Copy Coding

플랫폼 버전

API 레벨

플랫폼 명

버전 코드

Android 10.0

29

Q

Q

Android 9

28

Pie

P

Android 8.1

27

Oreo

O_MR1

Android 8.0

26

Oreo

O

Android 7.1.1

Android 7.1

25

Nougat

N_MR1

Android 7.0

24

Nougat

N

Android 6.0

23

Marshmallow

M

Android 5.1

22

Lollipop

LOLLIPOP_MR1

Android 5.0

21

Lollipop

LOLLIPOP

Android 4.4W

20

KitKat Wear

KITKAT_WATCH

Android 4.4

19

KitKat

KITKAT

Android 4.3

18

Jelly Bean

JELLY_BEAN_MR2

Android 4.2

Android 4.2.2

17

Jelly Bean

JELLY_BEAN_MR1

Android 4.1

Android 4.1.1

16

Jelly Bean

JELLY_BEAN

Android 4.0.3

Android 4.0.4

15

IceCreamSandwich

ICE_CREAM_SANDWICH_MR1

Android 4.0

Android 4.0.1

Android 4.0.2

14

IceCreamSandwich

ICE_CREAM_SANDWICH

Android 3.2

13

Honeycomb

HONEYCOMB_MR2

Android 3.1.x

12

Honeycomb

HONEYCOMB_MR1

Android 3.0.x

11

Honeycomb

HONEYCOMB

Android 2.3.4

Android 2.3.3

10

Gingerbread

GINGERBREAD_MR1

Android 2.3.2

Android 2.3.1

Android 2.3

9

Gingerbread

GINGERBREAD

Android 2.2.x

8

Froyo

FROYO

Android 2.1.x

7

Eclair

ECLAIR_MR1

Android 2.0.1

6

Eclair

ECLAIR_0_1

Android 2.0

5

Eclair

ECLAIR

Android 1.6

4

Donut

DONUT

Android 1.5

3

Cupcake

CUPCAKE

Android 1.1

2

Base

BASE_1_1

Android 1.0

1

Base

BASE

Return Type

Code

Description

String

BASE_OS

The base OS build the product is based on.

String

CODENAME

The current development codename, or the string "REL" if this is a release build.

String

INCREMENTAL

The internal value used by the underlying source control to represent this build.

String

PREVIEW_SDK_INT

The developer preview revision of a prerelease SDK.

String

RELEASE

The user-visible version string.

String

RELEASE_OR_CODENAME

The version string we show to the user; may be RELEASE or CODENAME if not a final release build.

String

SDK

This field was deprecated in API level 15. Use SDK_INT to easily get this as an integer.

String

SDK_INT

The SDK version of the software currently running on this hardware device.

String

SECURITY_PATCH

The user-visible security patch level.

public class MainActivity extends AppCompatActivity {

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

        TextView textView = (TextView) findViewById(R.id.version);
        StringBuffer sBuffer = new StringBuffer();
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            sBuffer.append("Build.VERSION.BASE_OS = " + Build.VERSION.BASE_OS);
            Log.v("myDevice","Build.VERSION.BASE_OS = " + Build.VERSION.BASE_OS);
        }
        Log.v("myDevice","Build.VERSION.CODENAME = " + Build.VERSION.CODENAME);
        Log.v("myDevice","Build.VERSION.INCREMENTAL = " + Build.VERSION.INCREMENTAL);
        Log.v("myDevice","Build.VERSION.RELEASE = " + Build.VERSION.RELEASE);
        Log.v("myDevice","Build.VERSION.SDK = " + Build.VERSION.SDK);
        Log.v("myDevice","Build.VERSION.SDK_INT = " + Build.VERSION.SDK_INT);
        sBuffer.append("\nBuild.VERSION.CODENAME = " + Build.VERSION.CODENAME);
        sBuffer.append("\nBuild.VERSION.INCREMENTAL = " + Build.VERSION.INCREMENTAL);
        sBuffer.append("\nBuild.VERSION.RELEASE = " + Build.VERSION.RELEASE);
        sBuffer.append("\nBuild.VERSION.SDK = " + Build.VERSION.SDK);
        sBuffer.append("\nBuild.VERSION.SDK_INT = " + Build.VERSION.SDK_INT);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            sBuffer.append("\nBuild.VERSION.SECURITY_PATCH = " + Build.VERSION.SECURITY_PATCH);
            Log.v("myDevice","Build.VERSION.SECURITY_PATCH = " + Build.VERSION.SECURITY_PATCH);
        }
        textView.setText(sBuffer);
    }
}

<TextView

        android:id="@+id/fileContents"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="Hello World!"

        app:layout_constraintBottom_toBottomOf="parent"

        app:layout_constraintLeft_toLeftOf="parent"

        app:layout_constraintRight_toRightOf="parent"

        app:layout_constraintTop_toTopOf="parent" />

    <Button

        android:id="@+id/button"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_marginStart="76dp"

        android:layout_marginLeft="76dp"

        android:layout_marginTop="108dp"

        android:text="Button"

        app:layout_constraintStart_toStartOf="parent"

        app:layout_constraintTop_toTopOf="parent"

        android:onClick="btnClick"/>

public void btnClick(View view) {

try {

writeFile("testFile.txt", "testtttttttt");

            String rFile = readFile("testFile.txt");

            textView.setText(rFile);

        } catch (IOException e) {

            e.printStackTrace();

        }

}

OutputStreamWriter oStreamWriter = new OutputStreamWriter(openFileOutput(fileName,

                    Context.MODE_PRIVATE));

oStreamWriter.write(msg);

oStreamWriter.close();

InputStream iStream = openFileInput(fileName);

if(iStream != null) {

InputStreamReader iStreamReader = new InputStreamReader(iStream);

    BufferedReader bufferedReader = new BufferedReader(iStreamReader);

    String temp = "";

    StringBuffer sBuffer = new StringBuffer();

    while((temp = bufferedReader.readLine()) != null) {

         sBuffer.append(temp);

}

iStream.close();

fileContents = sBuffer.toString();

<?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"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/fileContents"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="76dp"
        android:layout_marginLeft="76dp"
        android:layout_marginTop="108dp"
        android:text="Button"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        android:onClick="btnClick"/>

</androidx.constraintlayout.widget.ConstraintLayout>

package copycoding.tistory.filetest;

import androidx.appcompat.app.AppCompatActivity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
 

public class MainActivity extends AppCompatActivity {

    TextView textView;

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

        textView = (TextView) findViewById(R.id.fileContents);
    }

    private void writeFile(String fileName, String msg) {
        try {
            OutputStreamWriter oStreamWriter = new OutputStreamWriter(openFileOutput(fileName,
                    Context.MODE_PRIVATE));
            oStreamWriter.write(msg);
            oStreamWriter.close();
        } catch(FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
  
    private String readFile(String fileName) throws IOException {
        String fileContents = "";
        try {
            InputStream iStream = openFileInput(fileName);
            if(iStream != null) {
                InputStreamReader iStreamReader = new InputStreamReader(iStream);
                BufferedReader bufferedReader = new BufferedReader(iStreamReader);
                String temp = "";
                StringBuffer sBuffer = new StringBuffer();
                while((temp = bufferedReader.readLine()) != null) {
                    sBuffer.append(temp);
                }
                iStream.close();
                fileContents = sBuffer.toString();
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        return fileContents;
    }
  

    public void btnClick(View view) {
        try {
            writeFile("testFile.txt", "testtttttttt");
            String rFile = readFile("testFile.txt");
            textView.setText(rFile);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}