Fragment应用

最新推荐文章于 2025-06-20 14:41:46 发布

原创最新推荐文章于 2025-06-20 14:41:46 发布 · 390 阅读

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#android-studio

这篇文章描述了一个使用AndroidAppCompatActivity和DataBindingUtil的示例，展示了如何在BottomNavigationView中通过Arouter实现不同Fragment的导航以及FragmentTransaction的管理。

package com.example.myapplication;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.databinding.DataBindingUtil;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;

import android.os.Bundle;
import android.view.MenuItem;

import com.alibaba.android.arouter.facade.annotation.Route;
import com.example.myapplication.databinding.ActivityMain5Binding;
import com.example.myapplication.fragment.FriendFragment;
import com.example.myapplication.fragment.HomeFragment;
import com.example.myapplication.fragment.MessageFragment;
import com.example.myapplication.fragment.MineFragment;
import com.example.myapplication.fragment.VideoFragment;
import com.example.myapplication.mvvm.AroutePath;
import com.google.android.material.bottomnavigation.BottomNavigationView;
@Route(path = AroutePath.MAIN)
public class MainActivity5 extends AppCompatActivity {

    ActivityMain5Binding main;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
//        setContentView(R.layout.activity_main5);
        main = DataBindingUtil.setContentView(this, R.layout.activity_main5);

        main.bn.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(@NonNull MenuItem item) {
                switch (item.getItemId()){
                    case R.id.aa:
                        changeFragment(HomeFragment.newInstance());break;
                    case R.id.ab:
                        changeFragment(FriendFragment.newInstance());break;
                    case R.id.ac:
                        changeFragment(VideoFragment.newInstance());break;
                    case R.id.ad:
                        changeFragment(MessageFragment.newInstance());break;
                    case R.id.ae:
                        changeFragment(MineFragment.newInstance());break;
                }
                return true;
            }

            private void changeFragment(Fragment newInstance) {
                FragmentManager manager = getSupportFragmentManager();
                //
                FragmentTransaction transaction = manager.beginTransaction();
                //
                transaction.replace(R.id.fram, newInstance);
                //
                transaction.commit();
            }
        });
    }
}