10.21

概述<?xmlversion="1.0"encoding="utf-8"?><RelativeLayoutxmlns:android="http://schemas.android.com/apkes/android"xmlns:app="http://schemas.android.com/apkes-auto"xmlns:tools="http://schemas.android

<?xml version="1.0" enCoding="utf-8"?><relativeLayout 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"tools:context=".MainActivity"><TextVIEw    androID:ID="@+ID/tv1"    androID:layout_wIDth="wrap_content"    androID:layout_height="wrap_content"    androID:text="用户名："    androID:textSize="20dp"    androID:layout_margintop="50dp"    /><EditText    androID:ID="@+ID/et1"    androID:layout_wIDth="500dp"    androID:layout_height="wrap_content"    androID:layout_toRightOf="@+ID/tv1"    androID:layout_margintop="40dp"    androID:textSize="20dp"    /><TextVIEw    androID:ID="@+ID/tv2"    androID:layout_wIDth="wrap_content"    androID:layout_height="wrap_content"    androID:text="密码："    androID:textSize="20dp"    androID:layout_margintop="40dp"    androID:layout_below="@+ID/tv1"    /><EditText    androID:ID="@+ID/et2"    androID:layout_wIDth="500dp"    androID:layout_height="wrap_content"    androID:layout_toRightOf="@+ID/tv2"    androID:layout_margintop="20dp"    androID:textSize="30dp"    androID:layout_below="@+ID/et1"    />    <button        androID:layout_margintop="80dp"        androID:layout_wIDth="200dp"        androID:layout_height="wrap_content"        androID:text="注册"        androID:textSize="40dp"        androID:layout_below="@+ID/et2"        androID:layout_centerHorizontal="true"        androID:onClick="click"        /></relativeLayout>

package com.example.myapplication; import androID.content.ContentValues;import androID.os.Bundle;import androID.app.Activity;import androID.database.sqlite.sqliteDatabase;import androID.vIEw.Menu;import androID.vIEw.VIEw;import androID.Widget.EditText; public class MainActivity extends Activity {     private String username;    private String password;    @OverrIDe    protected voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.activity_main);                        }     public voID click(VIEw vIEw){        username =((EditText) findVIEwByID(R.ID.et1)).getText().toString();        password =((EditText) findVIEwByID(R.ID.et2)).getText().toString();        StuOpenHelper helper = new StuOpenHelper(this);        sqliteDatabase db =helper.getReadableDatabase();        ContentValues cv = new ContentValues();        cv.put("username",username);        cv.put("password",password);        db.insert("stu",null,cv);        db.close();    }}

package com.example.myapplication; import androID.content.Context;import androID.database.sqlite.sqliteDatabase;import androID.database.sqlite.sqliteDatabase.CursorFactory;import androID.database.sqlite.sqliteOpenHelper; public class StuOpenHelper extends sqliteOpenHelper{     public StuOpenHelper(Context context) {        super(context, "stu.db", null, 5);        // Todo auto-generated constructor stub    }     @OverrIDe    public voID onCreate(sqliteDatabase db) {        System.out.println("第一次创建");        String sql = "CREATE table stu (_ID integer PRIMARY KEY autoINCREMENT,USERname VARCHAR(20),PASSWORD  VARCHAR(20))";        db.execsql(sql);             }     @OverrIDe    public voID onUpgrade(sqliteDatabase db, int oldVersion, int newVersion) {        // Todo auto-generated method stub            System.out.println("更新"+oldVersion+"  "+newVersion);            if(oldVersion==5 && newVersion==6) {                String sql = "CREATE table bj (_ID integer PRIMARY KEY autoINCREMENT,CLASSname VARCHAR(20))";                db.execsql(sql);            }     }}

 

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