android:persistent=true作用

android:persistent="true"作用
针对系统级别的应用，在启动home之前启动，即随着系统开机启动

public void systemReady(final Runnable goingCallback, TimingsTraceLog traceLog) {...synchronized (this) {// Only start up encryption-aware persistent apps; once user is// unlocked we'll come back around and start unaware appsstartPersistentApps(PackageManager.MATCH_DIRECT_BOOT_AWARE);// Start up initial activity.mBooting = true;// Enable home activity for system user, so that the system can always boot. We don't// do this when the system user is not setup since the setup wizard should be the one// to handle home activity in this case.if (UserManager.isSplitSystemUser() &&Settings.Secure.getInt(mContext.getContentResolver(),Settings.Secure.USER_SETUP_COMPLETE, 0) != 0) {ComponentName cName = new ComponentName(mContext, SystemUserHomeActivity.class);try {AppGlobals.getPackageManager().setComponentEnabledSetting(cName,PackageManager.COMPONENT_ENABLED_STATE_ENABLED, 0,UserHandle.USER_SYSTEM);} catch (RemoteException e) {throw e.rethrowAsRuntimeException();}}startHomeActivityLocked(currentUserId, "systemReady");try {if (AppGlobals.getPackageManager().hasSystemUidErrors()) {Slog.e(TAG, "UIDs on the system are inconsistent, you need to wipe your"+ " data partition or your device will be unstable.");mUiHandler.obtainMessage(SHOW_UID_ERROR_UI_MSG).sendToTarget();}} catch (RemoteException e) {}

当此应用异常被杀死后，系统会restart此应用，即应用的包活性。

 private final boolean attachApplicationLocked(IApplicationThread thread,int pid, int callingUid, long startSeq) {...final String processName = app.processName;try {AppDeathRecipient adr = new AppDeathRecipient(app, pid, thread);thread.asBinder().linkToDeath(adr, 0);app.deathRecipient = adr;} catch (RemoteException e) {app.resetPackageList(mProcessStats);startProcessLocked(app, "link fail", processName);return false;}...}            private final class AppDeathRecipient implements IBinder.DeathRecipient {final ProcessRecord mApp;final int mPid;final IApplicationThread mAppThread;AppDeathRecipient(ProcessRecord app, int pid,IApplicationThread thread) {if (DEBUG_ALL) Slog.v(TAG, "New death recipient " + this+ " for thread " + thread.asBinder());mApp = app;mPid = pid;mAppThread = thread;}@Overridepublic void binderDied() {if (DEBUG_ALL) Slog.v(TAG, "Death received in " + this+ " for thread " + mAppThread.asBinder());synchronized(ActivityManagerService.this) {appDiedLocked(mApp, mPid, mAppThread, true);}}}   @GuardedBy("this")private final boolean cleanUpApplicationRecordLocked(ProcessRecord app,boolean restarting, boolean allowRestart, int index, boolean replacingPid) {    ...} else if (!app.removed) {// This app is persistent, so we need to keep its record around.// If it is not already on the pending app list, add it there// and start a new process for it.if (mPersistentStartingProcesses.indexOf(app) < 0) {mPersistentStartingProcesses.add(app);restart = true;}}if ((DEBUG_PROCESSES || DEBUG_CLEANUP) && mProcessesOnHold.contains(app)) Slog.v(TAG_CLEANUP, "Clean-up removing on hold: " + app);mProcessesOnHold.remove(app);if (app == mHomeProcess) {mHomeProcess = null;}if (app == mPreviousProcess) {mPreviousProcess = null;}if (restart && !app.isolated) {// We have components that still need to be running in the// process, so re-launch it.if (index < 0) {ProcessList.remove(app.pid);}addProcessNameLocked(app);app.pendingStart = false;startProcessLocked(app, "restart", app.processName);return true;

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android:persistent=true作用

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