概述
在某些场景下,我们想让某些app能一直在前台或者后台运行,而不被Android系统杀死.这时就涉及到了应用保活.应用保活可以从两个方向来实现,一个是应用层,一个是系统层.
Android系统进程优先级
应用保活从本质上来讲就是提高进程的优先级.详细可以参考以下博客:
https://www.jianshu.com/p/4ee14aa23f07
下面是Android定义的ADJ值.
在这里插入图片描述
应用保活
对用开发app的公司来说,由于没有系统源码,所以只能从app层面来考虑保活;但是对于rom定制厂商来说就可以从系统层实现app保活.
应用层方式
应用层保活可以参考下面的博客:
https://blog.csdn.net/qq_30993595/article/details/90678273
该博客详细介绍了几种主流的应用保活方式.
系统层方式
对于没有白名单机制的Android版本
--- a/frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java
+++ b/frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java
@@ -518,6 +518,9 @@ public class ActivityManagerService extends IActivityManager.Stub
static final String SYSTEM_DEBUGGABLE = "ro.debuggable";
+ // hefang add for disable kill service
+ public static final boolean EMDOOR_IMORAN_APPS_SUPPORT = (SystemProperties.get("ro.emdoor_imoran_apps_support", "0").equals("1"));
+
/// M: log enhancement @{
static final boolean IS_USER_DEBUG_BUILD = "userdebug".equals(Build.TYPE);
static final boolean IS_USER_BUILD = "user".equals(Build.TYPE) || IS_USER_DEBUG_BUILD;
@@ -22211,10 +22214,29 @@ public class ActivityManagerService extends IActivityManager.Stub
int changes = 0;
if (app.curAdj != app.setAdj) {
+ // hefang add for disable kill service
+ if(EMDOOR_IMORAN_APPS_SUPPORT) {
+ String PKG_MORAPP = "net.imoran.main.launcher";
+ String PKG_MORSPEAKER = "net.imoran.voice";
+ String PKG_DOCTOR= "com.joyhealth.intelligencefamilydoctor";
+ String[] packages = app.getPackageList();
+ if(packages != null) {
+ for(String p : packages) {
+ if(p.equals(PKG_MORAPP)
+ ||p.equals(PKG_MORSPEAKER)
+ ||p.equals(PKG_DOCTOR)) {
+ android.util.Log.d("hefang_lowKill", "set adj -1");
+ app.curAdj = -1;
+ break;
+ }
+ }
+ }
+ }
+ //add end
ProcessList.setOomAdj(app.pid, app.uid, app.curAdj);
if (DEBUG_SWITCH || DEBUG_OOM_ADJ || mCurOomAdjUid == app.info.uid) {
String msg = "Set " + app.pid + " " + app.processName + " adj "
- + app.curAdj + ": " + app.adjType;
+ + app.curAdj + ": " + app.adjType;
reportOomAdjMessageLocked(TAG_OOM_ADJ, msg);
}
app.setAdj = app.curAdj;
对于有白名单机制的Android版本:
--- /dev/null
+++ b/vendor/emdoor/imoran/configuration.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+ <PlatformWhitelist>
+ <App1>net.imoran.voice</App1>
+ <App2>net.imoran.main.launcher</App2>
+ <App3>com.joyhealth.intelligencefamilydoctor</App3>
+ </PlatformWhitelist>
+</configuration>
diff --git a/vendor/emdoor/imoran/imoran.mk b/vendor/emdoor/imoran/imoran.mk
index 64291b9..ccbb349 100755
--- a/vendor/emdoor/imoran/imoran.mk
+++ b/vendor/emdoor/imoran/imoran.mk
@@ -18,3 +18,4 @@ PRODUCT_PACKAGES += $(MODULE_MORAPP)
#$(shell cp vendor/emdoor/imoran/$(MODULE_MORAPP)/lib out/target/product/$(MTK_TARGET_PROJECT)/obj/APPS/$(MODULE_MORAPP)/lib/arm)
PRODUCT_COPY_FILES += $(call find-copy-subdir-files,*,vendor/emdoor/imoran/$(MODULE_MORAPP)/lib,system/app/$(MODULE_MORAPP)/lib/arm)
+PRODUCT_COPY_FILES += vendor/emdoor/imoran/configuration.xml:system/etc/imoran/configuration.xml
查看进程的adj值
adb shell
ps|grep "进程名"
cat /proc/进程名对应PID/oom_adj
