Storage and reading of Android small notes

One, the preservation of data----system

Btn_ok.setonclicklistener (New Onclicklistener () {

@Override

public void OnClick (View v) {

String user = Et_user.gettext (). toString (). Trim ();

String pwd = Et_pwd.gettext (). toString (). Trim ();

if (User.isempty () | | | Pwd.isempty ()) {

Toast.maketext (Getapplicationcontext (), "cannot Be Empty", (). Show ();

}else{

String name= "Data.txt";

String content=user+ "=" +PWD;

try {

FileOutputStream fos=openfileoutput (name, mode_private);

Fos.write (Content.getbytes ());

Fos.close ();

Toast.maketext (Getapplicationcontext (), "saved successfully", "()"). Show ();

} catch (Exception e) {

TODO auto-generated Catch block

E.printstacktrace ();

}

}

}

});

the reading of the data----system

Btn_show.setonclicklistener (New Onclicklistener () {

@Override

public void OnClick (View v) {

String name= "Data.txt";

try {

FileInputStream fis=openfileinput (name);

BufferedReader br=new BufferedReader (New InputStreamReader (FIS));

Reading data from a document

String content = Br.readline ();

Splitting a string

string[] STRs = content.split ("=");

The displayed data

if (!content.isempty ()) {

Et_user.settext (Strs[0]);

Et_pwd.settext (Strs[1]);

}

} catch (Exception e) {

TODO auto-generated Catch block

E.printstacktrace ();

}

}

});

second, data storage----memory card

File File=new file (Environment.getexternalstoragedirectory (), name);

try {

FileOutputStream fos=new fileoutputstream (file);

Fos.write (Content.getbytes ());

Fos.close ();

Toast.maketext (Getapplicationcontext (), "saved successfully", "()"). Show ();

} catch (Exception e) {

Toast.maketext (Getapplicationcontext (), "Save Failed", $). Show ();

E.printstacktrace ();

}

Data read----memory card

File File=new file (Environment.getexternalstoragedirectory (), name);

try {

FileOutputStream fos=new fileoutputstream (file);

Fos.write (Content.getbytes ());

Fos.close ();

Toast.maketext (Getapplicationcontext (), "saved successfully", "()"). Show ();

} catch (Exception e) {

Toast.maketext (Getapplicationcontext (), "Save Failed", $). Show ();

E.printstacktrace ();

}

Third, sharedprefrence (☆☆☆ ☆)

//Save

Btn_ok.setonclicklistener (New Onclicklistener () {

@Override

public void OnClick (View v) {

String user = Et_user.gettext (). toString (). Trim ();

String pwd = Et_pwd.gettext (). toString (). Trim ();

if (User.isempty () | | | Pwd.isempty ()) {

Toast.maketext (Getapplicationcontext (), "cannot Be Empty", (). Show ();

Get editor

Editor edit = Sp.edit ();

Save data

Edit.putstring ("name", user);

Edit.putstring ("pwd", PWD);

//Submit Save

Edit.commit ();

}

}

});

// read

Btn_show.setonclicklistener (New Onclicklistener () {

@Override

public void OnClick (View v) {

Get user Name

String user = sp.getstring ("name", null);

Get password

String pwd= sp.getstring ("pwd", null);

//Display

Et_user.settext (user);

Et_pwd.settext (PWD);

}

});

This article is from the "Android Small Notes" blog, please be sure to keep this source http://dreamwing.blog.51cto.com/9872128/1611293

Storage and reading of Android small notes