Question

我有一个小部件，我想从设置活动中设置一些值。我已使用以下代码将值保存到共享pref：

MainActivity.editor.putInt("selected_theme", 1);
            MainActivity.editor.commit();

在remoteview类中，我在onUpdate方法中做了这样的事情：

MainActivity.prefs = context.getSharedPreferences("prefs", Context.MODE_PRIVATE );
    MainActivity.editor = MainActivity.prefs.edit();

    int saved_value = MainActivity.prefs.getInt("selected_theme", 0);
    Log.d("ggg", "receiver: " + saved_value);

然而它总是给我值 0 ，这是默认值。我需要从共享首选项中获取整数值，如 1,2,3 ...... ，这些值已在Activity类中完成。在此先感谢：）

Answer 1

您应始终使用Utility Classes来执行数据持久性（共享首选项，数据库，序列化等）等任务。
我在这里为您提供一个基本模板：

GenericUtility.class ：

package com.your.packagename;

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

public class GenericUtility {

    public static int getIntFromSharedPrefsForKey(String key, Context context)
    {
        int selectedValue = 0;

        SharedPreferences prefs = context.getSharedPreferences("com.your.packagename", Context.MODE_PRIVATE);
        selectedValue = prefs.getInt(key, 0);

        return selectedValue;
    }

    public static boolean setIntToSharedPrefsForKey(String key, int value, Context context)
    {
        boolean savedSuccessfully = false;

        SharedPreferences prefs = context.getSharedPreferences("com.your.packagename", Context.MODE_PRIVATE);
        SharedPreferences.Editor editor = prefs.edit();

        try
        {
            editor.putInt(key, value);
            editor.apply();
            savedSuccessfully = true;
        }
        catch (Exception e)
        {
            savedSuccessfully = false;
        }

        return savedSuccessfully;
    }

    public static String getStringFromSharedPrefsForKey(String key, Context context)
    {
        String selectedValue = "";

        SharedPreferences prefs = context.getSharedPreferences("com.your.packagename", Context.MODE_PRIVATE);
        selectedValue = prefs.getString(key, "");

        return selectedValue;
    }

    public static boolean setStringToSharedPrefsForKey(String key, String value, Context context)
    {
        boolean savedSuccessfully = false;

        SharedPreferences prefs = context.getSharedPreferences("com.your.packagename", Context.MODE_PRIVATE);
        SharedPreferences.Editor editor = prefs.edit();

        try
        {
            editor.putString(key, value);
            editor.apply();
            savedSuccessfully = true;
        }
        catch (Exception e)
        {
            savedSuccessfully = false;
        }

        return savedSuccessfully;
    }
}

用法示例：

用于在共享首选项中保存数据：

GenericUtility.setIntToSharedPrefsForKey("selected_theme", 1, getApplicationContext());

OR

GenericUtility.setIntToSharedPrefsForKey("selected_theme", 1, MyActivity.this));

从共享首选项中检索数据：

int selectedValue = GenericUtility.getIntFromSharedPrefsForKey("selected_theme", getApplicationContext());

OR

int selectedValue = GenericUtility.getIntFromSharedPrefsForKey("selected_theme", MyActivity.this);

我希望这会有所帮助。

从remoteview中的共享首选项中获取价值

1 个答案: