在自定义viewgroup（5）：//www.jb51.net/article/100639.htm的基础上，添加使用adapter来适配数据，这样更加的方便，这里只是使用adapter适配数据，不能更新。
package com.example.libingyuan.horizontallistview.ScrollViewGroup;
import android.content.Context;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.Scroller;
public class ScrollViewGroup extends ViewGroup {
//滚动计算辅助类
private Scroller mScroller;
//屏幕宽度
private int screenWidth;
//可以移动的最大距离
private int mMaxDistance;
//自定义手势监听类
private ScrollTouchLisener mTouchLisener;
//手势监听
private GestureDetector mDetector;
private BaseAdapter mAdapter;
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) {
//初始化辅助类
mScroller = new Scroller(context);
//获取屏幕宽度
WindowManager manager = (WindowManager) context
.getSystemService(Context.WINDOW_SERVICE);
DisplayMetrics outMetrics = new DisplayMetrics();
manager.getDefaultDisplay().getMetrics(outMetrics);
screenWidth = outMetrics.widthPixels;
//手势指示器初始化
mTouchLisener = new ScrollTouchLisener();
mDetector = new GestureDetector(context, mTouchLisener);
}
@Override
public void computeScroll() {
//判断滚动时候停止
if (mScroller.computeScrollOffset()) {
//滚动到指定的位置
scrollTo(mScroller.getCurrX(), mScroller.getCurrY());
//这句话必须写，否则不能实时刷新
invalidate();
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
mDetector.onTouchEvent(event);
if (event.getAction() == MotionEvent.ACTION_UP) {
this.onUp(event);
}
return true;
}
public void setAdapter(BaseAdapter adapter) {
this.mAdapter = adapter;
requestLayout();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
removeAllViews();
for (int i = 0; i < mAdapter.getCount(); i++) {
View child = mAdapter.getView(i, null, null);
addView(child);
}
//重新设置宽高
this.setMeasuredDimension(measureWidth(widthMeasureSpec, heightMeasureSpec), measureHeight(widthMeasureSpec, heightMeasureSpec));
}
private int measureWidth(int widthMeasureSpec, int heightMeasureSpec) {
// 宽度
int sizeWidth = MeasureSpec.getSize(widthMeasureSpec);
int modeWidth = MeasureSpec.getMode(widthMeasureSpec);
//父控件的宽（wrap_content）
int width = 0;
int childCount = getChildCount();
//重新测量子view的宽度，以及最大高度
for (int i = 0; i < childCount; i++) {
View child = getChildAt(i);
measureChild(child, widthMeasureSpec, heightMeasureSpec);
// LayoutParams lp = child.getLayoutParams();
width += child.getMeasuredWidth();
}
return modeWidth == MeasureSpec.EXACTLY ? sizeWidth : width;
}
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();
//重新测量子view的宽度，以及最大高度
for (int i = 0; i < childCount; i++) {
View child = getChildAt(i);
measureChild(child, widthMeasureSpec, heightMeasureSpec);
height += child.getMeasuredHeight();
}
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;//子View左边的间距
int childWidth;//子View的宽度
int height = getHeight();//屏幕的宽度
int childCount = getChildCount();//子View的数量
for (int i = 0; i < childCount; i++) {
View child = getChildAt(i);
childWidth = child.getMeasuredWidth();
child.layout(childLeft, 0, childLeft + childWidth, height);
childLayout(child);
childLeft += childWidth;
}
}
private void childLayout(View child){
if (child==null){
throw new IllegalStateException("ScrollViewGroup must has one child");
}
if (child instanceof ViewGroup){
if(((ViewGroup)child).getChildCount()>0)
throw new IllegalStateException("view can host only one direct child");
((ViewGroup) child).getChildAt(0).layout(0,0,child.getWidth(),child.getHeight());
}
}
@Override
public LayoutParams generateLayoutParams(AttributeSet attrs) {
return new MarginLayoutParams(getContext(), attrs);
}
public boolean onDown(MotionEvent e) {
//得到最后一个子View
View lastChild = getChildAt(getChildCount() - 1);
//获取滑动的最大滑动距离（最后一个Child的右边框的坐标减去屏幕的宽度）
int finalyChild = (int) (lastChild.getX() + lastChild.getWidth() - screenWidth);
mMaxDistance = finalyChild;
//如果停止滚动则取消动画（即手指按下就停止滚动）
if (!mScroller.isFinished()) {
mScroller.abortAnimation();
}
return false;
}
public boolean onUp(MotionEvent e) {
//如果滑动的距离小于第一个控件的最左边（0）则回弹至（0,0）点
if (getScrollX() <= 0) {
scrollTo(0, 0);
}
//如果滑动的距离大于最大可滑动距离则滑动到最后一个子View
if (getScrollX() >= mMaxDistance) {
scrollTo(mMaxDistance, 0);
}
//刷新界面
invalidate();
return false;
}
public void onShowPress(MotionEvent e) {
}
public boolean onSingleTapUp(MotionEvent e) {
return false;
}
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
//滚动
scrollBy((int) distanceX, 0);
return false;
}
// ACTION_DOWN 、长按不滑动
public void onLongPress(MotionEvent e) {
}
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
mScroller.fling(getScrollX(), 0, (int) -velocityX, 0, 0, mMaxDistance, 0, 0);
return false;
}
private class ScrollTouchLisener implements GestureDetector.OnGestureListener {
//按下事件
@Override
public boolean onDown(MotionEvent e) {
return ScrollViewGroup.this.onDown(e);
}
//单击事件
@Override
public void onShowPress(MotionEvent e) {
ScrollViewGroup.this.onShowPress(e);
}
//手指抬起事件
@Override
public boolean onSingleTapUp(MotionEvent e) {
return ScrollViewGroup.this.onSingleTapUp(e);
}
//滚动事件
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
return ScrollViewGroup.this.onScroll(e1, e2, distanceX, distanceY);
}
//长按事件
@Override
public void onLongPress(MotionEvent e) {
ScrollViewGroup.this.onLongPress(e);
}
//滑动事件
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
return ScrollViewGroup.this.onFling(e1, e2, velocityX, velocityY);
}
}
}
