android进程死了(adj *),什么是adj？

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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.

解决方法:

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;

有关android内存管理的更多信息可以参考http://developer.android.com/guide/components/processes-and-threads.html

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