个人冲刺二--体温四
RegisterActivity.java
package com.example.helloworld;
import android.content.Intent;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
/**
* Created by littlecurl 2018/6/24
*/
/**
* 此类 implements View.OnClickListener 之后，
* 就可以把onClick事件写到onCreate()方法之外
* 这样，onCreate()方法中的代码就不会显得很冗余
*/
public class RegisterActivity extends AppCompatActivity implements View.OnClickListener {
private String realCode;
private DBOpenHelper mDBOpenHelper;
private Button mBtRegisteractivityRegister;
private RelativeLayout mRlRegisteractivityTop;
private ImageView mIvRegisteractivityBack;
private LinearLayout mLlRegisteractivityBody;
private EditText mEtRegisteractivityUsername;
private EditText mEtRegisteractivityUserid;
private EditText mEtRegisteractivityUserphone;
private EditText mEtRegisteractivityUseraddress;
private EditText mEtRegisteractivityPhonecodes;
private ImageView mIvRegisteractivityShowcode;
private RelativeLayout mRlRegisteractivityBottom;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_register);
initView();
mDBOpenHelper = new DBOpenHelper(this);
//将验证码用图片的形式显示出来
mIvRegisteractivityShowcode.setImageBitmap(Code.getInstance().createBitmap());
realCode = Code.getInstance().getCode().toLowerCase();
}
private void initView(){
mBtRegisteractivityRegister = findViewById(R.id.bt_registeractivity_register);
mRlRegisteractivityTop = findViewById(R.id.rl_registeractivity_top);
mIvRegisteractivityBack = findViewById(R.id.iv_registeractivity_back);
mLlRegisteractivityBody = findViewById(R.id.ll_registeractivity_body);
mEtRegisteractivityUsername = findViewById(R.id.et_registeractivity_name);
mEtRegisteractivityUserid = findViewById(R.id.et_registeractivity_id);
mEtRegisteractivityUserphone = findViewById(R.id.et_registeractivity_phone);
mEtRegisteractivityUseraddress = findViewById(R.id.et_registeractivity_address);
mEtRegisteractivityPhonecodes = findViewById(R.id.et_registeractivity_phoneCodes);
mIvRegisteractivityShowcode = findViewById(R.id.iv_registeractivity_showCode);
mRlRegisteractivityBottom = findViewById(R.id.rl_registeractivity_bottom);
/**
* 注册页面能点击的就三个地方
* top处返回箭头、刷新验证码图片、注册按钮
*/
mIvRegisteractivityBack.setOnClickListener(this);
mIvRegisteractivityShowcode.setOnClickListener(this);
mBtRegisteractivityRegister.setOnClickListener(this);
}
public void onClick(View view) {
switch (view.getId()) {
case R.id.iv_registeractivity_back: //返回登录页面
Intent intent1 = new Intent(this, loginActivity.class);
startActivity(intent1);
finish();
break;
case R.id.iv_registeractivity_showCode: //改变随机验证码的生成
mIvRegisteractivityShowcode.setImageBitmap(Code.getInstance().createBitmap());
realCode = Code.getInstance().getCode().toLowerCase();
break;
case R.id.bt_registeractivity_register: //注册按钮
//获取用户输入的用户名、密码、验证码
String username = mEtRegisteractivityUsername.getText().toString().trim();
String userid = mEtRegisteractivityUserid.getText().toString().trim();
String userphone = mEtRegisteractivityUserphone.getText().toString().trim();
String useraddress = mEtRegisteractivityUseraddress.getText().toString().trim();
String phoneCode = mEtRegisteractivityPhonecodes.getText().toString().toLowerCase();
//注册验证
if (!TextUtils.isEmpty(username) && !TextUtils.isEmpty(userid) && !TextUtils.isEmpty(phoneCode) && !TextUtils.isEmpty(userphone)
&& !TextUtils.isEmpty(useraddress) ) {
if (phoneCode.equals(realCode)) {
//将用户名和密码加入到数据库中
mDBOpenHelper.add(username, userid,userphone,useraddress);
Intent intent2 = new Intent(this, MainActivity.class);
startActivity(intent2);
finish();
Toast.makeText(this, "验证通过，注册成功", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(this, "验证码错误,注册失败", Toast.LENGTH_SHORT).show();
}
}else {
Toast.makeText(this, "未完善信息，注册失败", Toast.LENGTH_SHORT).show();
}
break;
}
}
}
MyDBHelper.java
package com.example.helloworld;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.widget.Toast;
import androidx.annotation.Nullable;
public class MyDBHelper extends SQLiteOpenHelper {
private Context context;
public MyDBHelper(Context context,String name,int version) {
super(context, name, null, version);
this.context=context;
}
@Override
public void onCreate(SQLiteDatabase db) {
String sql="create table IF NOT EXISTS personwendu(id integer primary key autoincrement, address varchar, name varchar, wendu varchar, dateandtime varchar,more varchar)";
db.execSQL(sql);
Toast.makeText(context,"数据加入成功",Toast.LENGTH_LONG).show();
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}
DBOpenHelper.java
package com.example.helloworld;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
import java.util.ArrayList;
public class DBOpenHelper extends SQLiteOpenHelper {
/**
* 声明一个AndroidSDK自带的数据库变量db
*/
private SQLiteDatabase db;
/**
* 写一个这个类的构造函数，参数为上下文context，所谓上下文就是这个类所在包的路径
* 指明上下文，数据库名，工厂默认空值，版本号默认从1开始
* super(context,"db_test",null,1);
* 把数据库设置成可写入状态，除非内存已满，那时候会自动设置为只读模式
* 不过，以现如今的内存容量，估计一辈子也见不到几次内存占满的状态
* db = getReadableDatabase();
*/
public DBOpenHelper(Context context){
super(context,"db_test",null,1);
db = getReadableDatabase();
}
/**
* 重写两个必须要重写的方法，因为class DBOpenHelper extends SQLiteOpenHelper
* 而这两个方法是 abstract 类 SQLiteOpenHelper 中声明的 abstract 方法
* 所以必须在子类 DBOpenHelper 中重写 abstract 方法
* 想想也是，为啥规定这么死必须重写？
* 因为，一个数据库表，首先是要被创建的，然后免不了是要进行增删改操作的
* 所以就有onCreate()、onUpgrade()两个方法
* @param db
*/
@Override
public void onCreate(SQLiteDatabase db){
db.execSQL("CREATE TABLE IF NOT EXISTS user(" +
"_id INTEGER PRIMARY KEY AUTOINCREMENT," +
"username TEXT," +
"userid TEXT,"+
"userphone TEXT,"+
"useraddress TEXT)"
);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion){
db.execSQL("DROP TABLE IF EXISTS user");
onCreate(db);
}
/**
* 接下来写自定义的增删改查方法
* 这些方法，写在这里归写在这里，以后不一定都用
* add()
* delete()
* update()
* getAllData()
*/
public void add(String username,String userid,String userphone,String useraddress){
db.execSQL("INSERT INTO user (username,userid,userphone,useraddress) VALUES(?,?,?,?)",
new Object[]{username,userid,userphone,useraddress});
}
public void delete(String userphone){
db.execSQL("DELETE FROM user WHERE userphone = "+userphone);
}
public void updata(String userphone){
db.execSQL("UPDATE user SET userphone = ?",new Object[]{userphone});
}
/**
* 前三个没啥说的，都是一套的看懂一个其他的都能懂了
* 下面重点说一下查询表user全部内容的方法
* 我们查询出来的内容，需要有个容器存放，以供使用，
* 所以定义了一个ArrayList类的list
* 有了容器，接下来就该从表中查询数据了，
* 这里使用游标Cursor，这就是数据库的功底了，
* 在Android中我就不细说了，因为我数据库功底也不是很厚，
* 但我知道，如果需要用Cursor的话，第一个参数："表名"，中间5个：null，
* 最后是查询出来内容的排序方式："name DESC"
* 游标定义好了，接下来写一个while循环，让游标从表头游到表尾
* 在游的过程中把游出来的数据存放到list容器中
* @return
*/
public ArrayList<User> getAllData(){
ArrayList<User> list = new ArrayList<User>();
Cursor cursor = db.query("user",null,null,null,null,null,"username DESC");
cursor.moveToFirst();
while(cursor.moveToNext()){
String username = cursor.getString(cursor.getColumnIndex("username"));
String userid = cursor.getString(cursor.getColumnIndex("userid"));
String userphone = cursor.getString(cursor.getColumnIndex("userphone"));
String useraddress = cursor.getString(cursor.getColumnIndex("useraddress"));
list.add(new User(username,userid,userphone,useraddress));
}
Log.v("输出数据库查询结果：",list.toString());
return list;
}
}
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