Adroid_app/app/src/main/java/com/example/goukumusic/LoginSuccess.java

package com.example.goukumusic;

import android.annotation.SuppressLint;
import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentTransaction;


public class LoginSuccess extends AppCompatActivity implements View.OnClickListener{

    // 声明Fragment对象
    private Fragment_song fragment1;
    private Fragment_singer fragment2;
    private Fragment_audio fragment3;
    private Fragment_singleinformation fragment4;
    private Fragment nowFragment;
    // 声明底部标签
    private TextView tab1,tab2,tab3,tab4;
    private ImageView image1,image2,image3,image4;
    private LinearLayout song;
    private LinearLayout singer;
    private LinearLayout audio;
    private LinearLayout information;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login_success);
        initUI();  //初始化UI方法
    }

    // 初始化UI界面
    private void initUI(){
        // 初始化底部图像
        image1 = findViewById(R.id.imageone);
        image2 = findViewById(R.id.imagetwo);
        image3 = findViewById(R.id.imagethree);
        image4 = findViewById(R.id.imagefour);
        // 初始化底部标签
        tab1 = findViewById(R.id.one);
        tab2 = findViewById(R.id.two);
        tab3 = findViewById(R.id.three);
        tab4 = findViewById(R.id.four);
        // 初始化布局标签
        song = findViewById(R.id.song);
        singer = findViewById(R.id.singer);
        audio = findViewById(R.id.audio);
        information = findViewById(R.id.singleinformation);

        // 设置底部标签的变化，默认第一个被选中
        image1.setImageResource(R.drawable.song1);
        tab1.setTextColor(Color.parseColor("#41C9E2"));
        tab2.setTextColor(Color.parseColor("#8a8a8a"));
        tab3.setTextColor(Color.parseColor("#8a8a8a"));
        tab4.setTextColor(Color.parseColor("#8a8a8a"));

        // 为底部标签设置点击事件
       song.setOnClickListener(this);
       singer.setOnClickListener(this);
       audio.setOnClickListener(this);
       information.setOnClickListener(this);
        // 展示初始界面
        showFragment1();
    }

    // 设置Fragment1
    private void showFragment1(){
        // 开启事务，Fragment的切换是由事务控制
        @SuppressLint("CommitTransaction")
        FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
        // 隐藏所有的Fragment
        hideAllFragment(transaction);
        // 判断Fragment是否为空
        if(fragment1 == null){
            fragment1 = new Fragment_song();
            // 添加到Fragment1到事务中
            transaction.add(R.id.content_layout,fragment1);
        }   else {
            transaction.show(fragment1);
        }
//        // 记录fragment
//        nowFragment = fragment1;
        //提交事务
        transaction.commit();

        // 设置底部标签变化
        tab1.setTextColor(Color.parseColor("#41C9E2"));
        tab2.setTextColor(Color.parseColor("#8a8a8a"));
        tab3.setTextColor(Color.parseColor("#8a8a8a"));
        tab4.setTextColor(Color.parseColor("#8a8a8a"));
        // 设置图像的变化
        image1.setImageResource(R.drawable.song1);
        image2.setImageResource(R.drawable.singer);
        image3.setImageResource(R.drawable.audio);
        image4.setImageResource(R.drawable.singleinformation);
    }

    // 设置Fragment2
    private void showFragment2(){
        // 开启事务，Fragment的切换是由事务控制
        @SuppressLint("CommitTransaction")
        FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
        // 隐藏所有的Fragment
        hideAllFragment(transaction);
        // 判断Fragment是否为空
        if(fragment2 == null){
            fragment2 = new Fragment_singer();
            // 添加到Fragment2到事务中
            transaction.add(R.id.content_layout,fragment2);
        }   else{
            // 显示Fragment
            transaction.show(fragment2);
        }
//        // 记录fragment
//        nowFragment = fragment2;
        //提交事务
        transaction.commit();
        // 设置底部标签变化
        tab1.setTextColor(Color.parseColor("#8a8a8a"));
        tab2.setTextColor(Color.parseColor("#41C9E2"));
        tab3.setTextColor(Color.parseColor("#8a8a8a"));
        tab4.setTextColor(Color.parseColor("#8a8a8a"));
        // 设置图像的变化
        image1.setImageResource(R.drawable.song);
        image2.setImageResource(R.drawable.singer1);
        image3.setImageResource(R.drawable.audio);
        image4.setImageResource(R.drawable.singleinformation);

    }

    // 设置Fragment3
    private void showFragment3(){
        // 开启事务，Fragment的切换是由事务控制
        @SuppressLint("CommitTransaction")
        FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
        // 隐藏所有的Fragment
        hideAllFragment(transaction);
        // 判断Fragment是否为空
        if(fragment3 == null){
            fragment3 = new Fragment_audio();
            // 添加Fragment3到事务中
            transaction.add(R.id.content_layout,fragment3);
        }   else{
            // 显示Fragment
            transaction.show(fragment3);
        }
//        // 记录fragment
//        nowFragment = fragment3;
        //提交事务
        transaction.commit();
        // 设置底部标签变化
        tab1.setTextColor(Color.parseColor("#8a8a8a"));
        tab2.setTextColor(Color.parseColor("#8a8a8a"));
        tab3.setTextColor(Color.parseColor("#41C9E2"));
        tab4.setTextColor(Color.parseColor("#8a8a8a"));
        // 设置图像的变化
        image1.setImageResource(R.drawable.song);
        image2.setImageResource(R.drawable.singer);
        image3.setImageResource(R.drawable.audio1);
        image4.setImageResource(R.drawable.singleinformation);
    }

    // 设置Fragment4
    private void showFragment4(){
        // 开启事务，Fragment的切换是由事务控制
        @SuppressLint("CommitTransaction")
        FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
        // 隐藏所有的Fragment
        hideAllFragment(transaction);
        // 判断Fragment是否为空
        if(fragment4 == null){
            fragment4 = new Fragment_singleinformation();
            // 添加Fragment4到事务中
            transaction.add(R.id.content_layout,fragment4);
        }   else {
            // 显示Fragment
            transaction.show(fragment4);
        }
//        // 记录fragment
//        nowFragment = fragment4;
        //提交事务
        transaction.commit();

        // 设置底部标签变化
        tab1.setTextColor(Color.parseColor("#8a8a8a"));
        tab2.setTextColor(Color.parseColor("#8a8a8a"));
        tab3.setTextColor(Color.parseColor("#8a8a8a"));
        tab4.setTextColor(Color.parseColor("#41C9E2"));
        // 设置图像的变化
        image1.setImageResource(R.drawable.song);
        image2.setImageResource(R.drawable.singer);
        image3.setImageResource(R.drawable.audio);
        image4.setImageResource(R.drawable.singleinformation1);
    }

    // 隐藏所有的Fragment
    private void hideAllFragment(FragmentTransaction transaction){
        if (fragment1 != null){
            transaction.hide(fragment1);
        }
        if (fragment2 != null){
            transaction.hide(fragment2);
        }
        if (fragment3 != null){
            transaction.hide(fragment3);
        }
        if (fragment4 != null){
            transaction.hide(fragment4);
        }
    }

    // 设置点击事件
    @Override
    public void onClick(View view){
        int id = view.getId();
        if (id == R.id.song){
            showFragment1();
        }
        if (id == R.id.singer){
            showFragment2();
        }
        if (id == R.id.audio){
            showFragment3();
        }
        if (id == R.id.singleinformation){
            showFragment4();
        }
    }
}