編輯:關於Android編程
在自定義viewgroup(5):http://www.jb51.net/article/100639.htm的基礎上,添加使用adapter來適配數據,這樣更加的方便,這裡只是使用adapter適配數據,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; /** * 自定義ViewGroup(橫向滾動) */ public class ScrollViewGroup extends ViewGroup { //滾動計算輔助類 private Scroller mScroller; //屏幕寬度 private int screenWidth; //可以移動的最大距離 private int mMaxDistance; //自定義手勢監聽類 private ScrollTouchLisener mTouchLisener; //手勢監聽 private GestureDetector mDetector; private BaseAdapter mAdapter; /** * 使用new關鍵字創建對象的時候調用 */ public ScrollViewGroup(Context context) { this(context, null); } /** * 在XML文件中使用的時候調用 */ public ScrollViewGroup(Context context, AttributeSet attrs) { this(context, attrs, 0); } /** * 在xml文件中調用,並且使用了自定義屬性的時候調用 */ public ScrollViewGroup(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); init(context); } /** * 初始化方法 * 初始化滾動輔助類Scroller以及計算出屏幕寬度 */ private void init(Context context) { //初始化輔助類 mScroller = new Scroller(context); //獲取屏幕寬度 WindowManager manager = (WindowManager) context .getSystemService(Context.WINDOW_SERVICE); DisplayMetrics outMetrics = new DisplayMetrics(); manager.getDefaultDisplay().getMetrics(outMetrics); screenWidth = outMetrics.widthPixels; //手勢指示器初始化 mTouchLisener = new ScrollTouchLisener(); mDetector = new GestureDetector(context, mTouchLisener); } /** * 滾動時需要重寫的方法,用於控制滾動 */ @Override public void computeScroll() { //判斷滾動時候停止 if (mScroller.computeScrollOffset()) { //滾動到指定的位置 scrollTo(mScroller.getCurrX(), mScroller.getCurrY()); //這句話必須寫,否則不能實時刷新 invalidate(); } } /** * 手指觸屏事件監聽 */ @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(); } /* *測量方法,測量父布局的寬度和高度 */ @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); } //重新設置寬高 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); // LayoutParams lp = child.getLayoutParams(); /* MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); int childWidth = child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin; width += childWidth;*/ width += child.getMeasuredWidth(); } 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 += child.getMeasuredHeight(); } height = height / childCount; return modeHeight == MeasureSpec.EXACTLY ? sizeHeight : height; } /** * 給子布局設定位置 */ @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { int childLeft = 0;//子View左邊的間距 int childWidth;//子View的寬度 int height = getHeight();//屏幕的寬度 int childCount = getChildCount();//子View的數量 for (int i = 0; i < childCount; i++) { View child = getChildAt(i); /* MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); childWidth = child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin;*/ childWidth = child.getMeasuredWidth(); child.layout(childLeft, 0, childLeft + childWidth, height); childLayout(child); childLeft += childWidth; } } /** *讓子View的子View和子View大小一樣 */ 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); } /* *按下事件 ACTION_DOWN */ public boolean onDown(MotionEvent e) { //得到最後一個子View View lastChild = getChildAt(getChildCount() - 1); //獲取滑動的最大滑動距離(最後一個Child的右邊框的坐標減去屏幕的寬度) int finalyChild = (int) (lastChild.getX() + lastChild.getWidth() - screenWidth); mMaxDistance = finalyChild; //如果停止滾動則取消動畫(即手指按下就停止滾動) if (!mScroller.isFinished()) { mScroller.abortAnimation(); } return false; } /* *抬起事件 ACTION_UP */ public boolean onUp(MotionEvent e) { //如果滑動的距離小於第一個控件的最左邊(0)則回彈至(0,0)點 if (getScrollX() <= 0) { scrollTo(0, 0); } //如果滑動的距離大於最大可滑動距離則滑動到最後一個子View if (getScrollX() >= mMaxDistance) { scrollTo(mMaxDistance, 0); } //刷新界面 invalidate(); return false; } /* *ACTION_DOWN 、短按不移動 */ public void onShowPress(MotionEvent e) { } /* *短按ACTION_DOWN、ACTION_UP */ public boolean onSingleTapUp(MotionEvent e) { return false; } /* *ACTION_DOWN 、慢滑動 */ public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) { //滾動 scrollBy((int) distanceX, 0); return false; } // ACTION_DOWN 、長按不滑動 public void onLongPress(MotionEvent e) { } /* *ACTION_DOWN 、快滑動、 ACTION_UP */ public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { mScroller.fling(getScrollX(), 0, (int) -velocityX, 0, 0, mMaxDistance, 0, 0); return false; } /** * 自定義手勢監聽類 */ private class ScrollTouchLisener implements GestureDetector.OnGestureListener { //按下事件 @Override public boolean onDown(MotionEvent e) { return ScrollViewGroup.this.onDown(e); } //單擊事件 @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); } //滾動事件 @Override public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) { return ScrollViewGroup.this.onScroll(e1, e2, distanceX, distanceY); } //長按事件 @Override public void onLongPress(MotionEvent e) { ScrollViewGroup.this.onLongPress(e); } //滑動事件 @Override public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { return ScrollViewGroup.this.onFling(e1, e2, velocityX, velocityY); } } }
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