PrefUtil.java

package com.afollestad.materialdialogs.prefs;

import android.content.Context;
import android.content.res.TypedArray;
import android.content.res.XmlResourceParser;
import android.preference.Preference;
import android.preference.PreferenceManager;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.util.AttributeSet;

import com.afollestad.materialdialogs.commons.R;

import java.lang.reflect.Method;

/** @author Aidan Follestad (afollestad) */
class PrefUtil {

  private PrefUtil() {}

  static void setLayoutResource(
      @NonNull Context context, @NonNull Preference preference, @Nullable AttributeSet attrs) {
    boolean foundLayout = false;
    if (attrs != null) {
      for (int i = 0; i < attrs.getAttributeCount(); i++) {
        final String namespace = ((XmlResourceParser) attrs).getAttributeNamespace(0);
        if (namespace.equals("http://schemas.android.com/apk/res/android")
            && attrs.getAttributeName(i).equals("layout")) {
          foundLayout = true;
          break;
        }
      }
    }

    boolean useStockLayout = false;
    if (attrs != null) {
      TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.Preference, 0, 0);
      try {
        useStockLayout = a.getBoolean(R.styleable.Preference_useStockLayout, false);
      } finally {
        a.recycle();
      }
    }

    if (!foundLayout && !useStockLayout) {
      preference.setLayoutResource(R.layout.md_preference_custom);
    }
  }

  static void registerOnActivityDestroyListener(
      @NonNull Preference preference,
      @NonNull PreferenceManager.OnActivityDestroyListener listener) {
    try {
      PreferenceManager pm = preference.getPreferenceManager();
      Method method =
          pm.getClass()
              .getDeclaredMethod(
                  "registerOnActivityDestroyListener",
                  PreferenceManager.OnActivityDestroyListener.class);
      method.setAccessible(true);
      method.invoke(pm, listener);
    } catch (Exception ignored) {
    }
  }

  static void unregisterOnActivityDestroyListener(
      @NonNull Preference preference,
      @NonNull PreferenceManager.OnActivityDestroyListener listener) {
    try {
      PreferenceManager pm = preference.getPreferenceManager();
      Method method =
          pm.getClass()
              .getDeclaredMethod(
                  "unregisterOnActivityDestroyListener",
                  PreferenceManager.OnActivityDestroyListener.class);
      method.setAccessible(true);
      method.invoke(pm, listener);
    } catch (Exception ignored) {
    }
  }
}