RK3399 Android7.1系统如何在设置里打开返回按键呢

Platform: RK3399
OS: Android 7.1
Kernel: v4.4.83

原因：

在没有物理按键和导航栏的情况下没法退出设置界面，不过app里有自带此功能，只是默认关闭的。

方法：

diff --git a/src/com/android/settings/SettingsActivity.java b/src/com/android/settings/SettingsActivity.java
index 1a615d8..e53d42b 100644
--- a/src/com/android/settings/SettingsActivity.java
+++ b/src/com/android/settings/SettingsActivity.java
[url=home.php?mod=space&uid=1999721]@@[/url] -629,7 +629,8 @@ public class SettingsActivity extends SettingsDrawerActivity
mInitialTitleResId, mInitialTitle, false);
} else {
// No UP affordance if we are displaying the main Dashboard

 mDisplayHomeAsUpEnabled = false;

//Kris,180724, show back key.

mDisplayHomeAsUpEnabled = true;
            // Show Search affordance
            mDisplaySearch = true;
            mInitialTitleResId = R.string.dashboard_title;

改动后效果：

原作者：KrisFei