안드로이드 FileIO(directory 저장 sdcard 저장) 예제 따라하기

- Text를 휴대전화 내부 디렉토리 및 sdcard에 저장 시키고 불러오고 삭제하는 간단한 예제이다.
- 이를 이용해서 해당 어플리케이션을 종료 하고도 자료 저장을 용이하게 할 수 있다.

- Java 소스 

public class Ex09_FileIOActivity extends Activity implements OnClickListener {

EditText mEdit;

String mSDPath;

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

mEdit = (EditText) this.findViewById(R.id.edittext1);

Button btn1 = (Button) this.findViewById(R.id.button1);

btn1.setOnClickListener(this);

Button btn2 = (Button) this.findViewById(R.id.button2);

btn2.setOnClickListener(this);

Button btn3 = (Button) this.findViewById(R.id.button3);

btn3.setOnClickListener(this);

Button btn4 = (Button) this.findViewById(R.id.button4);

btn4.setOnClickListener(this);

Button btn5 = (Button) this.findViewById(R.id.button5);

btn5.setOnClickListener(this);

Button btn6 = (Button) this.findViewById(R.id.button6);

btn6.setOnClickListener(this);

String ext = Environment.getExternalStorageState(); // sd 카드 경로

// String에저장

if (ext.equals(Environment.MEDIA_MOUNTED)) {

mSDPath = Environment.getExternalStorageDirectory()

.getAbsolutePath();

} else {

mSDPath = Environment.MEDIA_UNMOUNTED;

}

}

@Override

public void onClick(View arg0) {

// TODO Auto-generated method stub

switch (arg0.getId()) {

case R.id.button1:

try {

FileOutputStream fos = openFileOutput("test.txt",

Context.MODE_WORLD_READABLE);

fos.write(mEdit.getText().toString().getBytes());

mEdit.setText("");

fos.close();

Toast.makeText(this, "write Success", Toast.LENGTH_SHORT)

.show();

} catch (Exception e) {

Toast.makeText(this, "write fail", Toast.LENGTH_SHORT).show();

}

break;

case R.id.button2:// 로드

try {

FileInputStream fis = openFileInput("test.txt");

byte[] data = new byte[fis.available()];

while (fis.read(data) != -1) {

;

}// -1 전체 다읽은거

fis.close();

mEdit.setText(new String(data));// String으로 바꿔서 출력해야함. String생성자

} catch (FileNotFoundException e) {

Toast.makeText(this, "file not found", Toast.LENGTH_SHORT)

.show();

} catch (IOException e) {

// TODO Auto-generated catch block

Toast.makeText(this, "Read Fail", Toast.LENGTH_SHORT).show();

}

break;

case R.id.button3:// 딜리트

if (deleteFile("test.txt")) {

Toast.makeText(this, "delete success", Toast.LENGTH_SHORT)

.show();

} else {

Toast.makeText(this, "delete fail", Toast.LENGTH_SHORT).show();

}

break;

case R.id.button4:// load

try {

InputStream fis = getResources().openRawResource(R.raw.testrow);

byte[] data = new byte[fis.available()];

while (fis.read(data) != -1) {

;

}

fis.close();

mEdit.setText(new String(data));

Toast.makeText(this, "Read Success", Toast.LENGTH_SHORT).show();

} catch (Exception e) {

Toast.makeText(this, "Read Fail", Toast.LENGTH_SHORT).show();

}

break;

case R.id.button5:// sdcard저장

File dir = new File(mSDPath + "/dir");// 디렉토리 다 파일로 취급한다.linux는 /다

dir.mkdir();

File file = new File(mSDPath + "/dir/testsd.txt");

try {

FileOutputStream fos = new FileOutputStream(file);

fos.write(mEdit.getText().toString().getBytes());

fos.close();

Toast.makeText(this, "Write Success", Toast.LENGTH_SHORT)

.show();

} catch (Exception e) {

Toast.makeText(this, "Write fail(SDCard)", Toast.LENGTH_SHORT)

.show();

}

break;

case R.id.button6:

try {

FileInputStream fis = new FileInputStream(mSDPath

+ "/dir/testsd.txt");

byte[] data = new byte[fis.available()];

while (fis.read(data) != -1) {

;

}// -1 전체 다읽은거

fis.close();

mEdit.setText(new String(data));

Toast.makeText(this, "read Success", Toast.LENGTH_SHORT).show();

} catch (FileNotFoundException e) {

Toast.makeText(this, "file not found", Toast.LENGTH_SHORT)

.show();

} catch (IOException e) {

// TODO Auto-generated catch block

Toast.makeText(this, "Read Fail", Toast.LENGTH_SHORT).show();

}

break;

}

}

} 

- xml 소스

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:orientation="vertical" >

    <TextView

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="@string/hello" />

    <Button

        android:id="@+id/button1"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="save a file(package directory)" />

    <Button

        android:id="@+id/button2"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="Load a file(package directory)" />

    <Button

        android:id="@+id/button3"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="Delete a file(package directory)" />

    <Button

        android:id="@+id/button4"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="Load a file (resources)" />

    <Button

        android:id="@+id/button5"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="save a file(SDCard)" />

    <Button

        android:id="@+id/button6"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="Load a file(SDCard)" />

    <EditText

        android:id="@+id/edittext1"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content" />

</LinearLayout>

-실행화면