Android學習筆記——SharedPreferences存儲

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;    //保存數據
    private Button restoreData; //讀取數據

    @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();
            }
        });
    }

}