<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout 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:orientation="vertical" 
 tools:context="com.duanlian.sharedpreferencesdemo.MainActivity"> 
 
 <LinearLayout 
 android:layout_width="match_parent" 
 android:layout_height="50dp"> 
 
 <TextView 
  android:layout_width="wrap_content" 
  android:layout_height="match_parent" 
  android:gravity="center" 
  android:text="用户名" 
  android:textSize="23sp" /> 
 
 <EditText 
  android:id="@+id/username" 
  android:layout_width="0dp" 
  android:layout_height="wrap_content" 
  android:layout_weight="1" /> 
 </LinearLayout> 
 <LinearLayout 
 android:layout_width="match_parent" 
 android:layout_height="50dp"> 
 
 <TextView 
  android:layout_width="wrap_content" 
  android:layout_height="match_parent" 
  android:gravity="center" 
  android:text="密 码" 
  android:textSize="23sp" /> 
 
 <EditText 
  android:id="@+id/password" 
  android:layout_width="0dp" 
  android:layout_height="wrap_content" 
  android:layout_weight="1" /> 
 </LinearLayout> 
 <Button 
 android:onClick="save" 
 android:layout_width="match_parent" 
 android:layout_height="50dp" 
 android:text="保存信息"/> 
 <Button 
 android:onClick="change" 
 android:layout_width="match_parent" 
 android:layout_height="50dp" 
 android:text="跳转"/> 
</LinearLayout> 

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout 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:orientation="vertical" 
 tools:context="com.duanlian.sharedpreferencesdemo.MainActivity"> 
 
 <LinearLayout 
 android:layout_width="match_parent" 
 android:layout_height="50dp"> 
 
 <TextView 
  android:layout_width="wrap_content" 
  android:layout_height="match_parent" 
  android:gravity="center" 
  android:text="用户名" 
  android:textSize="23sp" /> 
 
 <EditText 
  android:id="@+id/username" 
  android:layout_width="0dp" 
  android:layout_height="wrap_content" 
  android:layout_weight="1" /> 
 </LinearLayout> 
 <LinearLayout 
 android:layout_width="match_parent" 
 android:layout_height="50dp"> 
 
 <TextView 
  android:layout_width="wrap_content" 
  android:layout_height="match_parent" 
  android:gravity="center" 
  android:text="密 码" 
  android:textSize="23sp" /> 
 
 <EditText 
  android:id="@+id/password" 
  android:layout_width="0dp" 
  android:layout_height="wrap_content" 
  android:layout_weight="1" /> 
 </LinearLayout> 
 <Button 
 android:onClick="get" 
 android:layout_width="match_parent" 
 android:layout_height="50dp" 
 android:text="得到信息"/> 
</LinearLayout> 

package com.duanlian.sharedpreferencesdemo; 
 
import android.content.Intent; 
import android.content.SharedPreferences; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.EditText; 
 
public class MainActivity extends AppCompatActivity { 
 
 private EditText passWors; 
 private EditText userName; 
 private SharedPreferences preferences; 
 private SharedPreferences.Editor editor; 
 
 @Override 
 protected void onCreate(Bundle savedInstanceState) { 
 super.onCreate(savedInstanceState); 
 setContentView(R.layout.activity_main); 
 initView(); 
 } 
 
 private void initView() { 
 userName = (EditText) findViewById(R.id.username); 
 passWors = (EditText) findViewById(R.id.password); 
 //1,实例化SharedPreferences对象,参数1:保存的名字,参数2:保存的模式MODE_PRIVATE私有的 
 preferences = getSharedPreferences("config", MODE_PRIVATE); 
 //2,让SharedPreferences处于可编辑状态 
 editor = preferences.edit(); 
 
 } 
 
 /** 
 * 保存按钮的监听 
 * @param view 
 */ 
 public void save(View view) { 
 //拿到用户输入的数据 
 String name = userName.getText().toString().trim(); 
 String pwd = passWors.getText().toString().trim(); 
 //3,储存数据,类似于map 
 editor.putString("name", name); 
 editor.putString("pwd", pwd); 
 //4,提交 
 editor.commit(); 
 
 } 
 
 /** 
 * 跳转的点击监听 
 * @param view 
 */ 
 public void change(View view) { 
 Intent intent = new Intent(MainActivity.this, ActivityA.class); 
 startActivity(intent); 
 
 } 
} 

package com.duanlian.sharedpreferencesdemo; 
 
import android.content.SharedPreferences; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.EditText; 
 
public class ActivityA extends AppCompatActivity { 
 
 private EditText userName; 
 private EditText passWord; 
 private String name; 
 private String pwd; 
 
 @Override 
 protected void onCreate(Bundle savedInstanceState) { 
 super.onCreate(savedInstanceState); 
 setContentView(R.layout.activity_a); 
 //得到数据 
 //1,得到SharedPreferences对象 
 SharedPreferences preferences = getSharedPreferences("config", 0); 
 //2,取出数据 
  name = preferences.getString("name",""); 
  pwd = preferences.getString("pwd", ""); 
 userName = (EditText) findViewById(R.id.username); 
 passWord = (EditText) findViewById(R.id.password); 
 
 } 
 
 /** 
 * 得到数据按钮的监听 
 * @param view 
 */ 
 public void get(View view) { 
 userName.setText(name); 
 passWord.setText(pwd); 
 } 
}