客户无感知的杀后台机制，当RAM使用率超过60%，自动关闭5分钟未使用的APP
直接上源码 懒得解析 有空再写
//SW wenjie.gu add for sth start private void RamListener(){ new Thread() { public void run(){ while(ProjectConfig.DEFAULT_SUPPORT_RAMCLEAN){ try { getTotalRam(); } catch (Exception e) { e.printStackTrace(); } } } }.start(); } private void getTotalRam() throws Exception { IsKillingPg=true; ActivityManager manager = (ActivityManager) mContext.getSystemService(Context.ACTIVITY_SERVICE); ActivityManager.MemoryInfo info = new ActivityManager.MemoryInfo(); manager.getMemoryInfo(info); long afterMem = getAvailMemory(mContext); double a= info.availMem/1024/1024; double b= info.totalMem/1024/1024; double Tatal = MyMath.percentage(a, b, 2); if (Tatal < 40) { Log.e("wenjie.gu", "getTotalRam ClearUP!"); ClearUP(); Log.w("wenjie.gu", "清理后可用内存百分比为---->: " + Tatal); Thread.sleep (180000); } IsKillingPg=false; } public static class MyMath { private MyMath() { } public static double percentage(double d1, double zs, int dot) { double bs = Math.pow(10.0, toDouble(dot + 2, 0.0)); double cs = Math.pow(10.0, toDouble(dot, 0.0)); double num = 0.0; if (zs > 0) { num = Math.floor(d1 * bs / zs) / cs; } return num; } public static double percentage(int d1, int zs, int dot) { double bs = Math.pow(10.0, toDouble(dot + 2, 0.0)); double cs = Math.pow(10.0, toDouble(dot, 0.0)); double num = 0.0; if (zs > 0) { num = Math.floor(d1 * bs / zs) / cs; } return num; } private static Double toDouble(Object value, Double defaultValue) { if (null == value) { return defaultValue; } return Double.parseDouble(value.toString()); } } private void ClearUP()throws ParseException{ long oneday =86400000; long fivemin =300000; UsageStatsManager usageManager=(UsageStatsManager) mContext.getSystemService(Context.USAGE_STATS_SERVICE); if (usageManager != null && IsKillingPg) { int intervalType = UsageStatsManager.INTERVAL_BEST; List<UsageStats> applicationList = usageManager.queryUsageStats(intervalType,System.currentTimeMillis()-86400000, System.currentTimeMillis()); Log.w("wenjie.gu","现在的时间 ---> "+longToDate(System.currentTimeMillis())); Log.w("wenjie.gu","现在的时间 ---> "+System.currentTimeMillis()); for (UsageStats usageStats : applicationList) { long UnusedTime=(System.currentTimeMillis()-usageStats.getLastTimeUsed()); if(UnusedTime>fivemin && UnusedTime<oneday){ String unusePkname=usageStats.getPackageName(); mList.add(unusePkname); Log.w("wenjie.gu", "最后使用时间为---->"+unusePkname+"时间为--->"+longToDate(usageStats.getLastTimeUsed())); Log.w("wenjie.gu", "最后使用时间为---->"+unusePkname+"时间为--->"+usageStats.getLastTimeUsed()); } } } ActivityManager activityManager = (ActivityManager) mContext.getSystemService(Context.ACTIVITY_SERVICE); List<ActivityManager.RunningAppProcessInfo> appProcessInfos = activityManager.getRunningAppProcesses(); long beforeMem = getAvailMemory(mContext); Log.i("wenjie.gu", "清理前可用内存为 ---->: " + beforeMem); for (ActivityManager.RunningAppProcessInfo appProcessInfo:appProcessInfos) { if(appProcessInfo.processName.contains("com.android.system") ||appProcessInfo.pid==android.os.Process.myPid()) continue; String[] pkNameList=appProcessInfo.pkgList; for(int i=0;i<pkNameList.length;i++){ String pkName=pkNameList[i]; Method method = null; if(!mList.contains(pkName)||isRunningForeground(pkName)){ Log.e("wenjie.gu","进程--->"+pkName+"被排除!不被清理!"); continue; } if(mList.contains(pkName)&&(!pkName.equals("com.huace.landstar"))&&(!pkName.contains("com.android.system"))){ try { method = Class.forName("android.app.ActivityManager").getMethod("forceStopPackage", String.class); method.invoke(activityManager, pkName); Log.e("wenjie.gu","进程--->"+pkName+"被清理!"); } catch (Exception e) { e.printStackTrace(); } } } } Log.i("wenjie.gu", "清理后可用内存为 ---->: " + beforeMem); } private long getAvailMemory(Context context) { ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE); ActivityManager.MemoryInfo mi = new ActivityManager.MemoryInfo(); am.getMemoryInfo(mi); return mi.availMem; } private String formatFileSize(long number){ return Formatter.formatFileSize(mContext, number); } public static Date longToDate(long lo) throws ParseException { SimpleDateFormat sd = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); //long转Date Date date = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(sd.format(new Date(lo))); return date; } private boolean isRunningForeground(String packkname) { ActivityManager am = (ActivityManager) mContext.getSystemService(Context.ACTIVITY_SERVICE); ComponentName cn = am.getRunningTasks(1).get(0).topActivity; String currentPackageName = cn.getPackageName(); if (currentPackageName != null && currentPackageName.equals(packkname)){ return true; } return false; } //SW wenjie.gu add for sth end 标签：gu,ActivityManager,客需,double,long,内存,wenjie,return,Android From： https://www.cnblogs.com/gwj0424/p/16708823.html