自定义Listview,向左滑动，右边刚好显示删除按钮：
public class SlideListView 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 SlideListView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public SlideListView(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();
}
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) / 2;
// 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;
// mLayoutParams.leftMargin = scroll*2;
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 / 2) {
mLayoutParams.leftMargin = -mDeleteBtnWidth;
// mLayoutParams.leftMargin = -mDeleteBtnWidth * 2;
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;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {//与scrollview嵌套需要重新计算高度
int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2,
MeasureSpec.AT_MOST);
super.onMeasure(widthMeasureSpec, expandSpec);
}
}
适配器：
public class ListViewSlideAdapter extends BaseAdapter {
private ArrayList<String> bulbList;
private Activity context;
private OnClickListenerEditOrDelete onClickListenerEditOrDelete;
public ListViewSlideAdapter(Activity context, ArrayList<String> bulbList) {
this.bulbList = bulbList;
this.context = context;
} public void setmNews(ArrayList<String> mNews) {
this.bulbList = mNews;
} @Override
public int getCount() {
return bulbList.size();
} @Override
public Object getItem(int position) {
return bulbList.get(position);
} @Override
public long getItemId(int position) {
return position;
} @Override
public View getView(final int position, View convertView, ViewGroup parent) {
final String str = bulbList.get(position);
ViewHolder viewHolder;
if (null == convertView) {
convertView = context.getLayoutInflater().inflate(R.layout.lay_list_collection_item, null);
viewHolder = new ViewHolder(convertView);
convertView.setTag(viewHolder);//store up viewHolder
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
viewHolder.tvDelete.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (onClickListenerEditOrDelete != null) {
onClickListenerEditOrDelete.OnClickListenerDelete(position);
}
}
}); if (!TextUtils.isEmpty(str.)) {
viewHolder.mTv.setText("" + str);
} return convertView;
} public void setOnClickListenerEditOrDelete(OnClickListenerEditOrDelete onClickListenerEditOrDelete1) {
this.onClickListenerEditOrDelete = onClickListenerEditOrDelete1;
} public interface OnClickListenerEditOrDelete {
void OnClickListenerDelete(int position);
} private class ViewHolder { TextView mTv; TextView tvDelete; ViewHolder(View view) { mTv = (TextView) view.findViewById(R.id.tv_title); tvDelete = (TextView) view.findViewById(R.id.tv_delete);
}
} } Item布局:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/white"
android:orientation="horizontal"> <TextView
android:id="@+id/tv_title"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:maxLength="@integer/maxlength" android:textColor="@color/black"
android:textSize="@dimen/text_16" /> <TextView
android:id="@+id/tv_delete"
android:layout_width="60dp"
android:layout_height="match_parent"
android:layout_marginLeft="@dimen/panding_5"
android:background="@color/color_26"
android:gravity="center"
android:text="删除"
android:textColor="@color/text_f7"
android:textSize="@dimen/text_16" /> </LinearLayout> 布局：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
android:background="@color/color_f4"
android:orientation="vertical"> <View
android:layout_width="match_parent"
android:layout_height="@dimen/margin_1"
android:background="@color/color_line_ae" /> <...PullToRefreshScrollView
android:id="@+id/pull_refresh_scrollview"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
app:ptrAnimationStyle="flip"
app:ptrMode="both"> <...SlideListView
android:id="@+id/listview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginLeft="@dimen/panding_5"
android:layout_marginRight="@dimen/panding_5"
android:divider="@null"
android:dividerHeight="0dp" /> </...PullToRefreshScrollView> <TextView
android:id="@+id/tv_notic"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center_horizontal"
android:paddingTop="20dp"
android:text="暂无收藏"
android:visibility="gone" />
例子：
mListCollectionAdapter = new ListViewSlideAdapter(this, mMessageReceive);
mListView.setAdapter(mListCollectionAdapter); mListView.setOnItemClickListener(this);
mListCollectionAdapter.setOnClickListenerEditOrDelete(new ListViewSlideAdapter.OnClickListenerEditOrDelete() {
@Override
public void OnClickListenerDelete(int position) {
//删除按钮点击事件
}
});