团队开发冲刺第八天（实现评论功能）

昨天在设计评论的UI，以及查阅网址看看如何添加评论

今天完成了评论的功能

遇到的问题：多线程并发的问题，导致第一次输出评论没有及时的显示在屏幕上，之后在进入该页面时，之前的数据会少一条

明天解决这个bug

明天要完成，点赞，收藏，关注等功能。

shownewsActivity.java

package com.example.newbsh.UI.home.hometype.news.shownews;

import androidx.annotation.NonNull;
import androidx.annotation.RequiresApi;
import androidx.appcompat.app.AppCompatActivity;

import android.annotation.SuppressLint;
import android.content.Context;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.text.method.ScrollingMovementMethod;
import android.util.Log;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.view.inputmethod.InputMethodManager;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;

import com.bumptech.glide.Glide;
import com.bumptech.glide.request.RequestOptions;
import com.example.newbsh.HttpUtil.HttpUtil;
import com.example.newbsh.MainActivity;
import com.example.newbsh.R;
import com.example.newbsh.UI.home.hometype.news.shownews.comment.BlogComment;

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

import java.lang.ref.WeakReference;
import java.sql.Driver;

public class ShowNewsActivity extends AppCompatActivity {
    TextView textViewtitle,textViewdoc,textViewdate;
    LinearLayout piclinearLayout,commentLayout;
    TextView msg;
    Button send;
    private String title;
    private String username= MainActivity.getUserName();
    private ShowBlogHandler blogHandler;
    String url;
    @RequiresApi(api = Build.VERSION_CODES.M)
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_show_news);
        blogHandler = new ShowBlogHandler(this);
        init();
        showComment();
    }



    private void init() {
        textViewtitle = findViewById(R.id.NewsTitle);
        textViewdoc = findViewById(R.id.Newsdoc);
        textViewdate = findViewById(R.id.Newsdate);
        piclinearLayout=findViewById(R.id.picturelinearlayout);
        commentLayout=findViewById(R.id.comment_layout);
        textViewdoc.setMovementMethod(new ScrollingMovementMethod());
        msg=findViewById(R.id.msg);
        send=findViewById(R.id.send);
        initdoc();
        send.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String comment=msg.getText().toString();
                if(comment.isEmpty()){
                    Toast.makeText(ShowNewsActivity.this, "发送内容不能为空", Toast.LENGTH_SHORT).show();
                    return;
                }
                writeComment(comment);      //开启线程
            }
        });

    }
    private void writeComment(String comment)
    {
        new Thread(new Runnable() {
            @Override
            public void run() {
                String reqdata="http://39.97.181.86/BaiXiaoSheng/sendnewscomment?username="+username+"&comment="+comment+"&title="+title;
                String json=String.valueOf(HttpUtil.sendPost(reqdata,""));
                Message msg=new Message();
                msg.what=1000;
                msg.obj=json;
                blogHandler.sendMessage(msg);
                Log.d("writecomment",json);
            }
        }).start();
    }
    private void showComment() {
        new Thread(new Runnable() {
            @Override
            public void run() {
                Log.d("data", "评论");
                String requrl="http://39.97.181.86/BaiXiaoSheng/findallcomments?title="+title;
                String json = String.valueOf(HttpUtil.sendPost(requrl, ""));
                Message msg = new Message();
                msg.what = 600;
                msg.obj = json;
                blogHandler.sendMessage(msg);
                Log.d("评论", json);
            }
        }).start();
    }

/*
加载新闻文章
 */
    private void initdoc() {
        Bundle bundle = getIntent().getExtras();
        /*
        获取图片的链接
         */
        url=bundle.getString("url");
        String []urls=url.split(" ");

        /*
        设置文章的内容
         */
        if (bundle != null) {
            title=bundle.getString("title");
            textViewtitle.setText(bundle.getString("title"));
            textViewdoc.setText(bundle.getString("doc"));
            textViewdate.setText("文章发布时间为："+bundle.getString("date"));
        } else {
            Log.i("bundle", "为空。。。。。。");
        }
        /*
        动态加载图片
         */

        RequestOptions options = new RequestOptions()
                .error(R.drawable.error)
                .placeholder(R.drawable.loading);
        for(int i=0;i<urls.length;i++)
        {
            ImageView imageView=new ImageView(this);
            Glide.with(this)
                    .load(urls[i])
                    .apply(options)
                    .into(imageView);
            LinearLayout.LayoutParams layout = new LinearLayout.LayoutParams(
                    LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
            layout.setMargins(0, 10, 0, 0);
            imageView.setLayoutParams(layout);
            piclinearLayout.addView(imageView);
        }
    }

    static class ShowBlogHandler extends Handler {     //防止内存泄漏
        private final ShowNewsActivity mcontext;

        ShowBlogHandler(ShowNewsActivity activity) {
            WeakReference<ShowNewsActivity> weakReference = new WeakReference<>(activity);
            mcontext = weakReference.get();
        }

        @SuppressLint("SetTextI18n")
        @Override
        public void handleMessage(@NonNull Message msg) {
            super.handleMessage(msg);

            switch (msg.what) {

                case 600:
                    try {
                        JSONArray comments = new JSONArray(msg.obj.toString());
                        Log.i("length:", ""+comments.length());
                        for (int i = 0; i < comments.length(); i++) {
                            JSONObject object = comments.getJSONObject(i);
                            BlogComment blogComment = new BlogComment(mcontext);
                            if (!object.isNull("imgurl")) {
                                Glide.with(mcontext)
                                        .load(object.getString("imgurl"))
                                        .circleCrop()
                                        .into(blogComment.getImageView());
                            }
                            blogComment.getName().setText(object.getString("username"));
                            blogComment.getComment().setText(object.getString("comment"));
                            blogComment.getDate().setText(object.getString("date"));
                            Log.i("次数:", ""+object.getString("comment"));
                            mcontext.commentLayout.addView(blogComment,0);

                        }
                    } catch (JSONException e) {
                        e.printStackTrace();
                    }
                    break;

                case 1000:
                    try {
                        JSONObject object=new JSONObject(msg.obj.toString());
                            BlogComment blogComment=new BlogComment(mcontext);
                            blogComment.getDate().setText(object.getString("date"));
                            blogComment.getComment().setText(object.getString("comment"));
                            blogComment.getName().setText(object.getString("username"));
                            if(!object.isNull("imgurl")){
                                if(object.getString("imgurl").length()>0)
                                    Glide.with(mcontext)
                                            .load(object.getString("imgurl"))
                                            .circleCrop()
                                            .into(blogComment.getImageView());
                            }
                            mcontext.commentLayout.addView(blogComment,0);
                            mcontext.msg.setText("");
                            mcontext.msg.clearFocus();
                            InputMethodManager imm= (InputMethodManager) mcontext.getSystemService(Context.INPUT_METHOD_SERVICE);   //键盘收缩
                            if (imm != null) {
                                imm.hideSoftInputFromWindow(mcontext.msg.getWindowToken(),0);
                            }
                            Toast toast = Toast.makeText(mcontext, "评论成功", Toast.LENGTH_SHORT);
                            toast.setGravity(Gravity.CENTER, 0, 0);
                            toast.show();
                    } catch (JSONException e) {
                        e.printStackTrace();
                    }
                    break;
                default:
                    break;
            }
        }
    }

}

Blogcomment.java

package com.example.newbsh.UI.home.hometype.news.shownews.comment;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;

import androidx.constraintlayout.widget.ConstraintLayout;

import com.example.newbsh.R;

public class BlogComment extends ConstraintLayout {
    private ImageView imageView;
    private TextView name;
    private TextView date;
    private TextView comment;
    public BlogComment(Context context) {
        super(context);
        LayoutInflater inflater= LayoutInflater.from(context);
        View view=inflater.inflate(R.layout.shownews_comment_layout,this);
        imageView=view.findViewById(R.id.comment_userimg);
        name=view.findViewById(R.id.comment_name);
        date=view.findViewById(R.id.comment_date);
        comment=view.findViewById(R.id.comment_comment);
    }

    public ImageView getImageView() {
        return imageView;
    }

    public TextView getName() {
        return name;
    }

    public TextView getDate() {
        return date;
    }

    public TextView getComment() {
        return comment;
    }
}