自己实现一个右滑删除的ListView
参考了以下源码：https://github.com/baoyongzhang/SwipeMenuListView
实现的效果(顺便推荐一个视频转gif的网址：http://www.gif5.net/)
首先抛出几个问题：
1.如何根据我们的手势判定要左滑的position
2.滑动到什么程度让左滑的Menu显示出来
3.怎么处理item左滑与ListView的滑动的冲突
4.menu怎么添加
5.只能有一个是Open的状态，如果Item1是Open，这时候点击或者滑动Item2,应该使Item1关闭（拦截触摸事件，稍候详细添加）
首先，定义一个CustomSlideDeleteItemView，这个View的layout要重写，确定menu的摆放位置，具体见代码
package com.example.myapp.view; import android.content.Context; import android.content.res.TypedArray; import android.util.AttributeSet; import android.util.Log; import android.view.Gravity; import android.view.View; import android.view.ViewGroup; import android.widget.FrameLayout; import android.widget.LinearLayout; import android.widget.TextView; import com.example.myapp.R; import com.example.myapp.util.Methods; import java.util.ArrayList; import java.util.List; /** * Created by zyr * DATE: 16-3-19 * Time: 下午3:54 * Email: yanru.zhang@renren-inc.com */ public class CustomSlideDeleteItemView extends FrameLayout{ private Context mContext; private List<View> menuViews = new ArrayList<>(); private View contentView; private LinearLayout menuViewContainer; private int contentViewId; private int contentViewWidth,contentViewHeight,menuWidth,menuHeight; public boolean isMenuOpen() { return isMenuOpen; } private boolean isMenuOpen = false; public void setOnMenuClickListener(OnMenuClickListener onMenuClickListener) { this.onMenuClickListener = onMenuClickListener; } private OnMenuClickListener onMenuClickListener; public interface OnMenuClickListener{ void onMenuClick(int i,int counts); } public CustomSlideDeleteItemView(Context context) { this(context, null); } public CustomSlideDeleteItemView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public CustomSlideDeleteItemView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); mContext = context; menuWidth = Methods.computePixelsWithDensity(mContext,100); Log.d("zyr","menuWidth:" + menuWidth); TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.CustomSlideDeleteItemView); for(int i=0;i<typedArray.length();i++){ int attr = typedArray.getIndex(i); switch (attr){ case R.styleable.CustomSlideDeleteItemView_contentViewId: contentViewId = typedArray.getResourceId(R.styleable.CustomSlideDeleteItemView_contentViewId,0); break; } } if(contentViewId!=0){ contentView = findViewById(contentViewId); } menuViewContainer = new LinearLayout(mContext); menuViewContainer.setOrientation(LinearLayout.HORIZONTAL); ViewGroup.LayoutParams layoutParams = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.MATCH_PARENT); addView(menuViewContainer, layoutParams); } @Override protected void onLayout(boolean changed, int left, int top, int right, int bottom) { super.onLayout(changed, left, top, right, bottom); if(contentView!=null){ contentView.layout(0, 0, getMeasuredWidth(), getMeasuredHeight()); } layoutMenu(); } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { super.onSizeChanged(w, h, oldw, oldh); if(w!=oldw || h!=oldh){ contentViewHeight = menuHeight = h; contentViewWidth = w; // Log.d("zyr","contentViewWidth:" + contentViewWidth); } } public void addMenu(String s,int color){ TextView textView = new TextView(mContext); textView.setText(s); textView.setBackgroundColor(color); textView.setTextColor(getResources().getColor(R.color.white)); textView.setGravity(Gravity.CENTER); LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(menuWidth, ViewGroup.LayoutParams.MATCH_PARENT); menuViews.add(textView); menuViewContainer.addView(textView, layoutParams); invalidate(); for(int i=0;i<menuViews.size();i++){ final int position = i; View view = menuViews.get(i); view.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { if(onMenuClickListener!=null){ onMenuClickListener.onMenuClick(position,menuViews.size()); scrollBack(); } } }); } } public void clearAllMenu(){ menuViews.clear(); menuViewContainer.removeAllViews(); invalidate(); } private void layoutMenu() { menuViewContainer.layout(contentViewWidth, 0, contentViewWidth + menuWidth * menuViews.size(), contentViewHeight); } public void scroll(int deltaX,int lastDeltaX) { if(deltaX < 0){ Log.d("zyr","deltaX:" + deltaX); Log.e("zyr","menuWidth * menuViews.size():" + menuWidth * menuViews.size()); if(Math.abs(deltaX) > menuWidth * menuViews.size() ){ scrollTo(menuWidth * menuViews.size(), 0); isMenuOpen = true; }else{ scrollBy(-lastDeltaX, 0); } }else{ if(isMenuOpen()){ Log.d("zyr","deltaX:" + deltaX); Log.e("zyr", "menuWidth * menuViews.size():" + menuWidth * menuViews.size()); if(Math.abs(deltaX) > menuWidth * menuViews.size()){ scrollTo(0,0); isMenuOpen = false; }else{ scrollBy(-lastDeltaX, 0); } } } } public void autoScroll(int deltaX){ if(deltaX < 0){ if(Math.abs(deltaX) < menuWidth){ scrollTo(0, 0); isMenuOpen = false; }else{ scrollTo(menuWidth * menuViews.size(), 0); isMenuOpen = true; } }else{ if(isMenuOpen()){ if(Math.abs(deltaX) < menuWidth){ scrollTo(menuWidth * menuViews.size(), 0); isMenuOpen = true; }else{ scrollTo(0,0); isMenuOpen = false; } } } } public void scrollBack(){ scrollTo(0,0); isMenuOpen = false; } }
在attr文件中定义
<declare-styleable name="CustomSlideDeleteItemView">
<attr name="contentViewId" format="integer"/>
</declare-styleable>
然后定义我们的CustomSlideDeleteListView
package com.example.myapp.view; import android.content.Context; import android.content.res.TypedArray; import android.graphics.Color; import android.graphics.drawable.ColorDrawable; import android.util.AttributeSet; import android.view.MotionEvent; import android.widget.ListView; import com.example.myapp.R; /** * Created by zyr * DATE: 16-3-18 * Time: 下午5:42 * Email: yanru.zhang@renren-inc.com */ public class CustomSlideDeleteListView extends ListView { private Context mContext; private CustomSlideDeleteItemView mCurrentView; private int currentItemId; private int downX,downY,moveX,moveY,deltaX,deltaY,upX,upY,lastX,lastDeltaX; public final static int MIN_SCROLL_DIS = 100; public CustomSlideDeleteListView(Context context) { this(context, null); } public CustomSlideDeleteListView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public CustomSlideDeleteListView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); mContext = context; setSelector(new ColorDrawable(Color.TRANSPARENT)); TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.CustomSlideDeleteListView); for(int i=0;i<typedArray.length();i++){ int attr = typedArray.getIndex(i); switch (attr){ case R.styleable.CustomSlideDeleteListView_rightViewId: break; } } } @Override public boolean onTouchEvent(MotionEvent ev) { switch (ev.getAction()){ case MotionEvent.ACTION_DOWN: lastX = downX = (int) ev.getX(); downY = (int) ev.getY(); currentItemId = pointToPosition(downX, downY); mCurrentView = (CustomSlideDeleteItemView)getChildAt(currentItemId - getFirstVisiblePosition()); // Log.e("zyr","currentItemId:" + currentItemId); break; case MotionEvent.ACTION_MOVE: /**还要区分上下滑动listview的时候**/ moveX = (int) ev.getX(); moveY = (int) ev.getY(); deltaX = moveX - downX; deltaY = moveY - downY; if(Math.abs(deltaX) > Math.abs(deltaY)){ lastDeltaX = moveX - lastX; lastX = moveX; // Log.d("zyr","deltaX:" + deltaX); // Log.e("zyr","canShowRightView " + canShowRightView); if(Math.abs(deltaX) > MIN_SCROLL_DIS && mCurrentView!=null){ mCurrentView.scroll(deltaX,lastDeltaX); return true; } } break; case MotionEvent.ACTION_UP: case MotionEvent.ACTION_CANCEL: upX = (int)ev.getX(); upY = (int)ev.getY(); if(mCurrentView!=null && Math.abs(upX-downX) > MIN_SCROLL_DIS){ mCurrentView.autoScroll(upX-downX); } break; } return super.onTouchEvent(ev); } }
最后需要定义我们的Adapter
package com.example.myapp.adapter; import android.content.Context; import android.graphics.Color; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.Filter; import android.widget.Filterable; import android.widget.TextView; import android.widget.Toast; import com.example.myapp.R; import com.example.myapp.view.CustomSlideDeleteItemView; import java.util.ArrayList; import java.util.List; /** * Created by zyr * DATE: 15-11-26 * Time: 下午2:52 * Email: yanru.zhang@renren-inc.com */ public class CustomSlideDeleteListViewAdapter extends BaseAdapter implements Filterable{ public List<String> arrayList = new ArrayList<String>(); private Context context; private MyFilter mFilter; public CustomSlideDeleteListViewAdapter(Context context){ this.context = context; } public CustomSlideDeleteListViewAdapter(Context context, List<String> arrayList){ this.context = context; this.arrayList = new ArrayList<String>(arrayList); } public void setData(List<String> array){ if(array ==null){ return; } arrayList = new ArrayList<String>(array); notifyDataSetChanged(); } @Override public int getCount() { return arrayList.size(); } @Override public Object getItem(int position) { return arrayList.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(final int position, View convertView, ViewGroup parent) { ViewHolder viewHolder = null; if(convertView ==null){ convertView = LayoutInflater.from(context).inflate(R.layout.list_view_item,null); viewHolder = new ViewHolder(convertView); convertView.setTag(viewHolder); }else{ viewHolder = (ViewHolder)convertView.getTag(); } viewHolder.itemView.clearAllMenu(); viewHolder.itemView.addMenu("Delete", Color.RED); viewHolder.itemView.addMenu("Open", Color.BLUE); viewHolder.itemView.scrollBack(); viewHolder.textView.setText(arrayList.get(position)); viewHolder.itemView.setOnMenuClickListener(new CustomSlideDeleteItemView.OnMenuClickListener() { @Override public void onMenuClick(int i, int counts) { switch (i){ case 0: arrayList.remove(position); notifyDataSetChanged(); break; case 1: break; } } }); return convertView; } @Override public Filter getFilter() { if (mFilter == null) { mFilter = new MyFilter(); } return mFilter; } class MyFilter extends Filter { @Override protected FilterResults performFiltering(CharSequence constraint) { FilterResults results = new FilterResults(); if (arrayList == null) { arrayList = new ArrayList<String>(); } results.values = arrayList; results.count = arrayList.size(); return results; } @Override protected void publishResults(CharSequence constraint, FilterResults results) { if (results.count > 0) { notifyDataSetChanged(); } else { notifyDataSetInvalidated(); } } } class ViewHolder{ CustomSlideDeleteItemView itemView; TextView textView; public ViewHolder(View view){ itemView = (CustomSlideDeleteItemView)view; textView = (TextView)view.findViewById(R.id.list_view_text); } } }
adapter引用的xml文件
<?xml version="1.0" encoding="utf-8"?> <com.example.myapp.view.CustomSlideDeleteItemView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" xmlns:app="http://schemas.android.com/apk/res-auto" android:background="@drawable/common_listview_bg" app:contentViewId="@+id/list_view_text"> <TextView android:id="@+id/list_view_text" android:layout_width="match_parent" android:layout_height="50dp" android:gravity="center" android:textColor="@color/primary" android:textStyle="bold" android:paddingLeft="20dp" /> </com.example.myapp.view.CustomSlideDeleteItemView>
在Activity中引用
customSlideDeleteListView = (CustomSlideDeleteListView) findViewById(R.id.custom_slid_delete_list_view); for(int i=0;i<100;i++){ stringList.add("zyr" + i); } customSlideDeleteListViewAdapter = new CustomSlideDeleteListViewAdapter(this,stringList); customSlideDeleteListView.setAdapter(customSlideDeleteListViewAdapter);
