

break;

default:

break;

}

return true;

}

@Override

protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

//重新設(shè)置寬高

this.setMeasuredDimension(measureWidth(widthMeasureSpec, heightMeasureSpec), measureHeight(widthMeasureSpec, heightMeasureSpec));

}

/**

* 測量寬度

*/

private int measureWidth(int widthMeasureSpec, int heightMeasureSpec) {

// 寬度

int sizeWidth = MeasureSpec.getSize(widthMeasureSpec);

int modeWidth = MeasureSpec.getMode(widthMeasureSpec);

//父控件的寬(wrap_content)

int width = 0;

int childCount = getChildCount();

//重新測量子view的寬度，以及最大高度

for (int i = 0; i < childCount; i++) {

View child = getChildAt(i);

measureChild(child, widthMeasureSpec, heightMeasureSpec);

MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams();

int childWidth = child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin;

width += childWidth;

}

return modeWidth == MeasureSpec.EXACTLY ? sizeWidth : width;

}

/**

* 測量高度

*/

private int measureHeight(int widthMeasureSpec, int heightMeasureSpec) {

//高度

int sizeHeight = MeasureSpec.getSize(heightMeasureSpec);

int modeHeight = MeasureSpec.getMode(heightMeasureSpec);

//父控件的高(wrap_content)

int height = 0;

int childCount = getChildCount();

//重新測量子view的寬度，以及最大高度

for (int i = 0; i < childCount; i++) {

View child = getChildAt(i);

measureChild(child, widthMeasureSpec, heightMeasureSpec);

MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams();

int childHeight = child.getMeasuredHeight() + lp.topMargin + lp.bottomMargin;

height += childHeight;

}

height = height / childCount;

return modeHeight == MeasureSpec.EXACTLY ? sizeHeight : height;

}

@Override

protected void onLayout(boolean changed, int l, int t, int r, int b) {

int childLeft = 0;

int childWidth;

int height = getHeight();

int childCount = getChildCount();

for (int i = 0; i < childCount; i++) {

View child = getChildAt(i);

MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams();

childWidth = child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin;

child.layout(childLeft, 0, childLeft + childWidth, height);

childLeft += childWidth;

}

}

@Override

public LayoutParams generateLayoutParams(AttributeSet attrs) {

return new MarginLayoutParams(getContext(), attrs);

}

}

以上就是本文的全部內(nèi)容，希望對大家的學習有所幫助，也希望大家多多支持腳本之家。

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