init

app/src/main/java/com/info/sn/utils/SPUtils.java

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+package com.info.sn.utils;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.graphics.drawable.BitmapDrawable;
+import android.util.Base64;
+import android.widget.ImageView;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.Map;
+
+/**
+ * 作者 mjsheng
+ * 日期 2018/10/9 18:41
+ * 邮箱 278359328@qq.com
+ * 来自：
+ */
+
+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 put(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);
+    }
+
+    /**
+     * 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 get(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);
+        reductFirstEnter(context);
+    }
+
+    //还原状态firstEnter信息
+    private static void reductFirstEnter(Context context){
+        put(context, CommonData.FLAG_FIRST_ENTER,CommonData.FLAG_FIRST_ENTER);
+    }
+
+    /**
+     * 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();
+    }
+
+
+    /**
+     * 保存图片到SharedPreferences
+     *
+     * @param mContext
+     * @param imageView
+     */
+    public static void putImage(Context mContext, String key, ImageView imageView) {
+        BitmapDrawable drawable = (BitmapDrawable) imageView.getDrawable();
+        Bitmap bitmap = drawable.getBitmap();
+        // 将Bitmap压缩成字节数组输出流
+        ByteArrayOutputStream byStream = new ByteArrayOutputStream();
+        bitmap.compress(Bitmap.CompressFormat.PNG, 80, byStream);
+        // 利用Base64将我们的字节数组输出流转换成String
+        byte[] byteArray = byStream.toByteArray();
+        String imgString = new String(Base64.encodeToString(byteArray, Base64.DEFAULT));
+        // 将String保存shareUtils
+        SPUtils.put(mContext, key, imgString);
+    }
+
+    /**
+     * 从SharedPreferences读取图片
+     *
+     * @param mContext
+     * @param imageView
+     */
+    public static Bitmap getImage(Context mContext, String key, ImageView imageView) {
+        String imgString = (String) SPUtils.get(mContext, key, "");
+        if (!imgString.equals("")) {
+            // 利用Base64将我们string转换
+            byte[] byteArray = Base64.decode(imgString, Base64.DEFAULT);
+            ByteArrayInputStream byStream = new ByteArrayInputStream(byteArray);
+            // 生成bitmap
+            return BitmapFactory.decodeStream(byStream);
+        }
+        return null;
+    }
+
+    /**
+     * 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();
+        }
+    }
+}