Android: Data Storage Using Internal Storage

Here we will use the file handling technique that is in java. The screenshots of the output f this program is given below.

Source Code
So here we go for the main activity.


package com.ex;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import java.io.FileInputStream;
import java.io.FileOutputStream;

public class IsExample extends Activity implements OnClickListener
{
    Button b1,b2;
    EditText ed1;
    String str="Hi, This is the example of Data Storage Using Internal Storage";
    String filename="readme.txt";
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        b1=(Button)findViewById(R.id.button1);
        b2=(Button)findViewById(R.id.button2);
        ed1=(EditText)findViewById(R.id.edit1);
        b1.setOnClickListener(this);
        b2.setOnClickListener(this);
       
    }

    public void onClick(View arg0) {
        if(arg0==b1){
            try{
                //This command will make file as private internal. It is only visible
                //to your application
                FileOutputStream fos=openFileOutput(filename, Context.MODE_PRIVATE);
                fos.write(str.getBytes());
                fos.close();
                Toast.makeText(this, "File is created", 20000).show();
            }
            catch(Exception e){
               
            }
        }
        if(arg0==b2){
            int i;
       
            try{
                StringBuffer fileContent=new StringBuffer();
            FileInputStream fis=openFileInput(filename);
            while((i=fis.read())!=-1){
                fileContent.append((char)i);
             }
            String data=new String(fileContent);
            ed1.setText(data);
            fis.close();
            }
            catch(Exception e){
               
            }
        }
           
    }
}

For layout main.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout

android:id="@+id/widget31"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:orientation="vertical"

xmlns:android="http://schemas.android.com/apk/res/android"

>

<Button

android:id="@+id/button1"

android:layout_width="320px"

android:layout_height="wrap_content"

android:text="save"

>

</Button>

<Button

android:id="@+id/button2"

android:layout_width="320px"

android:layout_height="wrap_content"

android:text="open"

>

</Button>

<EditText

android:id="@+id/edit1"

android:layout_width="319px"

android:layout_height="52px"

android:textSize="18sp"

>

</EditText>

</LinearLayout>