内存清理（根据版本不同）

HTML/XML代码
ActivityManager activityManger=(ActivityManager) this.getSystemService(ACTIVITY_SERVICE);
           List<ActivityManager.RunningAppProcessInfo> list=activityManger.getRunningAppProcesses();
           if(list!=null)
           for(int i=0;i<list.size();i++)
           {
               ActivityManager.RunningAppProcessInfo apinfo=list.get(i);
                
               System.out.println("pid            "+apinfo.pid);
               System.out.println("processName              "+apinfo.processName);
               System.out.println("importance            "+apinfo.importance);
               String[] pkgList=apinfo.pkgList;
                
               if(apinfo.importance>ActivityManager.RunningAppProcessInfo.IMPORTANCE_SERVICE)
               {
                  // Process.killProcess(apinfo.pid);
                   for(int j=0;j<pkgList.length;j++)
                   {
                       //2.2以上是过时的,请用killBackgroundProcesses代替
                       activityManger.restartPackage(pkgList[j]);
                   } 
               }
 
 
 
 
public static ApplicationInfo getInfo(Context context, String name) {
        if (name == null) {
            return null;
        }
 
        for (ApplicationInfo appinfo : appList) {
            if (name.equals(appinfo.processName)) {
                return appinfo;
            }
        }
        return null;
    }
 
    public static void restartPackage(Context context, String packageName) {
        // Log.i("test", "packageName = " + packageName);
        ActivityManager am = (ActivityManager) context
                .getSystemService(Context.ACTIVITY_SERVICE);
        final int apiLevel = Build.VERSION.SDK_INT;
        if (apiLevel <= 7) {
            am.restartPackage(packageName);
        } else {
            am.killBackgroundProcesses(packageName);
            System.out.println("killed packageName is " + packageName);
        }
    }
描述：内在清理RunningAppProcessInfo 得到正在运行的进程信息pkgList:得到该进程下运行的包名importance:该进程的重要程度importance分为几个级别，数值越低就越重要。数值对应的重要性请看api,我判断是大于ActivityManager.RunningAppProcessInfo.IMPORTANCE_SERVICE的都杀掉，一般数值大于ActivityManager.RunningAppProcessInfo.IMPORTANCE_SERVICE的进程都长时间没用或者空进程了。最后通过for循环把包名对应进程杀掉：2.2版本以下的用activityManger.restartPackage(pkgList[j]); 对应权限<uses-permission android:name="android.permission.RESTART_PACKAGES" />2.2以上的用killBackgroundProcesses(包名); 对应权限<uses-permission android:name="android.permission.KILL_BACKGROUND_PROCESSES" />之前我以为可用android.os.Process.killProcess(pid);来杀掉其他进程，后来发觉不行
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