基于Android的短信管理系统

环境；Android studio3.4+
sqlite数据库基本的增删该查
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package com.admin.sms;import android.annotation.SuppressLint;import android.content.Context;import android.content.Intent;import android.content.SharedPreferences;import android.database.sqlite.SQLiteDatabase;import android.database.sqlite.SQLiteException;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.text.TextUtils;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;/** * @desc 登录界面 * @author 小强程序设计 * @QQ   2103752102 */public class LoginActivity extends AppCompatActivity implements View.OnClickListener {    private EditText et_username;    private EditText et_password;    private Button btn_login;    private Button btn_register;    // 数据库的名字    public static String dbName = "before.db";    // 数据库在手机里的路径    @SuppressLint("SdCardPath")    private static String DATABASE_PATH = "/data/data/com.admin.sms/databases/";    public boolean checkDataBase() {        SQLiteDatabase checkDB = null;        try {            String databaseFilename = DATABASE_PATH + dbName;            checkDB = SQLiteDatabase.openDatabase(databaseFilename, null,                    SQLiteDatabase.OPEN_READONLY);        } catch (SQLiteException e) {        }        if (checkDB != null) {            checkDB.close();        }        return checkDB != null ? true : false;    }    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_login);        initView();        initData();//        initDB();    }    private void initDB() {        boolean dbExist = checkDataBase();        if (dbExist) {        } else {// 不存在就把raw里的数据库写入手机            try {                copyDataBase();            } catch (IOException e) {                throw new Error("Error copying database");            }        }    }    /**     * 复制数据库到手机指定文件夹下 * @throwsIOException     */    public void copyDataBase() throws IOException {        String databaseFilenames = DATABASE_PATH + dbName;        File dir = new File(DATABASE_PATH);        if (!dir.exists())// 判断文件夹是否存在，不存在就新建一个            dir.mkdir();        FileOutputStream os = null;        try {            os = new FileOutputStream(databaseFilenames);// 得到数据库文件的写入流        } catch (FileNotFoundException e) {            e.printStackTrace();        }        InputStream is = getResources() .openRawResource(R.raw.before);        byte[] buffer = new byte[8192];        int count = 0;        try {            while ((count = is.read(buffer)) > 0) {                os.write(buffer, 0, count);                os.flush();            }        } catch (IOException e) {        }        try {            is.close();            os.close();        } catch (IOException e) {            e.printStackTrace();        }    }    private void initData() {        SharedPreferences sp = getSharedPreferences("user", Context.MODE_PRIVATE);        String username = sp.getString("username", "");        String password = sp.getString("password", "");        et_username.setText(username);        et_password.setText(password);    }    private void initView() {        et_username = (EditText) findViewById(R.id.et_username);        et_password = (EditText) findViewById(R.id.et_password);        btn_login = (Button) findViewById(R.id.btn_login);        btn_register = (Button) findViewById(R.id.btn_register);        btn_login.setOnClickListener(this);        btn_register.setOnClickListener(this);    }    @Override    public void onClick(View v) {        switch (v.getId()) {            case R.id.btn_login:                submit();                break;            case R.id.btn_register:                startActivity(new Intent(LoginActivity.this, RegisterActivity.class));                break;        }    }    private void submit() {        String username = et_username.getText().toString().trim();        if (TextUtils.isEmpty(username)) {            Toast.makeText(this, "账号不能为空", Toast.LENGTH_SHORT).show();            return;        }        String password = et_password.getText().toString().trim();        if (TextUtils.isEmpty(password)) {            Toast.makeText(this, "密码不能为空", Toast.LENGTH_SHORT).show();            return;        }        User user = SqliteHelper.login(new SqliteHelper(this), username, password);        if (user != null) {            SharedPreferences sp = getSharedPreferences("user", Context.MODE_PRIVATE);            SharedPreferences.Editor edit = sp.edit();            edit.putInt("id", user.getId());            edit.putString("username", username);            edit.putString("password", password);            edit.putString("name", user.getName());            edit.putString("phone", user.getPhone());            edit.putInt("sex", user.getSex());            edit.commit();            startActivity(new Intent(this, MainActivity.class));            finish();        } else {            Toast.makeText(this, "账号或密码错误", Toast.LENGTH_SHORT).show();        }    }}
有需要完整代码的请加Q ： 2103752102
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