android 学习

今天写了注册界面

package com.example.myapplication2;

import android.content.ContentValues;
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;

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

public class zhuce extends AppCompatActivity {

    private DatabaseHelper2 dbHelper1;

    private EditText editText11;
    private EditText editText12;
    private EditText editText13;
    private EditText editText14;

    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_zhuce);

        dbHelper1=new DatabaseHelper2(this,"TTList2.db",null,3);
        dbHelper1.getWritableDatabase();

        editText11 = (EditText) findViewById(R.id.edit_11);
        editText12 = (EditText) findViewById(R.id.edit_12);
        editText13 = (EditText) findViewById(R.id.edit_13);
        editText14 = (EditText) findViewById(R.id.edit_14);

        Button button11=(Button)findViewById(R.id.button11);

        button11.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                SQLiteDatabase db=dbHelper1.getWritableDatabase();
                ContentValues values=new ContentValues();

                String m1=editText11.getText().toString();
                String m2=editText12.getText().toString();
                String m3=editText13.getText().toString();
                String m4=editText14.getText().toString();

                values.put("学号",m1);
                values.put("姓名",m2);
                values.put("手机号",m3);
                values.put("班级",m4);


                if(m1.equals("")||m2.equals("")||m3.equals("")||m4.equals(""))
                {
                    Toast.makeText(zhuce.this, "信息不全，请补充", Toast.LENGTH_SHORT).show();
                }
                else{
                    db.insert("TTList2",null,values);
                    //注意别漏掉
                    values.clear();
                    Toast.makeText(zhuce.this, "注册成功", Toast.LENGTH_SHORT).show();
                    editText11.setText("");//保存成功清空学号和姓名信息
                    editText12.setText("");
                    editText13.setText("");
                    editText14.setText("");

                }
            }
        });


    }
}