1.添加CurrentAppSharedPreferencesUtils用来保存数据，不删除这个数据。

app/src/main/java/com/xhly/manageapp/utils/CurrentAppSharedPreferencesUtils.java

@@ -0,0 +1,157 @@
+package com.xhly.manageapp.utils;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.text.TextUtils;
+import android.util.Log;
+
+import com.google.gson.Gson;
+
+import java.lang.reflect.Type;
+
+public class CurrentAppSharedPreferencesUtils {
+    /**
+     * 保存在手机里面的文件名
+     */
+    public static final String SP_FILE_NAME = "ManageAppData";
+    private SharedPreferences preferences;
+    private static CurrentAppSharedPreferencesUtils instance;
+
+
+    private CurrentAppSharedPreferencesUtils(Context context) {
+        preferences = context.getSharedPreferences(SP_FILE_NAME, Context.MODE_PRIVATE);
+    }
+
+    /**
+     * 单例模式的SharedPreferencesUtil
+     */
+    public static CurrentAppSharedPreferencesUtils getInstance(Context context) {
+        if (instance == null) {
+            synchronized (CurrentAppSharedPreferencesUtils.class) {
+                if (instance == null) {
+                    instance = new CurrentAppSharedPreferencesUtils(context);
+                }
+            }
+        }
+        return instance;
+    }
+
+
+    //    *
+//     * 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
+//     * @param context
+//     * @param key
+//     * @param object
+//
+    public boolean setParam(String key, Object object) {
+
+        String type = object.getClass().getSimpleName();
+        SharedPreferences.Editor editor = preferences.edit();
+
+        if ("String".equals(type)) {
+            editor.putString(key, (String) object);
+        } else if ("Integer".equals(type)) {
+            editor.putInt(key, (Integer) object);
+        } else if ("Boolean".equals(type)) {
+            editor.putBoolean(key, (Boolean) object);
+        } else if ("Float".equals(type)) {
+            editor.putFloat(key, (Float) object);
+        } else if ("Long".equals(type)) {
+            editor.putLong(key, (Long) object);
+        }
+
+        editor.apply();
+        return false;
+    }
+
+
+    //   *
+//     * 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
+//     * @param context
+//     * @param key
+//     * @param defaultObject
+//     * @return
+    public Object getParam(String key, Object defaultObject) {
+        String type = defaultObject.getClass().getSimpleName();
+        SharedPreferences sp = preferences;
+
+        if ("String".equals(type)) {
+            return sp.getString(key, (String) defaultObject);
+        } else if ("Integer".equals(type)) {
+            return sp.getInt(key, (Integer) defaultObject);
+        } else if ("Boolean".equals(type)) {
+            return sp.getBoolean(key, (Boolean) defaultObject);
+        } else if ("Float".equals(type)) {
+            return sp.getFloat(key, (Float) defaultObject);
+        } else if ("Long".equals(type)) {
+            return sp.getLong(key, (Long) defaultObject);
+        }
+
+        return null;
+    }
+
+
+    /**
+     * 保存对象到json对象
+     *
+     * @param object 播放列表对象
+     */
+    public void saveJson(String key, Object object) {
+        String strJson = "";
+        Gson gson = new Gson();
+        strJson = gson.toJson(object);
+        SharedPreferences.Editor edit = preferences.edit();
+        if (edit != null) {
+            edit.putString(key, strJson);
+            edit.apply();
+        }
+    }
+
+    public void clearJson(String key) {
+        SharedPreferences.Editor edit = preferences.edit();
+        if (edit != null) {
+            edit.putString(key, "");
+            edit.apply();
+        }
+    }
+
+    /**
+     * 读取object对象
+     *
+     * @return
+     */
+    public <T> Object getFromJson(String key, Class<T> cls) {
+        try {
+            String json = preferences.getString(key, "");
+            if (TextUtils.isEmpty(json)) {
+                Log.d("转换失败", "数据为空");
+                return null;
+            }
+            Gson gson = new Gson();
+            return gson.fromJson(json, cls);
+        } catch (Exception e) {
+            Log.d("转换失败", e.toString());
+            return null;
+        }
+    }
+
+    public <T> Object getFromJsonType(String key, Class<T> cls, Type type) {
+        try {
+            String json = preferences.getString(key, "");
+            if (TextUtils.isEmpty(json)) {
+                Log.d("转换失败", "数据为空");
+                return null;
+            }
+            Gson gson = new Gson();
+            return gson.fromJson(json, type);
+        } catch (Exception e) {
+            Log.d("转换失败", e.toString());
+            return null;
+        }
+    }
+
+    public String get(String key) {
+        return preferences.getString(key, "");
+    }
+
+}