Android学习--SharedPreference存储

SharedPreference存储

存：a.获取SharedPreference对象

b.调用edit方法获取Editor对象

c.通过Editor对象以键值对方式存储

d.调用apply方法提交

取：

a.获取SharedPreference对象

b.通过SharedPreference对象的get方法

1、主MainActivity中

package com.example.sharedpreferencestest;

import android.content.SharedPreferences;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button saveData = (Button) findViewById(R.id.save_data);
        saveData.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //获取SharedPreferences对象 3种方法
                //1、Context中getSharedPreferences()
                //2、Activity中getSharedPreferences()
                //3、PreferenceManager中getDefaultSharedPreferences()
                SharedPreferences.Editor editor = getSharedPreferences("data", MODE_PRIVATE).edit();
                editor.putString("name", "Tom");
                editor.putInt("age", 28);
                editor.putBoolean("married", true);
                editor.apply();
            }
        });

        Button restoreDate = (Button) findViewById(R.id.restore_data);
        restoreDate.setOnClickListener(new View.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);
            }
        });
    }
}

2、布局文件activity_main.xml

<?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=".MainActivity">

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/save_data"
        android:text="save data"/>

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/restore_data"
        android:text="restore data"/>
</LinearLayout>

3、运行效果