使用double进行数学运算的SharedPreferences不起作用，并且没有putDouble

Question

所以我想加两个Double，但结果却有些奇怪。 在这里，您可以看到它的外观。 在这里，它与没有putDouble的加字符串和SharedPreferences有关。 我已经尝试了最近2个小时来修复它，但我无法使其正常工作，有人可以帮助我。 这是代码：

package me.danilkp1234.laerkeholtmilk;

import android.content.Context;
import android.content.SharedPreferences;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Log;
import android.view.KeyEvent;
import android.view.inputmethod.EditorInfo;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.TextView.OnEditorActionListener;

import com.google.firebase.crash.FirebaseCrash;

import static me.danilkp1234.laerkeholtmilk.R.id.brix;
import static me.danilkp1234.laerkeholtmilk.R.id.textView;
import static me.danilkp1234.laerkeholtmilk.R.id.textView3;

public class MainActivity extends AppCompatActivity {

private EditText milkdone;
private EditText brixdone;
private double milkdone2;
private double brixdone2;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    milkdone = (EditText) findViewById(R.id.milkliter);
    brixdone = (EditText) findViewById(R.id.brix);
    SharedPreferences prefs = getSharedPreferences("SavedTotals",Context.MODE_PRIVATE);
    String MilkDone2Saved=(prefs.getString("MilkDone2Saved",String.valueOf(milkdone)));
    if(!TextUtils.isEmpty(MilkDone2Saved)){
        milkdone2 = Double.parseDouble(MilkDone2Saved);
    }
    String BrixDone2Saved=(prefs.getString("BrixDone2Saved",String.valueOf(milkdone)));
    if(!TextUtils.isEmpty(BrixDone2Saved)){
        brixdone2 = Double.parseDouble(BrixDone2Saved);
    }
    brixdone.setText(String.valueOf(brixdone2));
    milkdone.setText(String.valueOf(milkdone2));
    milkdone.setOnEditorActionListener(new OnEditorActionListener() {
        @Override
        public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
            boolean handled = false;
            if (actionId == EditorInfo.IME_ACTION_DONE) {
                SharedPreferences prefs = getSharedPreferences("SavedTotals",Context.MODE_PRIVATE);
                String MilkDone2Saved=(prefs.getString("MilkDone2Saved",String.valueOf(milkdone)));
                if(!TextUtils.isEmpty(MilkDone2Saved)){
                    milkdone2 = Double.parseDouble(MilkDone2Saved);
                }
                String BrixDone2Saved=(prefs.getString("BrixDone2Saved",String.valueOf(milkdone)));
                if(!TextUtils.isEmpty(BrixDone2Saved)){
                    brixdone2 = Double.parseDouble(BrixDone2Saved);
                }
                double test2 = brixdone2 + milkdone2;
                TextView change = (TextView) findViewById(R.id.textView3);
                change.setText(String.valueOf(test2));
                handled = true;
            }
            return handled;
        }

    });
    brixdone.setOnEditorActionListener(new OnEditorActionListener() {
        @Override
        public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
            boolean handled = false;
            if (actionId == EditorInfo.IME_ACTION_DONE){
                SharedPreferences prefs = getSharedPreferences("SavedTotals",Context.MODE_PRIVATE);
                String MilkDone2Saved=(prefs.getString("MilkDone2Saved",String.valueOf(milkdone)));
                if(!TextUtils.isEmpty(MilkDone2Saved)){
                    milkdone2 = Double.parseDouble(MilkDone2Saved);
                }
                String BrixDone2Saved=(prefs.getString("BrixDone2Saved",String.valueOf(milkdone)));
                if(!TextUtils.isEmpty(BrixDone2Saved)){
                    brixdone2 = Double.parseDouble(BrixDone2Saved);
                }
                double test2 = brixdone2 + milkdone2;
                TextView change = (TextView) findViewById(R.id.textView3);
                change.setText(String.valueOf(test2));
                handled = true;
            }
            return handled;
        }
    });
    };
    public void onStop() {
        super.onStop();
        storeDouble("MilkDone2Saved",milkdone);
        storeDouble("BrixDone2Saved",brixdone);

    }
    public void storeDouble(String d, EditText c){
        SharedPreferences prefs = getSharedPreferences("SavedTotals",Context.MODE_PRIVATE);

        SharedPreferences.Editor editor = prefs.edit();

        editor.putString(d,String.valueOf(c.getText().toString()));
        editor.apply();
}
public void GetDouble(){
    SharedPreferences prefs = getSharedPreferences("SavedTotals",Context.MODE_PRIVATE);

}

}

它从double转换为string再到double（我认为）。 它应该做brixdone2 + milkdone2，它的结果不正确编辑：更改了它，现在应用程序崩溃了

Caused by java.lang.ClassCastException
java.lang.String cannot be cast to java.lang.Long
android.app.SharedPreferencesImpl.getLong (SharedPreferencesImpl.java:279)
me.danilkp1234.laerkeholtmilk.MainActivity.getDouble (MainActivity.java:31)
me.danilkp1234.laerkeholtmilk.MainActivity.onCreate (MainActivity.java:40)
android.app.Activity.performCreate (Activity.java:7174)

这是崩溃的更新代码

Answer 1

我不确定，但是问题可能在这里

字符串MilkDone2Saved =（prefs.getString（“ MilkDone2Saved”，String.valueOf（milkdone）））;;

getString返回与MikeDone2Saved密钥关联的字符串，如果未找到密钥，则默认值为

String.valueOf（milkdone）

但是我的事情是onCreate（）中的 String.valueOf（milkdone）会有垃圾值，所以再次检查一下...