Android 7.0 Launcher3 去掉应用抽屉
年初做过一个项目，有一个需求就是需要将桌面变为单层不需要二级菜单。最近几次有小伙伴有这个问我这个解决办法。现在我将分享给大家。
先上效果图：
功能分解
- 去除Allapp键，调整HotSeat布局
- 将所有应用摆在launcher第一层
- 去掉长按时删除选项
解决方案
一，设置总开关
按照6.0 Launcher3 的模式，添加一个开关，控制是否去掉抽屉。
LauncherAppState类：单例模式，主要在启动的时候用，他初始化了一些对象，并且注册了广播监听器和ContentObserver。为了能灵活切换模式,在此类中添加静态开关。
Launcher3\src\com\android\launcher3\LauncherAppState.java：
public static boolean isDisableAllApps() {
// Returns false on non-dogfood builds.
return android.os.SystemProperties.get("ro.wind.launcher3.ishome2","0").equals("1");
}二，Allapp键的加载
在HotSeat里面去掉Allapp键的加载 ，屏蔽isAllAppsButtonRank()占用allapp位置。
1) 不再占用allapp位置
2) 在加载Workspace时,会留出HotSeat的第三个位置给allapp按钮,若不取消该位置的占用,在HotSeat加载时会留出空位。HotSeat的初始化在HotSeat.java中
Launcher3\src\com\android\launcher3\HotSeat.java –>isAllAppsButtonRank()：
public boolean isAllAppsButtonRank(int rank) {
//添加 @{
if (LauncherAppState.isDisableAllApps()) {
return false;
}
//添加 @}
return rank == mAllAppsButtonRank;
}3) Home2没有抽屉，所以不需要allapp按钮。在HotSeat里面去掉Allapp键的加载，在HotSeat.java 的void resetLayout()中初始化HotSeat布局。在Home2时停止加载Allapp按钮。
Launcher3\src\com\android\launcher3\HotSeat.java –>resetLayout():
void resetLayout() {
mContent.removeAllViewsInLayout();
//添加 @{
if(LauncherAppState.isDisableAllApps()){
//添加 }@
// Add the Apps button
Context context = getContext();
LayoutInflater inflater = LayoutInflater.from(context);
TextView allAppsButton = (TextView)
inflater.inflate(R.layout.all_apps_button, mContent, false);
Drawable d = context.getResources().getDrawable(R.drawable.all_apps_button_icon);
mLauncher.resizeIconDrawable(d);
allAppsButton.setCompoundDrawables(null, d, null, null);
allAppsButton.setContentDescription(context.getString(R.string.all_apps_button_label));
allAppsButton.setOnKeyListener(new HotseatIconKeyEventListener());
if (mLauncher != null) {
mLauncher.setAllAppsButton(allAppsButton);
allAppsButton.setOnTouchListener(mLauncher.getHapticFeedbackTouchListener());
allAppsButton.setOnClickListener(mLauncher);
allAppsButton.setOnLongClickListener(mLauncher);
allAppsButton.setOnFocusChangeListener(mLauncher.mFocusHandler);
}
// Note: We do this to ensure that the hotseat is always laid out in the orientation of
// the hotseat in order regardless of which orientation they were added
int x = getCellXFromOrder(mAllAppsButtonRank);
int y = getCellYFromOrder(mAllAppsButtonRank);
CellLayout.LayoutParams lp = new CellLayout.LayoutParams(x,y,1,1);
lp.canReorder = false;
mContent.addViewToCellLayout(allAppsButton, -1, allAppsButton.getId(), lp, true);
}
}//别漏了这里的 }三，数据初始化类中更改HotSeat布局
InvariantDeviceProfile.java Launcher3进行布局初始化的一个类。
在有allapp按钮时HotSeat里Hotseat图标数量为五个，没有allapp按钮时Hotseat图标数量应为四个。
Launcher3\src\com\android\launcher3\InvariantDeviceProfile.java:
1）先加个宏控
//添加 @{
private boolean hasDA = LauncherAppState.isDisableAllApps();
//添加 }@2)去掉抽屉时，HotSeat的格数为四格，所以不能抛出异常。 （ numHotseatIcons 为偶时不抛异常）
InvariantDeviceProfile( )：
InvariantDeviceProfile(String n, float w, float h, int r, int c, int fr, int fc, int maapc,
// Ensure that we have an odd number of hotseat items (since we need to place all apps)
if (hs % 2 == 0&& !hasDA) {// 在无抽屉情况下不抛异常
throw new RuntimeException("All Device Profiles must have an odd number of hotseat spaces");
}
name = n;
... ...
}3）去掉抽屉的情况下加载不同的布局
getPredefinedDeviceProfiles() :
ArrayList getPredefinedDeviceProfiles() {
ArrayList predefinedDeviceProfiles = new ArrayList<>();
// width, height, #rows, #columns, #folder rows, #folder columns,
// iconSize, iconTextSize, #hotseat, #hotseatIconSize, defaultLayoutId.
predefinedDeviceProfiles.add(new InvariantDeviceProfile("Super Short Stubby",
255, 300, 2, 3, 2, 3, 3, 48, 13, 3, 48, R.xml.default_workspace_4x4));
predefinedDeviceProfiles.add(new InvariantDeviceProfile("Shorter Stubby",
255, 400, 3, 3, 3, 3, 3, 48, 13, 3, 48, R.xml.default_workspace_4x4));
predefinedDeviceProfiles.add(new InvariantDeviceProfile("Short Stubby",
275, 420, 3, 4, 3, 4, 4, 48, 13, (hasDA ? 4 : 5), 48, (hasDA ? R.xml.default_workspace_4x4_no_all_apps : R.xml.default_workspace_4x4 )));
predefinedDeviceProfiles.add(new InvariantDeviceProfile("Stubby",
255, 450, 3, 4, 3, 4, 4, 48, 13, (hasDA ? 4 : 5), 48, (hasDA ? R.xml.default_workspace_4x4_no_all_apps : R.xml.default_workspace_4x4 )));
predefinedDeviceProfiles.add(new InvariantDeviceProfile("Nexus S",
296, 491.33f, 4, 4, 4, 4, 4, 48, 13,(hasDA ? 4 : 5), 48, (hasDA ? R.xml.default_workspace_4x4_no_all_apps : R.xml.default_workspace_4x4 )));
predefinedDeviceProfiles.add(new InvariantDeviceProfile("Nexus 4",
335, 567, 4, 4, 4, 4, 4, DEFAULT_ICON_SIZE_DP, 13, (hasDA ? 4 : 5), 56, (hasDA ? R.xml.default_workspace_4x4_no_all_apps : R.xml.default_workspace_4x4 )));
predefinedDeviceProfiles.add(new InvariantDeviceProfile("Nexus 5",
359, 567, 4, 4, 4, 4, 4, DEFAULT_ICON_SIZE_DP, 13,(hasDA ? 4 : 5), 56, (hasDA ? R.xml.default_workspace_4x4_no_all_apps : R.xml.default_workspace_4x4 )));
predefinedDeviceProfiles.add(new InvariantDeviceProfile("Large Phone",
406, 694, 5, 5, 4, 4, 4, 64, 14.4f, 5, 56, R.xml.default_workspace_5x5));
// The tablet profile is odd in that the landscape orientation
// also includes the nav bar on the side
predefinedDeviceProfiles.add(new InvariantDeviceProfile("Nexus 7",
575, 904, 5, 6, 4, 5, 4, 72, 14.4f, 7, 60, R.xml.default_workspace_5x6));
// Larger tablet profiles always have system bars on the top & bottom
predefinedDeviceProfiles.add(new InvariantDeviceProfile("Nexus 10",
727, 1207, 5, 6, 4, 5, 4, 76, 14.4f, 7, 64, R.xml.default_workspace_5x6));
predefinedDeviceProfiles.add(new InvariantDeviceProfile("20-inch Tablet",
1527, 2527, 7, 7, 6, 6, 4, 100, 20, 7, 72, R.xml.default_workspace_4x4));
return predefinedDeviceProfiles;
} 5)记得改下 dw_phone_hotseat.xml 的布局 ，因为Hotseat只有5格了。
四，将所有应用放在第一层
launcher3加载流程：进入 LauncherApplication -> LauncherAppState -> 进行初始化环境（通过传递sContext）。进行事件监听&&初始化一些环境。例如：横竖屏、当局语言、像素密度、小部件和快捷图标数据库操作对象、应用图标缓存对象、初始化LauncherMode等。在初始化过后，从Launcher的Oncreate方法入手。mModel.startLoader(mWorkspace.getRestorePage());里加载数据 。在加载完成所有快捷方式后将其余为加载完的应用布局在第一层。
1) 成所有快捷方式后将其余为加载完的应用布局在第一层。
Launcher3\src\com\android\launcher3\LauncherModel.java:
LauncherModel$LoaderTask –> run():
public void run() {
... ...
// Optimize for end-user experience: if the Launcher is up and // running with the
// All Apps interface in the foreground, load All Apps first. Otherwise, load the
// workspace first (default).
keep_running: {
if (DEBUG_LOADERS) Log.d(TAG, "step 1: loading workspace");
loadAndBindWorkspace();
if (mStopped) {
LauncherLog.i(TAG, "LoadTask break in the middle, this = " + this);
break keep_running;
}
waitForIdle();
// second step
if (DEBUG_LOADERS) Log.d(TAG, "step 2: loading all apps");
loadAndBindAllApps();
//添加 @{
if (LauncherAppState.isDisableAllApps()) {
verifyApplications();
}
//添加 }@
}
// Clear out this reference, otherwise we end up holding it until all of the
// callback runnables are done.
... ...
}添加verifyApplications()：
private void verifyApplications() {
final Context context = mApp.getContext();
// Cross reference all the applications in our apps list with items in the workspace
ArrayList tmpInfos;
ArrayList added = new ArrayList();
synchronized (sBgLock) {
for (AppInfo app : mBgAllAppsList.data) {
tmpInfos = getItemInfoForComponentName(app.componentName, app.user);
if (tmpInfos.isEmpty()) {
// We are missing an application icon, so add this to the workspace
added.add(app);
// This is a rare event, so lets log it
Log.e(TAG, "Missing Application on load: " + app);
}
}
}
if (!added.isEmpty()) {
addAndBindAddedWorkspaceItems(context, added);//7.0 虽然去掉了去抽屉的代码，但留了这个方法给我们。
}
} 五，有新应用添加时更新Workspace
当安装新应用时，我们需要对左面更新，保证安装的应用添加在第一层上。
Launcher3\src\com\android\launcher3\LauncherModel.java:
LauncherModel$PackageUpdatedTask –> run():
public void run() {
if (!mHasLoaderCompletedOnce) {
// Loader has not yet run.
return;
}
final Context context = mApp.getContext();
... ...
if (added != null) {
// 添加 @{
if(LauncherAppState.isDisableAllApps()){
final ArrayList addedInfos = new ArrayList(added);
addAndBindAddedWorkspaceItems(context, addedInfos);
}else{
// 添加 }@
addAppsToAllApps(context, added);
}
for (AppInfo ai : added) {
addedOrUpdatedApps.put(ai.componentName, ai);
}
}
... ...
} 六，去掉长按时的删除选项
长按时，不该有删除选项 。
DeleteDropTarget.java： 中更改长按时的监听，开始时直接屏蔽删除按钮，后来发现应用自身发出的快捷方式无法删除 所以做了如下处理。
Launcher3\src\com\android\launcher3\DeleteDropTarget.java –>supportsDrop():
public static boolean supportsDrop(Object info) {
//添加 @{
if (LauncherAppState.isDisableAllApps()) {
if (info instanceof ShortcutInfo) {
ShortcutInfo item = (ShortcutInfo) info;
return item.itemType != LauncherSettings.BaseLauncherColumns.ITEM_TYPE_APPLICATION;
}
return info instanceof LauncherAppWidgetInfo;
}
//添加 }@
return (info instanceof ShortcutInfo)
|| (info instanceof LauncherAppWidgetInfo)
|| (info instanceof FolderInfo);
}写在最后
到此，Launcher3去掉应用抽屉的改动已经完成。还有很多我们需要去美化的，就比如HotSeat布局自适应等。