单击 ImageButton 时如何向数据库添加/插入图像

问题描述

我正在制作一个带有菜单列表（名称、描述、价格、图像）的送餐应用。将名称、描述和价格添加到数据库中很容易，但如何添加图像。

更具体地说，我想使用 ImageButton（单击时）打开手机的文件管理器，然后从那里选择图像，让它显示在 ImageButton 上，然后单击 ADD 按钮将其插入到数据库中。我想知道是否还有其他更简单的方法可以做到这一点。

menu_adding.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center_horizontal"
android:orientation="vertical">

<ListView
    android:id="@+id/menu_list"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:mode="twoLine"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent">

</ListView>

<RelativeLayout
    android:id="@+id/relativeLayout"
    android:layout_width="match_parent"
    android:layout_height="220dp"
    android:orientation="horizontal"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="1.0">

    <ImageView
        android:id="@+id/add_image"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:src="@mipmap/ic_launcher"
        android:padding="5dp" />

    <EditText
        android:id="@+id/add_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:hint="Name"
        android:padding="5dp"
        android:layout_toRightOf="@id/add_image" />

    <EditText
        android:id="@+id/add_desc"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:hint="Description"
        android:padding="5dp"
        android:layout_toRightOf="@id/add_image"
        android:layout_below="@id/add_name"/>

    <EditText
        android:id="@+id/add_price"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:hint="Price"
        android:padding="5dp"
        android:layout_toRightOf="@+id/add_image"
        android:layout_below="@+id/add_desc"/>

    <Button
        android:id="@+id/add_data"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Add"
        android:padding="5dp"
        android:layout_toEndOf="@id/add_price"
        android:layout_below="@id/add_desc"
        android:layout_marginLeft="15dp"/>
</RelativeLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

MenuDatabaseHelper.java

public class MenuDatabaseHelper extends sqliteOpenHelper {

sqliteDatabase db;
List<Menu> menuList = new ArrayList<>();

private static final String MENU_DB = "MenuDB.db";
private static final String MENU_TABLE = "Menu_Table";

//column
private static final String ID = "ID";
//private static final String MENU_IMAGE = "Menu_Image";
private static final String MENU_NAME = "Menu_Name";
private static final String MENU_DESC = "Menu_Desc";
private static final String MENU_PRICE = "Menu_Price";

private static final String CREATE_MENU_TABLE = "CREATE TABLE " + MENU_TABLE +
        " ( ID INTEGER PRIMARY KEY AUTOINCREMENT," +
        //MENU_IMAGE + " BLOB," +
        MENU_NAME + " TEXT," +
        MENU_DESC + " TEXT," +
        MENU_PRICE + " TEXT ) " ;

public MenuDatabaseHelper(Context context){super(context,MENU_DB,null,1);}

@Override
public void onCreate(sqliteDatabase sqliteDatabase) {
    sqliteDatabase.execsql(CREATE_MENU_TABLE);
}

@Override
public void onUpgrade(sqliteDatabase sqliteDatabase,int i,int i1) {
    sqliteDatabase.execsql("DROP TABLE IF EXISTS " + MENU_TABLE);
    onCreate(sqliteDatabase);
}

//create method to insert data
public boolean insertMenuData(String Menu_Name,String Menu_Desc,String Menu_Price){
    sqliteDatabase db = this.getWritableDatabase();
    ContentValues contentValues = new ContentValues();
    //contentValues.put(MENU_IMAGE,Menu_Image);
    contentValues.put(MENU_NAME,Menu_Name);
    contentValues.put(MENU_DESC,Menu_Desc);
    contentValues.put(MENU_PRICE,Menu_Price);

    long result = db.insert(MENU_TABLE,contentValues);

    return result != -1; //if result = -1 data doesn't insert
}
}

MenuAdding.java

public class MenuAdding extends AppCompatActivity {

MenuDatabaseHelper db;

Button add_data;
EditText add_name;
EditText add_desc;
EditText add_price;
ImageView add_image;
ListView menu_list;


ArrayList<String> listItem;
ArrayList<String> listItem2;
ArrayAdapter adapter;


@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.menu_adding);

    db = new MenuDatabaseHelper(MenuAdding.this);

    add_data = findViewById(R.id.add_data);
    add_image = findViewById(R.id.add_image);
    add_name = findViewById(R.id.add_name);
    add_desc = findViewById(R.id.add_desc);
    add_price = findViewById(R.id.add_price);
    menu_list = findViewById(R.id.menu_list);
    listItem = new ArrayList<>();
    listItem2 = new ArrayList<>();

    viewData();

    menu_list.setonItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> adapterView,View view,long l) {
            String text = menu_list.getItemAtPosition(i).toString();
            Toast.makeText(MenuAdding.this,""+text,Toast.LENGTH_SHORT).show();
        }
    });

    add_data.setonClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            //String image = add_image.get
            String name = add_name.getText().toString();
            String desc = add_desc.getText().toString();
            String price = add_price.getText().toString();
            if (!name.equals("") && db.insertMenuData(name,desc,price)){
                Toast.makeText(MenuAdding.this,"Data added.",Toast.LENGTH_SHORT).show();
                add_name.setText("");
                add_desc.setText("");
                add_price.setText("");
                listItem.clear();
                viewData();
            }   else {
                Toast.makeText(MenuAdding.this,"Data not added.",Toast.LENGTH_SHORT).show();
            }
        }
    });
}

private void viewData() {
    Cursor cursor = db.viewData();

    if (cursor.getCount() == 0){
        Toast.makeText(this,"No data to show",Toast.LENGTH_SHORT).show();
    } else{
        while (cursor.movetoNext()){
            listItem.add(cursor.getString(1)); // index 1 is name,index 0 is ID
            listItem2.add(cursor.getString(2));
        }
        adapter = new ArrayAdapter<>(this,android.R.layout.simple_list_item_1,listItem);//create custom adapter
        menu_list.setAdapter(adapter);
    }
}

}

解决方法

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android-imagebutton android-sqlite android-studio

单击 ImageButton 时如何向数据库添加/插入图像

问题描述

解决方法

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