本文实例讲述了Android7.0开发实现Launcher3去掉应用抽屉的方法。分享给大家供大家参考,具体如下:
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
1. 去除Allapp键,调整HotSeat布局
2. 将所有应用摆在launcher第一层
3. 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() :
ArrayListgetPredefinedDeviceProfiles() { 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 &#63; 4 : 5), 48, (hasDA &#63; 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 &#63; 4 : 5), 48, (hasDA &#63; 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 &#63; 4 : 5), 48, (hasDA &#63; 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 &#63; 4 : 5), 56, (hasDA &#63; 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 &#63; 4 : 5), 56, (hasDA &#63; 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$LoaderTask –> run():
public void run() { ... ... // Optimize for end-user experience: if the Launcher is up and // running with the // All Apps interface in the foreground, load All Apps first. Otherwise, load the // workspace first (default). keep_running: { if (DEBUG_LOADERS) Log.d(TAG, "step 1: loading workspace"); loadAndBindWorkspace(); if (mStopped) { LauncherLog.i(TAG, "LoadTask break in the middle, this = " + this); break keep_running; } waitForIdle(); // second step if (DEBUG_LOADERS) Log.d(TAG, "step 2: loading all apps"); loadAndBindAllApps(); //添加 @{ if (LauncherAppState.isDisableAllApps()) { verifyApplications(); } //添加 }@ } // Clear out this reference, otherwise we end up holding it until all of the // callback runnables are done. ... ... }
添加verifyApplications():
private void verifyApplications() { final Context cOntext= mApp.getContext(); // Cross reference all the applications in our apps list with items in the workspace ArrayListtmpInfos; ArrayList added = new ArrayList (); synchronized (sBgLock) { for (AppInfo app : mBgAllAppsList.data) { tmpInfos = getItemInfoForComponentName(app.componentName, app.user); if (tmpInfos.isEmpty()) { // We are missing an application icon, so add this to the workspace added.add(app); // This is a rare event, so lets log it Log.e(TAG, "Missing Application on load: " + app); } } } if (!added.isEmpty()) { addAndBindAddedWorkspaceItems(context, added);//7.0 虽然去掉了去抽屉的代码,但留了这个方法给我们。 } }
五、有新应用添加时更新Workspace
当安装新应用时,我们需要对左面更新,保证安装的应用添加在第一层上。
Launcher3\src\com\android\launcher3\LauncherModel.java:
LauncherModel$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 ArrayListaddedInfos = 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。
更多关于Android相关内容感兴趣的读者可查看本站专题:《Android窗口相关操作技巧总结》、《Android开发入门与进阶教程》、《Android调试技巧与常见问题解决方法汇总》、《Android基本组件用法总结》、《Android视图View技巧总结》、《Android布局layout技巧总结》及《Android控件用法总结》
希望本文所述对大家Android程序设计有所帮助。