2024/4/15

今日计划：开始写主页面后端功能代码

package com.example.team;

import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.util.Log;
import android.widget.FrameLayout;
import android.widget.Toast;

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

import com.example.R;
import com.example.fri.Friend2;
import com.google.android.material.tabs.TabLayout;

public class Iwriter extends AppCompatActivity {

    private FrameLayout container;
    private FragmentManager fragmentManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_view);
        String username = getIntent().getStringExtra("username");

        container = findViewById(R.id.container);
        TabLayout tabLayout = findViewById(R.id.tablayout);
        fragmentManager = getSupportFragmentManager();
        tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
            @Override
            public void onTabSelected(TabLayout.Tab tab) {
                Fragment selectedFragment = null;

                switch (tab.getPosition()) {

                    case 0:
                        selectedFragment = new HomeFrament(); // Instantiate SpaceFragment
                        Bundle bundle = new Bundle();
                        bundle.putString("username", username); // 将用户名放入Bundle中
                        selectedFragment.setArguments(bundle);
                        break;
                    case 1:

//                        Intent intent = new Intent();
//                        //前一个（MainActivity.this）是目前页面，后面一个是要跳转的下一个页面
//                        intent.putExtra("ff", username);
//                        intent.setClass(Iwriter.this, RjList.class);
//                        startActivity(intent);
//                        break;

                        selectedFragment = new RjListFragment(); // Instantiate SpaceFragment
                        Bundle bundle1 = new Bundle();
                        bundle1.putString("ff", username); // 将用户名放入Bundle中
                        selectedFragment.setArguments(bundle1);
                        break;
                    case 2:
                        Intent intent1 = new Intent();
                        //前一个（MainActivity.this）是目前页面，后面一个是要跳转的下一个页面
                        intent1.putExtra("ff", username);
                        intent1.setClass(Iwriter.this, Friend2.class);
                        startActivity(intent1);
                        break;
                    case 3:
                        selectedFragment = new SpaceFragment(); // Instantiate SpaceFragment
                        Bundle bundle3 = new Bundle();
                        bundle3.putString("username", username); // 将用户名放入Bundle中
                        selectedFragment.setArguments(bundle3); // 将Bundle传递给SpaceFragment
                        break;
                }
                if (selectedFragment != null) {
                    FragmentTransaction transaction = fragmentManager.beginTransaction();
                    transaction.replace(R.id.container, selectedFragment);
                    transaction.commit();
                }
            }

            @Override
            public void onTabUnselected(TabLayout.Tab tab) {
                // Do something when a tab is unselected
                Log.d("TabLayout", "Tab unselected: " + tab.getText());
                // Hide related content
            }

            @Override
            public void onTabReselected(TabLayout.Tab tab) {
                // Do something when a tab is reselected
                Log.d("TabLayout", "Tab reselected: " + tab.getText());
                // Scroll to the top of the content
            }
        });
    }

    private void logoutAndReturnToMainActivity() {
        saveLoginStatus(false);
        Toast.makeText(getApplicationContext(), "已退出登录", Toast.LENGTH_LONG).show();
        Intent intent = new Intent(Iwriter.this, MainActivity.class);
        startActivity(intent);
        finish();
    }

    private void saveLoginStatus(boolean isLoggedIn) {
        SharedPreferences sharedPreferences = getSharedPreferences("loginStatus", Context.MODE_PRIVATE);
        SharedPreferences.Editor editor = sharedPreferences.edit();
        editor.putBoolean("isLoggedIn", isLoggedIn);
        editor.apply();
    }
}

存在问题：暂无