本文实例为大家分享了Android自定义左滑删除列表的具体代码，供大家参考，具体内容如下
1、布局文件view_left_slide_remove.xml
包含一个RelativeLayout和TextView，RelativeLayout是实际界面，TextView是删除按钮。
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<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="40dp"> <RelativeLayout android:id="@+id/view_content" android:layout_width="match_parent" android:layout_height="match_parent" /> <TextView android:id="@+id/tv_remove" android:layout_width="@dimen/left_slide_remove_width" android:layout_height="match_parent" android:layout_alignParentRight="true" android:gravity="center" android:text="删除" android:textSize="16sp" android:textColor="@color/white" android:background="#ffff4b30" android:visibility="gone"/></RelativeLayout> |
2、自定义Adapter
LeftSlideRemoveAdapter类实现了BaseAdapter。
在getView方法中引用了view_left_slide_remove布局，提供getSubView来导入真正的布局。
OnItemRemoveListener是删除监听器。
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public static abstract class LeftSlideRemoveAdapter extends BaseAdapter { protected Context mContext; private OnItemRemoveListener mListener; public LeftSlideRemoveAdapter(Context context) { this.mContext = context; } @Override public final View getView(final int position, View convertView, ViewGroup parent) { ViewHolder holder; if (convertView == null) { LayoutInflater inflater = LayoutInflater.from(mContext); convertView = inflater.inflate(R.layout.view_left_slide_remove, parent, false); holder = new ViewHolder(); holder.viewContent = (RelativeLayout) convertView.findViewById(R.id.view_content); holder.tvRmove = (TextView) convertView.findViewById(R.id.tv_remove); convertView.setTag(holder); // viewChild是实际的界面 holder.viewChild = getSubView(position, null, parent); holder.viewContent.addView(holder.viewChild); } else { holder = (ViewHolder) convertView.getTag(); getSubView(position, holder.viewChild, parent); } holder.tvRmove.setOnClickListener(new View.OnClickListener(){ @Override public void onClick(View v) { if (mListener != null) { mListener.onItemRemove(position); notifyDataSetChanged(); } } }); return convertView; } public abstract View getSubView(int position, View convertView, ViewGroup parent);} private static class ViewHolder { RelativeLayout viewContent; View viewChild; View tvRmove;} public static interface OnItemRemoveListener { public void onItemRemove(int position);} |
3、自定义左滑删除列表
在dispatchTouchEvent方法里面捕捉MotionEvent事件。
在onTouchEvent方法里面滑动界面。
VelocityTracker类记录手势。
Scroller类进行滑动操作。
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public class LeftSlideRemoveListView extends ListView { private final static int SNAP_VELOCITY = 600; private Scroller mScroller; private VelocityTracker mVelocityTracker; private int mTouchSlop; private boolean mIsSlide = false; private int mDelta = 0; private int mDownX; private int mDownY; private int mMaxDistence; private int mSlidePosition = INVALID_POSITION; private OnItemRemoveListener adapterListener; private OnItemRemoveListener mRemoveListener = new OnItemRemoveListener() { @Override public void onItemRemove(int position) { if (adapterListener != null) { adapterListener.onItemRemove(position); } clear(); mSlidePosition = INVALID_POSITION; } }; private LeftSlideRemoveAdapter mRemoveAdapter; private View mCurrentContentView, mCurrentRemoveView; public LeftSlideRemoveListView(Context context) { this(context, null); } public LeftSlideRemoveListView(Context context, AttributeSet attrs) { super(context, attrs); mScroller = new Scroller(context); mTouchSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop(); mMaxDistence = context.getResources().getDimensionPixelSize( R.dimen.left_slide_remove_width); } @Override public boolean dispatchTouchEvent(MotionEvent ev) { switch (ev.getAction()) { case MotionEvent.ACTION_DOWN: addVelocityTracker(ev); if (!mScroller.isFinished()) { return super.dispatchTouchEvent(ev); } // 起始位置，当前position mDownX = (int) ev.getX(); mDownY = (int) ev.getY(); int position = pointToPosition(mDownX, mDownY); if (position == mSlidePosition) break; mSlidePosition = position; if (mSlidePosition == INVALID_POSITION ) { return super.dispatchTouchEvent(ev); } // 恢复状态 clear(); // 获取当前界面 View childView = getChildAt(mSlidePosition - getFirstVisiblePosition()); mCurrentContentView = childView.findViewById(R.id.view_content); mCurrentRemoveView = childView.findViewById(R.id.tv_remove); break; case MotionEvent.ACTION_MOVE: if (mCurrentContentView == null) break; if (Math.abs(getScrollVelocity()) > SNAP_VELOCITY || (Math.abs(ev.getX() - mDownX) > mTouchSlop && Math.abs(ev.getY() - mDownY) < mTouchSlop)) { // 开始滑动 mIsSlide = true; } break; case MotionEvent.ACTION_UP: if (mCurrentContentView == null && mIsSlide) break; // 如果左滑小于4/5，按钮不显示 if (mDelta < mMaxDistence * 4 / 5) { mCurrentRemoveView.setVisibility(View.GONE); scrollRight(); } else if (mDelta < mMaxDistence) { scrollLeft(); } recycleVelocityTracker(); mIsSlide = false; break; } return super.dispatchTouchEvent(ev); } @Override public boolean onTouchEvent(MotionEvent ev) { if (mIsSlide && mSlidePosition != INVALID_POSITION) { final int action = ev.getAction(); int x = (int) ev.getX(); switch (action) { case MotionEvent.ACTION_MOVE: addVelocityTracker(ev); int deltaX = mDownX - x; mDownX = x; mDelta += deltaX; if (mDelta < 0) { mCurrentContentView.scrollTo(0, 0); mDelta = 0; mCurrentRemoveView.setVisibility(View.GONE); } else if (mDelta >= mMaxDistence) { mDelta = mMaxDistence; mCurrentContentView.scrollTo(mMaxDistence, 0); mCurrentRemoveView.setVisibility(View.VISIBLE); mCurrentRemoveView.setTranslationX(0); } else { mCurrentContentView.scrollBy(deltaX, 0); mCurrentRemoveView.setVisibility(View.VISIBLE); mCurrentRemoveView.setTranslationX(mMaxDistence - mDelta); } break; } return true; } return super.onTouchEvent(ev); } // 右滑 private void scrollRight() { final int delta = mDelta; mScroller.startScroll(delta, 0, -delta, 0, Math.abs(delta)); mDelta = 0; postInvalidate(); } // 左滑 private void scrollLeft() { final int delta = mMaxDistence - mDelta; mScroller.startScroll(mDelta, 0, delta, 0, Math.abs(delta)); mDelta = mMaxDistence; postInvalidate(); } @Override public void computeScroll() { if (mScroller.computeScrollOffset()) { mCurrentContentView.scrollTo(mScroller.getCurrX(), mScroller.getCurrY()); mCurrentRemoveView.setTranslationX(mMaxDistence - mScroller.getCurrX()); postInvalidate(); if (mScroller.isFinished()) { mCurrentContentView.scrollTo(mDelta, 0); mCurrentRemoveView.setTranslationX(0); } } } private void addVelocityTracker(MotionEvent event) { if (mVelocityTracker == null) { mVelocityTracker = VelocityTracker.obtain(); } mVelocityTracker.addMovement(event); } private int getScrollVelocity() { mVelocityTracker.computeCurrentVelocity(1000); int velocity = (int) mVelocityTracker.getXVelocity(); return velocity; } private void recycleVelocityTracker() { if (mVelocityTracker != null) { mVelocityTracker.recycle(); mVelocityTracker = null; } } private void clear() { if (mCurrentContentView != null) { mDelta = 0; mCurrentContentView.scrollTo(0, 0); mCurrentContentView = null; mCurrentRemoveView.setVisibility(View.GONE); mCurrentRemoveView = null; } } @Override public void setAdapter(ListAdapter adapter) { if (adapter instanceof LeftSlideRemoveAdapter) { super.setAdapter(adapter); mRemoveAdapter = (LeftSlideRemoveAdapter) adapter; mRemoveAdapter.mListener = mRemoveListener; } else { throw new IllegalArgumentException("Must be LeftSlideRemoveAdapter"); } } public void setOnItemRemoveListener(OnItemRemoveListener listener) { adapterListener = listener; }} |
4、测试例子
ContractAdapter继承LeftSlideRemoveAdapter类。
LeftSlideRemoveActivity中使用LeftSlideRemoveListView类。
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public class LeftSlideRemoveActivity extends Activity { private List<Map<String, String>> mContentList = new ArrayList<Map<String, String>>(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_left_slide_remove); Map<String, String> item = new HashMap<String, String>(); item.put("name", "Peter"); item.put("address", "ShangHai"); mContentList.add(item); item = new HashMap<String, String>(); item.put("name", "Lily"); item.put("address", "BeiJing"); mContentList.add(item); item = new HashMap<String, String>(); item.put("name", "Jack"); item.put("address", "GuangZhou"); mContentList.add(item); item = new HashMap<String, String>(); item.put("name", "Mike"); item.put("address", "ShengZhen"); mContentList.add(item); LeftSlideRemoveListView lv = (LeftSlideRemoveListView) findViewById(R.id.id_listview); lv.setAdapter(new ContractAdapter(this)); lv.setOnItemRemoveListener(new LeftSlideRemoveListView.OnItemRemoveListener() { @Override public void onItemRemove(int position) { mContentList.remove(position); } }); } private class ContractAdapter extends LeftSlideRemoveListView.LeftSlideRemoveAdapter { public ContractAdapter(Context context) { super(context); } @Override public int getCount() { return mContentList.size(); } @Override public Object getItem(int position) { return position; } @Override public long getItemId(int position) { return position; } @Override public View getSubView(int position, View convertView, ViewGroup parent) { ViewHolder holder; if (convertView == null) { convertView = getLayoutInflater().inflate( R.layout.listview_item_customdapter, parent, false); holder = new ViewHolder(); holder.tvName = (TextView) convertView.findViewById(R.id.tv_name); holder.tvAddress = (TextView) convertView.findViewById(R.id.tv_address); convertView.setTag(holder); } else { holder = (ViewHolder) convertView.getTag(); } Map<String, String> itemData = mContentList.get(position); holder.tvName.setText(itemData.get("name")); holder.tvAddress.setText(itemData.get("address")); return convertView; } } private class ViewHolder { TextView tvName; TextView tvAddress; } } |
显示如下
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/chennai1101/article/details/68935385
