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最新推荐文章于 2025-04-16 19:53:11 发布

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最新推荐文章于 2025-04-16 19:53:11 发布

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本文链接：https://blog.youkuaiyun.com/weixin_44513400/article/details/88624162

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此博客展示了Android项目中MainActivity的代码，包含了导入的各类包，如android.os.Handler、android.support.v4.widget.SwipeRefreshLayout等，还定义了MainActivity类并实现了ShowView接口，代码涉及数据处理、视图展示等方面。

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package com.bw.com.zuoye0316.activity;

import android.os.Handler;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.widget.Toast;

import com.bw.com.zuoye0316.IsNetConnection;
import com.bw.com.zuoye0316.R;
import com.bw.com.zuoye0316.adapter.MyAdapter;
import com.bw.com.zuoye0316.adapter.OnLoadMoreListener;
import com.bw.com.zuoye0316.app.MyApplication;
import com.bw.com.zuoye0316.bean.DataBean;
import com.bw.com.zuoye0316.gen.DataBeanDao;
import com.bw.com.zuoye0316.presenter.ShowPresenter;
import com.bw.com.zuoye0316.view.ShowView;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity implements ShowView {

private RecyclerView rlv;
private ShowPresenter showPresenter;
int page=1;
private DataBeanDao db;
private SwipeRefreshLayout srl;
private Handler handler=new Handler();
private boolean a;
private List<DataBean> list;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    //找控件
    rlv = findViewById(R.id.rlv);
    srl = findViewById(R.id.srl);

    //布局管理器
    LinearLayoutManager layoutManager = new LinearLayoutManager(this);
    rlv.setLayoutManager(layoutManager);

    //实例化P
    showPresenter = new ShowPresenter(this);

showPresenter.attachView(this);

    //得到数据库
    db = MyApplication.getInstance().getDaoSession().getDataBeanDao();

    //判断网络状态
    a = IsNetConnection.getNetWork(this);
    if (a){
        db.deleteAll();
        //联系P
        showPresenter.relected(page);
    }else {
        List<DataBean> dataBeans = db.loadAll();
        if (dataBeans.size()!=0){
            MyAdapter myAdapter = new MyAdapter(this,dataBeans);
            rlv.setAdapter(myAdapter);
        }
    }

    //下拉
    srl.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
        @Override
        public void onRefresh() {
            if (a){
                page=1;
                showPresenter.relected(page);
            }else {
                Toast.makeText(MainActivity.this, "网络未连接", Toast.LENGTH_SHORT).show();
            }
            handler.postDelayed(new Runnable() {
                @Override
                public void run() {
                    srl.setRefreshing(false);
                }
            },2000);

        }
    });
    //上啦
    rlv.addOnScrollListener(new OnLoadMoreListener() {
        @Override
        protected void onLoading(int countItem, int lastItem) {
            if (a){
                page++;
                showPresenter.relected(page);
            }else {
                Toast.makeText(MainActivity.this, "没开网络", Toast.LENGTH_SHORT).show();
            }
            handler.postDelayed(new Runnable() {
                @Override
                public void run() {
                    srl.setRefreshing(false);
                }
            },2000);
        }
    });


}

@Override
public void show(List<DataBean> data) {
    Log.i("ttt",data.size()+"");
    //把数据存进数据库里
    if (page==1){
        for (int i=0;i<data.size();i++){
            DataBean dataBean = data.get(i);
            db.insert(dataBean);
        }
        list = new ArrayList<>();
    }
    list.addAll(data);

    //适配器
    MyAdapter myAdapter = new MyAdapter(this,list);
    rlv.setAdapter(myAdapter);
    rlv.scrollToPosition(myAdapter.getItemCount()-data.size()-1);

}


@Override
protected void onDestroy() {
    super.onDestroy();
    showPresenter.deachView();
}

}