对于Android来说按键操作已经在减少，越来越多的手势操作层出不穷，今天介绍一款LIstView的Item滑动删除的实现方式。
原理：
利用HorizontalScrollView可以横向滚动的特点实现滑动，根据动态的设置要展示的区域宽度，使得其余选项操作被挤出屏幕外面，从而实现单条滑动菜单的样式。
实现步骤：
- 实现Listview的Item布局文件item_list.layout
<?xml version="1.0" encoding="utf-8"?> <HorizontalScrollView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/hsv" android:layout_width="wrap_content" android:layout_height="80dip" android:scrollbars="none" > <LinearLayout android:layout_width="wrap_content" android:layout_height="match_parent" android:orientation="horizontal" > <LinearLayout android:id="@+id/ll_content" android:layout_width="match_parent" android:layout_height="match_parent" > <TextView android:id="@+id/tv" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" android:text="" /> </LinearLayout> <LinearLayout android:id="@+id/ll_action" android:layout_width="wrap_content" android:layout_height="match_parent" android:orientation="horizontal" > <Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="match_parent" android:background="@android:color/darker_gray" android:paddingLeft="20dip" android:paddingRight="20dip" android:text="@string/action1" /> <Button android:id="@+id/button2" android:layout_width="wrap_content" android:layout_height="match_parent" android:layout_marginLeft="2dip" android:layout_marginRight="2dip" android:background="@android:color/darker_gray" android:paddingLeft="20dip" android:paddingRight="20dip" android:text="@string/action2" /> <Button android:id="@+id/button3" android:layout_width="wrap_content" android:layout_height="match_parent" android:background="@android:color/darker_gray" android:paddingLeft="20dip" android:paddingRight="20dip" android:text="@string/action3" /> </LinearLayout> </LinearLayout> </HorizontalScrollView>
- 准备MainActivity初始化Listview
package com.yzy.horizontalscrollview; import android.app.Activity; import android.os.Bundle; import android.util.DisplayMetrics; import android.widget.ListView; import com.yzy.horizontalscrollview.R; public class MainActivity extends Activity { private ListView mListView; private MyAdapter mAdapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mListView = (ListView) findViewById(R.id.listView); DisplayMetrics dm = new DisplayMetrics(); getWindowManager().getDefaultDisplay().getMetrics(dm); mAdapter = new MyAdapter(this, dm.widthPixels); mListView.setAdapter(mAdapter); } } - 继承BaseAdapter实现自定义的适配器MyAdapter
package com.yzy.horizontalscrollview; import java.util.ArrayList; import java.util.List; import android.content.Context; import android.view.LayoutInflater; import android.view.MotionEvent; import android.view.View; import android.view.ViewGroup; import android.view.ViewGroup.LayoutParams; import android.widget.BaseAdapter; import android.widget.Button; import android.widget.HorizontalScrollView; import android.widget.TextView; import com.yzy.horizontalscrollview.R; public class MyAdapter extends BaseAdapter implements View.OnClickListener { // 数据源，用于存放颜色值的。 private List<Integer> colors; private Context mContext; // 屏幕宽度,由于我们用的是HorizontalScrollView,所以按钮选项应该在屏幕外 private int mScreentWidth; private View view; /** * 构造方法 * * @param context * @param screenWidth */ public MyAdapter(Context context, int screenWidth) { // 初始化 mContext = context; mScreentWidth = screenWidth; // 填充list的内容模拟数据，否则应该异步执行 colors = new ArrayList<Integer>(); for (int i = 0; i < 15; i++) { colors.add(R.color.blue); } } @Override public int getCount() { return colors.size(); } @Override public Object getItem(int position) { return colors.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder; // 如果没有设置过,初始化convertView if (convertView == null) { // 获得设置的view convertView = LayoutInflater.from(mContext).inflate(R.layout.item_list, parent, false); // 初始化holder holder = new ViewHolder(); holder.hSView = (HorizontalScrollView) convertView.findViewById(R.id.hsv); holder.action = convertView.findViewById(R.id.ll_action); holder.btOne = (Button) convertView.findViewById(R.id.button1); holder.btTwo = (Button) convertView.findViewById(R.id.button2); holder.btThree = (Button) convertView.findViewById(R.id.button3); holder.tvContent = (TextView) convertView.findViewById(R.id.tv); // 设置内容view的大小为屏幕宽度,这样按钮就正好被挤出屏幕外 holder.content = convertView.findViewById(R.id.ll_content); LayoutParams lp = holder.content.getLayoutParams(); lp.width = mScreentWidth; convertView.setTag(holder); } else { // 有直接获得ViewHolder holder = (ViewHolder) convertView.getTag(); } // 把位置放到view中,这样点击事件就可以知道点击的是哪一条item holder.btOne.setTag(position); holder.btTwo.setTag(position); holder.btThree.setTag(position); // 设置监听事件 convertView.setOnTouchListener(new View.OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: if (view != null) { ViewHolder viewHolder1 = (ViewHolder) view.getTag(); viewHolder1.hSView.smoothScrollTo(0, 0); } case MotionEvent.ACTION_UP: // 获得ViewHolder ViewHolder viewHolder = (ViewHolder) v.getTag(); view = v; // 获得HorizontalScrollView滑动的水平方向值. int scrollX = viewHolder.hSView.getScrollX(); // 获得操作区域的长度 int actionW = viewHolder.action.getWidth(); // 注意使用smoothScrollTo,这样效果看起来比较圆滑,不生硬 // 如果水平方向的移动值<操作区域的长度的一半,就复原 if (scrollX < actionW / 2) { viewHolder.hSView.smoothScrollTo(0, 0); } else// 否则的话显示操作区域 { viewHolder.hSView.smoothScrollTo(actionW, 0); } return true; } return false; } }); // 这里防止删除一条item后,ListView处于操作状态,直接还原 if (holder.hSView.getScrollX() != 0) { holder.hSView.scrollTo(0, 0); } // 设置背景颜色,设置填充内容. holder.content.setBackgroundResource(colors.get(position)); holder.tvContent.setText("" + position); // 设置监听事件 holder.btOne.setOnClickListener(this); holder.btTwo.setOnClickListener(this); holder.btThree.setOnClickListener(this); return convertView; } /** * ViewHolder * * @Title: * @Description:主要是避免了不断的view获取初始化. * @Author:yzy * @Since:2013-10-22 */ class ViewHolder { public HorizontalScrollView hSView; public View content; public TextView tvContent; public View action; public Button btOne; public Button btTwo; public Button btThree; } @Override public void onClick(View v) { int position = (Integer) v.getTag(); switch (v.getId()) { case R.id.button1: colors.add(R.color.blue); break; case R.id.button2: colors.remove(position); break; case R.id.button3: if (colors.get(position) == R.color.blue) { colors.set(position, R.color.red); } else { colors.set(position, R.color.blue); } break; default: break; } // 刷新ListView内容 notifyDataSetChanged(); } }
效果图：
还有很多的实现方式，希望大家多多指教哦，附件里面是源码本人测试通过的。
下载：ListViewHorizontalScrollview.zip
import android.content.Context; import android.util.AttributeSet; import android.view.GestureDetector; import android.view.GestureDetector.SimpleOnGestureListener; import android.view.MotionEvent; import android.view.View; import android.widget.HorizontalScrollView; public class CustomHScrollView extends HorizontalScrollView{ private GestureDetector mGestureDetector; private View.OnTouchListener mGestureListener; private static final String TAG = "CustomHScrollView"; /** * @function CustomHScrollView constructor * @param context Interface to global information about an application environment. * */ public CustomHScrollView(Context context) { super(context); // TODO Auto-generated constructor stub mGestureDetector = new GestureDetector(new HScrollDetector()); setFadingEdgeLength(0); } /** * @function CustomHScrollView constructor * @param context Interface to global information about an application environment. * @param attrs A collection of attributes, as found associated with a tag in an XML document. */ public CustomHScrollView(Context context, AttributeSet attrs) { super(context, attrs); // TODO Auto-generated constructor stub mGestureDetector = new GestureDetector(new HScrollDetector()); setFadingEdgeLength(0); } /** * @function CustomHScrollView constructor * @param context Interface to global information about an application environment. * @param attrs A collection of attributes, as found associated with a tag in an XML document. * @param defStyle style of view */ public CustomHScrollView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); // TODO Auto-generated constructor stub mGestureDetector = new GestureDetector(new HScrollDetector()); setFadingEdgeLength(0); } @Override public boolean onInterceptTouchEvent(MotionEvent ev) { return super.onInterceptTouchEvent(ev) && mGestureDetector.onTouchEvent(ev); } // Return false if we're scrolling in the y direction class HScrollDetector extends SimpleOnGestureListener { @Override public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) { if(Math.abs(distanceX) > Math.abs(distanceY)) { return true; } return false; } } }