Android学习笔记——SharedPreferences存储

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activity_main.xml

<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="com.example.sharedpreferencestest.MainActivity" >    <Button        android:id="@+id/save_data"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="Save data" />    <Button        android:id="@+id/restore_data"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_alignParentTop="true"        android:layout_centerHorizontal="true"        android:layout_marginTop="124dp"        android:text="Restore data" /></RelativeLayout>

MainActivity.java

package com.example.sharedpreferencestest;import android.app.Activity;import android.content.SharedPreferences;import android.os.Bundle;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.Toast;public class MainActivity extends Activity {    private Button saveData;    //保存数据    private Button restoreData; //读取数据    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        saveData = (Button) findViewById(R.id.save_data);        saveData.setOnClickListener(new OnClickListener(){            @Override            public void onClick(View v){                SharedPreferences.Editor editor = getSharedPreferences("data", MODE_PRIVATE).edit();                editor.putString("name", "Yimi");                editor.putInt("age", 20);                editor.putBoolean("married", false);                editor.commit();    //提交            }        });        restoreData = (Button) findViewById(R.id.restore_data);        restoreData.setOnClickListener(new OnClickListener(){            @Override            public void onClick(View v){                SharedPreferences pref = getSharedPreferences("data", MODE_PRIVATE);                String name = pref.getString("name", "");                int age = pref.getInt("age", 0);                boolean married = pref.getBoolean("married", false);                Log.d("MainActivity", "name is " + name);                Log.d("MainActivity", "age is " + age);                Log.d("MainActivity", "married is " + married);                Toast.makeText(MainActivity.this, "" + name + age +married, Toast.LENGTH_SHORT).show();            }        });    }}

按下”Save data”就会使用SharedPreferences.Editor把数据存储起来，可以在DDMS的File Explorer下进入/data/data/[packagename]/shared_prefs/目录下可以看到生成了data.xml的文件，点击导出按钮并用记事本查看如下：