java - 保存一个 int 计数并将其检索到其他活动

Question

我正在创建一个游戏，其中为用户提供每个问题的提示，当用户按下提示按钮时，提示计数必须减少 1，我有很多具有相同类型逻辑的活动。如何编辑数据并将其获取到我们想要的任何地方。请帮帮我

Answer 1

You could just keep count value in a static variable inside your Application class.

In your AndroidManifest.xml you define.-

<application
    android:allowBackup="true"
    android:name=".YourApplicatinClass"
    ...

Then define YourApplicationApplication class like.-

public class YourApplicationClass extends Application { 
    public static int cont = 0;
}

And access cont value whenever you need with

YourApplicationClass.cont

Answer 2

You should just save it in SharedPreferences. Have a look at this Question, that should give you the hint how to work with it. You can write a static method to read an decrement the value saved in there

class Activity1{


    onClickListener(){
        GlobalSettings.getHits(context)
    }

}


class Activity2{

    onClickListener(){
        GlobalSettings.getHits(context)
    }

}



class GlobalSettings{
    private static String PREFS_NAME = "myprefs";
    private static String PREF_HITS = "hits";
    private static int START_VALUE = 10;

    public static int getHits(Context context){
        SharedPreferences settings = context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE);
        return settings.getInt(PREF_HITS, START_VALUE); 
    }

    public static void incrementHits(Context context){
        SharedPreferences settings = getSharedPreferences(PREFS_NAME , 0);
        SharedPreferences.Editor editor = settings.edit();

        editor.putInt(PREF_HITS, getHits(context) + 1);
        editor.commit();
    }

    public static void decrementHits(Context context){
        SharedPreferences settings = getSharedPreferences(PREFS_NAME , 0);
        SharedPreferences.Editor editor = settings.edit();

        editor.putInt(PREF_HITS, getHits(context) - 1);
        editor.commit();    
    }

}