Android Tutorials: Creating TextFile Dynamically and using in Android

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Package Name : selva.file

Project Name : File1

Version : 1.5 ( Supports 1.5 and above versions)

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >
    <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" />
    <EditText
    android:id="@+id/txtText2"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" />
    <Button
    android:id="@+id/btnLoad"
    android:text="Load"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" />
</LinearLayout>

File1Activity.java

package selva.file;

import android.app.Activity;
import android.os.Bundle;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class File1Activity extends Activity
{
    private EditText textBox,textBox1;
    private static final int READ_BLOCK_SIZE = 100;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
       textBox = (EditText) findViewById(R.id.txtText1);
       textBox1 = (EditText) findViewById(R.id.txtText2);
       Button saveBtn = (Button) findViewById(R.id.btnSave);
       Button loadBtn = (Button) findViewById(R.id.btnLoad);
       saveBtn.setOnClickListener(new View.OnClickListener()
           {
           public void onClick(View v)
           {
               String str = textBox.getText().toString();
               try
               {
                   FileOutputStream fOut =openFileOutput("textfile.txt",MODE_WORLD_READABLE);
                   OutputStreamWriter osw = new OutputStreamWriter(fOut);
                   //---write the string to the file---
                   osw.write(str);
                   osw.flush();
                   osw.close();
                   //---display file saved message---
                   Toast.makeText(getBaseContext(),"File saved successfully!",Toast.LENGTH_SHORT).show();
                   //---clears the EditText---
                   textBox.setText("");
               }
               catch (IOException ioe)
               {
                   ioe.printStackTrace();
               }
           }
           });
       loadBtn.setOnClickListener(new View.OnClickListener()
       {
           public void onClick(View v)
           {
               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)
                   {
                       //---convert the chars to a String---
                       String readString =String.copyValueOf(inputBuffer, 0,charRead);
                       s += readString;
                       inputBuffer = new char[READ_BLOCK_SIZE];
                   }
                   //---set the EditText to the text that has been
                   // read---
                   textBox1.setText(s);
                   Toast.makeText(getBaseContext(),"File loaded successfully!",Toast.LENGTH_SHORT).show();
               }
               catch (IOException ioe)
               {
                   ioe.printStackTrace();
               }
           }
       });
    }
}