第四次安卓作业（用户添加）

<?xml version="1.0" encoding="utf-8"?>
<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"
android:orientation="vertical"
tools:context=".MainActivity" >

<TextView
android:id="@+id/textView"
android:layout_width="match_parent"
android:layout_height="40dp"
android:background="#00BCD4"
android:gravity="center"
android:text="学生注册页面"
android:textSize="30sp"
android:textStyle="bold" />

<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">

<TableLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="50dp">

<TableRow
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center">

<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="姓名：" />

<EditText
android:id="@+id/e_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="textPersonName" />
</TableRow>

<TableRow
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center">

<TextView
android:id="@+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="年龄：" />

<EditText
android:id="@+id/e_age"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="textPersonName" />
</TableRow>

</TableLayout>

<Button
android:id="@+id/button"
android:layout_width="150dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_margin="100dp"
android:gravity="center"
android:text="注册"
android:textSize="20sp"
android:textStyle="bold" />
</LinearLayout>

</LinearLayout>

package com.example.huji;

import androidx.appcompat.app.AppCompatActivity;

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.TextView;

public class MainActivity extends AppCompatActivity {
private Button button;
private TextView name;
private EditText age;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button = (Button)findViewById(R.id.button);
name = (TextView)findViewById(R.id.e_name);
age = (EditText) findViewById(R.id.e_age);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
insert(name.getText().toString(),age.getText().toString());
}
});
}
public void insert(String name,String age){
Student helper = new Student(this);
SQLiteDatabase db = helper.getWritableDatabase();
ContentValues values = new ContentValues();
values.put("name",name);
values.put("age",age);
long id = db.insert("stu",null,values);
db.close();
}
}

package com.example.huji;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

import androidx.annotation.Nullable;

public class Student extends SQLiteOpenHelper {
public Student(@Nullable Context context) {
super(context, "student.db", null, 1);
}

@Override
public void onCreate(SQLiteDatabase db) {
String sql = "CREATE TABLE stu(s_id INTEGER PRIMARY KEY AUTOINCREMENT,name VARCHAR(20),age INTEGER)";
db.execSQL(sql);
}

@Override
public void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i1) {

}
}