未隐藏前
Launcher
是桌面的Activity，管理和展示桌面的应用图标，它的布局文件是Launcher.xml
Launcher.xml布局文件
<com.android.launcher3.LauncherRootView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:launcher="http://schemas.android.com/apk/res-auto"
android:id="@+id/launcher"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<com.android.launcher3.dragndrop.DragLayer
android:id="@+id/drag_layer"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clipChildren="false"
android:clipToPadding="false"
android:importantForAccessibility="no">
<com.android.launcher3.views.AccessibilityActionsView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:contentDescription="@string/home_screen"
/>
<!-- The workspace contains 5 screens of cells -->
<!-- DO NOT CHANGE THE ID -->
<com.android.launcher3.Workspace
android:id="@+id/workspace"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:theme="@style/HomeScreenElementTheme"
launcher:pageIndicator="@+id/page_indicator" />
<!-- DO NOT CHANGE THE ID -->
<!--Hotseat的布局 -->
<include
android:id="@+id/hotseat"
android:visibility="gone"
layout="@layout/hotseat" />
<!-- Keep these behind the workspace so that they are not visible when
we go into AllApps -->
<com.android.launcher3.pageindicators.WorkspacePageIndicator
android:id="@+id/page_indicator"
android:layout_width="match_parent"
android:layout_height="@dimen/workspace_page_indicator_height"
android:layout_gravity="bottom|center_horizontal"
android:theme="@style/HomeScreenElementTheme" />
<include
android:id="@+id/drop_target_bar"
layout="@layout/drop_target_bar" />
<com.android.launcher3.views.ScrimView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/scrim_view"
android:background="@android:color/transparent" />
<include
android:id="@+id/apps_view"
layout="@layout/all_apps"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<include
android:id="@+id/overview_panel"
layout="@layout/overview_panel" />
</com.android.launcher3.dragndrop.DragLayer>
</com.android.launcher3.LauncherRootView>
单纯的添加android:visibility="gone”并不能隐藏Hotseat
Launcher在onCreate()方法时候通过initDeviceProfile()方法会初始化DeviceProfile
DeviceProfile用来配置Icon大小、间距，也用来配置Hotseat的高度、内容大小
DeviceProfile的Builder
public DeviceProfile build() {
if (mWindowBounds == null) {
throw new IllegalArgumentException("Window bounds not set");
}
if (mTransposeLayoutWithOrientation == null) {
mTransposeLayoutWithOrientation = !mInfo.isTablet(mWindowBounds);
}
if (mIsGestureMode == null) {
mIsGestureMode = mInfo.navigationMode.hasGestures;
}
if (mDotRendererCache == null) {
mDotRendererCache = new SparseArray<>();
}
if (mViewScaleProvider == null) {
mViewScaleProvider = DEFAULT_PROVIDER;
}
return new DeviceProfile(mContext, mInv, mInfo, mWindowBounds, mDotRendererCache,
mIsMultiWindowMode, mTransposeLayoutWithOrientation, mIsMultiDisplay,
mIsGestureMode, mViewScaleProvider);
}
DeviceProfile(Context context, InvariantDeviceProfile inv, Info info, WindowBounds windowBounds,
SparseArray<DotRenderer> dotRendererCache, boolean isMultiWindowMode,
boolean transposeLayoutWithOrientation, boolean isMultiDisplay, boolean isGestureMode,
@NonNull final ViewScaleProvider viewScaleProvider) {
...
if (inv.folderStyle != INVALID_RESOURCE_HANDLE) {
TypedArray folderStyle = context.obtainStyledAttributes(inv.folderStyle,
R.styleable.FolderDisplayStyle);
// These are re-set in #updateFolderCellSize if the grid is not scalable
folderCellHeightPx = folderStyle.getDimensionPixelSize(
R.styleable.FolderDisplayStyle_folderCellHeight, 0);
folderCellWidthPx = folderStyle.getDimensionPixelSize(
R.styleable.FolderDisplayStyle_folderCellWidth, 0);
folderContentPaddingTop = folderStyle.getDimensionPixelSize(
R.styleable.FolderDisplayStyle_folderTopPadding, 0);
folderCellLayoutBorderSpacePx = folderStyle.getDimensionPixelSize(
R.styleable.FolderDisplayStyle_folderBorderSpace, 0);
folderFooterHeightPx = folderStyle.getDimensionPixelSize(
R.styleable.FolderDisplayStyle_folderFooterHeight, 0);
folderStyle.recycle();
} else {
folderCellLayoutBorderSpacePx = 0;
folderFooterHeightPx = 0;
folderContentPaddingTop = res.getDimensionPixelSize(R.dimen.folder_top_padding_default);
}
cellLayoutBorderSpacePx = getCellLayoutBorderSpace(inv);
cellLayoutBorderSpaceOriginalPx = new Point(cellLayoutBorderSpacePx);
allAppsBorderSpacePx = new Point(
pxFromDp(inv.allAppsBorderSpaces[mTypeIndex].x, mMetrics),
pxFromDp(inv.allAppsBorderSpaces[mTypeIndex].y, mMetrics));
workspacePageIndicatorHeight = res.getDimensionPixelSize(
R.dimen.workspace_page_indicator_height);
mWorkspacePageIndicatorOverlapWorkspace =
res.getDimensionPixelSize(R.dimen.workspace_page_indicator_overlap_workspace);
...
hotseatBarSidePaddingEndPx =
res.getDimensionPixelSize(R.dimen.dynamic_grid_hotseat_side_padding);
// Add a bit of space between nav bar and hotseat in vertical bar layout.
hotseatBarSidePaddingStartPx = isVerticalBarLayout() ? workspacePageIndicatorHeight : 0;
//这里是修改Hotseat的高度
updateHotseatSizes(pxFromDp(inv.iconSize[INDEX_DEFAULT], mMetrics));
private void updateHotseatSizes(int hotseatIconSizePx) {
// Ensure there is enough space for folder icons, which have a slightly larger radius.
hotseatCellHeightPx = (int) Math.ceil(hotseatIconSizePx * ICON_OVERLAP_FACTOR);
if (isVerticalBarLayout()) {
hotseatBarSizePx = hotseatIconSizePx + hotseatBarSidePaddingStartPx
+ hotseatBarSidePaddingEndPx;
} else if (isQsbInline) {
hotseatBarSizePx = Math.max(hotseatIconSizePx, hotseatQsbVisualHeight)
+ hotseatBarBottomSpacePx;
} else {
hotseatBarSizePx = hotseatIconSizePx
+ hotseatQsbSpace
+ hotseatQsbVisualHeight
+ hotseatBarBottomSpacePx;
}
//这里直接赋值为0，可以实现隐藏效果
hotseatBarSizePx = 0;
}
效果
