Android仿QQ微信侧滑删除效果

public class dragdellistview extends listview {

  private boolean moveable=false;
  private boolean closed=true;
  private float mdownx,mdowny;
  private int mtouchposition,oldposition=-1;
  private dragdelitem mtouchview,oldview;
  private context context;
  public dragdellistview(context context) {
    super(context);
    init(context);
  }
  public dragdellistview(context context, attributeset attrs, int defstyle) {
    super(context, attrs, defstyle);
    init(context);
  }
  public dragdellistview(context context, attributeset attrs) {
    super(context, attrs);
    init(context);
  }
  private void init(context context) {
    this.context=context;
  }


  @override
  public boolean ontouchevent(motionevent ev) {
    switch (ev.getaction()) {
    case motionevent.action_down:
      mtouchposition = pointtoposition((int) ev.getx(), (int) ev.gety());
      mtouchview=(dragdelitem)getchildat(mtouchposition - getfirstvisibleposition());
      mdownx = ev.getx();
      mdowny=ev.gety();
      if(oldposition==mtouchposition ||closed)
      {
        moveable=true;
        mtouchview.mdownx =(int)mdownx;
      }else
      {
        moveable=false;
        if(oldview!=null)
        {
          oldview.smoothclosemenu();
        }
      }
      oldposition=mtouchposition;
      oldview=mtouchview;
      break;
    case motionevent.action_move:
      if (math.abs(mdownx-ev.getx()) < math.abs(mdowny-ev.gety()) * dp2px(2)) {
        break; 
      } 
      if (moveable) 
      {
        int dis = (int) (mtouchview.mdownx -ev.getx());
        if(mtouchview.state==mtouchview.state_open)
          dis+=mtouchview.mmenuview.getwidth();
        mtouchview.swipe(dis);
        ev.setaction(motionevent.action_cancel);
      }

      break;
    case motionevent.action_up:

      if (moveable) 
      {
        if ((mtouchview.mdownx -ev.getx()) > (mtouchview.mmenuview.getwidth()/2)) {
          // open
          mtouchview.smoothopenmenu();
          closed=false;
        } else {
          // close
          mtouchview.smoothclosemenu();
          closed=true;
        }
        ev.setaction(motionevent.action_cancel);
      }
      break;
    }
    return super.ontouchevent(ev);
  }

  private int dp2px(int dp) {
    return (int) typedvalue.applydimension(typedvalue.complex_unit_dip, dp,
        getcontext().getresources().getdisplaymetrics());
  }


}

public class dragdelitem extends linearlayout {

  public static final int state_close = 0;
  public static final int state_open = 1;
  private view mcontentview;
  public view mmenuview;
  public int mdownx;
  public int state = state_close;
  public boolean isfling;
  private int mbasex;
  private scroller scroll;

  public dragdelitem(view contentview, view menuview) {
    super(contentview.getcontext());
    scroll=new scroller(getcontext());
    mcontentview = contentview;
    mmenuview = menuview;
    init();
  }

  private dragdelitem(context context, attributeset attrs) {
    super(context, attrs);
  }

  private dragdelitem(context context) {
    super(context);
  }


  private void init() {
    setlayoutparams(new abslistview.layoutparams(layoutparams.match_parent,
        layoutparams.wrap_content));
    layoutparams contentparams = new layoutparams(
        layoutparams.wrap_content, layoutparams.wrap_content);
    mcontentview.setlayoutparams(contentparams);

    mmenuview.setlayoutparams(new layoutparams(layoutparams.wrap_content,
        layoutparams.wrap_content));

    addview(mcontentview);
    addview(mmenuview);

  }


  public void swipe(int dis) {
    if (dis > mmenuview.getwidth()) {
      dis = mmenuview.getwidth();
    }
    if (dis < 0) {
      dis = 0;
    }
    mcontentview.layout(-dis, mcontentview.gettop(),
        mcontentview.getwidth() - dis, getmeasuredheight());
    mmenuview.layout(mcontentview.getwidth() - dis, mmenuview.gettop(),
        mcontentview.getwidth() + mmenuview.getwidth() - dis,
        mmenuview.getbottom());
  }

  @override
  public void computescroll() {
    if (state == state_open) {
      if (scroll.computescrolloffset()) {
        swipe(scroll.getcurrx());
        postinvalidate();
      }
    } else {
      if (scroll.computescrolloffset()) {
        swipe(mbasex - scroll.getcurrx());
        postinvalidate();
      }
    }
  }

  public void smoothclosemenu() {
    state = state_close;
    mbasex = -mcontentview.getleft();
    scroll.startscroll(0, 0, mbasex, 0, 350);
    postinvalidate();
  }

  public void smoothopenmenu() {

    state = state_open;
    scroll.startscroll(-mcontentview.getleft(), 0,
        mmenuview.getwidth()/2, 0, 350);
    postinvalidate();
  }

  @override
  protected void onmeasure(int widthmeasurespec, int heightmeasurespec) {
    super.onmeasure(widthmeasurespec, heightmeasurespec);

    mmenuview.measure(measurespec.makemeasurespec(0,
        measurespec.unspecified), measurespec.makemeasurespec(
        getmeasuredheight(), measurespec.exactly));
    mcontentview.measure(measurespec.makemeasurespec(0,
        measurespec.unspecified), measurespec.makemeasurespec(
        getmeasuredheight(), measurespec.exactly));

  }

  @override
  protected void onlayout(boolean changed, int l, int t, int r, int b) {
    mcontentview.layout(0, 0, getmeasuredwidth(),
        mcontentview.getmeasuredheight());
    mmenuview.layout(getmeasuredwidth(), 0,
        getmeasuredwidth() + mmenuview.getmeasuredwidth(),
        mcontentview.getmeasuredheight());

  }

}

<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+id/rl_layout"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:background="#999999"
  android:padding="8dp" >
    <imageview
      android:id="@+id/iv_icon"
      android:layout_width="50dp"
      android:layout_height="50dp"
      android:src="@drawable/ic_launcher" />

    <textview
      android:id="@+id/tv_name"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_centervertical="true"
      android:layout_marginleft="10dp"
      android:layout_torightof="@+id/iv_icon"
      android:text="name"
      android:textcolor="@android:color/black"
      android:textsize="18sp" />
</relativelayout>

—swipemenu.xml代码

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="wrap_content"
  android:layout_height="match_parent"
  android:orientation="horizontal"
  >

  <textview
    android:id="@+id/tv_open"
    android:layout_width="90dp"
    android:layout_height="match_parent"
    android:gravity="center"
    android:background="#c2c2c2"
    android:text="置顶"
    android:textcolor="@android:color/white"
    android:textsize="18sp" />
  <textview
    android:id="@+id/tv_del"
    android:layout_width="90dp"
    android:layout_height="match_parent"
    android:gravity="center"
    android:background="#ff0000"
    android:text="删除"
    android:textcolor="@android:color/white"
    android:textsize="18sp" />

</linearlayout>

public class mainactivity extends activity {
  private list<applicationinfo> mapplist;
  private dragdellistview mlistview;
  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_list);

    mapplist = getpackagemanager().getinstalledapplications(0);
    mlistview = (dragdellistview) findviewbyid(r.id.listview);
    mlistview.setadapter(new appadapter(mapplist));
  }
  class appadapter extends baseadapter {
    private list<applicationinfo> mapplist;
    public appadapter(list<applicationinfo> applist)
    {
      mapplist=applist;
    }
    @override
    public int getcount() {
      return mapplist.size();
    }

    @override
    public applicationinfo getitem(int position) {
      return mapplist.get(position);
    }

    @override
    public long getitemid(int position) {
      return position;
    }

    @override
    public view getview(final int position, view convertview, viewgroup parent) {

      viewholder holder=null;
      view menuview=null;
      if (convertview == null) {
        convertview = view.inflate(getapplicationcontext(),
            r.layout.swipecontent, null);
        menuview = view.inflate(getapplicationcontext(),
            r.layout.swipemenu, null);
        convertview = new dragdelitem(convertview,menuview);
        holder=new viewholder(convertview);
      } else {
        holder = (viewholder) convertview.gettag();
      }
        applicationinfo item = getitem(position);
        holder.iv_icon.setimagedrawable(item.loadicon(getpackagemanager()));
        holder.tv_name.settext(item.loadlabel(getpackagemanager()));
        holder.tv_open.setonclicklistener(new view.onclicklistener() {
          @override
          public void onclick(view arg0) {
            toast.maketext(mainactivity.this, "置顶:"+position, toast.length_short).show();
          }
        });
        holder.tv_del.setonclicklistener(new view.onclicklistener() {

          @override
          public void onclick(view arg0) {
            toast.maketext(mainactivity.this, "删除:"+position, toast.length_short).show();
          }
        });
      return convertview;
    }

    class viewholder {
      imageview iv_icon;
      textview tv_name;
      textview tv_open,tv_del;
      relativelayout relativelayout;
      public viewholder(view view) {
        iv_icon = (imageview) view.findviewbyid(r.id.iv_icon);
        tv_name = (textview) view.findviewbyid(r.id.tv_name);
        tv_open=(textview)view.findviewbyid(r.id.tv_open);
        tv_del=(textview)view.findviewbyid(r.id.tv_del);
        relativelayout = (relativelayout) view.findviewbyid(r.id.rl_layout);
        //改变relativelayout宽度
        windowmanager wm = (windowmanager) getapplicationcontext().getsystemservice(context.window_service);
        int width = wm.getdefaultdisplay().getwidth();
        relativelayout.setminimumwidth(width-60);
        view.settag(this);
      }
    }
  }
}

<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  >

    <com.draglistview.dragdellistview
      android:id="@+id/listview"
      android:layout_width="match_parent"
      android:layout_height="match_parent" />

</relativelayout>