Add PreferenceUtils to registerOnActivityDestroyListener and unregisterOnActivityDestroyListener

app/src/main/java/com/hippo/preference/PreferenceUtils.java

@@ -0,0 +1,99 @@
+/*
+ * Copyright 2016 Hippo Seven
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hippo.preference;
+
+import android.preference.Preference;
+import android.preference.PreferenceManager;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+
+public final class PreferenceUtils {
+    private PreferenceUtils() {}
+
+    private static final Method mRegisterOnActivityDestroyListener;
+    private static final Method mUnregisterOnActivityDestroyListener;
+
+    static {
+        Method method;
+        Class<?> clazz = PreferenceManager.class;
+
+        method = null;
+        try {
+            method = clazz.getDeclaredMethod("registerOnActivityDestroyListener",
+                    PreferenceManager.OnActivityDestroyListener.class);
+            if (null != method) {
+                method.setAccessible(true);
+            }
+        } catch (NoSuchMethodException e) {
+            e.printStackTrace();
+        }
+        mRegisterOnActivityDestroyListener = method;
+
+        method = null;
+        try {
+            method = clazz.getDeclaredMethod("unregisterOnActivityDestroyListener",
+                    PreferenceManager.OnActivityDestroyListener.class);
+            if (null != method) {
+                method.setAccessible(true);
+            }
+        } catch (NoSuchMethodException e) {
+            e.printStackTrace();
+        }
+        mUnregisterOnActivityDestroyListener = method;
+    }
+
+    @SuppressWarnings("TryWithIdenticalCatches")
+    public static void registerOnActivityDestroyListener(Preference preference,
+            PreferenceManager.OnActivityDestroyListener listener) {
+        if (null == mRegisterOnActivityDestroyListener || null == preference || null == listener) {
+            return;
+        }
+        PreferenceManager preferenceManager = preference.getPreferenceManager();
+        if (null == preferenceManager) {
+            return;
+        }
+
+        try {
+            mRegisterOnActivityDestroyListener.invoke(preferenceManager, listener);
+        } catch (IllegalAccessException e) {
+            e.printStackTrace();
+        } catch (InvocationTargetException e) {
+            e.printStackTrace();
+        }
+    }
+
+    @SuppressWarnings("TryWithIdenticalCatches")
+    public static void unregisterOnActivityDestroyListener(Preference preference,
+            PreferenceManager.OnActivityDestroyListener listener) {
+        if (null == mUnregisterOnActivityDestroyListener || null == preference || null == listener) {
+            return;
+        }
+        PreferenceManager preferenceManager = preference.getPreferenceManager();
+        if (null == preferenceManager) {
+            return;
+        }
+
+        try {
+            mUnregisterOnActivityDestroyListener.invoke(preferenceManager, listener);
+        } catch (IllegalAccessException e) {
+            e.printStackTrace();
+        } catch (InvocationTargetException e) {
+            e.printStackTrace();
+        }
+    }
+}