昨天的bug今天已经完成，原因是布局的问题，导致评论数据部分没有显示出来。解决的办法是：用滑动布局将照片和评论数据包裹起来，之后设置总体的布局与底部评论栏间隔开。这样就不会使评论框挡住评论的数据。
遇到的困难有，在使用handler+Thread，子线程不能直接修改UI，需要创建handler对象，然后在子线程中发消息，然后在handler中捕获所需消息，实现响应。学会这个后，接下来就好设计收藏，点赞，关注这些功能，同时在逻辑思考上要设置图标的颜色变化，在这里我学习了一个“如何判断当前的资源文件是哪一个”，第二个比较繁琐的地方就是“做web服务器的访问数据请求”，比较容易。
不得不说这个handler+Thread线程真棒
明天的任务：实现全局搜索（含搜索记录）
代码：Android
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.inputmethod.InputMethodManager; import android.widget.Button; import android.widget.ImageView; import android.widget.LinearLayout; 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.util.Objects; public class ShowNewsActivity extends AppCompatActivity implements View.OnClickListener { TextView textViewtitle,textViewdoc,textViewdate,textViewbkauthorname; LinearLayout piclinearLayout,commentLayout; TextView msg; Button send; private ImageView support,collect,bkphoto; private Button attention; private String title,authorname; 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();//初始化文章的内容 isAttention();//判断是否关注 isCollect();//判断是否收藏 isSupport();//判断是否点赞 showComment();//展示评论 } 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()); support=findViewById(R.id.support); collect=findViewById(R.id.collect); attention=findViewById(R.id.attention); msg=findViewById(R.id.msg); send=findViewById(R.id.send); bkphoto=findViewById(R.id.userphoto); textViewbkauthorname=findViewById(R.id.bkname); initdoc(); support.setOnClickListener(this); collect.setOnClickListener(this); attention.setOnClickListener(this); 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 } }); } public void onClick(View v) { switch (v.getId()) { case R.id.attention: attentionAction(); break; case R.id.collect: collectAction(); break; case R.id.support: supportAction(); break; default: break; } } private void isSupport() { //是否点赞 new Thread(new Runnable() { @Override public void run() { Log.d("data", "点赞"); String requrl = "http://39.97.181.86/BaiXiaoSheng/findsupport?username=" + username + "&title=" + title + ""; boolean isthumb = Boolean.parseBoolean(String.valueOf(HttpUtil.sendPost(requrl, ""))); Message msg = new Message(); msg.what = 300; msg.obj = isthumb; blogHandler.sendMessage(msg); Log.d("点赞", String.valueOf(isthumb)); } }).start(); } private void isCollect() { //是否收藏 new Thread(new Runnable() { @Override public void run() { Log.d("data", "收藏"); String requrl = "http://39.97.181.86/BaiXiaoSheng/findcollect?username=" + username + "&title=" + title + ""; boolean isStore = Boolean.parseBoolean(String.valueOf(HttpUtil.sendPost(requrl, ""))); Message msg = new Message(); msg.what = 400; msg.obj = isStore; blogHandler.sendMessage(msg); Log.d("收藏", String.valueOf(isStore)); } }).start(); } private void isAttention() { //是否关注 new Thread(new Runnable() { @Override public void run() { Log.d("data", "关注"); String requrl = "http://39.97.181.86/BaiXiaoSheng/findattention?username=" + username + "&authorname=" + authorname + ""; boolean isAttention = Boolean.parseBoolean(String.valueOf(HttpUtil.sendPost(requrl, ""))); Message msg = new Message(); msg.what = 500; msg.obj = isAttention; blogHandler.sendMessage(msg); Log.d("关注", String.valueOf(isAttention)); } }).start(); } private void attentionAction() { new Thread(new Runnable() { @Override public void run() { String text = attention.getText().toString(); String requrl = "http://39.97.181.86/BaiXiaoSheng/attentionaction?username=" + username + "&authorname=" + authorname + "&type=" + text.equals("关注") + ""; boolean flag = Boolean.parseBoolean(String.valueOf(HttpUtil.sendPost(requrl, ""))); Message msg = new Message(); msg.what = 700; msg.obj = flag; blogHandler.sendMessage(msg); } }).start(); } private void collectAction() { new Thread(new Runnable() { @Override public void run() { String requrl = "http://39.97.181.86/BaiXiaoSheng/collectaction?username=" + username + "&title=" + title + "&" + "type=" + judegIsDraw(collect) + ""; boolean flag = Boolean.parseBoolean(String.valueOf(HttpUtil.sendPost(requrl, ""))); Message msg = new Message(); msg.what = 800; msg.obj = flag; blogHandler.sendMessage(msg); } }).start(); } private void supportAction() { new Thread(new Runnable() { @Override public void run() { String requrl = "http://39.97.181.86/BaiXiaoSheng/supportaction?username=" + username + "&title=" + title + "&" + "type=" + judegIsDraw(support) + ""; boolean flag = Boolean.parseBoolean(String.valueOf(HttpUtil.sendPost(requrl, ""))); Message msg = new Message(); msg.what = 900; msg.obj = flag; blogHandler.sendMessage(msg); } }).start(); } private boolean judegIsDraw(View view) { //判断当前资源文件 boolean flag=false; switch (view.getId()) { case R.id.collect: flag= Objects.equals(((ImageView) view).getDrawable().getCurrent().getConstantState(), getResources().getDrawable(R.drawable.ic_turned_in_not).getConstantState()); Log.d("collect",String.valueOf(flag)); break; case R.id.support: flag= Objects.equals(((ImageView) view).getDrawable().getCurrent().getConstantState(), getResources().getDrawable(R.drawable.ic_thumb_not_up).getConstantState()); Log.d("support",String.valueOf(flag)); break; default: break; } return flag; } /* 写评论调用的线程 */ 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(); } /* 初始化展示该博客的评论内容 */ 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")); textViewbkauthorname.setText(bundle.getString("authorname")); authorname=bundle.getString("authorname"); Glide.with(this) .load(bundle.getString("authorurl")) .circleCrop() .into(bkphoto); } 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 300: if (Boolean.parseBoolean(msg.obj.toString())) mcontext.support.setImageResource(R.drawable.ic_thumb_up); break; case 400: if (Boolean.parseBoolean(msg.obj.toString())) mcontext.collect.setImageResource(R.drawable.ic_turned_in); break; case 500: if (Boolean.parseBoolean(msg.obj.toString())) mcontext.attention.setText("已关注"); break; 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 700: if (Boolean.parseBoolean(msg.obj.toString())) { String text = mcontext.attention.getText().toString(); if (text.equals("关注")) { mcontext.attention.setText("已关注"); Toast toast = Toast.makeText(mcontext, "关注成功", Toast.LENGTH_SHORT); toast.setGravity(Gravity.CENTER, 0, 0); toast.show(); } else { mcontext.attention.setText("关注"); Toast toast = Toast.makeText(mcontext, "已取消关注", Toast.LENGTH_SHORT); toast.setGravity(Gravity.CENTER, 0, 0); toast.show(); } } else { Toast toast = Toast.makeText(mcontext, "未知原因，操作失败", Toast.LENGTH_SHORT); toast.setGravity(Gravity.CENTER, 0, 0); toast.show(); } break; case 800: if (Boolean.parseBoolean(msg.obj.toString())) { if (mcontext.judegIsDraw(mcontext.collect)) { mcontext.collect.setImageResource(R.drawable.ic_turned_in); Toast toast = Toast.makeText(mcontext, "收藏成功", Toast.LENGTH_SHORT); toast.setGravity(Gravity.CENTER, 0, 0); toast.show(); } else { mcontext.collect.setImageResource(R.drawable.ic_turned_in_not); Toast toast = Toast.makeText(mcontext, "已取消收藏", Toast.LENGTH_SHORT); toast.setGravity(Gravity.CENTER, 0, 0); toast.show(); } } else { Toast toast = Toast.makeText(mcontext, "未知原因，操作失败", Toast.LENGTH_SHORT); toast.setGravity(Gravity.CENTER, 0, 0); toast.show(); } break; case 900: if (Boolean.parseBoolean(msg.obj.toString())) { if (mcontext.judegIsDraw(mcontext.support)) { mcontext.support.setImageResource(R.drawable.ic_thumb_up); Toast toast = Toast.makeText(mcontext, "点赞成功", Toast.LENGTH_SHORT); toast.setGravity(Gravity.CENTER, 0, 0); toast.show(); } else { mcontext.support.setImageResource(R.drawable.ic_thumb_not_up); Toast toast = Toast.makeText(mcontext, "已取消点赞", Toast.LENGTH_SHORT); toast.setGravity(Gravity.CENTER, 0, 0); toast.show(); } } else { Toast toast = Toast.makeText(mcontext, "未知原因，操作失败", Toast.LENGTH_SHORT); toast.setGravity(Gravity.CENTER, 0, 0); toast.show(); } 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; } } } }