1 package com.example.sharedpreferences; 2  3 import android.os.Bundle; 4 import android.preference.PreferenceManager; 5 import android.app.Activity; 6 import android.content.SharedPreferences; 7 import android.content.SharedPreferences.Editor; 8 import android.view.Menu; 9 import android.view.View;10 import android.view.View.OnClickListener;11 import android.widget.Button;12 import android.widget.CheckBox;13 import android.widget.EditText;14 import android.widget.TextView;15 import android.widget.Toast;16 17 public class MainActivity extends Activity implements OnClickListener{18     private EditText et1,et2;19     private CheckBox cb1;20     private Button bt1,bt2;21     private SharedPreferences pref;22     private Editor editor;23     private TextView tv1;24     @Override25     protected void onCreate(Bundle savedInstanceState) {26         super.onCreate(savedInstanceState);27         setContentView(R.layout.activity_main);28 //        SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(this);29 //        SharedPreferences pref = getSharedPreferences("mypref", MODE_PRIVATE);30 //        Editor editor = pref.edit();31 //        editor.putString("name", "阿狸");32 //        editor.putLong("time", System.currentTimeMillis());33 //        editor.commit();34 //        System.out.println(pref.getString("name", ""));35 //        System.out.println(pref.getLong("time", 0));36         37         et1 = (EditText) findViewById(R.id.editText1);38         et2 = (EditText) findViewById(R.id.editText2);39         cb1 = (CheckBox) findViewById(R.id.checkBox1);40         bt1 = (Button) findViewById(R.id.button1);41         bt2 = (Button) findViewById(R.id.button2);42         tv1 = (TextView) findViewById(R.id.textView1);43         bt1.setOnClickListener(this);44         bt2.setOnClickListener(this);45         pref = getSharedPreferences("mypref1", MODE_PRIVATE);46         editor = pref.edit();47         String name = pref.getString("username", "");48         if(name == null) {49             cb1.setChecked(false);50         }else{51             cb1.setChecked(true);52             et1.setText(name);53         }54     }55 56     @Override57     public void onClick(View v) {58         // TODO Auto-generated method stub59         switch (v.getId()) {60         case R.id.button1:61             String name = et1.getText().toString().trim();62             String pass = et2.getText().toString().trim();63             if(name.equals("admin")&&pass.equals("123456")){64                 if(cb1.isChecked()){65                     editor.putString("username", "admin");66                     editor.commit();67                 }else {68                     editor.remove("username");69                     editor.commit();70                 }71                 Toast.makeText(MainActivity.this, "登陆成功！", Toast.LENGTH_SHORT).show();72             }else{73                 Toast.makeText(MainActivity.this, "登陆失败！", Toast.LENGTH_SHORT).show();74             }75             break;76         case R.id.button2:77             78             break;79         }80     }81     82 }

 1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 2     xmlns:tools="http://schemas.android.com/tools" 3     android:layout_width="match_parent" 4     android:layout_height="match_parent" 5     tools:context=".MainActivity" > 6  7     <TextView 8         android:id="@+id/textView1" 9         android:layout_width="wrap_content"10         android:layout_height="wrap_content"11         android:layout_alignParentLeft="true"12         android:layout_alignParentTop="true"13         android:layout_marginLeft="17dp"14         android:layout_marginTop="18dp"15         android:text="用户名：" />16 17     <EditText18         android:id="@+id/editText1"19         android:layout_width="wrap_content"20         android:layout_height="wrap_content"21         android:layout_alignBaseline="@+id/textView1"22         android:layout_alignBottom="@+id/textView1"23         android:layout_alignRight="@+id/button2"24         android:layout_toRightOf="@+id/textView1"25         android:ems="10" >26 27         <requestFocus />28     </EditText>29 30     <TextView31         android:id="@+id/textView2"32         android:layout_width="wrap_content"33         android:layout_height="wrap_content"34         android:layout_alignLeft="@+id/textView1"35         android:layout_below="@+id/editText1"36         android:layout_marginTop="14dp"37         android:text="密码：" />38 39     <EditText40         android:id="@+id/editText2"41         android:layout_width="wrap_content"42         android:layout_height="wrap_content"43         android:layout_alignLeft="@+id/editText1"44         android:layout_alignRight="@+id/editText1"45         android:layout_below="@+id/editText1"46         android:ems="10"47         android:inputType="textPassword" />48 49     <CheckBox50         android:id="@+id/checkBox1"51         android:layout_width="wrap_content"52         android:layout_height="wrap_content"53         android:layout_alignLeft="@+id/textView2"54         android:layout_below="@+id/editText2"55         android:layout_marginTop="16dp"56         android:checked="false"57         android:text="保存" />58 59     <Button60         android:id="@+id/button1"61         android:layout_width="wrap_content"62         android:layout_height="wrap_content"63         android:layout_alignLeft="@+id/checkBox1"64         android:layout_below="@+id/checkBox1"65         android:layout_marginTop="14dp"66         android:text="确定" />67 68     <Button69         android:id="@+id/button2"70         android:layout_width="wrap_content"71         android:layout_height="wrap_content"72         android:layout_alignBaseline="@+id/button1"73         android:layout_alignBottom="@+id/button1"74         android:layout_alignParentRight="true"75         android:layout_marginRight="26dp"76         android:text="取消" />77 78 </RelativeLayout>