[Android]添加全局水印

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需求

在测试版本添加水印，以明确该版本非正式版，仅供测试使用。

效果

正式版本编译时去掉ro.show.testversion=true即可

patch

准备透明背景图片，添加需要显示的文字，如下图：

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diff --git a/device/rockchip/rk3288/system.prop b/device/rockchip/rk3288/system.prop
index daed487570..d519c47ab4 100644
--- a/device/rockchip/rk3288/system.prop
+++ b/device/rockchip/rk3288/system.prop
@@ -47,3 +47,4 @@ ro.adb.secure=0
 ro.rk.displayd.enable=false
 qemu.hw.mainkeys=0
 service.adb.tcp.port=5555
+ro.show.testversion=true
diff --git a/frameworks/base/core/res/res/drawable-hdpi/test_version.png b/frameworks/base/core/res/res/drawable-hdpi/test_version.png
new file mode 100644
index 0000000000..70d118084d
Binary files /dev/null and b/frameworks/base/core/res/res/drawable-hdpi/test_version.png differ
diff --git a/frameworks/base/core/res/res/layout/test_version.xml b/frameworks/base/core/res/res/layout/test_version.xml
new file mode 100644
index 0000000000..e169f1852f
--- /dev/null
+++ b/frameworks/base/core/res/res/layout/test_version.xml
@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2006 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+  
+          http://www.apache.org/licenses/LICENSE-2.0
+  
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+
+<ImageView xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="wrap_content" android:layout_height="wrap_content"
+    android:gravity="center"
+    android:padding="3dp"
+    android:background="@android:color/transparent"
+    android:src="@drawable/test_version"
+    android:alpha="0.3"
+/>
diff --git a/frameworks/base/core/res/res/values/symbols.xml b/frameworks/base/core/res/res/values/symbols.xml
index 81d06afa8d..dcc18ebe0d 100644
--- a/frameworks/base/core/res/res/values/symbols.xml
+++ b/frameworks/base/core/res/res/values/symbols.xml
@@ -1793,6 +1793,7 @@
   <java-symbol type="layout" name="am_compat_mode_dialog" />
   <java-symbol type="layout" name="launch_warning" />
   <java-symbol type="layout" name="safe_mode" />
+  <java-symbol type="layout" name="test_version" />
   <java-symbol type="layout" name="simple_list_item_2_single_choice" />
   <java-symbol type="layout" name="app_error_dialog" />
   <java-symbol type="plurals" name="wifi_available" />
diff --git a/frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java b/frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java
index 9fbd87de44..1edc98b446 100755
--- a/frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java
+++ b/frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java
@@ -13075,6 +13075,28 @@ public final class ActivityManagerService extends ActivityManagerNative
         }
     }
 
+   private View TestVersionView = null;
+   public final void showTestVersionOverlay() {
+       if (null != TestVersionView) {
+           ((WindowManager)mContext.getSystemService(
+               Context.WINDOW_SERVICE)).removeView(TestVersionView);
+       }
+       int resorce = com.android.internal.R.layout.test_version;
+
+       TestVersionView = LayoutInflater.from(mContext).inflate(resorce, null);
+       WindowManager.LayoutParams lp = new WindowManager.LayoutParams();
+       lp.type = WindowManager.LayoutParams.TYPE_SECURE_SYSTEM_OVERLAY;
+       lp.width = WindowManager.LayoutParams.WRAP_CONTENT;
+       lp.height = WindowManager.LayoutParams.WRAP_CONTENT;
+       lp.gravity = Gravity.BOTTOM;
+       lp.format = TestVersionView.getBackground().getOpacity();
+       lp.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
+               | WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE;
+       lp.privateFlags |= WindowManager.LayoutParams.PRIVATE_FLAG_SHOW_FOR_ALL_USERS;
+       ((WindowManager)mContext.getSystemService(
+               Context.WINDOW_SERVICE)).addView(TestVersionView, lp);
+   }
+
     public final void showSafeModeOverlay() {
         View v = LayoutInflater.from(mContext).inflate(
                 com.android.internal.R.layout.safe_mode, null);
diff --git a/frameworks/base/services/java/com/android/server/SystemServer.java b/frameworks/base/services/java/com/android/server/SystemServer.java
index 393f062717..c0033ba04b 100644
--- a/frameworks/base/services/java/com/android/server/SystemServer.java
+++ b/frameworks/base/services/java/com/android/server/SystemServer.java
@@ -1255,10 +1255,14 @@ public final class SystemServer {
         // we are in safe mode.
         //final boolean safeMode = wm.detectSafeMode();
         final boolean safeMode = false;
+        final boolean TestVersion = (SystemProperties.get("ro.show.testversion").equals("true") ? true : false);
         if (safeMode) {
             mActivityManagerService.enterSafeMode();
             // Disable the JIT for the system_server process
             VMRuntime.getRuntime().disableJitCompilation();
+        } else if (TestVersion) {
+            mActivityManagerService.showTestVersionOverlay();
+            VMRuntime.getRuntime().startJitCompilation();
         } else {
             // Enable the JIT for the system_server process
             VMRuntime.getRuntime().startJitCompilation();
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