判断网络状态、Xutils3.0图片框架·····--狸菇凉_

此文章使用了mvp模式

model层的utils里面有一个bean，是自己的封装类

presenter层的basepersenter类和Mainpersenter类

view类里面有activity包、adapter包、iview包和application包

在此bean类就不写了

Basepersenter类

public class Basepersenter <T extends IMvpview> {


    private T imvpview;


    public T getImvpview() {
        return imvpview;
    }

    public void setImvpview(T imvpview) {
        this.imvpview = imvpview;
    }
}

Mainpersenter类

public class Mainpersenter extends Basepersenter<Maininterface> {



    //获得缓存的数据
    public void getCacheData(int index){

        String url="http://www.93.gov.cn/93app/data.do?channelId=0&&startNum="+index;

        MyUtils.httpCacheGet(url, MainBean.class, new MyUtils.UtilsInterface() {
            @Override
            public <T> void CallBack(T mclass) {
                getImvpview().CallBack_Pulldata((MainBean) mclass);
            }
        });

    }

    //获得网络数据
    public void getData(int index) {

        String url="http://www.93.gov.cn/93app/data.do?channelId=0&&startNum="+index;

        MyUtils.httpGet(url, MainBean.class, new MyUtils.UtilsInterface() {
            @Override
            public <T> void CallBack(T mclass) {
                getImvpview().CallBack_Pulldata((MainBean) mclass);
            }
        });


    }


    public void refreshData(int index) {

        String url="http://www.93.gov.cn/93app/data.do?channelId=0&&startNum="+index;

        MyUtils.httpGet(url, MainBean.class, new MyUtils.UtilsInterface() {
            @Override
            public <T> void CallBack(T mclass) {
                getImvpview().CallBack_Freshdata((MainBean) mclass);
            }
        });


    }

    public void setImagview(ImageView imagview,String url) {

                MyUtils.setImag(imagview,url);

    }

}

view层的activity包里的Mainactivity类

public class MainActivity extends AppCompatActivity implements Maininterface,XListView.IXListViewListener {

    private XListView list_view;
    private Mainpersenter mainpersenter;
    private MyPullAdapter myPullAdapter;
    private int index=0;



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //进行网络判断，没有网络则跳转到设置

        ConnectivityManager systemService = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);
        NetworkInfo activeNetworkInfo = systemService.getActiveNetworkInfo();
        if (activeNetworkInfo!=null && activeNetworkInfo.isConnected()){

            Toast.makeText(this, "网络可用", Toast.LENGTH_SHORT).show();

        }else{

            AlertDialog.Builder builder = new AlertDialog.Builder(this);
            builder.setMessage("当前没有网络连接，点击确定前往设置");
            builder.setTitle("提醒");
            //确定按钮
            builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
                  @Override
                  public void onClick(DialogInterface dialog, int which) {
                      Intent intent=new Intent();
                      intent.setClassName("com.android.settings", "com.android.settings.Settings");
                      startActivity(intent);
                  }
              });
            //取消按钮
            builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {

                }
            });

            builder.show();
        }

        //初始化控件
        initView();
        //初始化数据
        initData();

    }

    private void initData() {
        //实例化v层对应的p层对象MainPersenter
        mainpersenter = new Mainpersenter();
        //将本层的引用传过去
        mainpersenter.setImvpview(this);
        //获得缓存的网络数据
        mainpersenter.getCacheData(0);
        //把p层对象传给适配器，从而可以获得图片数据
        myPullAdapter.setMainpersenter(mainpersenter);



    }


    private void initView() {
        list_view = (XListView) findViewById(R.id.list_view);

        //设置监听
        list_view.setXListViewListener(this);
        //设置可加载更多，默认就可一刷新
        list_view.setPullLoadEnable(true);
        //实例化适配器对象
        myPullAdapter = new MyPullAdapter(this);
        list_view.setAdapter(myPullAdapter);



    }



    //加载更多数据时的回掉方法
    @Override
    public void CallBack_Pulldata(MainBean mainbean) {
        List<MainBean.DataBean> data = mainbean.getData();
       //给适配器传递数据
        myPullAdapter.setData(data);
        //刷新适配器
        myPullAdapter.notifyDataSetChanged();
    }

    //刷新数据时的回掉方法
    @Override
    public void CallBack_Freshdata(MainBean mainbean) {

        List<MainBean.DataBean> data = mainbean.getData();
        myPullAdapter.refreshData(data);
        myPullAdapter.notifyDataSetChanged();
    }

    //xlistview监听的刷新
    @Override
    public void onRefresh() {
        //此变量是url的参数之一，就是请求的数据起始角标
        //每次返回的数据是19条，所以第一次的角标是0；第二次就是20，，，以此类推
        index=index+20;
        mainpersenter.refreshData(index);
        list_view.stopRefresh(true);
    }
    //xlistview监听的加载更多
    @Override
    public void onLoadMore() {
        //此变量是url的参数之一，就是请求的数据起始角标
        //每次返回的数据是19条，所以第一次的角标是0；第二次就是20，，，以此类推
        index=index+20;
        mainpersenter.getData(index);
        list_view.stopLoadMore();
    }


}

view层的adapter包里的MypullAdapter类

public class MyPullAdapter extends BaseAdapter {


    private final Context mcontext;
    private ArrayList<MainBean.DataBean> data =new ArrayList<>();
    private ViewHolder viewHolder;
    private Mainpersenter mainpersenter;

    public MyPullAdapter(Context mainActivity) {
        this.mcontext = mainActivity;

    }

    @Override
    public int getCount() {
        return data.size();
    }

    @Override
    public Object getItem(int position) {
        return data.get(position).getTITLE();
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        if (convertView == null) {

            convertView = View.inflate(mcontext, R.layout.list_item, null);
            viewHolder = new ViewHolder();
            viewHolder.textView= (TextView) convertView.findViewById(R.id.text_my);
            viewHolder.imageView= (ImageView) convertView.findViewById(R.id.imag_);
            convertView.setTag(viewHolder);


        }else{

            viewHolder= (ViewHolder) convertView.getTag();

        }

            viewHolder.textView.setText(getItem(position).toString());
            mainpersenter.setImagview(viewHolder.imageView,data.get(position).getIMAGEURL());

        return convertView;
    }

    //加载更多，直接将将新数据添加到集合中
    public void setData(List<MainBean.DataBean> data) {
        if (data != null) {
            this.data.addAll(data);
        }


    }
    //刷新数据，先将原先集合的数据清空，再将新数据添加到集合中
    public void refreshData(List<MainBean.DataBean> data) {
        if (data != null) {
            this.data.clear();
            this.data.addAll(data);
        }


    }

    //此方法就是把mainpersenter的引用传递过来
    public void setMainpersenter(Mainpersenter mainpersenter) {
        this.mainpersenter=mainpersenter;

    }

    private class ViewHolder{

        TextView textView;
        ImageView imageView;

    }





}

view层的iview包里的IMvpView类，，什么都没有

public interface IMvpview  {
}

view层的iview包里的Maininterface类，

public interface Maininterface  extends IMvpview{

        //加载更多时的回掉方法
        void CallBack_Pulldata(MainBean mainbean);
        //刷新数据的回掉方法
        void CallBack_Freshdata(MainBean mainbean);

}