Android 分享功能的实现代码

android 分享功能的实现代码

一个activity中，取出设备上安装的所有支持分享动作的activity，在grid中显示。

实例代码：

/**
 * 分享activity
 */
public class nshareactivity extends appcompatactivity {
  public final static string extra_str_to_share="str_to_share1";

  private class sharedpkginfo{
    string pkgname;
    drawable icon;
    string appname;
    string activityclassname;
  }

  class vh extends recyclerview.viewholder {
    textview tv;
    imageview iv;
    public vh(view itemview) {
      super(itemview);

      itemview.setonclicklistener(new view.onclicklistener() {
        @override
        public void onclick(view view) {
          //点击了某个app的图标，用选择的app分享内容
          intent share = new intent(android.content.intent.action_send);
          share.settype("text/*");
          share.putextra(intent.extra_subject, "分享");
          share.putextra(intent.extra_text,nshareactivity.this.strtoshare);
          //share.putextra(intent.extra_stream, uri); // optional, just if you wanna share an image.
          sharedpkginfo pi = sharepkginfo.get(getadapterposition());
          share.setclassname(pi.pkgname,pi.activityclassname);
          //share.setpackage();
          startactivity(share);
        }
      });
    }
  }

  //获取支持供享的包的信息
  list<sharedpkginfo> sharepkginfo=new arraylist<>();

  //要分享出去的文本放在这里
  private string strtoshare=null;

  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);

    intent intent= this.getintent();
    strtoshare = intent.getstringextra(extra_str_to_share);

    getallsharepackages();

    //将可共享的app图标都放在一个gridview中
    recyclerview v=new recyclerview(this);
    v.setpadding(16,16,16,16);

    gridlayoutmanager lm=new gridlayoutmanager(this,4);
    v.setlayoutmanager(lm);
    v.setadapter(new recyclerview.adapter<vh>()
    {
      @override
      public vh oncreateviewholder(viewgroup parent, int viewtype) {
        //必须创建新的view holder
        linearlayout v=new linearlayout(nshareactivity.this);
        v.setpadding(8,8,8,8);
        vh vh=new vh(v);

        //先创建item view:上面一个图标，下面一个文本
        linearlayout.layoutparams lp=new linearlayout.layoutparams(
            linearlayout.layoutparams.match_parent,
            linearlayout.layoutparams.wrap_content);
        v.setorientation(linearlayout.vertical);
        v.setlayoutparams(lp);

        imageview imgv=new imageview(nshareactivity.this);
        imgv.setlayoutparams(new linearlayout.layoutparams(
            linearlayout.layoutparams.match_parent,
            120));
        textview tv=new textview(nshareactivity.this);

        tv.setgravity(gravity.center);
        v.addview(imgv);
        v.addview(tv);

        vh.tv=tv;
        vh.iv=imgv;

        return vh;
      }

      @override
      public void onbindviewholder(vh holder, int position) {
        //将视图与数据绑定
        sharedpkginfo spi=sharepkginfo.get(position);
        holder.tv.settext(spi.appname);
        holder.iv.setimagedrawable(spi.icon);
      }

      @override
      public int getitemcount() {
        return sharepkginfo.size();
      }
    });

    v.setbackgroundcolor(color.white);
    this.setcontentview(v);
  }

  //获取所有支持send action的包名和图片
  void getallsharepackages()
  {
    intent share = new intent(android.content.intent.action_send);
    //分析网站地址的话用这个：
    //intent.settype("text/plain"); //纯文本
    share.settype("text/*");
    // gets the list of intents that can be loaded.
    list<resolveinfo> resinfo = getpackagemanager().queryintentactivities(share, 0);
    if (!resinfo.isempty()) {
      for (resolveinfo info : resinfo) {
        sharedpkginfo spi = new sharedpkginfo();

        spi.pkgname = info.activityinfo.packagename;
        spi.icon = info.loadicon(getpackagemanager());
        spi.appname = info.loadlabel(getpackagemanager()).tostring();
        spi.activityclassname=info.activityinfo.name;

        sharepkginfo.add(spi);
        //log.w("shared",spi.pkgname+" , "+spi.appname+","+info.activityinfo.name);
      }
    }
  }

}

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