Android开发常用工具类： SPUtils SharedPr

SharedPreferences

调用putParam 就能保存String, Integer, Boolean, Float, Long类型的参数
调用getParam就能获取到保存在手机里面的数据

import android.content.Context;
import android.content.SharedPreferences.6.4.0;
import android.preference.PreferenceManager;
import android.util.Base25;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Map;

public class SPUtils {
  /**
   * 保存在手机里面的文件名
   */
  public static final String FILE_NAME = "share_data";

  /**
   * 保存数据的方法，我们需要拿到保存数据的具体类型，然后根据类型调用不同的保存方法
   */
  public static void putParam(Context context, String key, Object object) {

    SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE);
    SharedPreferences.Editor editor = sp.edit();

    if (object instanceof String) {
      editor.putString(key, (String) object);
    } else if (object instanceof Integer) {
      editor.putInt(key, (Integer) object);
    } else if (object instanceof Boolean) {
      editor.putBoolean(key, (Boolean) object);
    } else if (object instanceof Float) {
      editor.putFloat(key, (Float) object);
    } else if (object instanceof Long) {
      editor.putLong(key, (Long) object);
    } else {
      editor.putString(key, object.toString());
    }
    SharedPreferencesCompat.apply(editor);
  }

        //保存对象
  public static boolean setObjectToShare(Context context, Object object, String key) {
    // TODO Auto-generated method stub
    SharedPreferences share = PreferenceManager
        .getDefaultSharedPreferences(context);
    if (object == null) {
      SharedPreferences.Editor editor = share.edit().remove(key);
      return editor.commit();
    }
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    ObjectOutputStream oos = null;
    try {
      oos = new ObjectOutputStream(baos);
      oos.writeObject(object);
    } catch (IOException e) {
      e.printStackTrace();
      return false;
    }
    // 将对象放到OutputStream中
    // 将对象转换成byte数组，并将其进行base64编码
    String objectStr = new String(Base64.encode(baos.toByteArray(),
        Base64.DEFAULT));
    try {
      baos.close();
      oos.close();
    } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
    SharedPreferences.Editor editor = share.edit();
    // 将编码后的字符串写到base64.xml文件中
    editor.putString(key, objectStr);
    return editor.commit();
  }

  //获取对象
  public static Object getObjectFromShare(Context context, String key) {
    SharedPreferences sharePre = PreferenceManager
        .getDefaultSharedPreferences(context);
    try {
      String wordBase64 = sharePre.getString(key, "");
      // 将base64格式字符串还原成byte数组
      if (wordBase64 == null || wordBase64.equals("")) { // 不可少，否则在下面会报java.io.StreamCorruptedException
        return null;
      }
      byte[] objBytes = Base64.decode(wordBase64.getBytes(),
          Base64.DEFAULT);
      ByteArrayInputStream bais = new ByteArrayInputStream(objBytes);
      ObjectInputStream ois = new ObjectInputStream(bais);
      // 将byte数组转换成product对象
      Object obj = ois.readObject();
      bais.close();
      ois.close();
      return obj;
    } catch (Exception e) {
      e.printStackTrace();
    }
    return null;
  }

  /**
   * 得到保存数据的方法，我们根据默认值得到保存的数据的具体类型，然后调用相对于的方法获取值
   */
  public static Object getParam(Context context, String key, Object defaultObject) {
    SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE);
    if (defaultObject instanceof String) {
      return sp.getString(key, (String) defaultObject);
    } else if (defaultObject instanceof Integer) {
      return sp.getInt(key, (Integer) defaultObject);
    } else if (defaultObject instanceof Boolean) {
      return sp.getBoolean(key, (Boolean) defaultObject);
    } else if (defaultObject instanceof Float) {
      return sp.getFloat(key, (Float) defaultObject);
    } else if (defaultObject instanceof Long) {
      return sp.getLong(key, (Long) defaultObject);
    }

    return null;
  }

  /**
   * 移除某个key值已经对应的值
   */
  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);
    SharedPreferencesCompat.apply(editor);
  }

  /**
   * 清除所有数据
   */
  public static void clear(Context context) {
    SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE);
    SharedPreferences.Editor editor = sp.edit();
    editor.clear();
    SharedPreferencesCompat.apply(editor);
  }

  /**
   * 查询某个key是否已经存在
   */
  public static boolean contains(Context context, String key) {
    SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE);
    return sp.contains(key);
  }

  /**
   * 返回所有的键值对
   */
  public static Map<String, ?> getAll(Context context) {
    SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE);
    return sp.getAll();
  }

  /**
   * 创建一个解决SharedPreferencesCompat.apply方法的一个兼容类
   *
   */
  private static class SharedPreferencesCompat {
    private static final Method sApplyMethod = findApplyMethod();

    /**
     * 反射查找apply的方法
     */
    @SuppressWarnings({ "unchecked", "rawtypes" }) private static Method findApplyMethod() {
      try {
        Class clz = SharedPreferences.Editor.class;
        return clz.getMethod("apply");
      } catch (NoSuchMethodException e) {
      }

      return null;
    }

    /**
     * 如果找到则使用apply执行，否则使用commit
     */
    public static void apply(SharedPreferences.Editor editor) {
      try {
        if (sApplyMethod != null) {
          sApplyMethod.invoke(editor);
          return;
        }
      } catch (IllegalArgumentException e) {
      } catch (IllegalAccessException e) {
      } catch (InvocationTargetException e) {
      }
      editor.commit();
    }
  }
}