在我的Galaxy S III上,使用logcat我可以非常频繁地看到该过程已经死亡。
(adj 5),(adj 8),(adj 9)和(adj 10)是什么意思?
以下是设备logcat: -
I/ActivityManager( 2258): Process com.google.android.partnersetup (pid 32242) (adj 10) has died.
I/ActivityManager( 2258): Process com.metago.astro (pid 32446) (adj 10) has died.
D/dalvikvm(32602): WAIT_FOR_CONCURRENT_GC blocked 0ms
I/ActivityManager( 2258): Process com.google.android.gms (pid 32272) (adj 10) has died.
I/ActivityManager( 2258): Process com.whatsapp (pid 12041) (adj 8) has died.
D/KeyguardViewMediator( 2258): setHidden false
D/WindowManager( 2258): mInputFocus is not null.
I/ActivityManager( 2258): Process com.sec.spp.push (pid 19839) (adj 8) has died.
I/ActivityManager( 2258): Process com.test.happ.jiffy (pid 556) (adj 5) has died.
答案 0 :(得分:4)
当内存不足时,android系统会杀死一些后台进程,每个进程都有一个表示其重要性的adj值。低优先级进程将首先被杀死。
ProcessList.java中定义的值
class ProcessList {
// The minimum time we allow between crashes, for us to consider this
// application to be bad and stop and its services and reject broadcasts.
static final int MIN_CRASH_INTERVAL = 60*1000;
// OOM adjustments for processes in various states:
// This is a process only hosting activities that are not visible,
// so it can be killed without any disruption.
static final int HIDDEN_APP_MAX_ADJ = 15;
static int HIDDEN_APP_MIN_ADJ = 9;
// The B list of SERVICE_ADJ -- these are the old and decrepit
// services that aren't as shiny and interesting as the ones in the A list.
static final int SERVICE_B_ADJ = 8;
// This is the process of the previous application that the user was in.
// This process is kept above other things, because it is very common to
// switch back to the previous app. This is important both for recent
// task switch (toggling between the two top recent apps) as well as normal
// UI flow such as clicking on a URI in the e-mail app to view in the browser,
// and then pressing back to return to e-mail.
static final int PREVIOUS_APP_ADJ = 7;
// This is a process holding the home application -- we want to try
// avoiding killing it, even if it would normally be in the background,
// because the user interacts with it so much.
static final int HOME_APP_ADJ = 6;
关于android内存管理的更多信息可以参考http://developer.android.com/guide/components/processes-and-threads.html