Android 实现ListView的滑动删除效果(转)
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<?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" > <LinearLayout android:id="@+id/view_content" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="horizontal" > </LinearLayout> <RelativeLayout android:id="@+id/holder" android:layout_width="120dp" android:layout_height="match_parent" android:clickable="true" android:background="@drawable/holder_bg"> <TextView android:id="@+id/delete" android:layout_width="wrap_content" android:layout_height="wrap_content" android:drawableLeft="@drawable/del_icon_normal" android:layout_centerInParent="true" android:gravity="center" android:textColor="@color/floralwhite" android:text="删除" /> </RelativeLayout> </merge>
上述xml文件中,所有的view都会被放在view_content中,而holder是放置诸如删除按钮之类的东西,我们的SlideView会加载这个布局。
再看SlideView.java:
/*** SlideView 继承自LinearLayout*/public class SlideView extends LinearLayout {private static final String TAG = "SlideView";private Context mContext;// 用来放置所有view的容器private LinearLayout mViewContent;// 用来放置内置view的容器,比如删除 按钮private RelativeLayout mHolder;// 弹性滑动对象,提供弹性滑动效果private Scroller mScroller;// 滑动回调接口,用来向上层通知滑动事件private OnSlideListener mOnSlideListener;// 内置容器的宽度 单位:dpprivate int mHolderWidth = 120;// 分别记录上次滑动的坐标private int mLastX = 0;private int mLastY = 0;// 用来控制滑动角度,仅当角度a满足如下条件才进行滑动:tan a = deltaX / deltaY > 2private static final int TAN = 2;public interface OnSlideListener {// SlideView的三种状态:开始滑动,打开,关闭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, SLIDE_STATUS_OFF or* SLIDE_STATUS_START_SCROLL*/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();// 初始化弹性滑动对象mScroller = new Scroller(mContext);// 设置其方向为横向setOrientation(LinearLayout.HORIZONTAL);// 将slide_view_merge加载进来View.inflate(mContext, R.layout.slide_view_merge, this);mViewContent = (LinearLayout) findViewById(R.id.view_content);mHolderWidth = Math.round(TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, mHolderWidth, getResources().getDisplayMetrics()));}// 设置按钮的内容,也可以设置图标啥的,我没写public void setButtonText(CharSequence text) {((TextView) findViewById(R.id.delete)).setText(text);}// 将view加入到ViewContent中public void setContentView(View view) {mViewContent.addView(view);}// 设置滑动回调public void setOnSlideListener(OnSlideListener onSlideListener) {mOnSlideListener = onSlideListener;}// 将当前状态置为关闭public void shrink() {if (getScrollX() != 0) {this.smoothScrollTo(0, 0);}}// 根据MotionEvent来进行滑动,这个方法的作用相当于onTouchEvent// 如果你不需要处理滑动冲突,可以直接重命名,照样能正常工作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) {// 滑动不满足条件,不做横向滑动break;}// 计算滑动终点是否合法,防止滑动越界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;// 这里做了下判断,当松开手的时候,会自动向两边滑动,具体向哪边滑,要看当前所处的位置if (scrollX - mHolderWidth * 0.75 > 0) {newScrollX = mHolderWidth;}// 慢慢滑向终点this.smoothScrollTo(newScrollX, 0);// 通知上层滑动事件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;// 以三倍时长滑向destX,效果就是慢慢滑动mScroller.startScroll(scrollX, 0, delta, 0, Math.abs(delta) * 3);invalidate();}@Overridepublic void computeScroll() {if (mScroller.computeScrollOffset()) {scrollTo(mScroller.getCurrX(), mScroller.getCurrY());postInvalidate();}}}上述代码做了很详细的说明,这就是滑动控件的完整代码,大家要明白的是:你所添加的view都是加在SlideView的子View : view_content中的,而不是直接加在SlideView中,只有这样我们才方便做滑动效果。
接着看ListView的代码:核心就是下面这一个方法,将点击事件发送给SlideView处理。
@Override public boolean onTouchEvent(MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: { int x = (int) event.getX(); int y = (int) event.getY(); //我们想知道当前点击了哪一行 int position = pointToPosition(x, y); Log.e(TAG, "postion=" + position); if (position != INVALID_POSITION) { //得到当前点击行的数据从而取出当前行的item。 //可能有人怀疑,为什么要这么干?为什么不用getChildAt(position)? //因为ListView会进行缓存,如果你不这么干,有些行的view你是得不到的。 MessageItem data = (MessageItem) getItemAtPosition(position); mFocusedItemView = data.slideView; Log.e(TAG, "FocusedItemView=" + mFocusedItemView); } } default: break; } //向当前点击的view发送滑动事件请求,其实就是向SlideView发请求 if (mFocusedItemView != null) { mFocusedItemView.onRequireTouchEvent(event); } return super.onTouchEvent(event); }最后看Activity的代码:
public class MainActivity extends Activity implements OnItemClickListener, OnClickListener, OnSlideListener { private static final String TAG = "MainActivity"; private ListViewCompat mListView; private List<MessageItem> mMessageItems = new ArrayList<MainActivity.MessageItem>(); private SlideAdapter mSlideAdapter; // 上次处于打开状态的SlideView private SlideView mLastSlideViewWithStatusOn; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); } private void initView() { mListView = (ListViewCompat) findViewById(R.id.list); for (int i = 0; i < 20; i++) { MessageItem item = new MessageItem(); if (i % 3 == 0) { item.iconRes = R.drawable.default_qq_avatar; item.title = "腾讯新闻"; item.msg = "青岛爆炸满月:大量鱼虾死亡"; item.time = "晚上18:18"; } else { item.iconRes = R.drawable.wechat_icon; item.title = "微信团队"; item.msg = "欢迎你使用微信"; item.time = "12月18日"; } mMessageItems.add(item); } mSlideAdapter = new SlideAdapter(); mListView.setAdapter(mSlideAdapter); mListView.setOnItemClickListener(this); } private class SlideAdapter extends BaseAdapter { private LayoutInflater mInflater; SlideAdapter() { super(); mInflater = getLayoutInflater(); } @Override public int getCount() { return mMessageItems.size(); } @Override public Object getItem(int position) { return mMessageItems.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder; SlideView slideView = (SlideView) convertView; if (slideView == null) { // 这里是我们的item View itemView = mInflater.inflate(R.layout.list_item, null); slideView = new SlideView(MainActivity.this); // 这里把item加入到slideView slideView.setContentView(itemView); // 下面是做一些数据缓存 holder = new ViewHolder(slideView); slideView.setOnSlideListener(MainActivity.this); slideView.setTag(holder); } else { holder = (ViewHolder) slideView.getTag(); } MessageItem item = mMessageItems.get(position); item.slideView = slideView; item.slideView.shrink(); holder.icon.setImageResource(item.iconRes); holder.title.setText(item.title); holder.msg.setText(item.msg); holder.time.setText(item.time); holder.deleteHolder.setOnClickListener(MainActivity.this); return slideView; } } public class MessageItem { public int iconRes; public String title; public String msg; public String time; public SlideView slideView; } private static class ViewHolder { public ImageView icon; public TextView title; public TextView msg; public TextView time; public ViewGroup deleteHolder; ViewHolder(View view) { icon = (ImageView) view.findViewById(R.id.icon); title = (TextView) view.findViewById(R.id.title); msg = (TextView) view.findViewById(R.id.msg); time = (TextView) view.findViewById(R.id.time); deleteHolder = (ViewGroup) view.findViewById(R.id.holder); } } @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { // 这里处理ListItem的点击事件 Log.e(TAG, "onItemClick position=" + position); } @Override public void onSlide(View view, int status) { // 如果当前存在已经打开的SlideView,那么将其关闭 if (mLastSlideViewWithStatusOn != null && mLastSlideViewWithStatusOn != view) { mLastSlideViewWithStatusOn.shrink(); } // 记录本次处于打开状态的view if (status == SLIDE_STATUS_ON) { mLastSlideViewWithStatusOn = (SlideView) view; } } @Override public void onClick(View v) { // 这里处理删除按钮的点击事件,可以删除对话 if (v.getId() == R.id.holder) { int position = mListView.getPositionForView(v); if (position != ListView.INVALID_POSITION) { mMessageItems.remove(position); mSlideAdapter.notifyDataSetChanged(); } Log.e(TAG, "onClick v=" + v); } } }
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