Question

我想每天进行一次活动。我找到了这样做的方法：

    Calendar calendar = Calendar.getInstance();
    int currentday = calendar.get(Calendar.DAY_OF_MONTH);
    Log.d("Today",""+currentday);

    SharedPreferences settings = getSharedPreferences("DAY", 0);
    int lastday = settings.getInt("day", 0);
    Log.d("Last day",""+lastday);

 if(lastday==currentday){Toast.makeText(MainActivity.this,"Activity will run just once a day",Toast.LENGTH_SHORT).show();}
}

说今天的值是20，最后一天如何从settings.getInt（）获取它的值？

Answer 1

以这种方式尝试先将日期存储到共享的偏好中。

 SharedPreferences.Editor editor = getSharedPreferences(MY_PREFS_NAME, MODE_PRIVATE).edit();
 editor.putString("name", "Elena");
 editor.putInt("day", 12);
 editor.apply();

并获取如下数据..

SharedPreferences prefs = getSharedPreferences(MY_PREFS_NAME, MODE_PRIVATE); 
String name = prefs.getString("name", "No name defined");//"No name defined" is the default value.
int day = prefs.getInt("day", 0); //0 is the default value.

Answer 2

这是我在应用程序中用于存储和存储在名为AppPreferences的单独类中的内容。可能您可以修改和使用它，还可以记录值，以防您要检查并存储值。让我知道，如果我回答了您

public static final String PREFS_KEY = "example_key";  
public static final String APP_PREFS = "example_prefs";


     /**
         * Returns the value stored
         *
         * @return String containing the value
         */
        public static String getValueStored() {
            SharedPreferences prefs = AppAplication.getContext().getSharedPreferences(APP_PREFS, Context.MODE_PRIVATE);
            return prefs.getString(PREFS_KEY , "");
        }

     /**
         * Sets the value
         *
         * @return true if the value was saved, false on failure
         */
        public static boolean setValueToStore(final String url) {
            SharedPreferences prefs = AppAplication.getContext().getSharedPreferences(APP_PREFS, Context.MODE_PRIVATE);
            SharedPreferences.Editor prefsEditor = prefs.edit();
            prefsEditor.putString(PREFS_KEY , url);
            return prefsEditor.commit();
        }

Answer 3

以下是Java中的示例：

public class MainActivity extends AppCompatActivity {

    public static final String TAG = "MainActivity";

    public static final String PREF = "PREF";
    public static final String KEY_DAY = "KEY_DAY";

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        SharedPreferences pref = getSharedPreferences(PREF, Context.MODE_PRIVATE);

        // Set
        pref.edit().putInt(KEY_DAY, 20).apply();

        // Get
        int lastDay = pref.getInt(KEY_DAY, 0);
        Log.d(TAG, "lastDay: " + lastDay);

    }
}

使用SharedPreferences获取月份中的某天

3 个答案: