Android Application
Kotlin 파일처리 : 외부 저장소 : 저장 읽기
작성자 임베디드코리아
작성일 23-10-05 01:11
조회1,571회
댓글0건
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activity_main.xml
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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
android:orientation="vertical"
tools:context=".MainActivity">
<Button
android:id="@+id/direct_saveBT"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Direct External"/>
<EditText
android:id="@+id/dataET"
android:layout_width="match_parent"
android:layout_height="100dp"
android:hint="Enter your message"/>
<Button
android:id="@+id/external_saveBT"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="External Save"/>
<Button
android:id="@+id/external_loadBT"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Read message" />
<TextView
android:id="@+id/tv_output"
android:layout_width="match_parent"
android:layout_height="200dp"
android:background="#F2F89B"/>
</LinearLayout>
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MainActivity.kt
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class MainActivity : AppCompatActivity(), View.OnClickListener {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
val read = findViewById<Button>(R.id.direct_saveBT)
val write = findViewById<Button>(R.id.external_saveBT)
val clear = findViewById<Button>(R.id.external_loadBT)
read.setOnClickListener(this)
write.setOnClickListener(this)
clear.setOnClickListener(this)
}
override fun onClick(view: View?) {
var dir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOCUMENTS).toString() +
File.separator + "my_folder"
if(view?.id==R.id.direct_saveBT){
val EXTERNAL_PATH: String = "/sdcard/Documents"
var message = "Embedded\nKorea"
val SDcardFile = SimpleDateFormat("yyyy-MM-dd HH:mm:ss")
val formatDate = SDcardFile.format(System.currentTimeMillis())
val filename = "ek"
//message=formatDate
//val file = File("$EXTERNAL_PATH/$formatDate.txt")
val DirFileName = File("$EXTERNAL_PATH/$filename.txt")
if (!DirFileName.exists()) { DirFileName.createNewFile() }
val writer = FileWriter(DirFileName.absolutePath)
val buffer = BufferedWriter(writer)
buffer.write(message)
buffer.close()
Toast.makeText(applicationContext, "direct_saveBT:$formatDate", Toast.LENGTH_LONG).show()
}
if(view?.id==R.id.external_saveBT){
val dataET = findViewById<EditText>(R.id.dataET)
val file = File(dir)
if (!file.exists()) {
file.mkdirs()
}
var output = FileOutputStream(dir+ "/sdkfile.txt")
var dos = DataOutputStream(output)
var readMessage:String = dataET.text.toString()
dos.writeUTF(readMessage)
dos.flush()
dos.close()
Toast.makeText(applicationContext, "external_saveBT", Toast.LENGTH_LONG).show()
}
if(view?.id==R.id.external_loadBT){
val dataTV = findViewById<TextView>(R.id.tv_output)
var input = FileInputStream(dir + "/sdkfile.txt")
var dis = DataInputStream(input)
var valueUTF = dis.readUTF()
dis.close()
dataTV.text = valueUTF
Toast.makeText(applicationContext, "Read message", Toast.LENGTH_LONG).show()
}
}
}
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AndroidManifest.xml
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<!-- 외부 저장소 읽기 권한 -->
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<!-- 외부 저장소 쓰기 권한 -->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
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