Android组件之MainActivity实例

android之mainactivity实例

//mainactivity

private horizontalscrollview hs;
private viewpager viewpager;
private button button;
private linearlayout layout;
list<textview> list;
private arraylist<channelbean> channelbeans;
@override
protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_main);
    initview();
    initdata();
}

private void initdata() {
    list = new arraylist<>();
    channelbeans = new arraylist<>();
    channelbeans.add(new channelbean("头条",true));
    channelbeans.add(new channelbean("娱乐",true));
    channelbeans.add(new channelbean("重庆",true));
    channelbeans.add(new channelbean("杭州",true));
    channelbeans.add(new channelbean("河北",true));
    channelbeans.add(new channelbean("八卦",false));
    channelbeans.add(new channelbean("北京",false));
    channelbeans.add(new channelbean("科技",false));
    channelbeans.add(new channelbean("经贸",false));
    channelbeans.add(new channelbean("安徽",false));
    for(int i =0;i<channelbeans.size();i++){
        textview textview = new textview(this);
        textview.settext(channelbeans.get(i).getname()+"");
        textview.settextsize(15);
        textview.setid(i+1000);
        textview.setonclicklistener(new view.onclicklistener() {
            @override
            public void onclick(view v) {
                int  id = v.getid();
                viewpager.setcurrentitem(id-1000);
            }
        });
        if(i==0){
            textview.settextcolor(color.red);
        }else{
            textview.settextcolor(color.black);
        }
        linearlayout.layoutparams layoutparams = new linearlayout.layoutparams(viewpager.layoutparams.wrap_content,viewpager.layoutparams.wrap_content);
        layoutparams.setmargins(40,10,40,10);
        layout.addview(textview,layoutparams);
        list.add(textview);
    }
    viewpager.setadapter(new myadapter(getsupportfragmentmanager()));
    viewpager.setonpagechangelistener(new viewpager.onpagechangelistener() {
        @override
        public void onpagescrolled(int position, float positionoffset, int positionoffsetpixels) {
            for(int i=0;i<list.size();i++){
                if(position==i) {
                    list.get(i).settextcolor(color.red);
                } else {
                    list.get(i).settextcolor(color.black);
                }
            }
            textview textview = list.get(position);
            int width = textview.getwidth()+10;
            hs.scrollto(width*position,0);
        }

        @override
        public void onpageselected(int position) {

        }

        @override
        public void onpagescrollstatechanged(int state) {

        }
    });
    button.setonclicklistener(new view.onclicklistener() {
        @override
        public void onclick(view v) {
            channelactivity.startchannelactivity(mainactivity.this,channelbeans);
        }
    });

}
private void initview() {
    hs = findviewbyid(r.id.hs);
    layout = findviewbyid(r.id.linear);
    viewpager = findviewbyid(r.id.viewpager);
    button = findviewbyid(r.id.btn);
}

private class myadapter extends fragmentpageradapter {
    public myadapter(fragmentmanager supportfragmentmanager) {
        super(supportfragmentmanager);
    }

    @override
    public fragment getitem(int position) {
        return fragment01.getinstance(list.get(position).gettext().tostring());
    }

    @override
    public int getcount() {
        return list.size();
    }
}

//fragmeng
private view view;
private string path="https://www.yulin520.com/a2a/impressapi/news/mergelist?pagesize=15&page=";
private int page = 1;
private pulltorefreshlistview pull;
private xbanner banner;
private mybase base;
private httputils httputils = httputils.getinstance();
private list<bean.databean> list = new arraylist<>();
private list<string> imgs = new arraylist<>();
private handler handler = new handler();
public static fragment01 getinstance(string title) {
    fragment01 fragment01 = new fragment01();
    bundle bundle = new bundle();
    bundle.putstring("title",title);
    fragment01.setarguments(bundle);
   return fragment01;
}

@nullable
@override
public view oncreateview(@nonnull layoutinflater inflater, @nullable viewgroup container, @nullable bundle savedinstancestate) {
    view = inflater.inflate(r.layout.fragment01,container,false);
    banner = view.findviewbyid(r.id.banner);
    bundle a = getarguments();
    string title = a.getstring("title");
    textview textview = new textview(getactivity());
    textview.settext(title);
    imgs.add("https://img5.imgtn.bdimg.com/it/u=357293603,2414818182&fm=27&gp=0.jpg");
    imgs.add("https://www.cctv.com/program/dhc/20050207/images/100815_b2.jpg");
    imgs.add("https://ss0.bdstatic.com/70cfuhsh_q1ynxgkpowk1hf6hhy/it/u=3227877552,1311244730&fm=27&gp=0.jpg");

    banner.setdata(imgs,null);
    banner.setmadapter(new xbanner.xbanneradapter() {
        @override
        public void loadbanner(xbanner banner, view view, int position) {
            glide.with(getactivity()).load(imgs.get(position)).into((imageview)view);
        }
    });
    initview();
    initdata();
    return view;
}

private void initview() {
    pull = view.findviewbyid(r.id.pull);
    pull.setmode(pulltorefreshbase.mode.both);
    iloadinglayout loadinglayout = pull.getloadinglayoutproxy(true,false);
    loadinglayout.setpulllabel("下拉刷新");
    loadinglayout.setreleaselabel("正在刷新");
    loadinglayout.setreleaselabel("放开刷新");
    iloadinglayout layout = pull.getloadinglayoutproxy(false,true);
    layout.setpulllabel("上拉加载");
    layout.setrefreshinglabel("正在加载");
    layout.setrefreshinglabel("放开加载");
    pull.setonrefreshlistener(new pulltorefreshbase.onrefreshlistener2<listview>() {
        @override
        public void onpulldowntorefresh(pulltorefreshbase<listview> pulltorefreshbase) {
            page = 1;
            initdata();
            handler.postdelayed(new runnable() {
                @override
                public void run() {
                    pull.onrefreshcomplete();
                }
            },2000);
        }
        @override
        public void onpulluptorefresh(pulltorefreshbase<listview> pulltorefreshbase) {
            page = page+1;
            initdata();
            handler.postdelayed(new runnable() {
                @override
                public void run() {
                    pull.onrefreshcomplete();
                }
            },2000);
        }
    });
    base = new mybase(getactivity(),list);
    pull.setadapter(base);

}
private void initdata() {
    string url = path+page;
    httputils.getdata(url);
    httputils.sethttplicener(new httputils.httplicener() {
        @override
        public void getjsondata(string json) {
            gson gson = new gson();
            bean bean = gson.fromjson(json, bean.class);
            list<bean.databean> data = bean.getdata();
            if(page==1){
                list.clear();
            }
            list.addall(data);
            base.notifydatasetchanged();

        }
    });

}
//mybase
private context context;
private list<bean.databean> list;

public mybase(context context, list<bean.databean> list) {
    this.context = context;
    this.list = list;
}

@override
public int getcount() {
    return list.size();
}

@override
public object getitem(int position) {
    return null;
}

@override
public long getitemid(int position) {
    return 0;
}

@override
public view getview(int position, view convertview, viewgroup parent) {
    viewholder holder;
    if(convertview == null){
        convertview = view.inflate(context,r.layout.mybase,null);
        holder = new viewholder();
        holder.textview = convertview.findviewbyid(r.id.text);
        holder.imageview = convertview.findviewbyid(r.id.img);
        convertview.settag(holder);
    }else{
        holder = (viewholder) convertview.gettag();
    }
    holder.textview.settext(list.get(position).gettitle());
    imageloader.getinstance().displayimage(list.get(position).getimg(),holder.imageview,myaplicin.getoptions());
    return convertview;
}
class viewholder{
    textview textview;
    imageview imageview;
}

//httputils
private httplicener httplicener;
private static httputils httputils;
public static httputils getinstance() {
    if(httputils==null){
        httputils = new httputils();
    }
    return httputils;
}
public void getdata(string url){
    myasynctask asynctask = new myasynctask();
    asynctask.execute(url);
}
 class myasynctask extends asynctask<string,void,string> {
    string json = ""; 
     @override
     protected string doinbackground(string... strings) {

         try {
             url url = new url(strings[0]);
             httpurlconnection urlconnection = (httpurlconnection) url.openconnection();
             urlconnection.setrequestmethod("get");
             urlconnection.setconnecttimeout(5000);
             if(urlconnection.getresponsecode()==200){
                 inputstream inputstream = urlconnection.getinputstream();
                 json = streamtostring(inputstream);
                 
             }
         } catch (exception e) {
             e.printstacktrace();
         }


         return json;
     }

     @override
     protected void onpostexecute(string s) {
         super.onpostexecute(s);
         httplicener.getjsondata(s);
     }
 }

private string streamtostring(inputstream inputstream) throws ioexception {
    inputstreamreader inputstreamreader = new inputstreamreader(inputstream);
    bufferedreader reader = new bufferedreader(inputstreamreader);
    string s = "";
    stringbuilder builder = new stringbuilder();
    while ((s=reader.readline())!=null){
        builder.append(s);
    }
    reader.close();
    return builder.tostring();
}

public interface httplicener {
    void getjsondata(string json);
}

public void sethttplicener(httplicener httplicener) {
    this.httplicener = httplicener;
}
//myapplice

1.imageloader.getinstance().init(config);
2.return options;