Android studio出错 麻烦看下哪里有问题

Question

帮忙看一下哪里出问题了  主界面是新增学生跟查看学生 点新增学生就会进入registerActivity  这个步骤出错  代码如下
MainActivity
public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button add=findViewById(R.id.add);
        Button show=findViewById(R.id.show);
        add.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent=new Intent(MainActivity.this,RegisterActivity.class);
                startActivity(intent);
            }
        });
        show.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent=new Intent(MainActivity.this,ShowActivity.class);
                startActivity(intent);
            }
        });
        }
    }
registerActivity
public class RegisterActivity extends AppCompatActivity {
    private int headchoose;
    protected static List<Show> data=new ArrayList<Show>();
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.register);
        final EditText et_name=findViewById(R.id.et_name);
        final EditText et_age=findViewById(R.id.et_age);
        final EditText et_sex=findViewById(R.id.et_sex);
        final EditText et_add=findViewById(R.id.et_add);
        Button head1=findViewById(R.id.head1);
        Button head2=findViewById(R.id.head2);
        Button head3=findViewById(R.id.head3);
        Button head4=findViewById(R.id.head4);
        Button sure=findViewById(R.id.sure);
        head1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Show stu=new Show(et_name.getText().toString(),et_age.getText().toString(),et_sex.getText().toString(),
                        et_add.getText().toString(),"","","","",R.mipmap.picture_1);
                data.add(stu);
            }
        });
        head2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Show stu=new Show(et_name.getText().toString(),et_age.getText().toString(),et_sex.getText().toString(),
                        et_add.getText().toString(),"","","","",R.mipmap.picture_1);
                data.add(stu);
            }
        });
        head3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Show stu=new Show(et_name.getText().toString(),et_age.getText().toString(),et_sex.getText().toString(),
                        et_add.getText().toString(),"","","","",R.mipmap.picture_1);
                data.add(stu);
            }
        });
        head4.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Show stu=new Show(et_name.getText().toString(),et_age.getText().toString(),et_sex.getText().toString(),
                        et_add.getText().toString(),"","","","",R.mipmap.picture_1);
                data.add(stu);
            }
        });
        sure.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent=new Intent(RegisterActivity.this,MainActivity.class);
                startActivity(intent);
            }
        });    }
    public  List trans(){
        return data;
    }
}

Answer 1

日志，日志，日志，错误原因，错误原因，错误原因
新手帖https://blog.csdn.net/weimingjue/article/details/87921494