（第二阶段）冲刺五

Posted 2021-02-18 xlk3

徐利峰：

今日完成动态的展示，遇到的困难有：图片的动态展示问题，采用的解决办法是在item布局中加入linerlayout水平布局，然后在布局中自动生成imgview来展示多个图片

上代码：

DongTaiActivity(上传动态文字及照片)

package com.lh.std_everything.ui.home.hometype.dongtai;

import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import com.giftedcat.easylib.selector.MultiImageSelector;
import com.lh.std_everything.HttpUtil.HttpUtil;
import com.lh.std_everything.MainActivity;
import com.lh.std_everything.R;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import butterknife.BindView;
import butterknife.ButterKnife;
import butterknife.Unbinder;

public class DongTaiActivity extends AppCompatActivity implements View.OnClickListener{
    private static final int REQUEST_IMAGE = 2;
    private int maxNum = 9;
    private Button submit;
    private EditText text;
    Unbinder unbinder;
    ProgressBar progressBar;
    @BindView(R.id.rv_images)
    RecyclerView rvImages;
    private Handler handle;
    NineGridAdapter adapter;
    private int uploadnum=0;
    private int size;
    private String urlimg;
    private List<String> select;
    List<String> mSelect;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_dong_tai);
        unbinder = ButterKnife.bind(this);
        submit=findViewById(R.id.submit);
        text=findViewById(R.id.text);
        progressBar=findViewById(R.id.progressBar);
        mSelect = new ArrayList<>();
        submit.setOnClickListener(this);
        initView();
    }
    private void initView() {
        rvImages.setLayoutManager(new GridLayoutManager(this, 3));
        adapter = new NineGridAdapter(DongTaiActivity.this, mSelect, rvImages);
        adapter.setMaxSize(maxNum);
        rvImages.setAdapter(adapter);
        adapter.setOnAddPicturesListener(new OnAddPicturesListener() {
            @Override
            public void onAdd() {
                pickImage();
            }
        });
    }

    /*上传发动态的信息和照片到服务器
     */
    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.submit:
                final String daongtaitext=text.getText().toString();
                if(daongtaitext.isEmpty()){
                    Toast.makeText(DongTaiActivity.this, "动态内容不能为空", Toast.LENGTH_SHORT).show();
                    return;
                }
                String username= MainActivity.getUsername();
                handle = new Handler(new Handler.Callback() {
                    @Override
                    public boolean handleMessage(@NonNull Message msg) {
                        switch (msg.what) {
                            case 100:
                                if (uploadnum < size) {
                                    writeDongTaiImg(select.get(uploadnum));
                                } else {
                                    Toast.makeText(DongTaiActivity.this, "上传成功", Toast.LENGTH_SHORT).show();
                                    progressBar.setVisibility(View.GONE);
                                }
                                break;
                            case 404:
                                Toast.makeText(DongTaiActivity.this, "上传失败,您可以点击上传按钮重新上传", Toast.LENGTH_SHORT).show();
                                progressBar.setVisibility(View.GONE);
                                break;
                            default:
                                break;
                        }
                        return true;
                    }
                });
                /*将动态写到服务器*/
                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        String req="";
                        String context=text.getText().toString();
                        Log.i("输入的文本：", ""+context);
                        String url ="http://116.62.178.231:8080/BaiXiaoSheng/adddongtai?username="+ MainActivity.getUsername()+"&text="+context;
                        Log.i("url:", ""+url);
                        String msg=String.valueOf(HttpUtil.sendPost(url,req));
                        Log.d("文字上传：",msg);
                    }
                }).start();

                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        DongTaiActivity.this.runOnUiThread(new Runnable() {
                            @Override
                            public void run() {
                                progressBar.setVisibility(View.VISIBLE);
                                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                                    progressBar.setTooltipText("正在上传...");
                                }
                            }
                        });
                        /*将图片一张一张上传到服务器*/
                        String context=text.getText().toString();
                        urlimg = "http://116.62.178.231:8080/BaiXiaoSheng/downloadimg?username="+ MainActivity.getUsername()+"&text="+context;
                        handle.sendEmptyMessage(100);
                    }
                }).start();
        }
    }
    /*上传图片*/
    private void writeDongTaiImg(final String img) {
        new Thread(new Runnable() {
            @Override
            public void run() {
                Log.i("图片地址：", img);
                Map<String, File> fileMap = new HashMap<String, File>();
                fileMap.put("file", new File(img));
                String msg = null;
                try {
                    msg = HttpUtil.sendPostImg(urlimg, fileMap);
                } catch (IOException e) {
                    e.printStackTrace();
                }
                uploadnum++;
                Log.i("当前已上传照片数：", ""+uploadnum);
                final String finalMsg = msg;
                DongTaiActivity.this.runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        Log.e("服务器返回信息：", ""+finalMsg);
                        if (finalMsg.equals("yes")) {
                            Log.d("tag", finalMsg);
                            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                                progressBar.setTooltipText("图片进度:" + uploadnum + "/" + size);
                            }
                            handle.sendEmptyMessage(100);
                        } else {
                            uploadnum = 0;
                            handle.sendEmptyMessage(404);
                        }
                    }
                });
            }
        }).start();
    }


    /**
     * 选择添加图片
     */
    private void pickImage() {
        MultiImageSelector selector = MultiImageSelector.create(this);
        selector.showCamera(true);
        selector.count(maxNum);
        selector.multi();
        selector.origin(mSelect);
        selector.start(this, REQUEST_IMAGE);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == REQUEST_IMAGE) {
            if (resultCode == RESULT_OK) {
                select = data.getStringArrayListExtra(MultiImageSelector.EXTRA_RESULT);
                size=select.size()-1;
                Log.i("照片总数：", ""+size);
                mSelect.clear();
                mSelect.addAll(select);
                adapter.notifyDataSetChanged();
            }
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        unbinder.unbind();
    }

}

View Code

TrendsFragment（动态展示页面）

package com.lh.std_everything.ui.friends.type.trends;

import androidx.lifecycle.Observer;
import androidx.lifecycle.ViewModelProviders;

import android.os.Bundle;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import androidx.swiperefreshlayout.widget.SwipeRefreshLayout;

import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;

import com.lh.std_everything.HttpUtil.HttpUtil;
import com.lh.std_everything.R;
import com.lh.std_everything.ui.home.hometype.news.adapter.NewsAdapter;

import org.json.JSONArray;
import org.json.JSONException;

public class TrendsFragment extends Fragment {

    private TrendsViewModel mViewModel;
    private View view;
    private RecyclerView recyclerView;
    private TrendsAdapter trendsAdapter;
    private Handler handler;
    private SwipeRefreshLayout swipeRefreshLayout;
    public static TrendsFragment newInstance() {
        return new TrendsFragment();
    }

    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container,
                             @Nullable Bundle savedInstanceState) {
        view=inflater.inflate(R.layout.trends_fragment, container, false);
        recyclerView=view.findViewById(R.id.rec_dongtai);
        swipeRefreshLayout=view.findViewById(R.id.swiperefresh);
        return view;
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        mViewModel = ViewModelProviders.of(this).get(TrendsViewModel.class);
        // TODO: Use the ViewModel
        recyclerView.setLayoutManager(new LinearLayoutManager(requireActivity()));
        trendsAdapter = new TrendsAdapter();
        recyclerView.setAdapter(trendsAdapter);
        swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
                getThreadData();
                Toast.makeText(view.getContext(),"刷新成功",Toast.LENGTH_LONG).show();
            }
        });

        mViewModel.getJsonArrayMutableLiveDate().observe(requireActivity(), new Observer<JSONArray>() {
            @Override
            public void onChanged(JSONArray jsonArray) {
                if(swipeRefreshLayout.isRefreshing())
                    swipeRefreshLayout.setRefreshing(false);
                trendsAdapter.setJsonArray(jsonArray);
                trendsAdapter.notifyDataSetChanged();
            }
        });

        handler = new Handler(new Handler.Callback() {
            @Override
            public boolean handleMessage(@NonNull Message msg) {     //线程回调更新数据
                if (msg.what == 200)
                    mViewModel.getJsonArrayMutableLiveDate().setValue((JSONArray) msg.obj);
                return true;
            }
        });
        if (mViewModel.getJsonArrayMutableLiveDate().getValue() == null) {          //初始加载数据
            getThreadData();
        } else {
            trendsAdapter.setJsonArray(mViewModel.getJsonArrayMutableLiveDate().getValue());
            trendsAdapter.notifyDataSetChanged();
        }
    }

    private void getThreadData() {                     //线程封装网络请求
        new Thread(new Runnable() {
            @Override
            public void run() {
                String address = "http://116.62.178.231:8080/BaiXiaoSheng/findalldongtai";
                try {
                    final JSONArray json = new JSONArray(String.valueOf(HttpUtil.sendPost(address, "")));
                    Log.d("tag", json.toString());
                    Message msg = new Message();
                    msg.what = 200;
                    msg.obj = json;
                    handler.sendMessage(msg);
                } catch (JSONException e) {
                    e.printStackTrace();
                }
            }
        }).start();
    }
}

View Code

TrendsAdapter（动态适配器）

package com.lh.std_everything.ui.friends.type.trends;

import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import com.bumptech.glide.Glide;
import com.bumptech.glide.request.RequestOptions;
import com.lh.std_everything.R;
import com.lh.std_everything.ui.home.hometype.news.adapter.NewsAdapter;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

public class TrendsAdapter extends RecyclerView.Adapter<TrendsAdapter.MyViewHolder> {
    JSONArray jsonArray=new JSONArray();
    private View itemview;
    public void setJsonArray(JSONArray jsonArray) {
        this.jsonArray = jsonArray;
    }

    @NonNull
    @Override
    public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        LayoutInflater layoutInflater=LayoutInflater.from(parent.getContext());
        itemview=layoutInflater.inflate(R.layout.dongtai_item,parent,false);
        return new TrendsAdapter.MyViewHolder(itemview);
    }

    @Override
    public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
        JSONObject bean= null;
        try {
            bean = jsonArray.getJSONObject(position);
            holder.tv_name.setText(bean.getString("username"));
            holder.tv_content.setText(bean.getString("content"));
            holder.tv_time.setText(bean.getString("dtime"));
            String []urls=bean.getString("imgurl").split(",");
            String userimg=bean.getString("userimg");
            RequestOptions options = new RequestOptions()
                    .error(R.drawable.error)
                    .placeholder(R.drawable.loading);
            Glide.with(itemview)
                    .load(userimg)
                    .apply(options)
                    .circleCrop()
                    .into(holder.img_user);
            holder.lin_imgs.removeAllViews();
            if(urls.length!=0) {
                for(int i=0;i<urls.length;i++)
                {
                    if(!urls[i].equals(""))
                    {
                        ImageView item=new ImageView(itemview.getContext());
                        Log.i("url",urls[i]);
                        Glide.with(itemview)
                                .load(urls[i])
                                .apply(options)
                                .into(item);
                        Log.i("图片分割链接：", ""+urls[i]);
                        holder.lin_imgs.addView(item);
                    }
                }
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }

    @Override
    public int getItemCount() {
        return jsonArray.length();
    }


    static class MyViewHolder extends RecyclerView.ViewHolder{
        TextView tv_name,tv_time,tv_content;
        LinearLayout lin_imgs;
        ImageView img_user;
        public MyViewHolder(@NonNull View itemView) {
            super(itemView);
            img_user=itemView.findViewById(R.id.img_user);
            tv_name=itemView.findViewById(R.id.tv_name);
            tv_content=itemView.findViewById(R.id.tv_content);
            tv_time=itemView.findViewById(R.id.tv_time);
            lin_imgs=itemView.findViewById(R.id.lin_imgs);
        }
    }
}

View Code

服务器端：

dongtaidao（服务器存储一条动态信息，查找所有动态信息）

package Dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;

import Bean.Dongtai;
import Bean.News;
import Bean.User;
import util.DBUtil;

public class dongtaidao {
    public boolean adddongtai(String username,String text,String userimg,String dtime)
    {
            Connection con=null;
            PreparedStatement pstmt=null;
            ResultSet rs=null;
            try {
                con=DBUtil.getConn();
                String sql="insert into dongtai(username,content,imgurl,userimg,dtime) values(?,?,?,?,?)";
                pstmt=con.prepareStatement(sql);
                pstmt.setString(1, username);
                pstmt.setString(2, text);
                pstmt.setString(3, "");
                pstmt.setString(4, userimg);
                pstmt.setString(5, dtime);
                pstmt.executeUpdate();
                return true;
            }
            catch (SQLException e) {
                System.out.println("录入失败");
                e.printStackTrace();
            }
            finally {
                DBUtil.close(rs, pstmt, con);
            }
            return false;
    }
    public String findcurrenurl(String username,String text)
    {
        String sql="select * from dongtai where username=‘"+username+"‘and content=‘"+text+"‘";
        Connection con=null;
        Statement state=null;
        ResultSet rs=null;
        con=DBUtil.getConn();
        String urlString="";
        try {
            state=con.createStatement();
            rs=state.executeQuery(sql);
            while(rs.next())
            {
                urlString=rs.getString("imgurl");
                return urlString;
            }
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        DBUtil.close(rs, state, con);
        return "";
    }
    public boolean updateurls(String username,String text,String currenturl)
    {
        Connection con=null;
        PreparedStatement pstmt=null;
        ResultSet rs=null;
        try {
            con=DBUtil.getConn();
            String sql="update dongtai set imgurl=? where content=?";
            pstmt=con.prepareStatement(sql);
            pstmt.setString(1, currenturl);
            pstmt.setString(2, text);
            pstmt.executeUpdate();
            return true;
        }
        catch (SQLException e) {
            System.out.println("更新失败");
            e.printStackTrace();
        }
        finally {
            DBUtil.close(rs, pstmt, con);
        }
        return false;
    }
    public ArrayList<Dongtai> getall()
    {
        ArrayList<Dongtai> list=new ArrayList<>();
        String sql="select * from dongtai order by dtime desc";
        Connection con=null;
        Statement state=null;
        ResultSet rs=null;
        con=DBUtil.getConn();
        Dongtai bean=null;
        try {
            state=con.createStatement();
            rs=state.executeQuery(sql);
            while(rs.next())
            {
                String username=rs.getString("username");
                String content=rs.getString("content");
                String imgurl=rs.getString("imgurl");
                String userimg=rs.getString("userimg");
                String dtime=rs.getString("dtime");
                bean=new Dongtai(username, content, imgurl,userimg,dtime);
                list.add(bean);
            }
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        DBUtil.close(rs, state, con);
        return list;
    }
}

View Code

图片展示：