安卓開發數據持久化技術——SharedPreference存儲

爲了提高開發水平，準備把郭神第二行代碼的demo都碼一遍並記錄下來。此篇文章是：安卓開發數據持久化技術——SharedPreference存儲。
廢話不多說，直接上代碼。

package com.hsg.mydemo;

import android.content.SharedPreferences;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

/**
 * 簡單鍵值對的存儲
 */
public class SharedPreferenceActivity extends AppCompatActivity {

    private TextView tvSPDate;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_shared_preference);

        tvSPDate = ((TextView) findViewById(R.id.tvSPData));


    }

    public void btnSPData(View view) {
        switch (view.getId()){
            case R.id.btnSPWrite:
                writeUser();
                break;
            case R.id.btnSPRead:
                readUser();
            default:
                break;
        }
    }

    public void writeUser(){
        SharedPreferences.Editor editor = getSharedPreferences("userdata",MODE_PRIVATE).edit();
        editor.putString("name","Joe");
        editor.putInt("age",18);
        editor.putBoolean("married",false);
        editor.apply();
    }
    public void readUser(){
        SharedPreferences sharedPreferences = getSharedPreferences("userdata",MODE_PRIVATE);
        String name = sharedPreferences.getString("name","無名氏");
        int age = sharedPreferences.getInt("age",1);//後面是默認值
        boolean married = sharedPreferences.getBoolean("married",false);
        tvSPDate.setText("SharedPreference數據，名字："+name+",年齡："+age+",婚姻狀況："+married+"。");
    }
}