Android---5---saving and echoing data

Do a simple QQ landing interface, the ability to save the account number and password to the phone, and start the program again will automatically display the last saved account and password.

Activitymain.xml:

<linearlayout xmlns:android= "http://schemas.android.com/apk/res/android" xmlns:tools= "http// Schemas.android.com/tools "android:layout_width=" fill_parent "android:layout_height=" Fill_parent "Android:orienta tion= "vertical" android:paddingbottom= "@dimen/activity_vertical_margin" android:paddingleft= "@dimen/activity_ Horizontal_margin "android:paddingright=" @dimen/activity_horizontal_margin "android:paddingtop=" @dimen/activity_ Vertical_margin "tools:context=" com.example.qqlogin.MainActivity "> <edittext android:layout_width=" fill_p Arent "android:layout_height=" wrap_content "android:id=" @+id/number "android:hint=" QQ number/Mobile phone number/mailbox "/&G     T;<edittext android:layout_width= "fill_parent" android:layout_height= "wrap_content" android:id= "@+id/psw"        Android:inputtype= "Textpassword" android:hint= "password"/><checkbox android:layout_width= "Wrap_content" android:layout_height= "Wrap_content" Android:text= "Remember Password" android:checked= "true" android:id= "@+id/remember"/><button android:layout_width= "wrap _content "android:layout_height=" wrap_content "android:id=" @+id/login "android:text=" Login "/></LinearLayou T>

Mainactivity.java

Package Com.example.qqlogin;import Java.util.map;import Com.example.qqlogin.utils.utils;import Android.app.activity;import Android.os.bundle;import Android.text.textutils;import Android.util.Log;import Android.view.menu;import Android.view.menuitem;import Android.view.view;import Android.view.View.OnClickListener; Import Android.widget.button;import Android.widget.checkbox;import Android.widget.edittext;import android.widget.toast;/** * * @author Caesar * */public class Mainactivity extends Activity implements Onclicklistener {PR Ivate EditText numbertext;private EditText pswtext;private Button button;private CheckBox cb;protected void OnCreate ( Bundle savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview (r.layout.activity_main); numberText = (EditText) Findviewbyid (r.id.number);p Swtext = (EditText) Findviewbyid (R.ID.PSW); cb = (CheckBox) Findviewbyid ( R.id.remember); button = (button) Findviewbyid (R.id.login); Button.setonclicklistener (this);//Echo Data map<string, string> uSerinfomap = Utils. GetUserInfo (this), if (userinfomap! = null) {Numbertext.settext (Userinfomap.get ("number"));p Swtext.settext ( Userinfomap.get ("PSW"));}} public void OnClick (View v) {String number = Numbertext.gettext (). toString (); String PSW = Pswtext.gettext (). toString (); String Info = "Account" + number + "password" + PSW; Toast.maketext (this, Info, 0). Show (); if (textutils.isempty (number) | | Textutils.isempty (PSW)) {Toast.maketext (this, "Please fill in correctly", 0). Show (); if (cb.ischecked ()) {if (utils). Saveuserinfo (This,number, PSW)) Toast.maketext (this, "Save succeeded", 0). Show (); else {Toast.maketext (this, "Save Failed", 0). Show ();}} Toast.maketext (This, "Login succeeded", 1). Show ();}}

Utils.java

Package Com.example.qqlogin.utils;import Java.io.bufferedreader;import Java.io.file;import Java.io.FileInputStream ; Import Java.io.filenotfoundexception;import Java.io.fileoutputstream;import Java.io.inputstreamreader;import Java.io.outputstream;import java.util.hashmap;import java.util.map;import Android.*;import android.content.Context Import android.text.textutils;import android.widget.toast;/** * Phone memory file read * @author Caesar * */public class Utils {/** * Save file to Phone memory * @param context * @param number * @param PSW * @return */public Static Boolean Saveuserinfo (context context, St Ring number,string PSW) {try {File filedir = Context.getfilesdir (); File F = new file (Filedir, "data.txt"); FileOutputStream Fos;fos = new FileOutputStream (f); String data = number + "# #" + Psw;fos.write (Data.getbytes ()); Fos.flush (); Fos.close (); return true;} catch (Exception e) {//TODO auto-generated catch Blocke.printstacktrace ();} return false;} /** * Read from phone memory * @param context * @return */public static map<string,String> GetUserInfo (Context context) {try {File filedir = Context.getfilesdir (); File F = new file (Filedir, "data.txt"); FileInputStream Fis;fis = new FileInputStream (f); BufferedReader reader = new BufferedReader (new InputStreamReader (FIS)); string text = Reader.readline (), if (!text.isempty ()) {String split[] = Text.split ("# #"); map<string, string> userinfomap = new hashmap<string, string> (); Userinfomap.put ("number", split[0]); Userinfomap.put ("PSW", split[1]); return userinfomap;}} catch (Exception e) {//TODO auto-generated catch Blocke.printstacktrace ();} return null;}}

Android---5---saving and echoing data