android--file read/write

Package Com.zx.filedemo2;

Import Java.io.ByteArrayOutputStream;
Import Java.io.FileInputStream;
Import java.io.FileNotFoundException;
Import Java.io.FileOutputStream;
Import java.io.IOException;

Import android.app.Activity;
Import Android.os.Bundle;
Import Android.view.Menu;
Import Android.view.MenuItem;
Import Android.view.View;
Import Android.view.View.OnClickListener;
Import Android.widget.Button;
Import Android.widget.EditText;
Import Android.widget.TextView;

public class Mainactivity extends Activity {
Private TextView TextView;
Private Button Btnbutton;
Private EditText EditText;

@Override
protected void OnCreate (Bundle savedinstancestate) {
Super.oncreate (savedinstancestate);
Setcontentview (R.layout.activity_main);

textview= (TextView) Findviewbyid (R.ID.TEXTVIEW1);
btnbutton= (Button) Findviewbyid (R.id.button1);
edittext= (EditText) Findviewbyid (R.ID.EDITTEXT1);

Btnbutton.setonclicklistener (New Onclicklistener () {

@Override
public void OnClick (View v) {
TODO auto-generated method stubs
Writedate (Edittext.gettext (). toString ());
Textview.settext (Readdate ());
}
});
}

public void Writedate (String contentstring) {
try {
FileOutputStream stream = Openfileoutput ("A.txt", mode_private);
Stream.Write (Contentstring.getbytes ());
Stream.Close ();
} catch (FileNotFoundException e) {
TODO Auto-generated catch block
E.printstacktrace ();
} catch (IOException e) {
TODO Auto-generated catch block
E.printstacktrace ();
}
}

Public String readdate () {
String Str=null;
try {
FileInputStream stream = Openfileinput ("A.txt");
Bytearrayoutputstream BAOs = new Bytearrayoutputstream ();
byte[] buffer = new byte[1024];
int len = 0;
while (len = stream.read (buffer))!=-1) {
Baos.write (Buffer,0,len);
}
str = baos.tostring ();
Baos.close ();
Stream.Close ();
} catch (FileNotFoundException e) {
TODO Auto-generated catch block
E.printstacktrace ();
} catch (IOException e) {
TODO Auto-generated catch block
E.printstacktrace ();
}

return str;
}

@Override
public boolean Oncreateoptionsmenu (Menu menu) {
Inflate the menu; This adds items to the action bar if it is present.
Getmenuinflater (). Inflate (R.menu.main, menu);
return true;
}

@Override
public boolean onoptionsitemselected (MenuItem item) {
Handle Action Bar Item clicks here. The Action Bar would
Automatically handle clicks on the Home/up button, so long
As you specify a the parent activity in Androidmanifest.xml.
int id = item.getitemid ();
if (id = = r.id.action_settings) {
return true;
}
return super.onoptionsitemselected (item);
}
}

android--file read/write