在实际项目中删除列表中的某一项是非常常见的功能，传统的做法可以使用长按监听器等，而现在流行的做法是左滑弹出删除按钮，微信，QQ等都是这么做的，下面做一个示例，代码如下：
主页面MainActivity：代码比较简单常规
package com.home.testslideview;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.os.Bundle;
import android.widget.ListView;
import com.home.textslideview.R;
public class MainActivity extends Activity {
private ListView listView;
private List<NewInfoBean> list = new ArrayList<NewInfoBean>();
// 适配器
private SlideAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
initView();
initData();
setAdapter();
}
/**
* 初始化页面控件
*/
private void initView() {
listView = (ListView) findViewById(R.id.main_lv);
}
/**
* 初始化数据
*/
private void initData() {
list.add(new NewInfoBean("这是测试内容1"));
list.add(new NewInfoBean("这是测试内容2"));
list.add(new NewInfoBean("这是测试内容3"));
list.add(new NewInfoBean("这是测试内容4"));
list.add(new NewInfoBean("这是测试内容5"));
list.add(new NewInfoBean("这是测试内容6"));
list.add(new NewInfoBean("这是测试内容7"));
list.add(new NewInfoBean("这是测试内容8"));
list.add(new NewInfoBean("这是测试内容9"));
list.add(new NewInfoBean("这是测试内容10"));
}
/**
* 设置适配器
*/
private void setAdapter() {
if (adapter == null) {
adapter = new SlideAdapter(this, list);
listView.setAdapter(adapter);
} else {
adapter.setList(list);
adapter.notifyDataSetChanged();
}
}
}
package com.home.testslideview;
public class NewInfoBean {
public SlideView slideView;
private String content;
public SlideView getSlideView() {
return slideView;
}
public void setSlideView(SlideView slideView) {
this.slideView = slideView;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
public NewInfoBean() {
super();
}
public NewInfoBean(String content) {
super();
this.content = content;
}
}
适配器SlideAdapter：也比较简单
package com.home.testslideview;
import java.util.List;
import android.content.Context;
import android.util.SparseArray;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import com.home.testslideview.SlideView.OnSlideListener;
import com.home.textslideview.R;
public class SlideAdapter extends BaseAdapter implements OnSlideListener,
OnClickListener {
private LayoutInflater inflater;
private List<NewInfoBean> list;
private Context context;
public SlideAdapter(Context context, List<NewInfoBean> list) {
if (inflater == null) {
inflater = LayoutInflater.from(context);
}
this.list = list;
this.context = context;
}
@Override
public int getCount() {
return list.size();
}
@Override
public Object getItem(int position) {
return list.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup arg2) {
SlideView slideView = (SlideView) convertView;
NewInfoBean bean = list.get(position);
if (slideView == null) {
slideView = new SlideView(context);
slideView.setOnSlideListener(this);
}
// 设置内容
TextView contentText = getAdapterView(slideView,
R.id.slideview_tv_content, position);
contentText.setText(bean.getContent());
// 删除按钮
TextView delText = getAdapterView(slideView, R.id.slideview_tv_del,
position);
delText.setOnClickListener(this);
bean.slideView = slideView;
bean.slideView.shrink();
return slideView;
}
@SuppressWarnings("unchecked")
public <T extends View> T getAdapterView(View convertView, int id,
Object tag) {
SparseArray<View> viewHolder = null;
try {
if (convertView.getTag(R.id.view_holder) instanceof SparseArray<?>) {
viewHolder = (SparseArray<View>) convertView
.getTag(R.id.view_holder);
}
} catch (ClassCastException e) {
}
if (viewHolder == null) {
viewHolder = new SparseArray<View>();
convertView.setTag(R.id.view_holder, viewHolder);
convertView.setTag(R.id.order_id, tag);
}
View childView = viewHolder.get(id);
if (childView == null) {
childView = convertView.findViewById(id);
childView.setTag(tag);
viewHolder.put(id, childView);
}
return (T) childView;
}
public List<NewInfoBean> getList() {
return list;
}
public void setList(List<NewInfoBean> list) {
this.list = list;
}
@Override
public void onSlide(View view, int status) {
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.slideview_tv_del:
int position = (Integer) v.getTag();
list.remove(position);
notifyDataSetChanged();
break;
default:
break;
}
}
}
比较关键的两个类：
自定义的ListView：SlideListView
package com.home.testslideview;
import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.widget.ListView;
public class SlideListView extends ListView {
private SlideView itemView;
public SlideListView(Context context) {
super(context);
}
public SlideListView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public void shrinkListItem(int position) {
View item = getChildAt(position);
if (item != null) {
try {
((SlideView) item).shrink();
} catch (ClassCastException e) {
e.printStackTrace();
}
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN: {
int x = (int) event.getX();
int y = (int) event.getY();
int position = pointToPosition(x, y);
if (position != INVALID_POSITION) {
NewInfoBean data = (NewInfoBean) getItemAtPosition(position);
itemView = data.slideView;
}
}
default:
break;
}
if (itemView != null) {
itemView.onRequireTouchEvent(event);
}
return super.onTouchEvent(event);
}
}
package com.home.testslideview;
import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.util.TypedValue;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.Scroller;
import com.home.textslideview.R;
public class SlideView extends LinearLayout {
private static final String TAG = SlideView.class.getSimpleName();
private Context mContext;
private Scroller mScroller;
private OnSlideListener mOnSlideListener;
private int mHolderWidth = 80;
private int mLastX = 0;
private int mLastY = 0;
private static final int TAN = 2;
private LayoutInflater inflater;
public interface OnSlideListener {
public static final int SLIDE_STATUS_OFF = 0;
public static final int SLIDE_STATUS_START_SCROLL = 1;
public static final int SLIDE_STATUS_ON = 2;
/**
* @param view
* current SlideView
* @param status
* SLIDE_STATUS_ON or SLIDE_STATUS_OFF
*/
public void onSlide(View view, int status);
}
public SlideView(Context context) {
super(context);
initView();
}
public SlideView(Context context, AttributeSet attrs) {
super(context, attrs);
initView();
}
private void initView() {
mContext = getContext();
if (inflater == null) {
inflater = LayoutInflater.from(mContext);
}
mScroller = new Scroller(mContext);
setOrientation(LinearLayout.HORIZONTAL);
View.inflate(mContext, R.layout.slide_view_merge, this);
mHolderWidth = Math.round(TypedValue.applyDimension(
TypedValue.COMPLEX_UNIT_DIP, mHolderWidth, getResources()
.getDisplayMetrics()));
}
public void setOnSlideListener(OnSlideListener onSlideListener) {
mOnSlideListener = onSlideListener;
}
public void shrink() {
if (getScrollX() != 0) {
this.smoothScrollTo(0, 0);
}
}
public void onRequireTouchEvent(MotionEvent event) {
int x = (int) event.getX();
int y = (int) event.getY();
int scrollX = getScrollX();
Log.d(TAG, "x=" + x + " y=" + y);
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN: {
if (!mScroller.isFinished()) {
mScroller.abortAnimation();
}
if (mOnSlideListener != null) {
mOnSlideListener.onSlide(this,
OnSlideListener.SLIDE_STATUS_START_SCROLL);
}
break;
}
case MotionEvent.ACTION_MOVE: {
int deltaX = x - mLastX;
int deltaY = y - mLastY;
if (Math.abs(deltaX) < Math.abs(deltaY) * TAN) {
break;
}
int newScrollX = scrollX - deltaX;
if (deltaX != 0) {
if (newScrollX < 0) {
newScrollX = 0;
} else if (newScrollX > mHolderWidth) {
newScrollX = mHolderWidth;
}
this.scrollTo(newScrollX, 0);
}
break;
}
case MotionEvent.ACTION_UP: {
int newScrollX = 0;
if (scrollX - mHolderWidth * 0.75 > 0) {
newScrollX = mHolderWidth;
}
this.smoothScrollTo(newScrollX, 0);
if (mOnSlideListener != null) {
mOnSlideListener.onSlide(this,
newScrollX == 0 ? OnSlideListener.SLIDE_STATUS_OFF
: OnSlideListener.SLIDE_STATUS_ON);
}
break;
}
default:
break;
}
mLastX = x;
mLastY = y;
}
private void smoothScrollTo(int destX, int destY) {
// 缓慢滚动到指定位置
int scrollX = getScrollX();
int delta = destX - scrollX;
mScroller.startScroll(scrollX, 0, delta, 0, Math.abs(delta) * 3);
invalidate();
}
@Override
public void computeScroll() {
if (mScroller.computeScrollOffset()) {
scrollTo(mScroller.getCurrX(), mScroller.getCurrY());
postInvalidate();
}
}
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<com.home.testslideview.SlideListView
android:id="@+id/main_lv"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:cacheColorHint="#00000000"
android:fadingEdge="none"
android:listSelector="#00000000"
android:scrollbars="none" />
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" >
<LinearLayout
android:id="@+id/slideview_layout_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center_vertical"
android:gravity="center_vertical"
android:orientation="horizontal" >
<TextView
android:id="@+id/slideview_tv_content"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="内容部分"/>
</LinearLayout>
<LinearLayout
android:id="@+id/view_layout_del"
android:layout_width="80dp"
android:layout_height="match_parent"
android:layout_gravity="center_vertical"
android:layout_toRightOf="@id/slideview_layout_content"
android:clickable="true"
android:gravity="center_vertical"
android:orientation="horizontal" >
<TextView
android:id="@+id/slideview_tv_del"
android:layout_width="80dp"
android:layout_height="match_parent"
android:layout_marginBottom="2dp"
android:gravity="center"
android:padding="15dp"
android:text="删除"/>
</LinearLayout>
</merge>版权声明：本文为博主原创文章，未经博主允许不得转载。
原文地址：http://blog.csdn.net/u010142437/article/details/46698369
