如何在 SQLite 中存储图像以及如何以任何表格格式导出输入文本和图像？

Question

1) 请帮我把按钮提交的图片存储到 SQLite。

2) 我如何在我的应用程序中实现导出功能，以便存储在 SQLite 中的所有输入文本和图像都可以以任何格式导出，但以表格方式导出，以便导出的文件可用于再次检索数据。

DatabaseHelper.java

package com.example.himanshu.instrumentalinformationcollector;

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


public class DatabaseHelper extends SQLiteOpenHelper {

private static final int DATABASE_VERSION = 3;
private static final String DATABASE_NAME = "instruments.db";
private static final String TABLE_NAME = "instrument_table";
public static final String COL_1 = "ID";
public static final String COL_2 = "NAME";
public static final String COL_3 = "LOCATION";
public static final String COL_4 = "INFORMATION";

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

@Override
public void onCreate(SQLiteDatabase sqLiteDatabase) {
    String CREATE_TABLE="CREATE TABLE " + DatabaseHelper.TABLE_NAME + " (" +
            DatabaseHelper.COL_1 + " INTEGER,"
            + DatabaseHelper.COL_2  + " TEXT,"
            + DatabaseHelper.COL_3 + " TEXT,"
            + DatabaseHelper.COL_4 + " TEXT);";
    sqLiteDatabase.execSQL(CREATE_TABLE);

}

@Override
public void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i1) {
    sqLiteDatabase.execSQL("DROP TABLE IF EXISTS " +DatabaseHelper.TABLE_NAME);
    onCreate(sqLiteDatabase);

}
public boolean insertData(Integer ID, String name, String location, String information){
    SQLiteDatabase sqLiteDatabase = this.getWritableDatabase();

    ContentValues contentValues = new ContentValues();

    contentValues.put(DatabaseHelper.COL_1,ID);
    contentValues.put(DatabaseHelper.COL_2,name);
    contentValues.put(DatabaseHelper.COL_3,location);
    contentValues.put(DatabaseHelper.COL_4,information);

    sqLiteDatabase.insert(DatabaseHelper.TABLE_NAME,null,contentValues);
    return true;
}
}

MainActivity.java

package com.example.himanshu.instrumentalinformationcollector;

import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.os.ParcelFileDescriptor;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;

import java.io.FileDescriptor;
import java.io.IOException;

public class MainActivity extends AppCompatActivity{
private static int RESULT_LOAD_IMAGE = 1;
DatabaseHelper myDB;
EditText editMessage,editMessage1,editMessage2,editMessage3;
Button submitData;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    Button buttonLoadImage = (Button)findViewById(R.id.imgButton);
    buttonLoadImage.setOnClickListener(new View.OnClickListener() {


        @Override
        public void onClick(View arg0) {

            Intent i = new Intent(
                    Intent.ACTION_PICK,
                    android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);

            startActivityForResult(i, RESULT_LOAD_IMAGE);
        }
    });
    myDB = new DatabaseHelper(this);

    editMessage=(EditText)findViewById(R.id.editText);
    editMessage1=(EditText)findViewById(R.id.editText1);
    editMessage2=(EditText)findViewById(R.id.editText2);
    editMessage3=(EditText)findViewById(R.id.editText3);
    submitData=(Button)findViewById(R.id.submit);
    AddData();

}

public void AddData(){
    submitData.setOnClickListener(
            new View.OnClickListener(){
                @Override
                public void onClick(View v){
                    boolean isInserted = myDB.insertData(Integer.valueOf(editMessage.getText().toString()),editMessage1.getText().toString(),editMessage2.getText().toString(),editMessage3.getText().toString());
                if(isInserted == true)
                    Toast.makeText(MainActivity.this,"Data Inserted",Toast.LENGTH_LONG).show();
                    else
                    Toast.makeText(MainActivity.this,"Data not Inserted",Toast.LENGTH_LONG).show();
                }
            }
    );
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && null != data) {
        Uri selectedImage = data.getData();
        String[] filePathColumn = { MediaStore.Images.Media.DATA };

        Cursor cursor = getContentResolver().query(selectedImage,
                filePathColumn, null, null, null);
        cursor.moveToFirst();

        int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
        String picturePath = cursor.getString(columnIndex);
        cursor.close();

        ImageView imageView = (ImageView) findViewById(R.id.img);

        Bitmap bmp = null;

        try {
            bmp = getBitmapFromUri(selectedImage);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        imageView.setImageBitmap(bmp);

    }


}

private Bitmap getBitmapFromUri(Uri uri) throws IOException {
    ParcelFileDescriptor parcelFileDescriptor =
            getContentResolver().openFileDescriptor(uri, "r");
    FileDescriptor fileDescriptor = parcelFileDescriptor.getFileDescriptor();
    Bitmap image = BitmapFactory.decodeFileDescriptor(fileDescriptor);
    parcelFileDescriptor.close();
    return image;
}

}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<ScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
        tools:context="com.example.himanshu.instrumentalinformationcollector.MainActivity">
    <RelativeLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">
        <TextView
            android:layout_alignParentLeft="true"
            android:layout_marginTop="30dp"
            android:layout_marginLeft="16sp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="ID"
            android:id="@+id/textView"
            android:textColor="@android:color/black"
            />
        <ImageView
            android:layout_alignParentRight="true"
            android:layout_width="100dp"
            android:layout_height="100dp"
            android:id="@+id/img"
            android:background="@drawable/gray"
            android:layout_marginRight="5dp"
            android:layout_marginTop="5dp"
            />
        <Button
            android:layout_alignParentRight="true"
            android:layout_below="@id/img"
            android:layout_marginRight="10dp"
            android:id="@+id/imgButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:clickable="true"
            android:text="Upload"
            android:textSize="16sp"
            />
        <EditText
            android:layout_marginTop="15dp"
            android:id="@+id/editText"
            android:layout_toRightOf="@id/textView"
            android:layout_toLeftOf="@id/imgButton"
            android:layout_width="200dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="45sp"
            android:layout_marginRight="30sp"
            android:hint="Please enter here"
            android:maxLength="6"
            android:textSize="16sp"
            android:inputType="number"
            />
        <TextView
            android:layout_alignParentLeft="true"
            android:layout_below="@id/textView"
            android:layout_marginTop="50dp"
            android:layout_marginLeft="16sp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Name"
            android:textSize="16sp"
            android:id="@+id/textView1"
            android:textColor="@android:color/black"
            />
        <EditText
            android:id="@+id/editText1"
            android:layout_marginTop="30dp"
            android:layout_below="@id/editText"
            android:layout_toRightOf="@id/textView1"
            android:layout_toLeftOf="@id/imgButton"
            android:layout_width="200dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="16sp"
            android:hint="Full Name"
            android:textSize="16sp"
            android:inputType="textCapWords"
            />
    </RelativeLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="horizontal">
        <TextView
            android:layout_marginTop="5dp"
            android:layout_marginLeft="16sp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Location"
            android:textSize="16sp"
            android:id="@+id/textView3"
            android:textColor="@android:color/black"
            />
        <EditText
            android:id="@+id/editText2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:hint="Please enter here"
            android:textSize="16sp"
            android:inputType="textCapSentences"
            android:layout_weight="1"
            />
    </LinearLayout>
    <RelativeLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp">
    <TextView
        android:layout_marginTop="16dp"
        android:layout_marginLeft="16sp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Information"
        android:textSize="16sp"
        android:id="@+id/textView2"
        android:textColor="@android:color/black"
        />
    <EditText
        android:layout_alignParentLeft="true"
        android:layout_toRightOf="@id/textView2"
        android:layout_below="@id/textView2"
        android:layout_marginTop="5dp"
        android:layout_marginLeft="16sp"
        android:id="@+id/editText3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="textMultiLine|textCapSentences"
        android:gravity="top"
        android:hint="Describe briefly"
        android:textSize="16sp"
        >
    </EditText>
    </RelativeLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="horizontal">
        <Button
            android:id="@+id/submit"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Submit"
            android:layout_weight="1"
            android:layout_marginRight="16dp"
            android:layout_marginLeft="16dp"
            />

        <Button
            android:id="@+id/export"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Export"
            android:layout_weight="1"
            android:layout_marginRight="16dp"
            android:layout_marginLeft="16dp"/>
    </LinearLayout>
</LinearLayout>

Answer 1

您问题的答案很长 - 需要您做很多修改。

保存图像：

如果要保存图片，需要将图片转为字节数组
更可行的方法是将图像保存为应用程序内部存储中的文件，在数据库中添加一列，将图像名称保存在公共目录中 "s8u903wmips.jpg" 作为示例。

正在导出数据：

Content Provider 正是出于这个原因而创建的。 https://developer.android.com/guide/topics/providers/content-providers.html
内容提供商是 Android 应用程序的主要构建块之一，为应用程序提供内容。它们封装数据并通过单个 ContentResolver 接口将其提供给应用程序。仅当您需要在多个应用程序之间共享数据时才需要内容提供程序。例如，联系人数据由多个应用程序使用，必须存储在内容提供程序中。如果您不需要在多个应用程序之间共享数据，您可以直接通过 SQLiteDatabase 使用数据库。

如何在 SQLite 中存储图像以及如何以任何表格格式导出输入文本和图像？

How to store images in SQLite and also how I can export input text and image in any tabular format?

java

xml

android

android-sqlite

android-studio