这个东西进不去，只会闪退

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools">

    <application
        android:allowBackup="true"
        android:dataExtractionRules="@xml/data_extraction_rules"
        android:fullBackupContent="@xml/backup_rules"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.Falsewechat"
        tools:targetApi="31">
        <activity
            android:name="fragmentOne"
            android:exported="true">
       <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
           intent-filter>

            <meta-data
                android:name="android.app.lib_name"
                android:value="" />
        activity>
        <activity android:name=".MainActivity"
            android:exported="true">activity>
        <activity android:name=".XINGXI"
            android:exported="true">activity>
    application>

manifest>

package com.itheima.false_wechat;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;

public class fragmentOne extends Fragment {

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View v=inflater.inflate(R.layout.fragmentone,container,false);
        return super.onCreateView(inflater, container, savedInstanceState);
    }
}

package com.itheima.false_wechat;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Switch;

public class MainActivity extends AppCompatActivity  {

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

        Button b1,b2,b3,b4;
        b1=findViewById(R.id.b1);
        b2=findViewById(R.id.b2);
        b3=findViewById(R.id.b3);
        b4=findViewById(R.id.b4);

        b1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent=new Intent(MainActivity.this,XINGXI.class) ;
                startActivity(intent);

            }
        });





```xml

}

}

```java
package com.itheima.false_wechat;

import android.os.Bundle;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

public class XINGXI extends AppCompatActivity {
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.xingxi);
    }
}

<LinearLayout 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">


    <Button
        android:id="@+id/b1"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:background="@android:drawable/ic_dialog_email"
        android:contentDescription="@string/app_name">Button>
    <Button
        android:id="@+id/b2"
        android:background="?android:attr/actionModeFindDrawable"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1">Button>

    <Button
        android:id="@+id/b3"
        android:background="@drawable/ic_launcher_foreground"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1">Button>
    <Button
        android:id="@+id/b4"
        android:layout_width="0dp"
        android:background="@android:drawable/btn_star_big_on"
        android:layout_height="match_parent"
        android:layout_weight="1">Button>

LinearLayout>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >
   <fragment
       android:layout_width="match_parent"
       android:layout_gravity="bottom"
       android:name="com.itheima.false_wechat.fragmentOne"
       android:id="@+id/fr"
       xmlns:android="http://schemas.android.com/apk/res/android"
       xmlns:map="http://schemas.android.com/apk/res-auto"
       tools:context=".MainActivity"
       android:layout_height="60dp"
       tools:layout="@layout/activity_main"
       >


   fragment>



LinearLayout>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        app:srcCompat="@drawable/ic_launcher_foreground" />
LinearLayout>

你哪里有一个叫fragmentOne的activity啊

看看控制台有没有报错信息