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To save data into file in an android application, you have to follow the steps given bellow. 1. Create an object of the FileOutputStream class using the openFileOutput method.     Example :                      FileOutputStream fou = openFileOutput("text.txt", MODE_WORLD_READABLE);        Here text.txt is the name of the file. You can use any of the file opening mode    a.    MODE_PRIVATE  :  File is accessible by only the application that create it.    b.    MODE_APPEND :  Appending an existing file.    c.    MODE_WORLD_WRITABLE : Allow write permission to all the applications.  2. Get an object of the OutPutStreamWriter class using the FileOutputStream object.     Example:                  OutputStreamWriter osw = new OutputStreamWriter(fou); 3. Writ...

Watch this on YouTube MainActivity.java package com.registerevent; import android.app.Activity; import android.os.Bundle; import android.view.Menu; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.Toast; public class MainActivity extends Activity { Button b1, b2; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); b1 = (Button) findViewById(R.id.button1); b2 = (Button) findViewById(R.id.button2); b1.setOnClickListener(bListener); b2.setOnClickListener(bListener); } private OnClickListener bListener = new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub String label = ((Button)v).getText().toString(); Toast.makeText(getBaseContext(), "you click" +label, Toast.LENGTH_LONG).show(); } }; @Override public boolean onCreateOptionsMenu(Menu ...