共享偏好无法获取数据

Question

我正在尝试为我的应用程序制作促销代码，当用户在EditText中给出正确的值时，我将设置一个布尔值false，并且数字将存储在共享首选项中。但是不知道为什么值没有减少，即使它减少了，即使我多次执行它只有它从30移动到29.所以我创建了一个测试应用程序，我在onClick设置值发生了什么当促销代码相等时。因此，减少的事情是当用户打开应用程序时，数字将减少并在布尔值为false时存储回来

public class MainActivity extends AppCompatActivity {
   TextView textView;
    Button button, button1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        textView = (TextView) findViewById(R.id.textView);
        button = (Button) findViewById(R.id.button);
        button1 = (Button) findViewById(R.id.button2);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                SharedPreferences prefs = getSharedPreferences("Admob", 0);
                SharedPreferences.Editor editor = prefs.edit();
                editor.putBoolean("ShowAd", false);
                editor.putLong("daycounter", 30);
                editor.commit();
            }
        });
        caller();
    }

    @Override
    protected void onResume() {
        super.onResume();
        caller();
    }

    @Override
    protected void onPause() {
        super.onPause();
        caller();
    }


    public void caller() {
        SharedPreferences settings = getSharedPreferences("Admob", 0);
        boolean ad_start = settings.getBoolean("ShowAd", true);
        long ad = settings.getLong("daycounter", 0);

        SharedPreferences prefs = getSharedPreferences("apprater", 0);

        SharedPreferences.Editor editor = prefs.edit();

        Log.e("toaster", "" + ad_start);
        if (!ad_start) {
            long ads = ad -1 ;

            if (ad > 0) {
                editor.putLong("daycounter", ads);
                editor.putBoolean("ShowAd", true);
                editor.commit();
                Toast.makeText(MainActivity.this, "" + ads, Toast.LENGTH_SHORT).show();
                textView.setText(ad + "R" + ad_start);
            }
        }

    }
}

在虚拟应用程序中，我在TextView中显示数据，所以我调用onResume和onPause方法，否则我知道onCreate就足够了。我不明白算法中有什么不对。我没有得到任何错误，在吐司我只能将值减少到29。我已经尝试过所有类型的减量操作。任何建议都会有所帮助。**我能够保存数据onle问题是lonng值没有得到保存而没有减少**

Answer 1

将这些方法放在utils类中并使用

  public static void cacheBoolean(Context ctx, String k, Boolean v) {
    SharedPreferences prefs = getSharedPreferences(ctx);
    prefs.edit().putBoolean(k, v).apply();
}

public static Boolean getCachedBoolean(Context ctx, String k, Boolean defaultValue) {
    SharedPreferences prefs = getSharedPreferences(ctx);
    return prefs.getBoolean(k, defaultValue);
}

public static void cacheString(Context ctx, String k, String v) {
    SharedPreferences prefs = getSharedPreferences(ctx);
    prefs.edit().putString(k, v).apply();
}

public static String getCachedString(Context ctx, String k, String defaultValue) {
    SharedPreferences prefs = getSharedPreferences(ctx);
    return prefs.getString(k, defaultValue);
}

public static void cacheInt(Context ctx, String k, int v) {
    SharedPreferences prefs = getSharedPreferences(ctx);
    prefs.edit().putInt(k, v).apply();
}

public static int getCachedInt(Context ctx, String k, int defaultValue) {
    SharedPreferences prefs = getSharedPreferences(ctx);
    return prefs.getInt(k, defaultValue);
}

public static void clearCachedKey(Context context, String key) {
    getSharedPreferences(context).edit().remove(key).apply();
}

Answer 2

您不需要在任何地方放置共享首选项，只需在onCreate方法中初始化它并从常量String访问，因此很容易访问它。

public class MainActivity extends AppCompatActivity {
   TextView textView;
    Button button, button1;
   SharedPreferences prefs;
   SharedPreferences.Editor editor;
   final String pref_name = "Admob";
   final String ad_name = "ShowAd";
   final String day_count = "daycounter";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        textView = (TextView) findViewById(R.id.textView);
        button = (Button) findViewById(R.id.button);
        button1 = (Button) findViewById(R.id.button2);
        prefs = getSharedPreferences(pref_name, 0);
        editor = prefs.edit();
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                editor.putBoolean(ad_name, false);
                editor.putLong(day_count, 30);
                editor.commit();
            }
        });
        caller();
    }

    @Override
    protected void onResume() {
        super.onResume();
        caller();
    }

    @Override
    protected void onPause() {
        super.onPause();
        caller();
    }


    public void caller() {
        boolean ad_start = prefs.getBoolean(ad_name, true);
        long ad = prefs.getLong(day_count, 0);

        Log.e("toaster", "" + ad_start);
        if (!ad_start) {
            long ads = ad -1 ;

           if (ad < 0) {
              editor.putBoolean(ad_name, true);
            }
           editor.putLong(day_count, ads);
           editor.commit();
           Toast.makeText(MainActivity.this, "" + ads, Toast.LENGTH_SHORT).show();
           textView.setText(ad + "R" + ad_start);
        }

    }
}

Answer 3

我在这个方法中犯了错误，部分是艾哈迈德先生我的错误是将值设置为等于 if (ad > 0)所以当值大于零时，布尔值为st，数据永远不会有机会减少更多

 public void caller() {
    SharedPreferences settings = getSharedPreferences("Admob", 0);
    boolean ad_start = settings.getBoolean("ShowAd", true);
    long ad = settings.getLong("daycounter", 0);


    Log.e("toaster", "" + ad_start);
    if (!ad_start) {
        SharedPreferences prefs = getSharedPreferences("Admob", 0);

        SharedPreferences.Editor editor = prefs.edit();
        long ads = ad - 1;

        if (ad < 0) {
            editor.putBoolean("ShowAd", true);
        }
        editor.putLong("daycounter", ads);
        editor.commit();
        Toast.makeText(MainActivity.this, "" + ads, Toast.LENGTH_SHORT).show();
        textView.setText(ad + "R" + ad_start);
    }

}