Android中SharePreferences的简单实现

Android中提供SharePreferences这种轻量级的数据存储模式，这种模式能够存储少量数据，并能为自身和其他应用提供数据接口。相对于其他数据存储方式，SharePreferences更加轻量。以下是整个SharePreferences实现的代码：

xml布局文件：

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

              android:orientation="vertical"

              android:layout_width="fill_parent"

              android:layout_height="fill_parent"

        >

    <EditText

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:id="@+id/editText" android:width="200dp"/>

    <EditText

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:inputType="textPassword"

            android:ems="10"

            android:id="@+id/editText2"/>

    <Button

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="保存"

            android:id="@+id/button"/>

    <TextView

            android:layout_width="fill_parent"

            android:layout_height="wrap_content"

            android:text="New Text"

            android:id="@+id/textView"/>

    <TextView

            android:layout_width="fill_parent"

            android:layout_height="wrap_content"

            android:text="New Text"

            android:id="@+id/textView2"/>

    <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="显示"

            android:id="@+id/button2"/>

</LinearLayout>

 

java主文件：

package com.example.sharepreferencesTest;



import android.app.Activity;

import android.content.Context;

import android.content.SharedPreferences;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;



public class MyActivity extends Activity {

    /**

     * Called when the activity is first created.

     */

    private EditText user;

    private EditText address;

    private Button login;

    private Button show;

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);



        user = (EditText)findViewById(R.id.editText);

        address = (EditText)findViewById(R.id.editText2);

        login = (Button)findViewById(R.id.button);



        login.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                //写入SharedPreferences中

                SharedPreferences user_ino = getSharedPreferences("user_ino", Context.MODE_PRIVATE);  //使用MODE_PRIVATE模式

                SharedPreferences.Editor editor = user_ino.edit();



                String ename = user.getText().toString();

                String eaddress = address.getText().toString();



                editor.putString("name",ename);

                editor.putString("address", eaddress);

                editor.commit();

            }

        });



        show = (Button)findViewById(R.id.button2);

        show.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                //读入SharedPreferences中的值

                SharedPreferences user_ino2 = getSharedPreferences("user_ino", Context.MODE_PRIVATE);

                String name1 = user_ino2.getString("name","");

                String age1 = user_ino2.getString("address","");



                //显示出读出的值

                TextView tv1 = (TextView)findViewById(R.id.textView);

                TextView tv2 = (TextView)findViewById(R.id.textView2);

                tv1.setText(name1);

                tv2.setText(age1);

            }

        });











    }

}