Android 系統默認自帶Launcher3 
 

菜單都為雙層模式

各手機大廠的Launcher的菜單模式都為單層

如何將launcher3的菜單模式改為單層模式

        mOverviewPanel = (ViewGroup) findViewById(R.id.overview_panel);
         mWidgetsButton = findViewById(R.id.widget_button);
         mWidgetsButton.setOnClickListener(new OnClickListener() {
diff --git a/packages/apps/Launcher3/src/com/android/launcher3/Workspace.java b/packages/apps/Launcher3/src/com/android/launcher3/Workspace.java
index 
--- a/packages/apps/Launcher3/src/com/android/launcher3/Workspace.java
+++ b/packages/apps/Launcher3/src/com/android/launcher3/Workspace.java
@@  @@ public class Workspace extends PagedView
 
             Runnable resizeRunnable = null;
             if (dropTargetLayout != null && !d.cancelled) {
+
+                if (LauncherAppState.is