Android(安卓)ActivityManager

ActivityManager服务是对Activity管理、运行时功能管理和运行时数据结构的封装，进程(Process)、应用程序/包、服务(Service)、任务(Task)信息等。包括以下功能：

激活／去激活activity
注册／取消注册动态接受intent
发送／取消发送intent
activity生命周期管理（暂停，恢复，停止，销毁等）
activity task管理（前台－>后台，后台－>前台，最近task查询，运行时task查询）
激活／去激活service
激活／去激活provider等

常用内部静态类有：

ActivityManager.MemoryInfo：系统可用内存信息

ActivityManager.RecentTaskInfo：最近的任务信息

ActivityManager.RunningAppProcessInfo：正在运行的进程信息

ActivityManager.RunningServiceInfo：正在运行的服务信息

ActivityManager.RunningTaskInfo：正在运行的任务信息

用法：

1.获取ActivityManager服务：

ActivityManager mActivityManager = (ActivityManager)getSystemService(Context.ACTIVITY_SERVICE);

2.获取内存信息：

MemoryInfo memoryInfo = new MemoryInfo() ;
mActivityManager.getMemoryInfo(memoryInfo);

3.获取正在运行的task信息：

 List runningTaskInfos = mActivityManager.getRunningTasks(Integer.MAX_VALUE);    String cmpNameTemp = null;    if (null != runningTaskInfos)    {        cmpNameTemp = (runningTaskInfos.get(0).topActivity).toString();    }

4.判断android应用是否在前台：

public static boolean isAppOnForeground(Context context)    {        ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);        String packageName = context.getPackageName();        List appTask = activityManager.getRecentTasks(Integer.MAX_VALUE, 1);                if (appTask == null)        {            return false;        }                if (appTask.get(0).baseIntent.toString().contains(packageName))        {            return true;        }        return false;    }

5.获取android手机内安装的所有桌面：

private static List getAllTheLauncher(Context context)    {        List names = null;        PackageManager pkgMgt = context.getPackageManager();        Intent it = new Intent(Intent.ACTION_MAIN);        it.addCategory(Intent.CATEGORY_HOME);        List ra = pkgMgt.queryIntentActivities(it, 0);        if (ra.size() != 0)        {            names = new ArrayList();        }        for (int i = 0; i < ra.size(); i++)        {            String packageName = ra.get(i).activityInfo.packageName;            names.add(packageName);        }        return names;    }

6.判断程序前后台状态：

public static boolean isLauncherRunning(Context context)    {        boolean result = false;        List names = getAllTheLauncher(context);        ActivityManager mActivityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);        List appList = mActivityManager.getRunningAppProcesses();        for (RunningAppProcessInfo running : appList)        {            if (running.importance == RunningAppProcessInfo.IMPORTANCE_FOREGROUND)            {                for (int i = 0; i < names.size(); i++)                {                    if (names.get(i).equals(running.processName))                    {                        result = true;                        break;                    }                }            }        }        return result;    }

7.获取系统中进程信息：

private void getRunningAppProcessInfo() {
processInfoList = new ArrayList();

List appProcessList = mActivityManager.getRunningAppProcesses();

for (ActivityManager.RunningAppProcessInfo appProcessInfo : appProcessList) {

int pid = appProcessInfo.pid;

int uid = appProcessInfo.uid;

String processName = appProcessInfo.processName;

int[] myMempid = new int[] { pid };

Debug.MemoryInfo[] memoryInfo = mActivityManager.getProcessMemoryInfo(myMempid);

int memSize = memoryInfo[0].dalvikPrivateDirty;

Log.i(TAG, "processName: " + processName + " pid: " + pid

+ " uid:" + uid + " memorySize is -->" + memSize + "kb");

// 构造一个ProcessInfo对象

ProcessInfo processInfo = new ProcessInfo();

processInfo.setPid(pid);

processInfo.setUid(uid);

processInfo.setMemSize(memSize);

processInfo.setPocessName(processName);

processInfoList.add(processInfo);

// 获得每个进程里运行的应用程序(包),即每个应用程序的包名

String[] packageList = appProcessInfo.pkgList;

Log.i(TAG, "process id is " + pid + "has " + packageList.length);

for (String pkg : packageList) {

Log.i(TAG, "packageName " + pkg + " in process id is -->"+ pid);

}

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