横向滑动选择，自定义adapter，支持adapter宽度不一样，兼容性高
selectView = new LateralSlidingSelectionView(this); selectView.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,width/4)); selectView.setmIndex(index);//默认为0 final String[] text = new String[10]; text[0] = "可以"; text[1] = "可以大发"; text[2] = "可以大发"; text[3] = "可以大发"; text[4] = "可以范德萨发"; text[5] = "可以范德萨发"; text[6] = "可以范德萨发"; text[7] = "可"; text[8] = "可"; text[9] = "可以大"; final LateralSlidingSeletionAdapter adapter = new LateralSlidingSeletionAdapter(this,text); selectView.setMyOnListener(new LateralSlidingSelectionViewListener() { @Override public void click(int index) { Log.d("LateralSlidingSelection2View",text[index]); adapter.setSelectIndex(index); adapter.notifyDataSetChanged(); selectView.updataAdapter(adapter); } }); selectView.setAdapter(adapter); selectView.startCanvase();
public class LateralSlidingSelectionView extends LinearLayout { private Context mContext; private OverScroller mOverScroller; private LateralSlidingSelectionViewListener mOnListener; private float downX; private float moveX; private Adapter mAdapter; private int mIndex; private LinearLayout linearLayout; private int[] adapterWidth; private int mStartX = 0; private int linearLayoutWidth; private int disX; private int mMoveStartX; public LateralSlidingSelectionView(Context context) { super(context); init(context); } public LateralSlidingSelectionView(Context context, AttributeSet attrs) { super(context, attrs); init(context); } public LateralSlidingSelectionView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); init(context); } public void startCanvase(){ addView(); } private void addView(){ if(mAdapter == null) return; removeAllViews(); adapterWidth = new int[mAdapter.getCount()]; linearLayout = new LinearLayout(mContext); LayoutParams linearLayoutParams = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); linearLayout.setLayoutParams(linearLayoutParams); linearLayout.setGravity(Gravity.CENTER); for (int i = 0; i < mAdapter.getCount(); i++) { View v = mAdapter.getView(i, null, null); final int finalI = i; v.setOnTouchListener(new OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: downX = event.getRawX(); disX = 0; break; case MotionEvent.ACTION_MOVE: moveX = event.getRawX(); disX = (int)(moveX - downX); smoothScrollTo(-disX-mStartX); mMoveStartX = mStartX + disX; int index = getUpIndex(mMoveStartX);//滑动过程中计算index if(mIndex!=index){ mIndex = index; if(mOnListener!=null){ mOnListener.click(index); } } break; case MotionEvent.ACTION_UP: //判断滑动是否超过10 if(Math.abs(disX) > 10) { mStartX += disX; setIndex(getUpIndex(mStartX)); }else{ mIndex = finalI; if(mOnListener!=null){ mOnListener.click(finalI); } setIndex(finalI); } break; } return true; } }); adapterWidth[i] = getViewWidth(v); linearLayout.addView(v); } //计算adapter 总宽度 int adapterWidths = 0; for (int i = 0; i < adapterWidth.length; i++) { adapterWidths += adapterWidth[i]; } linearLayout.setLayoutParams(new LayoutParams(adapterWidths, ViewGroup.LayoutParams.WRAP_CONTENT)); addView(linearLayout); linearLayoutWidth = getViewWidth(linearLayout); setIndex(mIndex); } /** * 根据滑动偏移计算index * @return */ private int getUpIndex(int movelenght){ int index = 0; int leftWidth = linearLayoutWidth/2-movelenght; if(leftWidth>=linearLayoutWidth){//判断是否划过超过右边 index = adapterWidth.length-1; }else{ int leftValue = 0; for (int j = 0; j < adapterWidth.length; j++) { leftValue += adapterWidth[j]; if (leftValue >= leftWidth) { index = j; break; } } } return index; } /** * 定位到该位置 * @param index */ private void setIndex(int index){ if (index>adapterWidth.length-1) index = 0; int leftValue = 0; for (int i = 0; i < index; i++) { leftValue += adapterWidth[i]; } mStartX = linearLayoutWidth/2-leftValue-adapterWidth[index]/2; smoothScrollTo(-mStartX); } /** * 更新adapter * @param adapter */ public void updataAdapter(Adapter adapter){ setAdapter(adapter); addView(); } /** * 初始化 * @param context */ private void init(Context context) { mContext = context; mOverScroller = new OverScroller(getContext()); setOverScrollMode(OVER_SCROLL_ALWAYS); setOrientation(LinearLayout.HORIZONTAL); setGravity(Gravity.CENTER); } public void setMyOnListener(LateralSlidingSelectionViewListener onListener){ this.mOnListener = onListener; } public void setAdapter(Adapter adapter) { this.mAdapter = adapter; } public void setmIndex(int mIndex) { this.mIndex = mIndex; } //调用此方法滚动到目标位置 public void smoothScrollTo(int fx) { int dx = fx - mOverScroller.getFinalX(); smoothScrollBy(dx, mOverScroller.getFinalY()); } //调用此方法设置滚动的相对偏移 public void smoothScrollBy(int dx, int dy) { //设置mScroller的滚动偏移量 mOverScroller.startScroll(mOverScroller.getFinalX(), mOverScroller.getFinalY(), dx, dy); invalidate();//这里必须调用invalidate()才能保证computeScroll()会被调用，否则不一定会刷新界面，看不到滚动效果 } @Override public void computeScroll() { //先判断mScroller滚动是否完成 if (mOverScroller.computeScrollOffset()) { //这里调用View的scrollTo()完成实际的滚动 scrollTo(mOverScroller.getCurrX(), mOverScroller.getCurrY()); //必须调用该方法，否则不一定能看到滚动效果 postInvalidate(); } super.computeScroll(); } /** * 获取控件的宽度 * @param view * @return */ public static int getViewWidth(View view) { int width = 0; width = view.getWidth(); if (width <= 0) { measureView(view); width = view.getMeasuredWidth(); } return width; } /** * 测量角度 * @param v */ public static void measureView(View v) { int w = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED); int h = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED); v.measure(w, h); }
}
public abstract class LateralSlidingSelectionViewListener { public abstract void click(int index); }