Android11.0内置第三方Launcher并设置为默认，保留Launcher3并可切换
- Android11.0内置第三方Launcher并设置为默认，保留Launcher3并可切换
Android11.0内置第三方Launcher并设置为默认，保留Launcher3并可切换
本文描述Android11中内置第三方应用为Launcher并保住自带的Launcher3，刷机后系统启动时选择内置第三方应用显示并设置为默认Launcher。
（图片来源网络，侵删）persist.sys.def_launcher= persist.sys.def_launcher_enable=false
- 在具体的产品中设置自定义属性，例如在rk3568_r中，修改路径：
/device/rockchip/rk356x/rk3568_r/rk3568_r.mk
PRODUCT_PROPERTY_OVERRIDES += persist.sys.def_launcher=com.yjz.launcher PRODUCT_PROPERTY_OVERRIDES += persist.sys.def_launcher_enable=true
- 选择并设置为默认launcher，修改路径 /frameworks/base/core/java/com/android/internal/app/ResolverActivity.java；
public final void onPostListReady(ResolverListAdapter listAdapter, boolean doPostProcessing, boolean rebuildCompleted) { if (isAutolaunching()) { return; } //新增 if (rebuildCompleted && hasSetDefLauncher()) { return; } //*******省略代码****** } final boolean postRebuildListInternal(boolean rebuildCompleted) { //*******省略代码****** //添加 if (rebuildCompleted && (hasSetDefLauncher() || maybeAutolaunchActivity())) { return true; } //*******省略代码****** } //添加 private boolean hasSetDefLauncher() { if (SystemProperties.getBoolean("persist.sys.def_launcher_enable", false)) { String defLauncher = SystemProperties.get("persist.sys.def_launcher", null); if (defLauncher != null && !"".equals(defLauncher)) { int size = mMultiProfilePagerAdapter.getActiveListAdapter().getDisplayResolveInfoCount(); for (int i = 0; i " + dInfo.getResolveInfo().activityInfo.packageName); startSelected(i, true, false); return true; } } } } return false; }- ResolverActivity里系统中有多个launcher时，是异步查询并通过onPostListReady()方法回调回来在进行设置，这时可能有弹窗闪一下，ResolverListAdapter可以对查询数据逻辑处理只返回内置应用一条数据，ResolverActivity中通过postRebuildListInternal()处理，修改路径：
/frameworks/base/core/java/com/android/internal/app/ResolverListAdapter.java；
protected boolean rebuildList(boolean doPostProcessing) { //********省略代码****** if (mBaseResolveList != null) { currentResolveList = mUnfilteredResolveList = new ArrayList(); mResolverListController.addResolveListDedupe(currentResolveList, mResolverListCommunicator.getTargetIntent(), mBaseResolveList); } else { currentResolveList = mUnfilteredResolveList = mResolverListController.getResolversForIntent( /* shouldGetResolvedFilter= */ true, mResolverListCommunicator.shouldGetActivityMetadata(), mIntents); if (currentResolveList == null) { processSortedList(currentResolveList, doPostProcessing); return true; } List originalList = mResolverListController.filterIneligibleActivities(currentResolveList, true); if (originalList != null) { mUnfilteredResolveList = originalList; } } //添加 if (null != currentResolveList && SystemProperties.getBoolean("persist.sys.def_launcher_enable", false)) { String defLauncher = SystemProperties.get("persist.sys.def_launcher", null); if (defLauncher != null && !"".equals(defLauncher)) { for (ResolvedComponentInfo info : currentResolveList) { ResolveInfo resolveInfo = info.getResolveInfoAt(0); if (defLauncher.equals(resolveInfo.activityInfo.packageName)) { currentResolveList = new ArrayList(); currentResolveList.add(info); Log.d(TAG, "find set default launcher--->" + resolveInfo.activityInfo.packageName); break; } } } } //********省略代码****** // So far we only support a single other profile at a time. // The first one we see gets special treatment. }- 如果当前为Launcher3显示 ，在设置-应用–默认应用-主屏幕应用中，切换设置默认为第三方Launcher应用，在第三方应用中，点击导航栏返回按键时，会返回到Launcher3，是因为切换设置默认launcher后，前一个的任务栈还存在，需要删除，修改路径： /packages/apps/PermissionController/src/com/android/permissioncontroller/role/model/HomeRoleBehavior.java；
//********省略代码****** @Override public void onHolderSelectedAsUser(@NonNull Role role, @NonNull String packageName, @NonNull UserHandle user, @NonNull Context context) { // Launch the new home app so the change is immediately visible even if the home button is // not pressed. //这里是发送一个广播到自定义服务中去删除旧的任务栈 Intent it = new Intent("com.yjz.ACTION_SET_DEF_LAUNCHER_ENABLE"); it.putExtra("packageName", packageName); context.sendBroadcast(it); Intent intent = new Intent(Intent.ACTION_MAIN) .addCategory(Intent.CATEGORY_HOME) .setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); context.startActivity(intent); } //********省略代码****** }- 自定义服务中清除旧任务栈逻辑：
//********省略代码****** private class CustomReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { String action = intent.getAction(); if ("com.yjz.ACTION_SET_DEF_LAUNCHER_ENABLE".equals(action)) { String packageName = intent.getStringExtra("packageName"); if (null != packageName && !"".equals(packageName)) { String defLauncher = SystemProperties.get("persist.sys.def_launcher", null); if (defLauncher != null && !"".equals(defLauncher) && defLauncher.equals(packageName)) { SystemProperties.set("persist.sys.def_launcher_enable", "true"); } else { SystemProperties.set("persist.sys.def_launcher_enable", "false"); } clearOldLauncherTask(packageName, context); } } } } private void clearOldLauncherTask(String packageName, Context context) { ActivityManager manager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE); List list = manager.getRunningTasks(Integer.MAX_VALUE); if (null != list) { for (ActivityManager.RunningTaskInfo item : list) { if (item.configuration.windowConfiguration.getActivityType() == WindowConfiguration.ACTIVITY_TYPE_HOME) { if (!item.realActivity.getPackageName().equals(packageName)) { final int tId = item.taskId; try { ActivityTaskManager.getService().removeTask(tId); } catch (RemoteException e) { Log.w(TAG, "Failed to remove task=" + tId, e); } } } } } }- 添加内置第三方应用launcher，在vendor/yjz/launcher/下放置应用及Android.mk
/vendor/yjz/launcher/Android.mk
LOCAL_PATH := $(call my-dir) include $(CLEAR_VARS) LOCAL_MODULE := YJZLauncher LOCAL_MODULE_CLASS := APPS LOCAL_MODULE_TAGS := optional LOCAL_SRC_FILES := $(LOCAL_MODULE).apk LOCAL_MODULE_SUFFIX := $(COMMON_ANDROID_PACKAGE_SUFFIX) LOCAL_CERTIFICATE := PRESIGNED include $(BUILD_PREBUILT)
- 添加YJZLauncher到编译系统里
/device/rockchip/rk356x/rk3568_r/rk3568_r.mk
PRODUCT_PACKAGES += YJZLauncher
- 编译刷机验证
（图片来源网络，侵删） - 在具体的产品中设置自定义属性，例如在rk3568_r中，修改路径：
