Save to External Storage (SD Card)

<?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="Please enter some text" />

 <EditText
     android:id="@+id/txtText1"
     android:layout_width="fill_parent"
     android:layout_height="wrap_content" />

 <Button
     android:id="@+id/btnSave"
     android:text="Save"
     android:layout_width="fill_parent"
     android:layout_height="wrap_content"
     android:onClick="onClickSave" />

 <Button
     android:id="@+id/btnLoad"
     android:text="Load"
     android:layout_width="fill_parent"
     android:layout_height="wrap_content"
     android:onClick="onClickLoad" />

</LinearLayout>

package com.java2s.myapplication3.app;
//from  www  .  ja  v  a2  s.c  o m
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

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

public class MainActivity extends Activity {
    EditText textBox;
    static final int READ_BLOCK_SIZE = 100;

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

        textBox = (EditText) findViewById(R.id.txtText1);
    }

    public void onClickSave(View view) {
        String str = textBox.getText().toString();
        try
        {
            FileOutputStream fOut =
                    openFileOutput("textfile.txt",
                            MODE_WORLD_READABLE);
            OutputStreamWriter osw = new
                    OutputStreamWriter(fOut);
            osw.write(str);
            osw.flush();
            osw.close();
            Toast.makeText (getBaseContext(),
                    "File saved successfully!",
                    Toast.LENGTH_SHORT).show();
            textBox.setText("");
        }
        catch (IOException ioe)
        {
            ioe.printStackTrace();
        }
    }
    public void onClickLoad(View view) {
        try{
            FileInputStream fIn =
                    openFileInput("textfile.txt");
            InputStreamReader isr = new
                    InputStreamReader(fIn);

            char [] inputBuffer = new char [READ_BLOCK_SIZE];
            String s = "";

            int charRead;
            while ((charRead = isr.read(inputBuffer))>0)
            {
                String readString =
                        String.copyValueOf(inputBuffer, 0,
                                charRead);
                s += readString;

                inputBuffer = new char [READ_BLOCK_SIZE];
            }
            textBox.setText(s);
            Toast.makeText (getBaseContext(),
                    "File loaded successfully!",
                    Toast.LENGTH_SHORT).show();
        }
        catch (IOException ioe) {
            ioe.printStackTrace();
        }
    }
}