Android studio出错 麻烦看下哪里有问题

[低个子]

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;
}
}

[王能]

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