Simple Build How To Read And Write File In Android

In This Example We See How To Read And Write File In Android With The Use
of SharedPrefrence.

In This I Tack Following Controls.

1. Two Button
2.One Edittext
3. One Textview

Following Are The Code For Read And Write File In Android....


[1] Mainactivity.java

package com.demo.file;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;

import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class FilehandlingdemoActivity extends Activity
{
String FileName = "datafile";
Button save,read;
EditText e1;
TextView t1;
String name;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        save =(Button)findViewById(R.id.sbtn);
        read=(Button)findViewById(R.id.rbtn);
        e1=(EditText)findViewById(R.id.editText1);
        t1=(TextView)findViewById(R.id.textView1);
        save.setOnClickListener(new View.OnClickListener()
 {

public void onClick(View v)
 {
// TODO Auto-generated method stub

saveFile();

}


}
);
        read.setOnClickListener(new View.OnClickListener()
 {

public void onClick(View v)
 {
// TODO Auto-generated method stub
readFile();
}


}
);
     
    }
    private void saveFile()
    {
// TODO Auto-generated method stub
    String strname= e1.getText().toString();
    SharedPreferences sp = getSharedPreferences(FileName, Context.MODE_PRIVATE);
    SharedPreferences.Editor e= sp.edit();
    e.putString("name", strname);
    e.commit();
    Toast.makeText(this, "Data Save Successfully", Toast.LENGTH_SHORT).show();
}
    private void readFile()
 {
// TODO Auto-generated method stub
    SharedPreferences sp = getSharedPreferences(FileName, Context.MODE_PRIVATE);
    String defaultvalue ="defaultname";
    String name= sp.getString("name", defaultvalue);
    t1.setText(name);
    Toast.makeText(this,"Data:"+name, Toast.LENGTH_SHORT).show();


}
}

[2] Main.xml File

<?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="@string/hello"
    />
<EditText android:id="@+id/editText1" android:layout_height="wrap_content" android:layout_width="match_parent">
    <requestFocus></requestFocus>
</EditText>
<LinearLayout android:id="@+id/linearLayout1" android:layout_height="wrap_content" android:layout_width="match_parent" android:orientation="vertical">
    <Button android:id="@+id/rbtn" android:layout_height="wrap_content" android:layout_width="wrap_content" android:text="read"></Button>
    <Button android:text="save" android:id="@+id/sbtn" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button>
</LinearLayout>
<TextView android:text="TextView" android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content"></TextView>


</LinearLayout>

Following Are The Output Of Above Program

Output:-