我是编程新手，通过权限，我从用户那里获取了图像，并将其转换为Bitmap后将其设置为ImageView，我还创建了一个数据库和表，现在下一步该图像和文本到SQLite并显示在recyclerView上？
activity_main_xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
tools:context=".MainActivity">
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="text"
android:id="@+id/text"
/>
<ImageView
android:id="@+id/GotImage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/text"
android:layout_centerHorizontal="true"
/>
<Button
android:id="@+id/ImageBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="163dp"
android:text="Choose Photo" />
<Button
android:id="@+id/Add"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="219dp"
android:text="Add" />
<!--<android.support.v7.widget.RecyclerView-->
<!--android:layout_width="match_parent"-->
<!--android:layout_height="wrap_content"-->
<!--android:layout_below="@id/Add"-->
<!--android:id="@+id/recycler">-->
<!--</android.support.v7.widget.RecyclerView>-->
</RelativeLayout>
模型类
package com.example.muhammadrizwan.sqliterecyclerview
class Catogeries(var name:String,var Image:Byte) {
}
DbHelper
package com.example.muhammadrizwan.sqliterecyclerview
import android.content.ContentValues
import android.content.Context
import android.database.sqlite.SQLiteDatabase
import android.database.sqlite.SQLiteOpenHelper
class DbHelper(var ctx:Context) : SQLiteOpenHelper(ctx,"My Datbase",null,1) {
override fun onCreate(db: SQLiteDatabase?) {
var create_table = "CREATE TABLE CATOGERIES (_Id INTEGER PRIMARY KEY AUTOINCREMENT , NAME STRING,IMAGE BLOB)"
db?.execSQL(create_table)
}
override fun onUpgrade(p0: SQLiteDatabase?, p1: Int, p2: Int) {
}
fun insertData(catogeries: Catogeries,db:SQLiteDatabase)
{
var dbHelper = this.writableDatabase
var value = ContentValues()
value.put("Name",catogeries.name)
value.put("Image",catogeries.Image)
db.insert("Catogeries",null,value)
}
}
MainActivity
package com.example.muhammadrizwan.sqliterecyclerview
import android.app.Activity
import android.app.AlertDialog
import android.content.DialogInterface
import android.content.Intent
import android.content.pm.PackageManager
import android.graphics.Bitmap
import android.graphics.BitmapFactory
import android.media.Image
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.provider.MediaStore
import android.support.v4.app.ActivityCompat
import android.support.v4.content.ContextCompat
import android.widget.Button
import android.widget.EditText
import android.widget.ImageView
import android.widget.Toast
import kotlinx.android.synthetic.main.activity_main.*
import java.io.ByteArrayOutputStream
class MainActivity : AppCompatActivity() {
private lateinit var Title: EditText
private lateinit var imageBtn: Button
var CameraRequestCode :Int = 200
var GalleryRequestCode :Int = 100
private lateinit var _addBtn: Button
var db = DbHelper(this)
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
//_Image = findViewById<ImageView>(R.id.GotImage)
Title = findViewById<EditText>(R.id.text)
imageBtn = findViewById<Button>(R.id.ImageBtn)
_addBtn = findViewById<Button>(R.id.Add)
_addBtn.setOnClickListener {
var _title = Title.text.trim().toString()
}
imageBtn.setOnClickListener {
var dialogueBox = AlertDialog.Builder(this)
var dialogueOptions = arrayOf("Camera","Gallery")
dialogueBox.setTitle("Make Choice")
dialogueBox.setItems(dialogueOptions,object : DialogInterface.OnClickListener
{
override fun onClick(p0: DialogInterface?, p1: Int) {
if(dialogueOptions[p1].equals("Camera"))
{
OpenCamera()
}
if (dialogueOptions[p1].equals("Gallery"))
{
OpenGallery()
}
}
})
dialogueBox.show()
}
}
private fun OpenGallery() {
if(ContextCompat.checkSelfPermission(this,android.Manifest.permission.READ_EXTERNAL_STORAGE)== PackageManager.PERMISSION_GRANTED)
{
var GalleryIntent = Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI)
startActivityForResult(GalleryIntent,GalleryRequestCode)
}
else
{
ActivityCompat.requestPermissions(this, arrayOf(android.Manifest.permission.READ_EXTERNAL_STORAGE),GalleryRequestCode)
}
}
private fun OpenCamera() {
if(ContextCompat.checkSelfPermission(this,android.Manifest.permission.CAMERA)== PackageManager.PERMISSION_GRANTED)
{
val CameraIntent = Intent(MediaStore.ACTION_IMAGE_CAPTURE)
startActivityForResult(CameraIntent,CameraRequestCode)
}
else
{
ActivityCompat.requestPermissions(this, arrayOf(android.Manifest.permission.CAMERA),CameraRequestCode)
}
}
override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) {
when(requestCode)
{
CameraRequestCode->
{
if(grantResults.size>0 && grantResults[0]== PackageManager.PERMISSION_GRANTED )
{
OpenCamera()
}
else
{
Toast.makeText(this,"Error", Toast.LENGTH_SHORT).show()
}
}
GalleryRequestCode->
{
if(grantResults.size>0 && grantResults[0]== PackageManager.PERMISSION_GRANTED)
{
OpenGallery()
}
else
{
Toast.makeText(this,"Error", Toast.LENGTH_SHORT).show()
}
}
}
}
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
super.onActivityResult(requestCode, resultCode, data)
when(requestCode)
{
CameraRequestCode->
{
if(resultCode== Activity.RESULT_OK)
{
val img = data?.extras?.get("data")
GotImage.setImageBitmap(img as Bitmap)
}
}
GalleryRequestCode->
{
if(resultCode== RESULT_OK)
{
var URI = data!!.data
var Image = MediaStore.Images.Media.getBitmap(this.contentResolver,URI)
GotImage.setImageBitmap(Image)
}
}
}
}
}