Android混合式开发实现本地存储(Room)

1.引入依赖

 //数据库
    def room_version = "2.2.6"
    implementation "androidx.room:room-runtime:$room_version"
    annotationProcessor "androidx.room:room-compiler:$room_version"
    // optional - RxJava support for Room
    implementation "androidx.room:room-rxjava2:$room_version"
    // optional - Guava support for Room, including Optional and ListenableFuture
    implementation "androidx.room:room-guava:$room_version"
    // optional - Test helpers
    testImplementation "androidx.room:room-testing:$room_version"

2.编写实体类

import androidx.annotation.NonNull;
import androidx.room.Entity;
import androidx.room.PrimaryKey;

@Entity
public class Img {
    @PrimaryKey(autoGenerate = true)
    @NonNull
    private int id;
    private String path;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getPath() {
        return path;
    }

    public void setPath(String path) {
        this.path = path;
    }
}

 3编写表操作的Dao接口

import androidx.room.Dao;
import androidx.room.Delete;
import androidx.room.Insert;
import androidx.room.Query;
import androidx.room.Update;

import com.example.demo2.pojo.Img;

import java.util.List;

@Dao
public interface ImgDao {
    @Insert
    void addImg(Img img);
    @Update
    void updateImg(Img img);
    @Delete
    void deleteImg(Img img);
    @Query("select * from Img")
    List queryImg();
}

 4.定义操作数据库操作接口

import androidx.room.Database;
import androidx.room.RoomDatabase;
import androidx.room.TypeConverters;

import com.example.demo2.dao.AipInsurancePolicyDao;
import com.example.demo2.dao.ImgDao;
import com.example.demo2.pojo.AipInsurancePolicy;
import com.example.demo2.pojo.Img;


@Database(entities = {AipInsurancePolicy.class, Img.class}, version = 2, exportSchema = false)
@TypeConverters({Converters.class})
public abstract class baseDatabase extends RoomDatabase {
    public abstract AipInsurancePolicyDao AipInsurancePolicyDao();
    public abstract ImgDao ImgDao();
}

 5.调用

  baseDatabase = Room.databaseBuilder(this, baseDatabase.class, "word")
                //数据库操作比较耗时主要目的是熟悉数据库Room这句话代替了切换线程问题
                .allowMainThreadQueries()
                .build();
        aipInsurancePolicyDao = baseDatabase.AipInsurancePolicyDao();
        imgDao = baseDatabase.ImgDao();

    @JavascriptInterface
    public String addImg(String path) {
        Img img = new Img();
        img.setPath(path);
        Log.d("img",path);
        imgDao.addImg(img);
        return "添加成功";
    }

Vue

实现效果