Android Case 2: Simple login screen and save information

Interface effect:

Layout code:

<LinearLayoutxmlns: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:orientation= "vertical"Tools:context=". Mainactivity " >    <EditTextAndroid:id= "@+id/et_username"Android:layout_width= "Match_parent"Android:layout_height= "Wrap_content"Android:hint= "Please enter user name" />    <EditTextAndroid:id= "@+id/et_userpassword"Android:password= "true"Android:layout_width= "Match_parent"Android:layout_height= "Wrap_content"Android:hint= "Please enter password" />    <RelativelayoutAndroid:layout_width= "Match_parent"Android:layout_height= "Match_parent"Android:layout_margintop= "20DP" >        <CheckBoxAndroid:id= "@+id/cb_ischeck"Android:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:text= "Remember user name password" />        <ButtonAndroid:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:layout_alignparentright= "true"Android:onclick= "Login"Android:text= "Login" />    </Relativelayout></LinearLayout>

Mainactivity:

 PackageCom.dreamtech.login;ImportJava.util.Map;ImportAndroid.os.Bundle;Importandroid.app.Activity;Importandroid.text.TextUtils;ImportAndroid.view.View;ImportAndroid.widget.CheckBox;ImportAndroid.widget.EditText;ImportAndroid.widget.Toast; Public classMainactivityextendsActivity {PrivateEditText Et_name; PrivateEditText Et_password; PrivateCheckBox Cb_ischeck; @Overrideprotected voidonCreate (Bundle savedinstancestate) {Super. OnCreate (savedinstancestate);        Setcontentview (R.layout.activity_main); Et_name=(EditText) Findviewbyid (r.id.et_username); Et_password=(EditText) Findviewbyid (R.id.et_userpassword); Cb_ischeck=(CheckBox) Findviewbyid (R.id.cb_ischeck); //read the saved dataMap<string, string> maps = Userinfoutils.readinfo (mainactivity. This); if(Maps! =NULL) {            //removedString name = Maps.get ("name"); String pwd= Maps.get ("pwd");            Et_name.settext (name);        Et_password.settext (PWD); }    }    //Click events     Public voidLogin (View v) {String name=Et_name.gettext (). toString (). Trim (); String pwd=Et_password.gettext (). toString (). Trim (); //determine if the user name password is empty        if(Textutils.isempty (name) | |Textutils.isempty (PWD)) {Toast.maketext (mainactivity). This, "The user name or password cannot be empty", Toast.length_long). Show (); } Else {            //This is not a database operation, just a simple login logicSYSTEM.OUT.PRINTLN ("Connection Server Authentication"); //stored on-premises            if(cb_ischeck.ischecked ()) {Booleanresult = Userinfoutils.saveinfo (mainactivity. This, name, PWD); if(Result) {Toast.maketext (mainactivity. This, "Saved successfully! ", Toast.length_long). Show (); } Else{toast.maketext (mainactivity). This, "Save Failed", Toast.length_long). Show (); }            } Else{toast.maketext (mainactivity). This, "Please tick", Toast.length_long). Show (); }        }    }}

Read-Write File tool class:

 PackageCom.dreamtech.login;ImportJava.io.BufferedReader;ImportJava.io.File;ImportJava.io.FileInputStream;ImportJava.io.FileOutputStream;ImportJava.io.InputStreamReader;ImportJava.util.HashMap;ImportJava.util.Map;ImportAndroid.content.Context; Public classUserinfoutils {//Save Data Tool class     Public Static BooleanSaveinfo (context context, string Username, string pwd) {Try{String path=Context.getfilesdir (). GetPath (); String result= Username + "&&" +pwd; File File=NewFile (Path, "Info.txt"); FileOutputStream Fos=Newfileoutputstream (file);            Fos.write (Result.getbytes ());            Fos.close (); return true; } Catch(Exception e) {e.printstacktrace (); return false; }    }     Public StaticMap<string, string>Readinfo (Context context) {Try{String path=Context.getfilesdir (). GetPath (); Map<string, string> maps =NewHashmap<string, string>(); File File=NewFile (Path, "Info.txt"); FileInputStream FIS=Newfileinputstream (file); BufferedReader BUFR=NewBufferedReader (NewInputStreamReader (FIS)); String content=Bufr.readline (); String[] Splits= Content.split ("&&"); String name= Splits[0]; String pwd= Splits[1]; Maps.put ("Name", name); Maps.put ("PWD", PWD);            Fis.close (); returnmaps; } Catch(Exception e) {e.printstacktrace (); return NULL; }    }}

Android Case 2: Simple login screen and save information