第二阶段冲刺-5

一、说在前面

1、今天任务：完善热搜界面（预计2h）

2、明天任务：分词实现

3、遇到问题：RecyclerView的复用功能（如下）

　　解决：//直接关闭掉RecyclerView的复用功能 holder.setIsRecyclable(false);

二、效果

  三、代码

1、MainActivity

package com.example.hotsearch;

import androidx.appcompat.app.AppCompatActivity;
import androidx.lifecycle.Observer;
import androidx.lifecycle.ViewModelProviders;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.List;

public class MainActivity extends AppCompatActivity {
    NewsViewModel newsViewModel;
    RecyclerView recyclerView;
    MyAdapter myAdapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final String[] url = {"http://192.168.0.101:8081/new/getTopNewsServlet"};
        recyclerView = findViewById(R.id.RecyclerView);
        myAdapter = new MyAdapter();
        newsViewModel = ViewModelProviders.of(this).get(NewsViewModel.class);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        recyclerView.setAdapter(myAdapter);
        newsViewModel.getJson(url[0]);
        newsViewModel.getAllNews().observe(this, new Observer<List<New_>>() {
            @Override
            public void onChanged(List<New_> new_s) {
                myAdapter.setAllNews(new_s);
                myAdapter.notifyDataSetChanged();
            }
        });

    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        newsViewModel.deleteWords();
    }
}

2、myAdapter

package com.example.hotsearch;

import android.app.AlertDialog;
import android.content.Context;
import android.graphics.Color;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

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

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {
    List<New_> allNews = new ArrayList<>();

    public void setAllNews(List<New_> allNews) {
        this.allNews = allNews;
    }

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

    @Override
    public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
        New_ new_ = allNews.get(position);
        if (position+1<=3){
            holder.textViewNumber.setTextSize(24);
            holder.textViewNumber.setTextColor(Color.parseColor("#ffcc0000"));
        }
        holder.textViewNumber.setText(String.valueOf(position+1));
        holder.editTextTitle.setText(new_.getTitle());
        holder.editTextTitle.setBackground(null);
//        holder.editTextTitle.setEnabled(false);
        holder.editTextTitle.setFocusable(false);
        if (new_.getCommentCount()>10000){
            holder.buttonHot.setText("爆");
            holder.buttonHot.setBackgroundResource(R.drawable.btn_circle_bao);
        }else if (new_.getCommentCount()>5000){
            holder.buttonHot.setBackgroundResource(R.drawable.btn_circle_hot);
        }
        if (new_.getCommentCount()<5000){
            holder.buttonHot.setVisibility(View.INVISIBLE);
        }
        //直接关闭掉RecyclerView的复用功能
        holder.setIsRecyclable(false);
        holder.editTextTitle.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

            }
        });
        holder.textViewSearchNum.setText(String.valueOf(new_.getCommentCount()));
    }

    @Override
    public int getItemCount() {
        return allNews.size();
    }

    //用来管理我们新建的ConstraintLayout
    static class MyViewHolder extends RecyclerView.ViewHolder {
        TextView textViewNumber,textViewSearchNum;
        EditText editTextTitle;
        Button buttonHot;
        public MyViewHolder(@NonNull View itemView) {
            super(itemView);
            textViewNumber = itemView.findViewById(R.id.textViewNumber);
            editTextTitle = itemView.findViewById(R.id.editTextTitle);
            textViewSearchNum = itemView.findViewById(R.id.textViewSearchNum);
            buttonHot = itemView.findViewById(R.id.buttonHot);
        }
    }
}

3、xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:background="@drawable/head_background"
        app:layout_constraintBottom_toTopOf="@+id/guideline"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.0" />

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/RecyclerView"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="@+id/guideline"
        app:layout_constraintVertical_bias="1.0" />

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/guideline"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.3" />

</androidx.constraintlayout.widget.ConstraintLayout>