[RK3399][Android7.1] 调试笔记 --- 设置里打开返回按键

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.javaindex 1a615d8..e53d42b 100644--- a/src/com/android/settings/SettingsActivity.java+++ b/src/com/android/settings/SettingsActivity.java@@ -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：

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