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

{

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 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;

}

}

}

}

View Code

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;

}

}

View Code

相关阅读