SharedPreferences經常用來儲存一些預設歡迎語，使用者登入名和密碼等簡單資訊，一般用於儲存量小的資訊 exampleHelper.java

import android.content.Context;
import android.content.SharedPreferences;

/**
 * Created by 6lang on 2018/10/6.
 */

public class exampleHelper {
    SharedPreferences sp;
    SharedPreferences.Editor editor;
    Context context;
    public exampleHelper(Context c,String name)
    {
        context=c;
        sp=context.getSharedPreferences(name,0);
        editor=sp.edit();
    }
    public void putValue(String key,String value)
    {
        editor=sp.edit();
        editor.putString(key,value);
        editor.commit();
    }
    public String getValue(String key)
    {
        return sp.getString(key,null);
    }
}
 

1getSharedPreferences(檔名稱，操作模式) .得到SharedPreferences物件，0表示預設模式 2.editor=sp.edit(); 獲取一個Edit物件，所有對資料的操作都需要經過Edit 3.editor.commit(); 提交是必須的 MainActivity.java

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    public final static String COLUMN_NAME="name";
    public final static String COLUMN_MOBILE="mobile";
    exampleHelper sp;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        sp=new exampleHelper(this,"contact");
        //設定儲存的資訊
        sp.putValue(COLUMN_NAME,"Mr Wang");
        sp.putValue(COLUMN_MOBILE,"13223346556");
        String name=sp.getValue(COLUMN_NAME);
        String mobile=sp.getValue(COLUMN_MOBILE);
        TextView tv=new TextView(this);
        tv.setText("NAME:"+name+"\n"+"MOBILE:"+mobile);
        setContentView(tv);
    }
}