안드로이드 - sdcard 사용하기 예제

외부 저장 장치를 사용하기 위하여 uses-permission을 추가
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>

public class ExternalStorageTest extends Activity {

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

@Override

public void onCreate(Bundle savedInstanceState) {

   super.onCreate(savedInstanceState);

   TextView textView = new TextView(this); 

   setContentView(textView); 

   

   String state = Environment.getExternalStorageState();

   if(!state.equals(Environment.MEDIA_MOUNTED)){

    textView.setText("외부 저장 장치가 없습니다.");

   } else {

    File externalDir = Environment.getExternalStorageDirectory();

    File textFile = new File(externalDir.getAbsolutePath()+File.separator+"text.txt");

    try{

    writeTextFile(textFile,"테스트 입니다.");

    String text = readTextFile(textFile);

    textView.setText(text); 

    if(!textFile.delete()){

    textView.setText("임시파일을 삭제 할 수 없습니다.");

    }

    } catch(IOException e){

    textView.setText("에러:"+e.getMessage());

    }

   }

   

}

private void writeTextFile(File file, String text)throws IOException{

BufferedWriter writer = new BufferedWriter(new FileWriter(file));

writer.write(text);

writer.close();

}

private String readTextFile(File file)throws IOException{

BufferedReader reader = new BufferedReader(new FileReader(file));

StringBuilder text = new StringBuilder();

String line;

while((line=reader.readLine())!= null){

text.append(line);

text.append("\n");

}

reader.close();

return text.toString();

}

}