xml引用
代码初始化
控件代码
package com.feilu.investadviser.ui.main.widget; import android.content.Context; import android.graphics.Color; import android.util.AttributeSet; import android.util.DisplayMetrics; import android.util.Log; import android.view.MotionEvent; import android.view.View; import android.view.WindowManager; import android.widget.HorizontalScrollView; import android.widget.LinearLayout; import com.feilu.investadviser.ui.main.adapter.HorizontalScrollViewAdapter; import java.util.HashMap; import java.util.Map; public class HzScrollView extends HorizontalScrollView implements View.OnClickListener { /** * 图片滚动时的回调接口 * */ public interface CurrentImageChangeListener { void onCurrentImgChanged(int position, View viewIndicator); } /** * 条目点击时的回调 * */ public interface OnItemClickListener { void onClick(View view, int pos); } private CurrentImageChangeListener mListener; private OnItemClickListener mOnClickListener; private static final String TAG = "HzScrollView"; /** * HorizontalListView中的LinearLayout */ private LinearLayout mContainer; /** * 子元素的宽度 */ private int mChildWidth; /** * 子元素的高度 */ private int mChildHeight; /** * 当前最后一张图片的index */ private int mCurrentIndex; /** * 当前第一张图片的下标 */ private int mFristIndex; /** * 当前第一个View */ private View mFirstView; /** * 数据适配器 */ private HorizontalScrollViewAdapter mAdapter; /** * 每屏幕最多显示的个数 */ private int mCountOneScreen; /** * 屏幕的宽度 */ private int mScreenWitdh; /** * 保存View与位置的键值对 */ private Map<View, Integer> mViewPos = new HashMap<View, Integer>(); public HzScrollView(Context context, AttributeSet attrs) { super(context, attrs); // 获得屏幕宽度 WindowManager wm = (WindowManager) context .getSystemService(Context.WINDOW_SERVICE); DisplayMetrics outMetrics = new DisplayMetrics(); wm.getDefaultDisplay().getMetrics(outMetrics); mScreenWitdh = outMetrics.widthPixels; } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); mContainer = (LinearLayout) getChildAt(0); } /** * 加载下一张图片 */ protected void loadNextImg() { // 数组边界值计算 if (mCurrentIndex == mAdapter.getCount() - 1) { return; } // 移除第一张图片，且将水平滚动位置置0 scrollTo(0, 0); mViewPos.remove(mContainer.getChildAt(0)); mContainer.removeViewAt(0); // 获取下一张图片，并且设置onclick事件，且加入容器中 View view = mAdapter.getView(++mCurrentIndex, null, mContainer); view.setOnClickListener(this); mContainer.addView(view); mViewPos.put(view, mCurrentIndex); // 当前第一张图片小标 mFristIndex++; // 如果设置了滚动监听则触发 if (mListener != null) { notifyCurrentImgChanged(); } } /** * 加载前一张图片 */ protected void loadPreImg() { // 如果当前已经是第一张，则返回 if (mFristIndex == 0) return; // 获得当前应该显示为第一张图片的下标 int index = mCurrentIndex - mCountOneScreen; if (index >= 0) { // mContainer = (LinearLayout) getChildAt(0); // 移除最后一张 int oldViewPos = mContainer.getChildCount() - 1; mViewPos.remove(mContainer.getChildAt(oldViewPos)); mContainer.removeViewAt(oldViewPos); // 将此View放入第一个位置 View view = mAdapter.getView(index, null, mContainer); mViewPos.put(view, index); mContainer.addView(view, 0); view.setOnClickListener(this); // 水平滚动位置向左移动view的宽度个像素 scrollTo(mChildWidth, 0); // 当前位置--，当前第一个显示的下标-- mCurrentIndex--; mFristIndex--; // 回调 if (mListener != null) { notifyCurrentImgChanged(); } } } /** * 滑动时的回调 */ public void notifyCurrentImgChanged() { // 先清除所有的背景色，点击时会设置为蓝色 for (int i = 0; i < mContainer.getChildCount(); i++) { mContainer.getChildAt(i).setBackgroundColor(Color.WHITE); } mListener.onCurrentImgChanged(mFristIndex, mContainer.getChildAt(0)); } /** * 初始化数据，设置数据适配器 * */ public void initDatas(HorizontalScrollViewAdapter mAdapter) { this.mAdapter = mAdapter; mContainer = (LinearLayout) getChildAt(0); // 获得适配器中第一个View final View view = mAdapter.getView(0, null, mContainer); mContainer.addView(view); // 强制计算当前View的宽和高 if (mChildWidth == 0 && mChildHeight == 0) { int w = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED); int h = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED); view.measure(w, h); mChildHeight = view.getMeasuredHeight(); mChildWidth = view.getMeasuredWidth(); Log.e(TAG, view.getMeasuredWidth() + "," + view.getMeasuredHeight()); mChildHeight = view.getMeasuredHeight(); // 计算每次加载多少个View mCountOneScreen = mScreenWitdh / mChildWidth + 2; Log.e(TAG, "mCountOneScreen = " + mCountOneScreen + " ,mChildWidth = " + mChildWidth); } // 初始化第一屏幕的元素 initFirstScreenChildren(mAdapter.getCount()); } /** * 加载第一屏的View * * @param mCountOneScreen */ public void initFirstScreenChildren(int mCountOneScreen) { mContainer = (LinearLayout) getChildAt(0); mContainer.removeAllViews(); mViewPos.clear(); for (int i = 0; i < mCountOneScreen; i++) { View view = mAdapter.getView(i, null, mContainer); view.setOnClickListener(this); mContainer.addView(view); mViewPos.put(view, i); mCurrentIndex = i; } if (mListener != null) { notifyCurrentImgChanged(); } } @Override public boolean onTouchEvent(MotionEvent ev) { switch (ev.getAction()) { case MotionEvent.ACTION_MOVE: // Log.e(TAG, getScrollX() + ""); int scrollX = getScrollX(); // 如果当前scrollX为view的宽度，加载下一张，移除第一张 if (scrollX >= mChildWidth) { loadNextImg(); } // 如果当前scrollX = 0， 往前设置一张，移除最后一张 if (scrollX == 0) { loadPreImg(); } break; } return super.onTouchEvent(ev); } @Override public void onClick(View v) { if (mOnClickListener != null) { for (int i = 0; i < mContainer.getChildCount(); i++) { mContainer.getChildAt(i).setBackgroundColor(Color.WHITE); } mOnClickListener.onClick(v, mViewPos.get(v)); } } public void setOnItemClickListener(OnItemClickListener mOnClickListener) { this.mOnClickListener = mOnClickListener; } public void setCurrentImageChangeListener( CurrentImageChangeListener mListener) { this.mListener = mListener; } }
adapter
package com.feilu.investadviser.ui.main.adapter; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ImageView; import android.widget.TextView; import com.feilu.investadviser.R; import com.feilu.investadviser.ui.main.bean.RanksRenQiEntity; import java.util.List; public class HorizontalScrollViewAdapter { private Context context; private LayoutInflater mInflater; private List<RanksRenQiEntity.DataBean> mDatas; public HorizontalScrollViewAdapter(Context context, List<RanksRenQiEntity.DataBean> mDatas) { this.context = context; mInflater = LayoutInflater.from(context); this.mDatas = mDatas; } public int getCount() { return mDatas.size(); } public RanksRenQiEntity.DataBean getItem(int position) { return mDatas.get(position); } public long getItemId(int position) { return position; } public void setList(List<RanksRenQiEntity.DataBean> mDatas){ this.mDatas.clear(); this.mDatas.addAll(mDatas); } public View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder = null; if (convertView == null) { holder = new ViewHolder(); convertView = mInflater.inflate(R.layout.item_ranks_scroll, parent, false); // holder.mImg = (ImageView) convertView.findViewById(R.id.img); // holder.del = (ImageView) convertView.findViewById(R.id.del); convertView.setTag(holder); } else { holder = (ViewHolder) convertView.getTag(); } return convertView; } static class ViewHolder { } }
