Shared storage of Android learning notes data sharedpreferences

(1) Layout file, a simple login file;

<relativelayout xmlns:android= "http://schemas.android.com/apk/res/android" xmlns:tools= "http// Schemas.android.com/tools "android:layout_width=" match_parent "android:layout_height=" Match_parent "Android:paddi ngbottom= "@dimen/activity_vertical_margin" android:paddingleft= "@dimen/activity_horizontal_margin" Android: paddingright= "@dimen/activity_horizontal_margin" android:paddingtop= "@dimen/activity_vertical_margin" tools: Context= ". Mainactivity "> <textview android:id=" @+id/textview1 "android:layout_width=" Wrap_content "an droid:layout_height= "Wrap_content" android:layout_alignparentleft= "true" android:layout_alignparenttop= "true "Android:layout_marginleft=" 22DP "android:layout_margintop=" 22DP "android:text=" User name: "/> <e Dittext android:id= "@+id/edittext1" android:layout_width= "wrap_content" android:layout_height= "Wrap_c Ontent "Android:layout_alignbaseline=" @+id/teXtView1 "android:layout_alignbottom=" @+id/textview1 "android:layout_torightof=" @+id/textview1 "Androi d:ems= "Ten"/> <textview android:id= "@+id/textview2" android:layout_width= "Wrap_content" Android oid:layout_height= "Wrap_content" android:layout_alignright= "@+id/textview1" android:layout_below= "@+id/editT Ext1 "android:layout_margintop=" 17DP "android:text=" Password: "/> <edittext android:id=" @+id/editt Ext2 "android:layout_width=" wrap_content "android:layout_height=" Wrap_content "Android:layout_alignle ft= "@+id/edittext1" android:layout_below= "@+id/edittext1" android:ems= "android:inputtype=" TextPas Sword "> <requestfocus/> </EditText> <button android:id=" @+id/button2 "Andro        Id:layout_width= "Wrap_content" android:layout_height= "wrap_content" android:layout_below= "@+id/checkBox1" Android:layout_marginleft= "34DP" android:layout_margintop= "32DP" android:layout_torightof= "@+id/button1" android:text= "fetch "/> <checkbox android:id=" @+id/checkbox1 "android:layout_width=" Wrap_content "Android:layo"        ut_height= "Wrap_content" android:layout_alignleft= "@+id/textview1" android:layout_below= "@+id/editText2"        android:layout_margintop= "22DP" android:text= "Remember user name"/> <button android:id= "@+id/button1" Android:layout_width= "Wrap_content" android:layout_height= "wrap_content" android:layout_alignbaseline= "@+i D/button2 "android:layout_alignbottom=" @+id/button2 "android:layout_alignleft=" @+id/edittext2 "Androi d:text= "Login"/> <checkbox android:id= "@+id/checkbox2" android:layout_width= "Wrap_content" and roid:layout_height= "Wrap_content" android:layout_alignbaseline= "@+id/checkbox1" android:layout_alignbottom= " @+id/checkbox1 "Android:layout_marginleft= "14DP" android:layout_torightof= "@+id/button1" android:text= "Mute Login"/></Relati Velayout>

(2) directory structure:

(3) Sharedpreferences Tool class Loginservice.java

Package Com.lc.data_storage_share.sharepreference;import Java.util.map;import Android.content.context;import Android.content.sharedpreferences;import Android.content.sharedpreferences.editor;public class LoginService { Private context context; Context Public Loginservice (context context) {This.context = context;} /* Save login Information */public boolean saveloginmsg (string name, String password) {Boolean flag = false;//do not add suffix, the system is automatically saved in. xml format//This Login is the file name to be stored sharedpreferences preferences = context.getsharedpreferences ("Login", context. Mode_private + context. Mode_append); Editor editor = Preferences.edit (); editor.putstring ("name", name), editor.putstring ("password", password); flag = Editor.commit (); return flag;} /* * Save File */public boolean savesharepreference (String filename, map<string, object> Map) {Boolean flag = false; Sharedpreferences preferences = context.getsharedpreferences (filename,context.mode_private);/* * Use editor when saving data Editor editor = Preferences.edit (); for (map.entry<string, OBJECT> Entry:map.entrySet ()) {String key = Entry.getkey (); Object object = Entry.getvalue (); if (Object instanceof Boolean) {Boolean new_name = (Boolean) Object;editor.putboolean (key, new_name);} else if (object instanceof Integer) {integer integer = (integer) object;editor.putint (key, Integer);} else if (Object inst anceof float) {float F = (float) object;editor.putfloat (key, f);} else if (object instanceof Long) {Long L = (long) object ; Editor.putlong (key, L);} else if (object instanceof String) {string s = (string) object;editor.putstring (key, s);}} Flag = Editor.commit (); return flag;} /* * Read file */public map<string,?> getsharepreference (String filename) {map<string,?> Map = null; Sharedpreferences preferences = context.getsharedpreferences (filename,context.mode_private);/* * Read data when hungry only need to access */ Map = Preferences.getall (); return map;}}

(3) Mainactivity.java

Package Com.lc.data_storage_share;import Java.util.hashmap;import Java.util.map;import Com.example.data_storage_ Share. R;import Com.lc.data_storage_share.sharepreference.loginservice;import Android.os.bundle;import Android.app.activity;import Android.view.menu;import Android.view.view;import Android.view.View.OnClickListener; Import android.widget.button;import android.widget.checkbox;import android.widget.edittext;/* * unit tests need to be in the manifest file */ public class Mainactivity extends Activity {private button button1;//login private button button2;//Cancel private EditText Editt Ext1, edittext2;private checkbox checkbox1;//Remember password private CheckBox checkBox2; Mute Login Private Loginservice service; map<string,?> map = null, @Overrideprotected void OnCreate (Bundle savedinstancestate) {super.oncreate ( Savedinstancestate); Setcontentview (r.layout.activity_main); button1 = (Button) This.findviewbyid (R.id.button1); Button2 = (Button) This.findviewbyid (r.id.button2); editText1 = (EditText) This.findviewbyid (r.id.edittext1); editText2 = (EditText) This.findviewbyid (r.id.edittext2); checkBox1 = (CheckBox) This.findviewbyid (r.id.checkbox1); CheckBox2 = (CheckBox) This.findviewbyid (r.id.checkbox2); service = new Loginservice (this); map = Service.getsharepreference ("Login"), if (map! = null &&!map.isempty ()) {Edittext1.settext (Map.get ("username" ). ToString ()), Checkbox1.setchecked ((Boolean) Map.get ("Isname")), Checkbox2.setchecked ((Boolean) Map.get ("Isquiet" ));} Button1.setonclicklistener (New Onclicklistener () {@Overridepublic void OnClick (View v) {//TODO auto-generated method Stubif (Edittext1.gettext (). toString (). Trim (). Equals ("admin")) {map<string, object> map1 = new hashmap< String, object> (), if (checkbox1.ischecked ()) {Map1.put ("username", Edittext1.gettext (). toString (). Trim ());} else {map1.put ("username", "");} Map1.put ("Isname", checkbox1.ischecked ()), Map1.put ("Isquiet", checkbox2.ischecked ()); service.savesharepreference ("Login", MAP1);}}); @Overridepublic Boolean Oncreateoptionsmenu (Menumenu) {//Inflate the menu; This adds items to the action bar if it is present.getmenuinflater (). Inflate (R.menu.main, menu ); return true;}}

(4) Test class:

Package Com.lc.data_storage_share;import Java.util.hashmap;import Java.util.map;import Android.test.androidtestcase;import Android.util.log;import Com.lc.data_storage_ Share.sharepreference.loginservice;public class MyTest extends Androidtestcase {private final String TAG = "MyTest"; Public MyTest () {//TODO auto-generated constructor stub}/* * Login */public void Save () {Loginservice service = new Loginser Vice (GetContext ()); Boolean flag = Service.saveloginmsg ("admin", "123"); LOG.I (TAG, "-->>" + flag);} /* * Save file */public void SaveFile () {Loginservice service = new Loginservice (GetContext ()); map<string, object> map = new hashmap<string, object> (); Map.put ("Name", "Jack"); Map.put ("Age", at a); map.put ("Salary", 23000.0f); Map.put ("id", 1256423132l); Map.put ("Ismanager", true); Boolean flag = Service.savesharepreference ("MSG", map); LOG.I (TAG, "-->>" + flag);} /* * Read file */public void ReadFile () {Loginservice service = new Loginservice (GetContext ()); map<string,?> map = SerVice.getsharepreference ("msg"); LOG.I (TAG, "-->>" + map.get ("name")); LOG.I (TAG, "-->>" + map.get ("age")); LOG.I (TAG, "-->>" + map.get ("salary")); LOG.I (TAG, "-->>" + map.get ("Ismanager")); LOG.I (TAG, "-->>" + map.get ("id"));}}

How to add JUnit test units:

1. Add the following in the manifest file:

2. Add in Application:

3. Test class mytest to inherit Androidtestcase

(5) As a result, the next time you log in will remember the user name

Shared storage of Android learning notes data sharedpreferences