ActivityManager am = (ActivityManager)context.getSystemService(Context.ACTIVITY_SERVICE);
List<RunningTaskInfo> list = am.getRunningTasks(100);
for (RunningTaskInfo info : list) {
  if (info.topActivity.getPackageName().equals(MY_PKG_NAME) && info.baseActivity.getPackageName().equals(MY_PKG_NAME)) {
    isAppRunning = true;
    //find it, break
    break;
  }
}

<uses-permission android:name="android.permission.GET_TASKS" />

/**
* 判断应用是否在运行
* @param context
* @return
*/
public boolean isRun(Context context){
    ActivityManager am = (ActivityManager)context.getSystemService(Context.ACTIVITY_SERVICE);
    List<RunningTaskInfo> list = am.getRunningTasks(100);
    boolean isAppRunning = false;
    String MY_PKG_NAME = "com.ad";
    //100表示取的最大的任务数，info.topActivity表示当前正在运行的Activity，info.baseActivity表系统后台有此进程在运行
    for (RunningTaskInfo info : list) {
      if (info.topActivity.getPackageName().equals(MY_PKG_NAME) || info.baseActivity.getPackageName().equals(MY_PKG_NAME)) {
        isAppRunning = true;
        Log.i("ActivityService isRun()",info.topActivity.getPackageName() + " info.baseActivity.getPackageName()="+info.baseActivity.getPackageName());
        break;
      }
    }
    Log.i("ActivityService isRun()", "com.ad 程序  ...isAppRunning......"+isAppRunning);
    return isAppRunning;
}

ActivityManager activityManager = (ActivityManager)this.getSystemService(ACTIVITY_SERVICE)
ConfigurationInfo configurationInfo = activityManager.getDeviceConfigurationInfo();

Debug.MemoryInfo[] processMemoryInfo = activityManager.getProcessMemoryInfo(processIds)

List<RunningServiceInfo> runningServiceInfos = activityManager.getRunningServices(MaxValue);

List<RunningTaskInfo> runningTaskInfos = activityManager.getRunningTasks(MaxValue); 

/**
* 检测某ActivityUpdate是否在当前Task的栈顶
*/
public boolean isTopActivy(String cmdName){
    ActivityManager manager = (ActivityManager) context.getSystemService(ACTIVITY_SERVICE);
    List<RunningTaskInfo> runningTaskInfos = manager.getRunningTasks(1);
    String cmpNameTemp = null;
    if(null != runningTaskInfos){
        cmpNameTemp=(runningTaskInfos.get(0).topActivity).toString);
        Log.e("cmpname","cmpname:"+cmpName);
    }
    if(null == cmpNameTemp)return false;
    return cmpNameTemp.equals(cmdName);
}

/**get the launcher status */
private boolean isLauncherRunnig(Context context) {
   boolean result = false ;
   List<String> names = getAllTheLauncher();
   ActivityManager mActivityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE) ;
   List<ActivityManager.RunningAppProcessInfo> 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 ;
}

/**
* 得到所有的Launcher
*/
private List<String> getAllTheLauncher(){
    List<String> names = null;
    PackageManager pkgMgt = this.getPackageManager();
    Intent it = new Intent(Intent.ACTION_MAIN);
    it.addCategory(Intent.CATEGORY_HOME);
    List<ResolveInfo> ra =pkgMgt.queryIntentActivities(it,0);
    if(ra.size() != 0){
      names = new ArrayList<String>();
    }
    for(int i=0;i< ra.size();i++)
    {
    String packageName = ra.get(i).activityInfo.packageName;
    names.add(packageName);
    }
    return names;
}

ActivityManager am = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
ComponentName cn = am.getRunningTasks(1).get(0).topActivity;
Log.d("", "pkg:"+cn.getPackageName());
Log.d("", "cls:"+cn.getClassName());

private boolean isTopActivity(){
    List<RunningTaskInfo> tasksInfo = activityManager.getRunningTasks(1);
    if(tasksInfo.size() > 0){
      //应用程序位于堆栈的顶层
      if(packageName.equals(tasksInfo.get(0).topActivity.getPackageName())){
        return true;
      }
    }
    return false;
}