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