77 lines
2.8 KiB
Java
77 lines
2.8 KiB
Java
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/*
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* Copyright © 2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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package com.wireguard.android.activity;
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import android.content.SharedPreferences;
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import android.content.res.Resources;
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import android.os.Bundle;
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import android.preference.PreferenceManager;
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import android.support.v7.app.AppCompatActivity;
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import android.support.v7.app.AppCompatDelegate;
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import android.util.Log;
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import java.lang.reflect.Field;
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public abstract class ThemeChangeAwareActivity extends AppCompatActivity implements SharedPreferences.OnSharedPreferenceChangeListener {
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private static final String TAG = "WireGuard/" + ThemeChangeAwareActivity.class.getSimpleName();
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private static Resources lastResources;
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private static boolean lastDarkMode;
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private static synchronized void invalidateDrawableCache(final Resources resources, final boolean darkMode) {
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if (resources == lastResources && darkMode == lastDarkMode)
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return;
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try {
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Field f;
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Object o = resources;
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try {
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f = o.getClass().getDeclaredField("mResourcesImpl");
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f.setAccessible(true);
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o = f.get(o);
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} catch (final Exception ignored) { }
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f = o.getClass().getDeclaredField("mDrawableCache");
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f.setAccessible(true);
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o = f.get(o);
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try {
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o.getClass().getMethod("onConfigurationChange", int.class).invoke(o, -1);
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} catch (final Exception ignored) {
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o.getClass().getMethod("clear").invoke(o);
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}
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} catch (final Exception e) {
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Log.e(TAG, "Failed to flush drawable cache", e);
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}
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lastResources = resources;
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lastDarkMode = darkMode;
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}
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@Override
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protected void onCreate(final Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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PreferenceManager.getDefaultSharedPreferences(this).registerOnSharedPreferenceChangeListener(this);
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}
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@Override
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protected void onDestroy() {
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PreferenceManager.getDefaultSharedPreferences(this).unregisterOnSharedPreferenceChangeListener(this);
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super.onDestroy();
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}
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@Override
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public void onSharedPreferenceChanged(final SharedPreferences sharedPreferences, final String key) {
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if ("dark_theme".equals(key)) {
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final boolean darkMode = sharedPreferences.getBoolean(key, false);
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AppCompatDelegate.setDefaultNightMode(
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sharedPreferences.getBoolean(key, false) ?
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AppCompatDelegate.MODE_NIGHT_YES :
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AppCompatDelegate.MODE_NIGHT_NO);
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invalidateDrawableCache(getResources(), darkMode);
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recreate();
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}
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}
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}
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