自定义ListView侧滑删除
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1、MainActivity
package com.example.lenovo.slider;import java.util.ArrayList;import java.util.List;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.view.ViewGroup;import android.widget.AdapterView;import android.widget.BaseAdapter;import android.widget.RelativeLayout;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends Activity implements AdapterView.OnItemClickListener { private SlideListView2 mListView; private SlideAdapter adapter; private List<TestModel> listModels = new ArrayList<TestModel>(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_list); adapter = new SlideAdapter(); mListView = (SlideListView2) this.findViewById(R.id.listview_list); mListView.initSlideMode(SlideListView2.MOD_BOTH); for (int i = 0; i < 40; i++) { TestModel item = new TestModel(); item.setTitle(i + "、这里是title"); item.setContent(i + "、这里是内容"); item.setTime(i + "、这里是时间"); listModels.add(item); } mListView.setAdapter(adapter); mListView.setOnItemClickListener(this); } private class SlideAdapter extends BaseAdapter { @Override public int getCount() { return listModels.size(); } @Override public Object getItem(int position) { return listModels.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(final int position, View convertView, ViewGroup parent) { ViewHolder holder = new ViewHolder(); if (convertView == null) { convertView = MainActivity.this.getLayoutInflater().inflate(R.layout.layout_list_item, null); holder.title = (TextView) convertView.findViewById(R.id.title); holder.time = (TextView) convertView.findViewById(R.id.time); holder.content = (TextView) convertView.findViewById(R.id.content); holder.delete2 = (RelativeLayout)convertView.findViewById(R.id.delete2); //holder.other2 = (RelativeLayout)convertView.findViewById(R.id.other2); convertView.setTag(holder); } else { holder = (ViewHolder) convertView.getTag(); } TestModel item = listModels.get(position); holder.title.setText(item.getTitle()); holder.content.setText(item.getContent()); holder.time.setText(item.getTime()); holder.delete2.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub //刪除操作 Toast.makeText(MainActivity.this, "删除" + position, Toast.LENGTH_SHORT).show(); mListView.slideBack(); } }); /* holder.other2.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { Toast.makeText(MainActivity.this, "右其他" + position, Toast.LENGTH_SHORT).show(); mListView.slideBack(); } });*/ return convertView; } } private static class ViewHolder { public TextView title; public TextView time; public TextView content; public RelativeLayout delete2; } @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { Toast.makeText(MainActivity.this, "点击" + position, Toast.LENGTH_SHORT).show(); }}2、自定义的ListView，控制滑动删除
import android.content.Context;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.VelocityTracker;import android.view.View;import android.view.ViewConfiguration;import android.view.WindowManager;import android.widget.AdapterView;import android.widget.ListView;import android.widget.Scroller;/** * 侧滑删除Item的ListView，此处是对网上开源的一个Listview的完善， * 实现在手指滑动时item的透明度随之改变，并增加回到原位置的动画过程 * @author zhangshuo */public class SlideListView extends ListView { /** * 当前滑动的ListView position */ private int slidePosition; /** * 手指按下X的坐标 */ private int downY; /** * 手指按下Y的坐标 */ private int downX; /** * 屏幕宽度 */ private int screenWidth; /** * ListView的item */ private View itemView; /** * 滑动类 */ private Scroller scroller; private static final int SNAP_VELOCITY = 600; /** * 速度追踪对象 */ private VelocityTracker velocityTracker; /** * 是否响应滑动，默认为不响应 */ private boolean isSlide = false; /** * 认为是用户滑动的最小距离 */ private int mTouchSlop; /** * 移除item后的回调接口 */ private RemoveListener mRemoveListener; /** * 标示是否移除 */ private boolean isRemove = false; /** * 用来指示item滑出屏幕的方向,向左或者向右,用一个枚举值来标记 */ private RemoveDirection removeDirection; // 滑动删除方向的枚举值 public enum RemoveDirection { RIGHT, LEFT, NONE; } public SlideListView(Context context) { this(context, null); } public SlideListView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public SlideListView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); screenWidth = ((WindowManager) context.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay().getWidth(); scroller = new Scroller(context); mTouchSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop(); } /** * 设置滑动删除的回调接口 * @param removeListener */ public void setRemoveListener(RemoveListener removeListener) { this.mRemoveListener = removeListener; } /** * 分发事件，主要做的是判断点击的是那个item, 以及通过postDelayed来设置响应左右滑动事件 */ @Override public boolean dispatchTouchEvent(MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: { System.out.println("dispatch-->" + "down"); addVelocityTracker(event); // 假如scroller滚动还没有结束，我们直接返回 if (!scroller.isFinished()) { return false; } downX = (int) event.getX(); downY = (int) event.getY(); slidePosition = pointToPosition(downX, downY); // 无效的position, 不做任何处理 if (slidePosition == AdapterView.INVALID_POSITION) { return super.dispatchTouchEvent(event); } // 获取我们点击的item view itemView = getChildAt(slidePosition - getFirstVisiblePosition()); break; } case MotionEvent.ACTION_MOVE: { System.out.println("dispatch-->" + "move"); if (Math.abs(getScrollVelocity()) > SNAP_VELOCITY || (Math.abs(event.getX() - downX) > mTouchSlop && Math .abs(event.getY() - downY) < mTouchSlop)) { isSlide = true; } break; } case MotionEvent.ACTION_UP: recycleVelocityTracker(); break; } return super.dispatchTouchEvent(event); } /** * 往右滑动，getScrollX()返回的是左边缘的距离，就是以View左边缘为原点到开始滑动的距离，所以向右边滑动为负值 */ private void scrollRight() { removeDirection = RemoveDirection.RIGHT; final int delta = (screenWidth + itemView.getScrollX()); // 调用startScroll方法来设置一些滚动的参数，我们在computeScroll()方法中调用scrollTo来滚动item scroller.startScroll(itemView.getScrollX(), 0, -delta, 0, Math.abs(delta)); postInvalidate(); // 刷新itemView } /** * 向左滑动，根据上面我们知道向左滑动为正值 */ private void scrollLeft() { removeDirection = RemoveDirection.LEFT; final int delta = (screenWidth - itemView.getScrollX()); // 调用startScroll方法来设置一些滚动的参数，我们在computeScroll()方法中调用scrollTo来滚动item scroller.startScroll(itemView.getScrollX(), 0, delta, 0, Math.abs(delta)); postInvalidate(); // 刷新itemView } /** * 滑动会原来的位置 */ private void scrollBack(){ removeDirection = RemoveDirection.NONE; scroller.startScroll(itemView.getScrollX(), 0, -itemView.getScrollX(), 0, Math.abs(itemView.getScrollX())); postInvalidate(); // 刷新itemView } /** * 根据手指滚动itemView的距离来判断是滚动到开始位置还是向左或者向右滚动 */ private void scrollByDistanceX() { // 如果向左滚动的距离大于屏幕的二分之一，就让其删除 if (itemView.getScrollX() >= screenWidth / 2) { scrollLeft(); } else if (itemView.getScrollX() <= -screenWidth / 2) { scrollRight(); } else { // 滚回到原始位置 scrollBack(); } } /** * 处理我们拖动ListView item的逻辑 */ @Override public boolean onTouchEvent(MotionEvent ev) { if (isSlide && slidePosition != AdapterView.INVALID_POSITION) { System.out.println("touch-->" + "开始"); requestDisallowInterceptTouchEvent(true); addVelocityTracker(ev); final int action = ev.getAction(); int x = (int) ev.getX(); switch (action) { case MotionEvent.ACTION_DOWN: System.out.println("touch-->" + "down"); break; case MotionEvent.ACTION_MOVE: System.out.println("touch-->" + "move"); MotionEvent cancelEvent = MotionEvent.obtain(ev); cancelEvent.setAction(MotionEvent.ACTION_CANCEL | (ev.getActionIndex()<< MotionEvent.ACTION_POINTER_INDEX_SHIFT)); onTouchEvent(cancelEvent); int deltaX = downX - x; // 手指拖动itemView滚动, deltaX大于0向左滚动，小于0向右滚 itemView.scrollTo(deltaX, 0); // 根据手指滑动的距离，调整透明度 itemView.setAlpha(1f - Math.abs((float)deltaX/screenWidth)); return true; //拖动的时候ListView不滚动 case MotionEvent.ACTION_UP: System.out.println("touch-->" + "up"); // 手指离开的时候就不响应左右滚动 isSlide = false; int velocityX = getScrollVelocity(); if (velocityX > SNAP_VELOCITY) { scrollRight(); } else if (velocityX < -SNAP_VELOCITY) { scrollLeft(); } else { scrollByDistanceX(); } recycleVelocityTracker(); break; } } //否则直接交给ListView来处理onTouchEvent事件 return super.onTouchEvent(ev); } @Override public void computeScroll() { // 调用startScroll的时候scroller.computeScrollOffset()返回true， if (scroller.computeScrollOffset()) { // 让ListView item根据当前的滚动偏移量进行滚动 itemView.scrollTo(scroller.getCurrX(), scroller.getCurrY()); itemView.setAlpha(1f - Math.abs((float)scroller.getCurrX()/screenWidth)); postInvalidate(); // 滚动动画结束的时候调用回调接口 if (scroller.isFinished() && removeDirection != RemoveDirection.NONE) { if (mRemoveListener == null) { throw new NullPointerException("RemoveListener is null, we should called setRemoveListener()"); } itemView.scrollTo(0, 0); itemView.setAlpha(1f); mRemoveListener.removeItem(removeDirection, slidePosition); } } } /** * 添加用户的速度跟踪器 * * @param event */ private void addVelocityTracker(MotionEvent event) { if (velocityTracker == null) { velocityTracker = VelocityTracker.obtain(); } velocityTracker.addMovement(event); } /** * 移除用户速度跟踪器 */ private void recycleVelocityTracker() { if (velocityTracker != null) { velocityTracker.recycle(); velocityTracker = null; } } /** * 获取X方向的滑动速度,大于0向右滑动，反之向左 * * @return */ private int getScrollVelocity() { velocityTracker.computeCurrentVelocity(1000); int velocity = (int) velocityTracker.getXVelocity(); return velocity; } /** * * 当ListView item滑出屏幕，回调这个接口 * 我们需要在回调方法removeItem()中移除该Item,然后刷新ListView * * @author xiaanming * */ public interface RemoveListener { public void removeItem(RemoveDirection direction, int position); }3、数据封装javabean
package com.example.lenovo.slider;public class TestModel { private String title; private String time; private String content; public String getTitle() { return title; } public void setTitle(String title) { this.title = title; } public String getTime() { return time; } public void setTime(String time) { this.time = time; } public String getContent() { return content; } public void setContent(String content) { this.content = content; }}4、界面
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingLeft="-181dp" android:paddingRight="-180dp" android:background="@color/wheat" android:orientation="horizontal" > <LinearLayout android:id="@+id/llayout_left" android:layout_width="180dp" android:layout_height="match_parent" > <RelativeLayout android:id="@+id/delete1" android:layout_width="90dp" android:layout_height="match_parent" android:background="@color/slategray" android:clickable="true" > <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:gravity="center" android:text="左删除" android:textColor="@color/floralwhite" android:textSize="15sp" /> </RelativeLayout> <RelativeLayout android:id="@+id/other1" android:layout_width="90dp" android:layout_height="match_parent" android:background="@color/tomato" android:clickable="true" > <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:gravity="center" android:text="左其他" android:textColor="@color/floralwhite" android:textSize="15sp" /> </RelativeLayout> </LinearLayout> <RelativeLayout android:layout_width="match_parent" android:layout_height="match_parent"> <LinearLayout android:id="@+id/llayout_right" android:layout_width="90dp" android:layout_height="match_parent" android:layout_alignParentRight="true" > <RelativeLayout android:id="@+id/delete2" android:layout_width="90dp" android:layout_height="match_parent" android:background="@color/tomato" android:clickable="true" > <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:gravity="center" android:text="delete" android:textStyle="bold" android:textColor="@color/floralwhite" android:textSize="20sp" /> </RelativeLayout> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:layout_alignParentTop="true" android:layout_alignParentStart="true"> <TextView android:id="@+id/title" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center_vertical" android:paddingLeft="10dp" android:paddingRight="10dp" android:text="标题" android:textColor="@color/orange" android:textSize="17sp" /> <TextView android:id="@+id/time" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="10dp" android:text="时间" android:textColor="@color/black" android:textSize="13sp" /> <TextView android:id="@+id/content" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="10dp" android:text="内容" android:textColor="@color/black" android:textSize="13sp" /> </LinearLayout> </RelativeLayout></LinearLayout><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.example.lenovo.slider.MainActivity" android:background="#fff" > <com.example.lenovo.slider.SlideListView2 android:id="@+id/listview_list" android:layout_width="match_parent" android:layout_height="match_parent" android:background="#fff4f7f9" android:cacheColorHint="#00000000" android:divider="#dddbdb" android:dividerHeight="1.0px" android:drawSelectorOnTop="false" android:listSelector="@android:color/transparent" android:scrollbars="none" /></RelativeLayout> 0 0
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