定义实体类Product， 包含属性：id,name,time,price； 创建Activity，在界面上输入一些Product对象，并将它们保存到SQLite数据库中，同时也可以输入关键字进行检索出相应的Product对象。

首先，我们创建一个名为`Product`的实体类，它包含所需的属性：

public class Product {
    private int id;
    private String name;
    private long time; // 时间通常以毫秒为单位
    private double price;

    // 构造函数
    public Product(int id, String name, long time, double price) {
        this.id = id;
        this.name = name;
        this.time = time;
        this.price = price;
    }

    // getter 和 setter 方法
    public int getId() { return id; }
    public void setId(int id) { this.id = id; }

    public String getName() { return name; }
    public void setName(String name) { this.name = name; }

    public long getTime() { return time; }
    public void setTime(long time) { this.time = time; }

    public double getPrice() { return price; }
    public void setPrice(double price) { this.price = price; }
}

接下来，我们需要一个`DatabaseHelper`类来处理SQLite操作，包括添加、查询产品：

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

public class DatabaseHelper extends SQLiteOpenHelper {
    // 数据库表名和字段定义
    private static final String TABLE_NAME = "products";
    private static final String COLUMN_ID = "id";
    private static final String COLUMN_NAME = "name";
    private static final String COLUMN_TIME = "time";
    private static final String COLUMN_PRICE = "price";

    // 索引和创建表的SQL语句
    private static final String CREATE_TABLE = "CREATE TABLE IF NOT EXISTS " + TABLE_NAME +
            " (" + COLUMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT," +
            COLUMN_NAME + " TEXT NOT NULL," +
            COLUMN_TIME + " INTEGER NOT NULL," +
            COLUMN_PRICE + " REAL NOT NULL)";

    public DatabaseHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(CREATE_TABLE);
    }

    // 添加产品到数据库
    public void addProduct(Product product) {
        SQLiteDatabase db = this.getWritableDatabase();
        ContentValues contentValues = new ContentValues();
        contentValues.put(COLUMN_NAME, product.getName());
        contentValues.put(COLUMN_TIME, product.getTime());
        contentValues.put(COLUMN_PRICE, product.getPrice());
        db.insert(TABLE_NAME, null, contentValues);
        db.close();
    }

    // 根据关键字检索产品
    public Cursor searchProducts(String keyword) {
        SQLiteDatabase db = this.getReadableDatabase();
        String query = "SELECT * FROM " + TABLE_NAME + " WHERE name LIKE ?";
        return db.rawQuery(query, new String[]{ "%" + keyword + "%" });
    }
}

在`Activity`中，你可以通过`EditText`获取用户输入，然后实例化`Product`对象并保存到数据库，以及提供搜索功能：

// 获取用户输入并保存
EditText inputName = findViewById(R.id.input_name);
EditText inputTime = findViewById(R.id.input_time);
EditText inputPrice = findViewById(R.id.input_price);
Button saveBtn = findViewById(R.id.save_button);

saveBtn.setOnClickListener(view -> {
    String name = inputName.getText().toString();
    long time = Long.parseLong(inputTime.getText().toString());
    double price = Double.parseDouble(inputPrice.getText().toString());

    Product product = new Product(0, name, time, price); // 假设id暂未设置
    databaseHelper.addProduct(product);
});

// 搜索产品
EditText searchKeyword = findViewById(R.id.search_keyword);
Button searchBtn = findViewById(R.id.search_button);

searchBtn.setOnClickListener(view -> {
    String keyword = searchKeyword.getText().toString();
    Cursor cursor = databaseHelper.searchProducts(keyword);
    // 处理查询结果
});