以前传递数据都是使用Intent进行传递，但是intent是跳转，我们这个是动态替换 所以刚开始也是一脸懵逼，百度也百度不到，就自己慢慢摸索出来了：

话不多说，直接上代码：(主要核心代码加粗)

package com.smartgentechnology;
import android.content.Intent;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.TextView;

public class HomePage extends AppCompatActivity implements View.OnClickListener {//动态替换碎片
    private TextView tab1, tab2, tab3, user;
    private String jurisdiction;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_homepage);

        Intent intentHome = getIntent();
        jurisdiction = intentHome.getStringExtra("importid");
        String username = intentHome.getStringExtra("importname");
        user = findViewById(R.id.home_name);
        user.setText(username);
        initView();//初始化数据
    }

    private void initView() {
        tab1 = findViewById(R.id.set);
        tab2 = findViewById(R.id.statement);
        tab3 = findViewById(R.id.repaire);
        tab1.setOnClickListener(this);
        tab2.setOnClickListener(this);
        tab3.setOnClickListener(this);
        tab1.setSelected(true);
        replaceFragment(new BasicSetting(), jurisdiction);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.set:
                selected();
                tab1.setSelected(true);
                replaceFragment(new BasicSetting(), jurisdiction);
                break;
            case R.id.statement:
                selected();
                tab2.setSelected(true);
                replaceFragment(new Report(), jurisdiction);
                break;
            case R.id.repaire:
                selected();
                tab3.setSelected(true);
                replaceFragment(new RepairModule(), jurisdiction);
                break;
        }
    }


  private void replaceFragment(Fragment fragment, String uid) {
        FragmentManager fragmentManager = getSupportFragmentManager();
        FragmentTransaction transaction = fragmentManager.beginTransaction();
        transaction.replace(R.id.main_fragment, fragment);
        Bundle bundle = new Bundle();//使用Bundle传递数据
        bundle.putString("msg", uid);
        fragment.setArguments(bundle);
        transaction.commit();
    }

    private void selected() {//初始化是否选中的状态
        tab1.setSelected(false);
        tab2.setSelected(false);
        tab3.setSelected(false);
    }
}

在碎片中接收数据：

//获得窗体传递来的数据
Bundle bundle= BasicSetting.this.getArguments();
//显示传递来的数据
String uid = bundle.getString("msg");
//Log.i("chulaiba",bundle.getString("msg"));

android动态替换Fragment向下传递数据