android 自定义可以侧滑操作的listview
第一 自定义SlideListView2 继承 Listview
最关键的是onTouchEvent 的处理
public class SlideListView2 extends ListView {
private int mScreenWidth; // 屏幕宽度
private int mDownX; // 按下点的x值
private int mDownY; // 按下点的y值
private int mDeleteBtnWidth;// 删除按钮的宽度
private boolean isDeleteShown; // 删除按钮是否正在显示
private ViewGroup mPointChild; // 当前处理的item
private LinearLayout.LayoutParams mLayoutParams; // 当前处理的item的LayoutParams
public SlideListView2(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public SlideListView2(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
// 获取屏幕宽度
WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
DisplayMetrics dm = new DisplayMetrics();
wm.getDefaultDisplay().getMetrics(dm);
mScreenWidth = dm.widthPixels;
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
performActionDown(ev);
break;
case MotionEvent.ACTION_MOVE:
return performActionMove(ev);
case MotionEvent.ACTION_UP:
performActionUp();
break;
}
return super.onTouchEvent(ev);
}
// 处理action_down事件
private void performActionDown(MotionEvent ev) {
if(isDeleteShown) {
turnToNormal();
}else {
mDownX = (int) ev.getX();
mDownY = (int) ev.getY();
// 获取当前点的item
mPointChild = (ViewGroup) getChildAt(pointToPosition(mDownX, mDownY)
- getFirstVisiblePosition());
// 获取删除按钮的宽度
mDeleteBtnWidth = mPointChild.getChildAt(1).getLayoutParams().width;
mLayoutParams = (LinearLayout.LayoutParams) mPointChild.getChildAt(0)
.getLayoutParams();
mLayoutParams.width = mScreenWidth;
mPointChild.getChildAt(0).setLayoutParams(mLayoutParams);
}
}
// 处理action_move事件
private boolean performActionMove(MotionEvent ev) {
int nowX = (int) ev.getX();
int nowY = (int) ev.getY();
if(Math.abs(nowX - mDownX) > Math.abs(nowY - mDownY)) {
// 如果向左滑动
if(nowX < mDownX) {
// 计算要偏移的距离
int scroll = (nowX - mDownX) / 3;
// 如果大于了删除按钮的宽度， 则最大为删除按钮的宽度
if(-scroll >= mDeleteBtnWidth) {
scroll = -mDeleteBtnWidth;
}
// 重新设置leftMargin
mLayoutParams.leftMargin = scroll*3;
mPointChild.getChildAt(0).setLayoutParams(mLayoutParams);
}
return true;
}
return super.onTouchEvent(ev);
}
// 处理action_up事件
private void performActionUp() {
// 偏移量大于button的一半，则显示button
// 否则恢复默认
if(-mLayoutParams.leftMargin >= mDeleteBtnWidth / 3) {
mLayoutParams.leftMargin = -mDeleteBtnWidth*3;
isDeleteShown = true;
}else {
turnToNormal();
}
mPointChild.getChildAt(0).setLayoutParams(mLayoutParams);
}
/**
* 变为正常状态
*/
public void turnToNormal() {
mLayoutParams.leftMargin = 0;
mPointChild.getChildAt(0).setLayoutParams(mLayoutParams);
isDeleteShown = false;
}
/**
* 当前是否可点击
* @return 是否可点击
*
*/
public boolean canClick() {
return !isDeleteShown;
}
}
这是自定义得侧滑效果
接下来 按照惯例 给listview 设置adapter 和 点击时间即可
* 第二 在adapter中 自定义一个点击接口和点击响应方法 并给按钮添加点击事件*
SlideListview 的 Adapter
public class SellServiceListAdapter extends BaseAdapter {
Context context;
List<> list;
OnClickListenerEditOrDelete onClickListenerEditOrDelete;
public SellServiceListAdapter(Context context, List<> list) {
this.context=context;
this.list=list;
}
@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(final int position, View convertView, ViewGroup parent) {
View view;
ViewHolder holder;
if (convertView==null){
view = View.inflate(context, R.layout.sellservicelist_item,null);
holder = new ViewHolder();
holder.selldelete = (TextView) view.findViewById(R.id.adsellservice_delete);
holder.selledit = (TextView) view.findViewById(R.id.adsellservice_edit);
holder.sellview = (TextView) view.findViewById(R.id.adsellservice_setview);
view.setTag(holder);
}else {
view = convertView;
holder = (ViewHolder) view.getTag();
}
设置点击
holder.sellview.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (onClickListenerEditOrDelete!=null){
onClickListenerEditOrDelete.OnClickListenersetView(position);
}
}
});
holder.selldelete.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (onClickListenerEditOrDelete!=null){
onClickListenerEditOrDelete.OnClickListenerDelete(position);
}
}
});
holder.selledit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (onClickListenerEditOrDelete!=null){
onClickListenerEditOrDelete.OnClickListenerEdit(position);
}
}
});
return view;
}
class ViewHolder{
TextView selldelete,selledit,sellview;
}
点击接口和响应方法
public interface OnClickListenerEditOrDelete{
void OnClickListenerEdit(int position);
void OnClickListenerDelete(int position);
void OnClickListenersetView(int position);
}
设置点击的方法
public void setOnClickListenerEditOrDelete(OnClickListenerEditOrDelete onClickListenerEditOrDelete1){
this.onClickListenerEditOrDelete=onClickListenerEditOrDelete1;
}
}
* 第三 在activity中初始化SlideListview 并添加点击方法*
SellServiceListAdapter adapter = new SellServiceListAdapter(getActivity(),list);
selllist.setAdapter(adapter);
adapter.setOnClickListenerEditOrDelete(new SellServiceListAdapter.OnClickListenerEditOrDelete() {
@Override
public void OnClickListenerEdit(int position) {
Toast.makeText(getActivity(), “编辑”, Toast.LENGTH_SHORT).show();
}
@Override
public void OnClickListenerDelete(int position) {
Toast.makeText(getActivity(), "删除", Toast.LENGTH_SHORT).show();
}
@Override
public void OnClickListenersetView(int position) {
Toast.makeText(getActivity(), "展示", Toast.LENGTH_SHORT).show();
}
});
也可以设置成为item 和 button 可同时点击
本文结束 欢迎留言或私信
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