package com.example.administrator.myapplicationsqllite;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
private EditText et_account; //账号输入框
private EditText et_password; //密码输入框
private Button btn_login; //登录按钮
private Button btn_massage;//显示数据
private TextView textView;
private TextView textView2;
private MyHelper myHelper;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myHelper = new MyHelper(this);
initView();
}
/**
* 初始化按钮
* 只有保存和显示按钮
*/
private void initView() {
et_account = (EditText) findViewById(R.id.et_account);
et_password = (EditText) findViewById(R.id.et_password);
btn_login =(Button) findViewById(R.id.btn_login);
btn_massage = (Button) findViewById(R.id.btn_show_massage);
textView = (TextView) findViewById(R.id.tv_massage);
textView2 = (TextView) findViewById(R.id.tv_massage2);
//设置按钮的带年纪监听事件
btn_login.setOnClickListener(this);
btn_massage.setOnClickListener(this);
}
/**
* 点击监听方法
* @param v 试图数据返回
*/
@Override
public void onClick(View v) {
SQLiteDatabase db;
ContentValues values;
switch (v.getId()) {
case R.id.btn_login: //当点击登录按钮时,获取界面上的输入的qq账号和密码
String account = et_account.getText().toString();
String password = et_password.getText().toString();
//校验输入的账号与密码是否为空
if (TextUtils.isEmpty(account)) {
Toast.makeText(this,"请输入QQ账号",Toast.LENGTH_SHORT).show();
return;
}
if (TextUtils.isEmpty(password)) {
Toast.makeText(this,"请输入密码账号",Toast.LENGTH_SHORT).show();
return;
}
Toast.makeText(this,"登录成功",Toast.LENGTH_SHORT).show();
db = myHelper.getWritableDatabase(); //获取可读写的SQLitDatebase对象
values = new ContentValues(); // 创建ContentValues对象
values.put("account", account);
values.put("password", password);
long id = db.insert("information", null, values);
System.out.println("数据==>" + id);
Toast.makeText(this, "信息已添加", Toast.LENGTH_SHORT).show();
db.close(); //关闭数据库链接
break;
case R.id.btn_show_massage: //查询数据
db = myHelper.getReadableDatabase();
Cursor cursor = db.query("information", null, null, null, null, null,null);
if (cursor.getCount() == 0) {
et_account.setText(" "); //提升信息没有获取到
Toast.makeText(this, "数据为空", Toast.LENGTH_SHORT).show();
} else {
cursor.moveToFirst();
String useraccount = cursor.getString(1);
String pwd = cursor.getString(2);
textView.setText(useraccount);
textView2.setText(pwd);
}
break;
}
}
class MyHelper extends SQLiteOpenHelper {
public MyHelper(Context context) {
super(context,"itcast1.db",null,1);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("create table information(id INTEGER primary key autoincrement,account varchar(20),password varchar(20))");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}
}
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#E6E6E6"
android:orientation="vertical"
android:padding="10dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="15dp"
android:background="@android:color/white"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="10dp"
android:text="账号:"
android:textColor="#000"
android:textSize="20sp" />
<EditText
android:id="@+id/et_account"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="5dp"
android:background="@null"
android:padding="10dp" />
LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:background="@android:color/white"
android:orientation="horizontal">
<TextView
android:id="@+id/tv_password"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="10dp"
android:text="密码:"
android:textColor="#000"
android:textSize="20sp" />
<EditText
android:id="@+id/et_password"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="5dp"
android:background="@null"
android:inputType="textPassword"
android:padding="10dp" />
LinearLayout>
<Button
android:id="@+id/btn_login"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="25dp"
android:background="#3C8DC4"
android:text="登录"
android:textColor="@android:color/white"
android:textSize="20sp" />
<Button
android:id="@+id/btn_show_massage"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="25dp"
android:background="#3C8DC4"
android:text="点击显示账户密码"
android:textColor="@android:color/white"
android:textSize="20sp" />
<TextView
android:id="@+id/tv_massage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20dp"
/>
<TextView
android:id="@+id/tv_massage2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20dp"/>
LinearLayout>
布局文件
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#E6E6E6"
android:orientation="vertical"
android:padding="10dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="15dp"
android:background="@android:color/white"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="10dp"
android:text="账号:"
android:textColor="#000"
android:textSize="20sp" />
<EditText
android:id="@+id/et_account"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="5dp"
android:background="@null"
android:padding="10dp" />
LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:background="@android:color/white"
android:orientation="horizontal">
<TextView
android:id="@+id/tv_password"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="10dp"
android:text="密码:"
android:textColor="#000"
android:textSize="20sp" />
<EditText
android:id="@+id/et_password"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="5dp"
android:background="@null"
android:inputType="textPassword"
android:padding="10dp" />
LinearLayout>
<Button
android:id="@+id/btn_login"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="25dp"
android:background="#3C8DC4"
android:text="登录"
android:textColor="@android:color/white"
android:textSize="20sp" />
<Button
android:id="@+id/btn_show_massage"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="25dp"
android:background="#3C8DC4"
android:text="点击显示账户密码"
android:textColor="@android:color/white"
android:textSize="20sp" />
<TextView
android:id="@+id/tv_massage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20dp"
/>
<TextView
android:id="@+id/tv_massage2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20dp"/>
LinearLayout>
package com.example.administrator.myapplication;
import android.content.Context;
import android.content.SharedPreferences;
import java.util.HashMap;
import java.util.Map;
/**
* Created by Administrator on 2022/3/29.
* 进行SharePreferences的保存
*/
public class SharePreferencesSaves {
//先进行保存qq账号和密码
/**
* 使用SharePreferences保存数据
* @param context 上下问环境
* @param account 账号
* @param password 密码
* @return 结果为保存成功的提示
*/
public static boolean saveUserInfo(Context context, String account, String password) {
SharedPreferences sharedPreferences = context.getSharedPreferences("data", Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit(); //获取编辑方法
editor.putString("account", account);
editor.putString("password",password);
editor.commit(); //提交
return true;
}
/**
* 从data中获取存储的数据
* @param context 上下文环境对象
* @return 从SharePreferences中获取数据其中名称为:data.xml
*/
public static Map<String, String> getUserInfo(Context context) {
SharedPreferences sharedPreferences = context.getSharedPreferences("data", Context.MODE_PRIVATE);
String account = sharedPreferences.getString("account", null);
String password = sharedPreferences.getString("password", null);
Map<String, String> userMap = new HashMap<>(); //将数据进行保存返回到主函数中
userMap.put("account",account);
userMap.put("password",password);
return userMap;
}
}
package com.example.administrator.myapplication;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import java.util.Map;
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
private EditText et_account; //账号输入框
private EditText et_password; //密码输入框
private Button btn_login; //登录按钮
private Button btn_massage;//显示数据
private TextView textView;
private TextView textView2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
//通过工具类FileSaveQQ中的getUserInfo()方法获取qq账号与密码信息
Map<String, String> userInfo = SharePreferencesSaves.getUserInfo(this);
}
/**
* 初始化按钮
*/
private void initView() {
et_account = (EditText) findViewById(R.id.et_account);
et_password = (EditText) findViewById(R.id.et_password);
btn_login =(Button) findViewById(R.id.btn_login);
btn_massage = (Button) findViewById(R.id.btn_show_massage);
textView = (TextView) findViewById(R.id.tv_massage);
textView2 = (TextView) findViewById(R.id.tv_massage2);
//设置按钮的带年纪监听事件
btn_login.setOnClickListener(this);
btn_massage.setOnClickListener(this);
}
/**
* 点击监听方法
* @param v 试图数据返回
*/
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btn_login: //当点击登录按钮时,获取界面上的输入的qq账号和密码
String account = et_account.getText().toString();
String password = et_password.getText().toString();
//校验输入的账号与密码是否为空
if (TextUtils.isEmpty(account)) {
Toast.makeText(this,"请输入QQ账号",Toast.LENGTH_SHORT).show();
return;
}
if (TextUtils.isEmpty(password)) {
Toast.makeText(this,"请输入密码账号",Toast.LENGTH_SHORT).show();
return;
}
Toast.makeText(this,"登录成功",Toast.LENGTH_SHORT).show();
//保持用户信息
boolean isSaveSuccess = SharePreferencesSaves.saveUserInfo(this,account,password);
if (isSaveSuccess) {
Toast.makeText(this,"保持成功",Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(this,"保持失败",Toast.LENGTH_SHORT).show();
}
break;
case R.id.btn_show_massage:
Map<String, String> userInfo = SharePreferencesSaves.getUserInfo(this);
String useraccoun = userInfo.get("account");
String passwor = userInfo.get("password");
et_account.setText(userInfo.get("account")); //将获取的账号显示到界面上
textView.setText(useraccoun);
textView2.setText(passwor);
et_password.setText(userInfo.get("password")); //将获取的密码显示到界面上
break;
}
}
}