Android页面跳转问题

想要实现登录后拍照，但按登录后直接闪退，不能跳到拍照页面，代码有什么问题呢
MainActivity.java

package com.example.mylogin;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.content.SharedPreferences;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    EditText name,pwd;
    Button btnlogin,btnreg;
    Mysql mysql;
    SQLiteDatabase db;
    SharedPreferences sp1,sp2;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        name = this.findViewById(R.id.name);            //用户名输入框
        pwd = this.findViewById(R.id.pwd);              //密码输入框
        btnlogin = this.findViewById(R.id.login);         //登录按钮
        btnreg = this.findViewById(R.id.reg);               //注册按钮
        sp1 =  this.getSharedPreferences("useinfo",this.MODE_PRIVATE);
        sp2 = this.getSharedPreferences("username",this.MODE_PRIVATE);

        name.setText(sp1.getString("usname",null));
        pwd.setText(sp1.getString("uspwd",null));
        mysql = new Mysql(this,"Userinfo",null,1);      //建数据库或者取数据库
        db = mysql.getReadableDatabase();
        btnlogin.setOnClickListener(new View.OnClickListener() {                //登录事件
            @Override
            public void onClick(View v) {
                String username = name.getText().toString();
                String password = pwd.getText().toString();                 //获取用户输入的用户名和密码
                //查询用户名和密码相同的数据
                Cursor cursor = db.query("logins",new String[]{"usname","uspwd"}," usname=? and uspwd=?",new String[]{username,password},null,null,null);

                int flag = cursor.getCount();                            //查询出来的记录项的条数，若没有该用户则为0条
                if(flag!=0){                                            //若查询出的记录不为0，则进行跳转操作
                    Intent intent = new Intent();
                    intent.setClass(MainActivity.this,Welcome.class);            //设置页面跳转
                    SharedPreferences.Editor editor = sp2.edit();
                    cursor.moveToFirst();                                   //将光标移动到position为0的位置，默认位置为-1
                    String loginname = cursor.getString(0);
                    editor.putString("Loginname",loginname);
                    editor.commit();                                        //将用户名存到SharedPreferences中
                    startActivity(intent);
                }
                else{
                    Toast.makeText(MainActivity.this,"用户名或密码错误！",Toast.LENGTH_LONG).show();             //提示用户信息错误或没有账号
                }

            }
        });

        btnreg.setOnClickListener(new View.OnClickListener() {                  //注册事件
            @Override
            public void onClick(View v) {

                Intent intent = new Intent();
                intent.setClass(MainActivity.this,Register.class);          //跳转到注册页面
                startActivity(intent);
                Toast.makeText(MainActivity.this,"前往注册！",Toast.LENGTH_SHORT).show();
            }
        });
    }
}

想要跳转到Welcome页面，Welcome.java

package com.example.mylogin;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;


public class Welcome extends AppCompatActivity {
    public static final int TAKE_PHOTO = 1;
    public static final int CHOOSE_PHOTO = 2;
    private ImageView picture;
    private Intent intent1,intent2;

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

        Button chooseFromAlbum = findViewById(R.id.choose_from_album);
        chooseFromAlbum.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (ContextCompat.checkSelfPermission(Welcome.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
                    ActivityCompat.requestPermissions(Welcome.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, CHOOSE_PHOTO);
                } else {
                    openAlbum();//打开album的界面
                }
            }
        });
        Button takePhoto = findViewById(R.id.take_photo);
        picture = findViewById(R.id.picture);

        takePhoto.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // 动态申请权限
                if (ContextCompat.checkSelfPermission(Welcome.this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
                    ActivityCompat.requestPermissions(Welcome.this, new String[]{Manifest.permission.CAMERA}, TAKE_PHOTO);
                } else {
                    // 启动相机程序
                    startCamera();
                }
            }
        });
        intent1=new Intent(this,Albums.class);//创建跳转到Albums显示的窗口的Intent
        intent2=new Intent(this,Camera.class);//创建跳转到Camera显示的窗口的Intent
    }

    private void openAlbum() {
        startActivity(intent1);//进入album的窗口界面
    }
    private void startCamera() {
        startActivity(intent2);//进入camera的窗口界面
        //Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
        // 指定图片的输出地址为imageUri
        //mPhotoPath = getSDPath()+"/"+ getPhotoFileName();//设置图片文件路径，getSDPath()和getPhotoFileName()具体实现在下面
        //intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
        //startActivityForResult(intent, TAKE_PHOTO);
    }
}

闪退日志贴出来