偏好保存（在Activity里很简洁）

转载请注明出处：http://blog.youkuaiyun.com/u011569040/article/details/45177227

这是在书本上看到的源码贴出

主要实现的功能：在MainActivity里输入 电话号码和城市名字，退出即保存，重新启动，直接读取

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="使用Shared Preferences存储程序信息" />
	<TextView 
	    android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="您的电话号码："/>
	<EditText 
	    android:id="@+id/phone_text"
	    android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:hint="输入电话号码"/>
	<TextView 
	    android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="您所在的城市"/>
	<EditText 
	    android:id="@+id/city_text"
	    android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:hint="输入城市名称"/>
</LinearLayout>

import javax.security.auth.PrivateCredentialPermission;

import introduction.android.SharedPreferencesDemo.R;

import android.app.Activity;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.widget.EditText;

public class SharedPreferencesDemo extends Activity {

    private EditText phoneText,cityText;
    private String phone,city;
    public static final String SET_INFO ="SET_Info";
    public static final String PHONE = "PHONE";
    public static final String CITY = "CITY";
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        phoneText=(EditText)findViewById(R.id.phone_text);
        cityText=(EditText)findViewById(R.id.city_text);
        /*获取Shared Preferences对象*/
        SharedPreferences setinfo = getPreferences(Activity.MODE_PRIVATE);
        /*取出保存的电话号码和地址信息*/
        phone = setinfo.getString(PHONE,"");
        city = setinfo.getString(CITY, "");
        /*将取出的信息分别放在对应的EditText中*/
        phoneText.setText(phone);
        cityText.setText(city);
    }
    
    @Override
    protected void onStop() {	
        SharedPreferences setinfo = getPreferences(Activity.MODE_PRIVATE);
        setinfo.edit()
        .putString(PHONE,phoneText.getText().toString())
        .putString(CITY,cityText.getText().toString())
        .commit();
        super.onStop();
    } 
}