项目完整压缩包：http://download.csdn.net/detail/iwanghang/9606408
manifests.xml：
<?xml version="1.0" encoding="utf-8"?>MainActivity.java：
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.iwanghang.sharedpreferencesdemo">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
package com.iwanghang.sharedpreferencesdemo;activity_main.xml：
import android.app.Activity;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import java.util.Map;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
/**
* 任意key及对应value写入，全部key和value读取
*/
final EditText editText_key = (EditText) findViewById(R.id.editText_key);
final EditText editText_value = (EditText) findViewById(R.id.editText_value);
Button button_write = (Button) findViewById(R.id.button_write);
Button button_read_all = (Button) findViewById(R.id.button_read_all);
/**
* name的value写入，name的value读取
*/
final EditText editText_name = (EditText) findViewById(R.id.editText_name);
Button button_write_name = (Button) findViewById(R.id.button_write_name);
Button button_read_name = (Button) findViewById(R.id.button_read_name);
/**
* age的value写入，age的value读取
*/
final EditText editText_age = (EditText) findViewById(R.id.editText_age);
Button button_write_age = (Button) findViewById(R.id.button_write_age);
Button button_read_age = (Button) findViewById(R.id.button_read_age);
/**
* 内容显示
*/
final TextView textView_content = (TextView) findViewById(R.id.textView_content);
//1、获取SharedPreferences对象。SharedPreferences是一个接口，程序无法直接创建SharedPreferences对象，只能通过Context提供的getSharedPreferences()方法。
final SharedPreferences preference = getSharedPreferences("test", MODE_PRIVATE);
//2、获取SharedPreferences。Editor对象，用于写数据。本步骤只对写数据有必要。
final SharedPreferences.Editor editor = preference.edit();
button_write.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
String key = editText_key.getText().toString().trim();
String value = editText_value.getText().toString().trim();
//3、写入数据并commit。
editor.putString(key, value);
editor.commit();
}
});
/**
* 读取所有数据
*/
button_read_all.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
String content = "";
Map<String, ?> allContent = preference.getAll();
// 注意遍历map的方法
for(Map.Entry<String, ?> entry : allContent.entrySet()){
content += ("key:" + entry.getKey()+ "=" +entry.getValue() + ", ");
}
textView_content.setText(content);
}
});
/**
* name写入
*/
button_write_name.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
String key = "name";
String value = editText_name.getText().toString().trim();
//3、写入数据并commit。
editor.putString(key, value);
editor.commit();
}
});
/**
* name读取
*/
button_read_name.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
String content = preference.getString("name", "null");
textView_content.setText(content);
}
});
/**
* age写入
*/
button_write_age.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
String key = "age";
String value = editText_age.getText().toString().trim();
//3、写入数据并commit。
editor.putString(key, value);
editor.commit();
}
});
/**
* age读取
*/
button_read_age.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
String content = preference.getString("age", "17");
textView_content.setText(content);
}
});
}
}
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<!-- 写入任意key -->
<LinearLayout
android:id="@+id/write_key_layout"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/insert_text_setOut"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="请输入任意key："
android:textSize="20dp" />
<EditText
android:id="@+id/editText_key"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</LinearLayout>
<!-- 写入任意value -->
<LinearLayout
android:id="@+id/write_value_layout"
android:layout_below="@+id/write_key_layout"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/insert_text_setOut2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="请输入对应value："
android:textSize="20dp" />
<EditText
android:id="@+id/editText_value"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</LinearLayout>
<!-- 写入读取按钮 -->
<RelativeLayout
android:id="@+id/write_read_layout"
android:layout_below="@+id/write_value_layout"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<Button
android:id="@+id/button_write"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="key写入"/>
<Button
android:id="@+id/button_read_all"
android:layout_alignParentRight="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="全部读取"/>
</RelativeLayout>
<!-- name -->
<LinearLayout
android:id="@+id/write_name_layout"
android:layout_below="@+id/write_read_layout"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/insert_text_setOut3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="请输入name的value："
android:textSize="20dp" />
<EditText
android:id="@+id/editText_name"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</LinearLayout>
<!-- name写入读取按钮 -->
<RelativeLayout
android:id="@+id/name_write_read_layout"
android:layout_below="@+id/write_name_layout"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<Button
android:id="@+id/button_write_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="name写入"/>
<Button
android:id="@+id/button_read_name"
android:layout_alignParentRight="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="name读取"/>
</RelativeLayout>
<!-- age -->
<LinearLayout
android:id="@+id/write_age_layout"
android:layout_below="@+id/name_write_read_layout"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/insert_text_setOut4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="请输入age的value："
android:textSize="20dp" />
<EditText
android:id="@+id/editText_age"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</LinearLayout>
<!-- name写入读取按钮 -->
<RelativeLayout
android:id="@+id/age_write_read_layout"
android:layout_below="@+id/write_age_layout"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<Button
android:id="@+id/button_write_age"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="age写入"/>
<Button
android:id="@+id/button_read_age"
android:layout_alignParentRight="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="age读取"/>
</RelativeLayout>
<TextView
android:id="@+id/textView_content"
android:layout_below="@id/age_write_read_layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="读取内容显示" />
</RelativeLayout>