每次都要自行实例化SP相关的类,肯定很麻烦,这里贴个SP的工具类,大家可以贴到 自己的项目中,工具类来源于鸿洋大神的blog~
SPUtils.java
import android.content.Context;
import android.content.SharedPreferences;
import java.util.Map;
public class SPUtils {
/** * 保存在手机里的SP文件名 */
public static final String FILE_NAME = "my_sp";
/** * 保存数据 */
public static void put(Context context, String key, Object obj) {
SharedPreferences sp = context.getSharedPreferences(FILE_NAME, context.MODE_PRIVATE);
SharedPreferences.Editor editor = sp.edit();
if (obj instanceof Boolean) {
editor.putBoolean(key, (Boolean) obj);
} else if (obj instanceof Float) {
editor.putFloat(key, (Float) obj);
} else if (obj instanceof Integer) {
editor.putInt(key, (Integer) obj);
} else if (obj instanceof Long) {
editor.putLong(key, (Long) obj);
} else {
editor.putString(key, (String) obj);
}
editor.commit();
}
/** * 获取指定数据 */
public static Object get(Context context, String key, Object defaultObj) {
SharedPreferences sp = context.getSharedPreferences(FILE_NAME, context.MODE_PRIVATE);
if (defaultObj instanceof Boolean) {
return sp.getBoolean(key, (Boolean) defaultObj);
} else if (defaultObj instanceof Float) {
return sp.getFloat(key, (Float) defaultObj);
} else if (defaultObj instanceof Integer) {
return sp.getInt(key, (Integer) defaultObj);
} else if (defaultObj instanceof Long) {
return sp.getLong(key, (Long) defaultObj);
} else if (defaultObj instanceof String) {
return sp.getString(key, (String) defaultObj);
}
return null;
}
/** * 删除指定数据 */
public static void remove(Context context, String key) {
SharedPreferences sp = context.getSharedPreferences(FILE_NAME, context.MODE_PRIVATE);
SharedPreferences.Editor editor = sp.edit();
editor.remove(key);
editor.commit();
}
/** * 返回所有键值对 */
public static Map<String, ?> getAll(Context context) {
SharedPreferences sp = context.getSharedPreferences(FILE_NAME, context.MODE_PRIVATE);
Map<String, ?> map = sp.getAll();
return map;
}
/** * 删除所有数据 */
public static void clear(Context context) {
SharedPreferences sp = context.getSharedPreferences(FILE_NAME, context.MODE_PRIVATE);
SharedPreferences.Editor editor = sp.edit();
editor.clear();
editor.commit();
}
/** * 检查key对应的数据是否存在 */
public static boolean contains(Context context, String key) {
SharedPreferences sp = context.getSharedPreferences(FILE_NAME, context.MODE_PRIVATE);
return sp.contains(key);
}
}