android 4.1.2 launcher2实现应用列表背景透明

由于做android系统开发，在研发的平板上希望将launcher2的应用列表背景由黑色修改为透明，苦闷了几天，终于算是完美实现了，在此直接说方法，希望对想要此功能的人有用。

1.将launcher2的源码从packages/apps/Launcher2/下倒入到eclipse中，具体方法见： http://blog.csdn.net/singleton1900/article/details/8806978

2.待成功能编译出Launcher2后，开始修改代码。

3.找到res/layout/apps_customize_pane.xml文件，将

 <com.android.launcher.AppsCustomizeTabHost
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:launcher="http://schemas.android.com/apk/res/com.android.launcher"
     android:background="#FF000000">

修改为:

 <com.android.launcher.AppsCustomizeTabHost
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:launcher="http://schemas.android.com/apk/res/com.android.launcher"
     android:background="#00000000">

4.打开com/android/launcher/Launcher.java代码，将其中的对updateWallpaperVisibility函数的调用参数都修改为true.

5.编译运行，即可看到应用列表背景变为透明。

diff --git a/packages/apps/Launcher2/res/layout/apps_customize_pane.xml b/packages/apps/Launcher2/res/layout/apps_customize_pane.xml
index 41ba9e2..c83b5da 100644
--- a/packages/apps/Launcher2/res/layout/apps_customize_pane.xml
+++ b/packages/apps/Launcher2/res/layout/apps_customize_pane.xml
@@ -16,7 +16,7 @@
 <com.android.launcher2.AppsCustomizeTabHost
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:launcher="http://schemas.android.com/apk/res/com.android.launcher"
-    android:background="#FF000000">
+    android:background="#00000000">
     <LinearLayout
         android:id="@+id/apps_customize_content"
         android:orientation="vertical"
diff --git a/packages/apps/Launcher2/src/com/android/launcher2/Launcher.java b/packages/apps/Launcher2/src/com/android/launcher2/Launcher.jav
index 433b0ba..ccfbc44 100755
--- a/packages/apps/Launcher2/src/com/android/launcher2/Launcher.java
+++ b/packages/apps/Launcher2/src/com/android/launcher2/Launcher.java
@@ -2420,7 +2420,7 @@ public final class Launcher extends Activity
         if (isAllAppsVisible()) {
             if (mAppsCustomizeTabHost != null &&
                     !mAppsCustomizeTabHost.isTransitioning()) {
-                updateWallpaperVisibility(false);
+                updateWallpaperVisibility(true);
             }
         }
     }
@@ -2599,7 +2599,7 @@ public final class Launcher extends Activity
                         hideDockDivider();
                     }
                     if (!animationCancelled) {
-                        updateWallpaperVisibility(false);
+                        updateWallpaperVisibility(true);
                     }
 
                     // Hide the search bar
@@ -2693,7 +2693,7 @@ public final class Launcher extends Activity
             dispatchOnLauncherTransitionPrepare(toView, animated, false);
             dispatchOnLauncherTransitionStart(toView, animated, false);
             dispatchOnLauncherTransitionEnd(toView, animated, false);
-            updateWallpaperVisibility(false);
+            updateWallpaperVisibility(true);
         }
     }