アプリで撮った写真の名前を変える方法

AndroidManifest.xmlを変更する必要はない。

MainActivity.kt

package com.sample.android.camerasample

import android.content.ContentValues
import android.content.Intent
import android.net.Uri
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.provider.MediaStore
import android.view.View
import android.widget.ImageView
import android.widget.Toast
import java.text.SimpleDateFormat
import java.util.*

class MainActivity : AppCompatActivity() {

    private val _requestCodeFood = 1000
    private val _requestCodeDrink = 2000

    private var _imageUri: Uri? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
    }

    public override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        if (resultCode == RESULT_OK) {
            val ivCamera = findViewById<ImageView>(R.id.ivCamera)
            ivCamera.setImageURI(_imageUri)
            if (requestCode == _requestCodeFood) {
                Toast.makeText(applicationContext, "Food Saved", Toast.LENGTH_SHORT).show()
            } else if (requestCode == _requestCodeDrink) {
                Toast.makeText(applicationContext, "Drink Saved", Toast.LENGTH_SHORT).show()
            }
        }
    }

    fun onFoodButtonClick(view: View) {
        _imageUri = makeImageUri("Food")
        val intent = Intent(MediaStore.ACTION_IMAGE_CAPTURE)
        intent.putExtra(MediaStore.EXTRA_OUTPUT, _imageUri)
        startActivityForResult(intent, _requestCodeFood)
    }

    fun onDrinkButtonClick(view: View) {
        _imageUri = makeImageUri("Drink")
        val intent = Intent(MediaStore.ACTION_IMAGE_CAPTURE)
        intent.putExtra(MediaStore.EXTRA_OUTPUT, _imageUri)
        startActivityForResult(intent, _requestCodeDrink)
    }

    private fun makeFileName(head: String): String {
        val dateFormat = SimpleDateFormat("yyyyMMddHmmss")
        val nowStr = dateFormat.format(Date())
        val fileName = "${head}_${nowStr}.jpg"
        return fileName
    }

    private fun makeImageUri(head: String): Uri {
        val fileName = makeFileName(head)
        val resolver = applicationContext.contentResolver
        val collection = MediaStore.Images.Media.getContentUri(MediaStore.VOLUME_EXTERNAL_PRIMARY)
        val values = ContentValues().apply {
            put(MediaStore.Images.Media.DISPLAY_NAME, fileName)
            put(MediaStore.Images.Media.TITLE, fileName)
            put(MediaStore.Images.Media.MIME_TYPE, "image/jpeg")
        }
        val imageUri = resolver.insert(collection, values)!!
        return imageUri
    }

}

strings.xml

<resources>
    <string name="app_name">CameraSample</string>
    <string name="food">食事</string>
    <string name="drink">飲み物</string>
</resources>

activity_main.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"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    <ImageView
            android:id="@+id/ivCamera"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintBottom_toTopOf="@+id/llButtons"
            android:layout_marginTop="5dp"
            android:layout_marginLeft="5dp"
            android:layout_marginRight="5dp"
            android:layout_gravity="center"/>
    <LinearLayout
            android:id="@+id/llButtons"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:layout_constraintBottom_toBottomOf="parent"
            android:orientation="vertical">
        <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="horizontal">
            <Button
                    android:id="@+id/btnEat"
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="0.5"
                    android:text="@string/food"
                    android:textSize="22sp"
                    android:paddingTop="20dp"
                    android:paddingBottom="20dp"
                    android:onClick="onFoodButtonClick"/>
            <Button
                    android:id="@+id/btnBody"
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="0.5"
                    android:text="@string/drink"
                    android:textSize="22sp"
                    android:paddingTop="20dp"
                    android:paddingBottom="20dp"
                    android:onClick="onDrinkButtonClick"/>
        </LinearLayout>
    </LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>