android自定义View之滑动删除
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效果图
实现功能
1,可以向左滑动,右侧出现删除2,向左滑动如果删除出现一大半,松手打开删除,反之关闭删除3,应用场景 微信消息的删除功能实现原理
1,外面是一个ListView2,条目是一个自定义控件继承ViewGroup 1,左边一个TextView,右侧屏幕外也有一个TextView 2,所以继承ViewGroup实现步骤
1,创建一个SlideDeleteView类 1,构造方法要关联public class SlideDelete extends ViewGroup { private View leftView; private View rightView; private ViewDragHelper helper; //第一步关联构造方法 //第二步重写onMeasure和onLViewayout测量子View和布局子View public SlideDelete(Context context) { this(context,null); } public SlideDelete(Context context, AttributeSet attrs) { this(context, attrs,0); } public SlideDelete(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); helper = ViewDragHelper.create(this, callback); }}2,在布局文件中设置SlideDeleteView里面的子View SlideDeleteView height=80 TextView width:matchParent height:matchparent TextView <com.example.movedelete.SlideDelete android:id="@+id/container" android:layout_width="match_parent" android:layout_height="80dp"> <TextView android:id="@+id/content" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" android:background="#33000000" android:text="第0个条目" android:textColor="#fff" android:textSize="20sp" /> <TextView android:id="@+id/delete" android:layout_width="80dp" android:layout_height="match_parent" android:background="#f00" android:gravity="center" android:text="删除" android:textColor="#fff" android:textSize="20sp" /> </com.example.movedelete.SlideDelete>3,重写onMeasure,给子View进行测量 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { //对当前组合View的测量,不使用的话,也可以自己设置 measureChildren(widthMeasureSpec,heightMeasureSpec); super.onMeasure(widthMeasureSpec, heightMeasureSpec); }4,重写onLayout,给子View进行布局 注意事项: 要设置leftView,也要设置rightView,不要都写成leftView了 protected void onLayout(boolean changed, int l, int t, int r, int b) { //第一步获取里面子View leftView = getChildAt(0); rightView = getChildAt(1); //第二步给子View提供相应的布局 int leftL = 0; int leftT = 0; int leftR = leftView.getMeasuredWidth(); int leftB = leftView.getMeasuredHeight(); leftView.layout(leftL,leftT,leftR,leftB); //给rightView提供相应的布局 int rightL = leftView.getMeasuredWidth(); int rightT = 0; int rightR = leftView.getMeasuredWidth()+ rightView.getMeasuredWidth(); int rightB = rightView.getMeasuredHeight(); rightView.layout(rightL,rightT,rightR,rightB); }5,设置View的滑动事件onTouchEvent,实现滑动 1,因为要滑动,所以消费该事件返回true 2,使用ViewDragHelper来实现滑动效果 注意事项: 只能实现leftView的滑动,右侧RightView看不到所以滑动不了 只能给滑动的View设置监听,当滑动的时候,重新设置另一个View的布局跟着滑动 @Override public boolean onTouchEvent(MotionEvent event) { //1,要消费该事件,所以直接返回true //2,使用ViewDragHelper来实现滑动效果 helper.processTouchEvent(event); return true; }6,重写滑动事件的监听onViewPositionChanged解决只有lefView滑动的问题 1,重写的方法是在ViewDragHelper.Callback的子实现类中 2,要实现滑动事件,必须在tryCaptureView方法中返回true private ViewDragHelper.Callback callback = new ViewDragHelper.Callback() { //手势滑动时 @Override public boolean tryCaptureView(View child, int pointerId) { return true; } //监听控件移动状态 @Override public void onViewPositionChanged(View changedView, int left, int top, int dx, int dy) { //如果左边控件拖动,我们要让右边控件也重新布局 if(changedView == leftView){ rightView.layout(rightView.getLeft()+dx,0,rightView.getRight()+dx,rightView.getBottom()+dy); }else if(changedView == rightView){ leftView.layout(leftView.getLeft()+dx,0,leftView.getRight()+dx,leftView.getBottom()+dy); } }7,重写clampViewPositionHorizontal水平位置移动,解决左右越界问题 1,返回值为移动时左侧滑动的距离 2,如果滑动的控件是leftView时,解决越界 3,如果滑动的控件是rightView时,解决越界 public int clampViewPositionHorizontal(View child, int left, int dx) { //对左右越界问题的处理 if(child == leftView){ //处理两边的越界问题 if(left >= 0){ left = 0; }else if(left <= -rightView.getMeasuredWidth()){ left = -rightView.getMeasuredWidth(); } }else if(child == rightView){ //只处理右边的越界问题,因为左侧越界的时看不到该View if(left <= leftView.getMeasuredWidth()- rightView.getMeasuredWidth()){ left = leftView.getMeasuredWidth()- rightView.getMeasuredWidth(); }else if(left >= leftView.getMeasuredWidth()){ left = leftView.getMeasuredWidth(); } } return left; }8,手松开时重写onViewReleased方法,实现滑动手松开时,rightView是打开还是关闭 1,使用ViewDragHelper滑动时,要调用invalidate方法,回调computeScroll方法 2,重写computeScroll方法 1,先判断是否要继承滑动 2,使用兼容的invalidate方法来实现匀速滑动 @Override public void onViewReleased(View releasedChild, float xvel, float yvel) { //松开后,什么时候打开rightView,什么时候关闭leftView //临界值,rightView.getLeft() 和 屏幕的宽度-rightView.getWidth()/2 if(releasedChild == leftView){ if(rightView.getLeft() < getMeasuredWidth() - rightView.getMeasuredWidth()/2){ //使用ViewDragHelper来滑动 helper.smoothSlideViewTo(rightView,getMeasuredWidth()-rightView.getMeasuredWidth(),0); invalidate(); }else{ helper.smoothSlideViewTo(rightView,getMeasuredWidth(),0); invalidate(); } } } //需要重写computeScroll @Override public void computeScroll() { //判断是否要继承滑动 if(helper.continueSettling(true)){ //invalidate(); //兼容使用 ViewCompat.postInvalidateOnAnimation(this); } }9,实现删除rightView的点击删除事件 1,在listView的adapter中找到右侧的rightView 2,调用rightView的点击事件 3,删除该条目 1,删除集合中的数据 list.remove(position); 2,更新adapter notifyDataSetChanged(); 3,重新绘制整个条目 requestLayout(); //设置删除的点击事件 vh.delete.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //删除当前的数据 list.remove(position); notifyDataSetChanged(); //让父容器更新下 } }); vh.container.requestLayout();注意事项
1,在重写onLayout方法的时候,给rightView设置布局的时候,写成leftView一直出错2,在onTouchEvent中要返回true,因为要消费该事件3,在使用ViewDragHelper.Callback时,重写tryCaptureView时要返回true4,在onTouchEvent中,不使用scrollby或者scrollTo,而是使用ViewDragHelper工具类,不需要判断滑动的距离总结
1,首先该控件是自定义View,不是组合控件,因为组合的话rightView在屏幕右侧不能实现2,是自定义View中的继承ViewGroup,因为左侧leftView和右侧rightView都是TextView不需要自己画源码
SlideDelete的源码
package com.example.movedelete;import android.content.Context;import android.support.v4.view.ViewCompat;import android.support.v4.widget.ViewDragHelper;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;import android.view.ViewGroup;/** * Created by guixin on 2017/1/5. */public class SlideDelete extends ViewGroup { private View leftView; private View rightView; private ViewDragHelper helper; //第一步关联构造方法 //第二步重写onMeasure和onLViewayout测量子View和布局子View public SlideDelete(Context context) { this(context,null); } public SlideDelete(Context context, AttributeSet attrs) { this(context, attrs,0); } public SlideDelete(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); helper = ViewDragHelper.create(this, callback); } private ViewDragHelper.Callback callback = new ViewDragHelper.Callback() { //手势滑动时 @Override public boolean tryCaptureView(View child, int pointerId) { return true; } //拖动控件水平移动 @Override public int clampViewPositionHorizontal(View child, int left, int dx) { //对左右越界问题的处理 if(child == leftView){ //处理两边的越界问题 if(left >= 0){ left = 0; }else if(left <= -rightView.getMeasuredWidth()){ left = -rightView.getMeasuredWidth(); } }else if(child == rightView){ //只处理右边的越界问题,因为左侧越界的时看不到该View if(left <= leftView.getMeasuredWidth()- rightView.getMeasuredWidth()){ left = leftView.getMeasuredWidth()- rightView.getMeasuredWidth(); }else if(left >= leftView.getMeasuredWidth()){ left = leftView.getMeasuredWidth(); } } return left; } //监听控件移动状态 @Override public void onViewPositionChanged(View changedView, int left, int top, int dx, int dy) { //如果左边控件拖动,我们要让右边控件也重新布局 if(changedView == leftView){ rightView.layout(rightView.getLeft()+dx,0,rightView.getRight()+dx,rightView.getBottom()+dy); }else if(changedView == rightView){ leftView.layout(leftView.getLeft()+dx,0,leftView.getRight()+dx,leftView.getBottom()+dy); } } //解决滑动一半松手时,View的复位 /** * * @param releasedChild 松开的View * @param xvel * @param yvel */ @Override public void onViewReleased(View releasedChild, float xvel, float yvel) { //松开后,什么时候打开rightView,什么时候关闭leftView //临界值,rightView.getLeft() 和 屏幕的宽度-rightView.getWidth()/2 if(releasedChild == leftView){ if(rightView.getLeft() < getMeasuredWidth() - rightView.getMeasuredWidth()/2){ //使用ViewDragHelper来滑动 helper.smoothSlideViewTo(rightView,getMeasuredWidth()-rightView.getMeasuredWidth(),0); invalidate(); }else{ helper.smoothSlideViewTo(rightView,getMeasuredWidth(),0); invalidate(); } } } }; //需要重写computeScroll @Override public void computeScroll() { //判断是否要继承滑动 if(helper.continueSettling(true)){ //invalidate(); //兼容使用 ViewCompat.postInvalidateOnAnimation(this); } } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { //对当前组合View的测量,不使用的话,也可以自己设置 measureChildren(widthMeasureSpec,heightMeasureSpec); super.onMeasure(widthMeasureSpec, heightMeasureSpec); } @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { //第一步获取里面子View leftView = getChildAt(0); rightView = getChildAt(1); //第二步给子View提供相应的布局 int leftL = 0; int leftT = 0; int leftR = leftView.getMeasuredWidth(); int leftB = leftView.getMeasuredHeight(); leftView.layout(leftL,leftT,leftR,leftB); //给rightView提供相应的布局 int rightL = leftView.getMeasuredWidth(); int rightT = 0; int rightR = leftView.getMeasuredWidth()+ rightView.getMeasuredWidth(); int rightB = rightView.getMeasuredHeight(); rightView.layout(rightL,rightT,rightR,rightB); } //View的事件传递 @Override public boolean onTouchEvent(MotionEvent event) { //1,要消费该事件,所以直接返回true //2,使用ViewDragHelper来实现滑动效果 helper.processTouchEvent(event); return true; }}MainActivity.java源码
package com.example.movedelete;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.widget.ListView;import com.example.movedelete.adapter.SlideDeleteAdapter;import java.util.ArrayList;public class MainActivity extends AppCompatActivity { private ListView lv; private ArrayList<String> list; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //初始化视图 initView(); //初始化数据 initData(); //初始化事件 initEvent(); } //初始化视图 private void initView() { lv = (ListView) findViewById(R.id.lv); } //初始化数据 private void initData() { list = new ArrayList<>(); for (int i = 0; i < 20; i++) { list.add("第"+i+"项条目"); } } //初始化事件 private void initEvent() { SlideDeleteAdapter adapter = new SlideDeleteAdapter(list); lv.setAdapter(adapter); }}SlideDeleteAdapter.java源码
package com.example.movedelete.adapter;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.TextView;import com.example.movedelete.R;import com.example.movedelete.SlideDelete;import java.util.ArrayList;/** * Created by guixin on 2017/1/5. */public class SlideDeleteAdapter extends BaseAdapter{ private ArrayList<String> list; public SlideDeleteAdapter(ArrayList<String> list) { this.list = list; } @Override public int getCount() { return list == null ? 0 : list.size(); } @Override public String getItem(int position) { return list == null ? null : list.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(final int position, View convertView, ViewGroup parent) { ViewHolder vh; if(convertView == null){ convertView = View.inflate(parent.getContext(), R.layout.item_slide,null); vh = new ViewHolder(convertView); convertView.setTag(vh); }else{ vh = (ViewHolder) convertView.getTag(); } vh.content.setText(list.get(position)); //设置删除的点击事件 vh.delete.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //删除当前的数据 list.remove(position); notifyDataSetChanged(); //让父容器更新下 } }); vh.container.requestLayout(); return convertView; } class ViewHolder{ private TextView content; private TextView delete; private SlideDelete container; public ViewHolder(View v){ container = (SlideDelete) v.findViewById(R.id.container); content = (TextView) v.findViewById(R.id.content); delete = (TextView) v.findViewById(R.id.delete); } }}activity_main.xml
<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_main" android:layout_width="match_parent" android:layout_height="match_parent"> <ListView android:id="@+id/lv" android:layout_width="match_parent" android:layout_height="match_parent"> </ListView></RelativeLayout>item_slide.xml
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <com.example.movedelete.SlideDelete android:id="@+id/container" android:layout_width="match_parent" android:layout_height="80dp"> <TextView android:id="@+id/content" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" android:background="#33000000" android:text="第0个条目" android:textColor="#fff" android:textSize="20sp" /> <TextView android:id="@+id/delete" android:layout_width="80dp" android:layout_height="match_parent" android:background="#f00" android:gravity="center" android:text="删除" android:textColor="#fff" android:textSize="20sp" /> </com.example.movedelete.SlideDelete></LinearLayout> 0 0
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