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在应用开发中会经常遇到要求实现夜间模式或者主题切换
具体例子如下，我会先讲解第一种方法。
我今天主要是详述第一种的实现方式：
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<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme">
</application>
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<style name="AppTheme"/>
<style name="AppTheme.Light">
<item name="root_background">@color/white</item>
</style>
<style name="AppTheme.Dark">
<item name="root_background">@color/black</item>
</style>
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<declare-styleable name="Theme">
<attr name="root_background" format="reference|color" />
</declare-styleable>
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<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="?attr/root_background">
</RelativeLayout>
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@Override
protected void onCreate(Bundle savedInstanceState) {
setTheme();
super.onCreate(savedInstanceState);
}
private void setTheme() {
mCurrentThemeResourceID = getThemeResourceID();
setTheme(mCurrentThemeResourceID);
}
private int getThemeResourceID() {
mIsNightModule = PreferencesUtils.getBoolean(this, getResources().getString(R.string.is_night_mode));
return mIsNightModule ? R.style.AppTheme_Dark : R.style.AppTheme_Light;
}
public static void restartActivity(final Activity activity) {
if (activity == null) return;
final int enter_anim = android.R.anim.fade_in;
final int exit_anim = android.R.anim.fade_out;
activity.overridePendingTransition(enter_anim, exit_anim);
activity.finish();
activity.overridePendingTransition(enter_anim, exit_anim);
activity.startActivity(activity.getIntent());
}
private final boolean isThemeChanged() {
return getThemeResourceID() != mCurrentThemeResourceID;
}
@Override
protected void onResume() {
super.onResume();
if (isThemeChanged()) {
restartActivity(this);
}
}
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可用此方式实现多种theme的切换
以后会发博文讲解如何实现主题下载，主题切换等功能。
如果想和我讨论，请在下面评论即可。
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原文地址：http://www.cnblogs.com/renkangke/p/4189503.html
