Android-Framework 默认隐藏导航栏，添加控制显示属性

一、环境

高通865 Android 10

二、源码修改

device/qcom/qssi/system.prop

@@ -217,3 +217,5 @@ persist.ruichi.gpu=2persist.ruichi.gpu_max=587persist.ruichi.gpu_min=305+# Show navigation bar, 0 for display, 1 for hidden
+persist.navbar.status=1

frameworks/base/services/core/java/com/android/server/wm/DisplayPolicy.java

@@ -737,7 +737,7 @@ public class DisplayPolicy {// Allow a system property to override this. Used by the emulator.// See also hasNavigationBar().
-            String navBarOverride = SystemProperties.get("qemu.hw.mainkeys");
+            String navBarOverride = SystemProperties.get("persist.navbar.status");  //qemu.hw.mainkeysif ("1".equals(navBarOverride)) {mHasNavigationBar = false;} else if ("0".equals(navBarOverride)) {