Android 7.0 Launcher3 去掉應用抽屜
年初做過一個專案，有一個需求就是需要將桌面變為單層不需要二級選單。最近幾次有小夥伴有這個問我這個解決辦法。現在我將分享給大家。
先上效果圖：
功能分解
- 去除Allapp鍵，調整HotSeat佈局
- 將所有應用擺在launcher第一層
- 去掉長按時刪除選項
解決方案
一，設定總開關
按照6.0 Launcher3 的模式，新增一個開關，控制是否去掉抽屜。
LauncherAppState類：單例模式，主要在啟動的時候用，他初始化了一些物件，並且註冊了廣播監聽器和ContentObserver。為了能靈活切換模式,在此類中新增靜態開關。
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鍵的載入
在HotSeat裡面去掉Allapp鍵的載入 ，遮蔽isAllAppsButtonRank()佔用allapp位置。
1) 不再佔用allapp位置
2) 在載入Workspace時,會留出HotSeat的第三個位置給allapp按鈕,若不取消該位置的佔用,在HotSeat載入時會留出空位。HotSeat的初始化在HotSeat.java中
Launcher3\src\com\android\launcher3\HotSeat.java –>isAllAppsButtonRank()：
public boolean isAllAppsButtonRank(int rank) {
//新增 @{
if (LauncherAppState.isDisableAllApps()) {
return false;
}
//新增 @}
return rank == mAllAppsButtonRank;
}3) Home2沒有抽屜，所以不需要allapp按鈕。在HotSeat裡面去掉Allapp鍵的載入，在HotSeat.java 的void resetLayout()中初始化HotSeat佈局。在Home2時停止載入Allapp按鈕。
Launcher3\src\com\android\launcher3\HotSeat.java –>resetLayout():
void resetLayout() {
mContent.removeAllViewsInLayout();
//新增 @{
if(LauncherAppState.isDisableAllApps()){
//新增 }@
// 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);
}
}//別漏了這裡的 }三，資料初始化類中更改HotSeat佈局
InvariantDeviceProfile.java Launcher3進行佈局初始化的一個類。
在有allapp按鈕時HotSeat裡Hotseat圖示數量為五個，沒有allapp按鈕時Hotseat圖示數量應為四個。
Launcher3\src\com\android\launcher3\InvariantDeviceProfile.java:
1）先加個巨集控
//新增 @{
private boolean hasDA = LauncherAppState.isDisableAllApps();
//新增 }@2)去掉抽屜時，HotSeat的格數為四格，所以不能丟擲異常。 （ numHotseatIcons 為偶時不拋異常）
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) {// 在無抽屜情況下不拋異常
throw new RuntimeException("All Device Profiles must have an odd number of hotseat spaces");
}
name = n;
... ...
}3）去掉抽屜的情況下載入不同的佈局
getPredefinedDeviceProfiles() :
ArrayList<InvariantDeviceProfile> getPredefinedDeviceProfiles() {
ArrayList<InvariantDeviceProfile> 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)記得改下 dw_phone_hotseat.xml 的佈局 ，因為Hotseat只有5格了。
四，將所有應用放在第一層
launcher3載入流程：進入 LauncherApplication -> LauncherAppState -> 進行初始化環境（通過傳遞sContext）。進行事件監聽&&初始化一些環境。例如：橫豎屏、當局語言、畫素密度、小部件和快捷圖示資料庫操作物件、應用圖示快取物件、初始化LauncherMode等。在初始化過後，從Launcher的Oncreate方法入手。mModel.startLoader(mWorkspace.getRestorePage());里加載資料 。在載入完成所有快捷方式後將其餘為載入完的應用佈局在第一層。
1) 成所有快捷方式後將其餘為載入完的應用佈局在第一層。
Launcher3\src\com\android\launcher3\LauncherModel.java:
LauncherModel$LoaderTask –> run():
public void run() {
... ...
// Optimize for end-user experience: if the Launcher is up and // running with the
// All Apps interface in the foreground, load All Apps first. Otherwise, load the
// workspace first (default).
keep_running: {
if (DEBUG_LOADERS) Log.d(TAG, "step 1: loading workspace");
loadAndBindWorkspace();
if (mStopped) {
LauncherLog.i(TAG, "LoadTask break in the middle, this = " + this);
break keep_running;
}
waitForIdle();
// second step
if (DEBUG_LOADERS) Log.d(TAG, "step 2: loading all apps");
loadAndBindAllApps();
//新增 @{
if (LauncherAppState.isDisableAllApps()) {
verifyApplications();
}
//新增 }@
}
// Clear out this reference, otherwise we end up holding it until all of the
// callback runnables are done.
... ...
}新增verifyApplications()：
private void verifyApplications() {
final Context context = mApp.getContext();
// Cross reference all the applications in our apps list with items in the workspace
ArrayList<ItemInfo> tmpInfos;
ArrayList<ItemInfo> added = new ArrayList<ItemInfo>();
synchronized (sBgLock) {
for (AppInfo app : mBgAllAppsList.data) {
tmpInfos = getItemInfoForComponentName(app.componentName, app.user);
if (tmpInfos.isEmpty()) {
// We are missing an application icon, so add this to the workspace
added.add(app);
// This is a rare event, so lets log it
Log.e(TAG, "Missing Application on load: " + app);
}
}
}
if (!added.isEmpty()) {
addAndBindAddedWorkspaceItems(context, added);//7.0 雖然去掉了去抽屜的程式碼，但留了這個方法給我們。
}
}五，有新應用新增時更新Workspace
當安裝新應用時，我們需要對左面更新，保證安裝的應用新增在第一層上。
Launcher3\src\com\android\launcher3\LauncherModel.java:
LauncherModel$PackageUpdatedTask –> run():
public void run() {
if (!mHasLoaderCompletedOnce) {
// Loader has not yet run.
return;
}
final Context context = mApp.getContext();
... ...
if (added != null) {
// 新增 @{
if(LauncherAppState.isDisableAllApps()){
final ArrayList<ItemInfo> addedInfos = new ArrayList<ItemInfo>(added);
addAndBindAddedWorkspaceItems(context, addedInfos);
}else{
// 新增 }@
addAppsToAllApps(context, added);
}
for (AppInfo ai : added) {
addedOrUpdatedApps.put(ai.componentName, ai);
}
}
... ...
}六，去掉長按時的刪除選項
長按時，不該有刪除選項 。
DeleteDropTarget.java： 中更改長按時的監聽，開始時直接遮蔽刪除按鈕，後來發現應用自身發出的快捷方式無法刪除 所以做了如下處理。
Launcher3\src\com\android\launcher3\DeleteDropTarget.java –>supportsDrop():
public static boolean supportsDrop(Object info) {
//新增 @{
if (LauncherAppState.isDisableAllApps()) {
if (info instanceof ShortcutInfo) {
ShortcutInfo item = (ShortcutInfo) info;
return item.itemType != LauncherSettings.BaseLauncherColumns.ITEM_TYPE_APPLICATION;
}
return info instanceof LauncherAppWidgetInfo;
}
//新增 }@
return (info instanceof ShortcutInfo)
|| (info instanceof LauncherAppWidgetInfo)
|| (info instanceof FolderInfo);
}寫在最後
到此，Launcher3去掉應用抽屜的改動已經完成。還有很多我們需要去美化的，就比如HotSeat佈局自適應等。