Android：横行滚动且隔行变色的ListView控件
16lz
2021-01-23
效果图
代码
hv_listview_item.xml
<?xml version="1.0" encoding="utf-8"?> hv_listview_layout.xml
<?xml version="1.0" encoding="utf-8"?> HvListView的layout_width是item中列宽的总和。
HvListView.java
import android.content.Context;import android.util.AttributeSet;import android.view.GestureDetector;import android.view.MotionEvent;import android.view.View;import android.view.ViewGroup;import android.widget.LinearLayout;import android.widget.ListView;/** * 横向滚动ListView * 自定义ListView，增加了横向手势监听，并在横向滚动时手动触发Layout容器内的滚动。 */public class HvListView extends ListView { /** 手势 */ private GestureDetector mGesture; /** 列头 */ public LinearLayout mListHead; /** 偏移坐标 */ private int mOffset = 0; /** 屏幕宽度 */ private int screenWidth; /** 构造函数 */ public HvListView(Context context, AttributeSet attrs) { super(context, attrs); mGesture = new GestureDetector(context, mOnGesture); } /** 分发触摸事件 */ @Override public boolean dispatchTouchEvent(MotionEvent ev) { super.dispatchTouchEvent(ev); return mGesture.onTouchEvent(ev); } /** 手势 */ private GestureDetector.OnGestureListener mOnGesture = new GestureDetector.SimpleOnGestureListener() { @Override public boolean onDown(MotionEvent e) { return true; } @Override public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { return false; } /** 滚动 */ @Override public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) { synchronized (HvListView.this) { int moveX = (int) distanceX; int curX = mListHead.getScrollX(); int scrollWidth = getWidth(); int dx = moveX; //控制越界问题 if (curX + moveX < 0) dx = 0; if (curX + moveX + getScreenWidth() > scrollWidth) dx = scrollWidth - getScreenWidth() - curX; mOffset += dx; //根据手势滚动Item视图 for (int i = 0, j = getChildCount(); i < j; i++) { View child = ((ViewGroup) getChildAt(i)).getChildAt(1); if (child.getScrollX() != mOffset) child.scrollTo(mOffset, 0); } mListHead.scrollBy(dx, 0); } requestLayout(); return true; } }; /** * 获取屏幕可见范围内最大屏幕 * @return */ public int getScreenWidth() { if (screenWidth == 0) { screenWidth = getContext().getResources().getDisplayMetrics().widthPixels; if (getChildAt(0) != null) { screenWidth -= ((ViewGroup) getChildAt(0)).getChildAt(0) .getMeasuredWidth(); } else if (mListHead != null) { //减去固定第一列 screenWidth -= mListHead.getChildAt(0).getMeasuredWidth(); } } return screenWidth; } /** 获取列头偏移量 */ public int getHeadScrollX() { return mListHead.getScrollX(); }}HvListViewAdapter.java
import java.util.List;import java.util.Map;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.TextView;/** * 自定义Adapter，填充HvListView，并实现隔行变色的功能 */public class HvListViewAdapter extends BaseAdapter { private List<? extends Map> data = null; private Context context = null; private int resource = 0; private String[] from = null; private int[] to = null; private HvListView listView = null; public HvListViewAdapter(Context context, List<? extends Map> data, int resource, String[] from, int[] to, HvListView listView){ this.context = context; this.data = data; this.resource = resource; this.from = from; this.to = to; this.listView = listView; } @Override public int getCount() { return data.size(); } @Override public View getView(int position, View convertView, ViewGroup parent) { if (convertView == null) { LayoutInflater inflater = LayoutInflater.from(context); convertView = inflater.inflate(resource, null); } for (int i = 0; i < to.length; i++) { ((TextView) convertView.findViewById(to[i])).setText(data.get(position).get(from[i]).toString()); } //校正（处理同时上下和左右滚动出现错位情况） View child = ((ViewGroup) convertView).getChildAt(1); int head = listView.getHeadScrollX(); if (child.getScrollX() != head) { child.scrollTo(listView.getHeadScrollX(), 0); } //隔行变色 if (position % 2 == 0){ convertView.setBackgroundResource(R.color.ivory); }else{ convertView.setBackgroundResource(R.color.peachpuff); } return convertView; } @Override public Object getItem(int position) { return null; } @Override public long getItemId(int position) { return 0; }} HvListViewActivity.java
import android.app.Activity;import android.os.Bundle;import android.widget.LinearLayout;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;public class HvListViewActivity extends Activity { private HvListView listView; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.hv_listview_layout); listView = (HvListView)findViewById(R.id.hv_listview); listView.mListHead = (LinearLayout)findViewById(R.id.hv_listview_item_head); initData(); } private void initData(){ List> data = new ArrayList>(); for (int i=0;i<50;i++){ Map item = new HashMap(); item.put("c1", i+"行1列"); item.put("c2", i+"行2列"); item.put("c3", i+"行3列"); item.put("c4", i+"行4列"); item.put("c5", i+"行5列"); item.put("c6", i+"行6列"); data.add(item); } HvListViewAdapter adapter = new HvListViewAdapter(this, data, R.layout.hv_listview_item, new String[]{ "c1", "c2", "c3", "c4", "c5", "c6" }, new int[]{ R.id.hv_listview_item_column1, R.id.hv_listview_item_column2, R.id.hv_listview_item_column3, R.id.hv_listview_item_column4, R.id.hv_listview_item_column5, R.id.hv_listview_item_column6 }, listView ); listView.setAdapter(adapter); }} 从代码看得出，本办法比较麻烦的是需要自己来指定固定宽度。在企业应用展示多行多列数据时还是非常有用的，比如炒股软件也有这样的需求。
当前不支持Fling操作，所以即使用力滑也不好滑太多。
参考：Android支持横行滚动的ListView控件
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