android sdcard

 

 

package xiao.huang;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.Toast;

public class StorageActivity extends Activity {
private static final String FILENAME = "test.txt";
private EditText mText;
private CheckBox checkExternal;

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

checkExternal = (CheckBox) findViewById(R.id.checkExternal);
mText = (EditText) findViewById(R.id.text);
}

public void onClickSave(View v) throws IOException {
if (checkExternal.isChecked())
saveToExternal(mText.getText().toString());
else
saveToInternal(mText.getText().toString());
}

public void onClickLoad(View v) throws IOException {
if (checkExternal.isChecked())
mText.setText(loadFromExternal());
else
mText.setText(loadFromInternal());
}

private void saveToInternal(String text) throws IOException {
FileOutputStream fos = openFileOutput(FILENAME, MODE_PRIVATE);
fos.write(text.getBytes());
fos.close();
}

private CharSequence loadFromInternal() throws IOException {
StringBuffer readed = new StringBuffer();
int ch;
FileInputStream fis = openFileInput(FILENAME);
while ((ch = fis.read()) != -1)
readed.append((char)ch);
fis.close();
return readed.toString();
}

private void saveToExternal(String text) throws IOException {
String state = Environment.getExternalStorageState();
if (state.equals(Environment.MEDIA_MOUNTED)) {
File dir = Environment.getExternalStorageDirectory();
File file = new File(dir, FILENAME);
FileOutputStream fos = new FileOutputStream(file);
fos.write(text.getBytes());
fos.close();
}
else {
Toast.makeText(this, "SD카드가 연결되지 않았습니다.", Toast.LENGTH_SHORT);
}
}

private CharSequence loadFromExternal() throws IOException {
String state = Environment.getExternalStorageState();
StringBuffer readed = new StringBuffer();
if (state.equals(Environment.MEDIA_MOUNTED)) {
int ch;
File dir = Environment.getExternalStorageDirectory();
File file = new File(dir, FILENAME);
FileInputStream fis = new FileInputStream(file);
while ((ch = fis.read()) != -1)
readed.append((char)ch);
fis.close();
}
else {
Toast.makeText(this, "SD카드가 연결되지 않았습니다.", Toast.LENGTH_SHORT);
}
return readed.toString();
}
}