Android 模仿QQ侧滑删除ListView功能示例

需求：

1、listview可以侧滑item，展示删除按钮，点击删除按钮，删除当前的item

2、在删除按钮展示时，点击隐藏删除按钮，不响应item的点击事件

3、在删除按钮隐藏时，点击item响应点击事件

根据以上需求在网络上查找响应的例子，也有仿qq侧滑代码，但不能满足2和3的要求，因此修改了一把，代码如下，共大家拍砖

第一步：重写listview

public class swipelistview extends listview {
  private final static string tag = "swipelistview";
  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 = false;  // 删除按钮是否正在显示
  private boolean isonclick = false;
  private viewgroup mpointchild;  // 当前处理的item
  private linearlayout.layoutparams mlayoutparams;  // 当前处理的item的layoutparams
  public swipelistview(context context, attributeset attrs) {
    this(context, attrs, 0);
  }
  public swipelistview(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:
        return performactionup(ev);
//        break;
    }
    return super.ontouchevent(ev);
  }
  // 处理action_down事件
  private void performactiondown(motionevent ev) {
//    log.e(tag,"performactiondown===="+isdeleteshown);
    if (isdeleteshown) {
      turntonormal();
    }
    isonclick = true;
    mdownx = (int) ev.getx();
    mdowny = (int) ev.gety();
    // 获取当前点的item
    int downposition = pointtoposition(mdownx, mdowny);
    int firstposition= getfirstvisibleposition();
    log.e(tag,"performactiondown====downposition:"+downposition+"==firstposition"+firstposition);
    if(downposition < 0) return;
    mpointchild = (viewgroup) getchildat(downposition-firstposition);
    // 获取删除按钮的宽度
    mdeletebtnwidth = mpointchild.getchildat(1).getlayoutparams().width;
    mlayoutparams = (linearlayout.layoutparams) mpointchild.getchildat(0)
        .getlayoutparams();
    // 为什么要重新设置layout_width 等于屏幕宽度
    // 因为match_parent时，不管你怎么滑，都不会显示删除按钮
    // why？ 因为match_parent时，viewgroup就不去布局剩下的view
    mlayoutparams.width = mscreenwidth;
    mpointchild.getchildat(0).setlayoutparams(mlayoutparams);
  }
  // 处理action_move事件
  private boolean performactionmove(motionevent ev) {
//    log.e(tag, "performactionmove====" + isdeleteshown);
    int nowx = (int) ev.getx();
    int nowy = (int) ev.gety();
    isonclick = false;
    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;
        mpointchild.getchildat(0).setlayoutparams(mlayoutparams);
      }
      return true;
    }
    return super.ontouchevent(ev);
  }
  // 处理action_up事件
  private boolean performactionup(motionevent ev) {
    boolean falg = false;
    if(isonclick && !isdeleteshown)
    {
      falg = true;
    }
    // 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;
      isdeleteshown = true;
    } else {
      turntonormal();
      isdeleteshown = false;
    }
    mpointchild.getchildat(0).setlayoutparams(mlayoutparams);
//    log.e(tag, "performactionup====" + isdeleteshown);
    if(falg)
    {
      return super.ontouchevent(ev);
    }
    return true;
  }
  /**
   * 变为正常状态
   */
  public void turntonormal() {
    mlayoutparams.leftmargin = 0;
    mpointchild.getchildat(0).setlayoutparams(mlayoutparams);
  }
  /**
   * 当前是否可点击
   *
   * @return 是否可点击
   */
  public boolean canclick() {
    return !isdeleteshown;
  }
}

第二步：适配器

class swipelistadapter extends baseadapter {
  @override
  public int getcount() {
    return mdata.size();
  }
  @override
  public object getitem(int position) {
    return mdata.get(position);
  }
  @override
  public long getitemid(int position) {
    return position;
  }
  @override
  public view getview(int position, view convertview, viewgroup parent) {
    viewholder holder = null;
    if (null == convertview) {
      holder = new viewholder();
      convertview = view.inflate(testlistviewactivity.this, r.layout.item_swipe_list, null);
      holder.tv = (linearlayout) convertview.findviewbyid(r.id.tv);
      holder.tvname = (textview) convertview.findviewbyid(r.id.tv_name);
      holder.delete = (textview) convertview.findviewbyid(r.id.delete);
      convertview.settag(holder);
    }
    else {
      holder = (viewholder) convertview.gettag();
    }
    holder.tvname.settext(mdata.get(position));
    final int pos = position;
    holder.delete.setonclicklistener(new view.onclicklistener() {
      @override
      public void onclick(view v) {
        mdata.remove(pos);
        notifydatasetchanged();
        mlistview.turntonormal();
      }
    });
    return convertview;
  }
}
static class viewholder {
  linearlayout tv;
  textview tvname;
  textview delete;
}

第三步：写一个testlistviewactivity

private swipelistview mlistview;
  private arraylist<string> mdata = new arraylist<string>() {
    {
      for (int i = 0; i < 20; i++) {
        add("hello world, hello android " + i);
      }
    }
  };
  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_test_list_view);
    toolbar toolbar = (toolbar) findviewbyid(r.id.toolbar);
    setsupportactionbar(toolbar);
    floatingactionbutton fab = (floatingactionbutton) findviewbyid(r.id.fab);
    fab.setonclicklistener(new view.onclicklistener() {
      @override
      public void onclick(view view) {
        snackbar.make(view, "replace with your own action", snackbar.length_long)
            .setaction("action", null).show();
      }
    });
    mlistview = (swipelistview) findviewbyid(r.id.list);
    mlistview.setadapter(new swipelistadapter());
//    mlistview.setonitemlongclicklistener(new adapterview.onitemlongclicklistener() {
//      @override
//      public boolean onitemlongclick(adapterview<?> parent, view view, int position, long id) {
//        toast.maketext(testlistviewactivity.this, mdata.get(position) + "被点击了",
//            toast.length_short).show();
//        return false;
//      }
//    });
    mlistview.setonitemclicklistener(new adapterview.onitemclicklistener() {
      @override
      public void onitemclick(adapterview<?> parent, view view, int position, long id) {
        log.e("swipelistview", "setonitemclicklistener====" + mlistview.canclick());
//        toast.maketext(testlistviewactivity.this, mdata.get(position) + "被点击了",
//            toast.length_short).show();
      }
    });
  }

第四步：布局文件

<?xml version="1.0" encoding="utf-8"?>
<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent"
  android:layout_height="match_parent" 
  app:layout_behavior="@string/appbar_scrolling_view_behavior"
  tools:showin="@layout/activity_test_list_view"
  tools:context="com.kimascend.ledappd1.activity.testlistviewactivity">
  <com.kimascend.ledappd1.view.swipelistview
    android:id="@+id/list"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:cachecolorhint="@android:color/transparent"
    android:listselector="@android:color/transparent"
    android:divider="@android:color/darker_gray"
    android:dividerheight="2dp">
  </com.kimascend.ledappd1.view.swipelistview>
</relativelayout>

第五步：item的布局文件

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:orientation="horizontal">
  <linearlayout
    android:id="@+id/tv"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@android:color/white"
    android:paddingbottom="20dp"
    android:paddingleft="10dp"
    android:paddingtop="20dp">
    <imageview
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:background="@drawable/group_name_rgb"
      android:id="@+id/imageview8" />
    <textview
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:textappearance="?android:attr/textappearancelarge"
      android:text="large text"
      android:layout_gravity="center_vertical"
      android:id="@+id/tv_name" />
  </linearlayout>
  <textview
    android:id="@+id/delete"
    android:layout_width="80dp"
    android:layout_height="match_parent"
    android:background="#ffff0000"
    android:gravity="center"
    android:paddingleft="20dp"
    android:paddingright="20dp"
    android:text="删除"
    android:textcolor="@android:color/white" />
</linearlayout>

重点注意：

int downposition = pointtoposition(mdownx, mdowny);

downposition 在使用过程中得到-1，导致后面方法调用异常！

以上所述是小编给大家介绍的android 模仿qq侧滑删除listview功能示例，希望对大家有所帮助