android练习一之保存用户名

//activity_main.xml

<RelativeLayoutxmlns: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"tools:context="com.vincentlin.saveusername.MainActivity"><EditTextandroid:id="@+id/etName"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_alignParentLeft="true"android:layout_alignParentTop="true"android:layout_marginLeft="25dp"android:layout_marginTop="18dp"android:ems="10"android:hint="用户名"><requestFocus/></EditText><EditTextandroid:id="@+id/etPwd"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_alignLeft="@+id/etName"android:layout_below="@+id/etName"android:layout_marginTop="50dp"android:ems="10"android:hint="密码"/><CheckBoxandroid:id="@+id/isCheck"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_alignLeft="@+id/etPwd"android:layout_below="@+id/etPwd"android:layout_marginTop="24dp"android:text="保存用户名"/><Buttonandroid:id="@+id/login"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_alignRight="@+id/etPwd"android:layout_below="@+id/isCheck"android:layout_marginTop="36dp"android:text="登陆"/></RelativeLayout>

//MainActivity.java

packagecom.vincentlin.saveusername;importandroid.app.Activity;importandroid.content.SharedPreferences;importandroid.content.SharedPreferences.Editor;importandroid.os.Bundle;importandroid.view.View;importandroid.view.View.OnClickListener;importandroid.widget.Button;importandroid.widget.CheckBox;importandroid.widget.EditText;importandroid.widget.Toast;publicclassMainActivityextendsActivity{privateEditTextetName,etPwd;privateCheckBoxisCheck;privateButtonlogin;privateSharedPreferencessp;privateEditoreditor;@OverrideprotectedvoidonCreate(BundlesavedInstanceState){super.onCreate(savedInstanceState);//将布局xml文件引入到activity当中setContentView(R.layout.activity_main);init();StringloginName=sp.getString("UserName","");StringloginPwd=sp.getString("UserPwd","");if(loginName!=null&&loginPwd!=null){isCheck.setChecked(true);etName.setText(loginName);etPwd.setText(loginPwd);}}privatevoidinit(){etName=(EditText)findViewById(R.id.etName);etPwd=(EditText)findViewById(R.id.etPwd);isCheck=(CheckBox)findViewById(R.id.isCheck);login=(Button)findViewById(R.id.login);sp=getSharedPreferences("UsersInfo",MODE_PRIVATE);editor=sp.edit();login.setOnClickListener(newOnClickListener(){@OverridepublicvoidonClick(Viewv){Stringname=etName.getText().toString().trim();Stringpwd=etPwd.getText().toString().trim();if(name.equals("admin")&&pwd.equals("123")){if(isCheck.isChecked()){editor.putString("UserName",name);editor.putString("UserPwd",pwd);editor.commit();Toast.makeText(MainActivity.this,"ok",0).show();}else{editor.remove(name);editor.remove(pwd);editor.commit();}}}});}}

更多相关文章

随机推荐