Kotlin：将图像保存到数据库

我在kotlin创建用户配置文件，我想给用户两个选项（从头像选择或捕获图像），然后保存在“sqlite”数据库中的配置文件

什么是最好的解决方案？

如果你在代码中帮我，我会很感激

Answer 1

嘿，我得到了解决方案::

创建数据库类“DatabaseHelper.kt”::

class DatabaseHelper(context: Context) : SQLiteOpenHelper(context, DATABASE_NAME, null, 1) { override fun onCreate(db: SQLiteDatabase) { db.execSQL("Create Table $TABLE_NAME(ID INTEGER PRIMARY KEY AUTOINCREMENT,Category_img BLOB)") } override fun onUpgrade(db: SQLiteDatabase, oldVersion: Int, newVersion: Int) { db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME) onCreate(db) } fun insertData(Category_img: ByteArray): Boolean { val db = writableDatabase val cv = ContentValues() cv.put(CAL_NO1, Category_img) val result = db.insert(TABLE_NAME, null, cv) return if (result .equals( -1)) false else true } fun getdata(): ByteArray { val db = writableDatabase val res = db.rawQuery("select * from " + TABLE_NAME, null) if (res.moveToFirst()) { do { return res.getBlob(0) } while (res.moveToNext()) } return byteArrayOf() } companion object { private val DATABASE_NAME = "user.db" private val TABLE_NAME = "tbl_user" private val CAL_NO1 = "Category_img" } } 

并从你想访问的地方做代码相机::

  class MainActivity : AppCompatActivity() { var dbSq: DatabaseHelper= DatabaseHelper(this); override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) val cameraIntent = Intent(MediaStore.ACTION_IMAGE_CAPTURE) startActivityForResult(cameraIntent, 101) } public override fun onActivityResult(requestcode: Int, resultcode: Int, intent: Intent) { super.onActivityResult(requestcode, resultcode, intent) if (resultcode == Activity.RESULT_OK) { if (requestcode == 101) { val photo = intent.extras!!.get("data") as Bitmap val stream = ByteArrayOutputStream() photo.compress(Bitmap.CompressFormat.PNG, 100, stream) val byteArray = stream.toByteArray() Log.d("check",dbSq.insertData(byteArray).toString().plus(" ")); } } } 

希望它能为你工作。

谢谢，让我知道如果你需要做更多。

编辑：

“DatabaseHelper.kt” ::

 class DatabaseHelper(context: Context) : SQLiteOpenHelper(context, DATABASE_NAME, null, 1) { override fun onCreate(db: SQLiteDatabase) { db.execSQL("Create Table $TABLE_NAME(ID INTEGER PRIMARY KEY AUTOINCREMENT,Category_img Text)") } override fun onUpgrade(db: SQLiteDatabase, oldVersion: Int, newVersion: Int) { db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME) onCreate(db) } fun insertData(Category_img: String): Boolean { val db = writableDatabase val cv = ContentValues() cv.put(CAL_NO1, Category_img) val result = db.insert(TABLE_NAME, null, cv) return if (result .equals( -1)) false else true } companion object { private val DATABASE_NAME = "user.db" private val TABLE_NAME = "tbl_user" private val CAL_NO1 = "Category_img" } } 

并从你想访问的地方做代码相机::

 class MainActivity : AppCompatActivity() { var dbSq: DatabaseHelper= DatabaseHelper(this); internal var output: File? = null override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) val cameraIntent = Intent(MediaStore.ACTION_IMAGE_CAPTURE) val dir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM) val date = Date() output = File(dir, "CheckImage " + date.toString()+".jpeg") startActivityForResult(cameraIntent, 101) } public override fun onActivityResult(requestcode: Int, resultcode: Int, intent: Intent) { super.onActivityResult(requestcode, resultcode, intent) if (resultcode == Activity.RESULT_OK) { if (requestcode == 101) { Log.d("check",dbSq.insertData(output!!.absolutePath).toString().plus(" ")); } } } }