得到栈顶的activity

1. 得到当前运行环境(context)的Activity管理器；

2. 通过Activity管理器得到当前的任务栈信息；

3. 从任务栈中获得栈顶的Activity的名称。

String getTopActivity(Activity context)

{

ActivityManager manager = (ActivityManager)context.getSystemService(ACTIVITY_SERVICE) ;

List runningTaskInfos = manager.getRunningTasks(1) ;



if(runningTaskInfos != null)

return (runningTaskInfos.get(0).topActivity).toString() ;

else

return null ;

}

最后不要忘记在AndroidManifest.xml中增加权限：




检测某ActivityUpdate是否在当前Task的栈顶
public static boolean isTopActivy(String cmdName, Context context)
{
ActivityManager manager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
List runningTaskInfos = manager.getRunningTasks(Integer.MAX_VALUE);
String cmpNameTemp = null;
if (null != runningTaskInfos)
{
cmpNameTemp = (runningTaskInfos.get(0).topActivity).toString();
}

if (null == cmpNameTemp)
{
return false;
}

return cmpNameTemp.equals(cmdName);

}


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;
}


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;
}

Android 判断程序前后台状态
public static boolean isLauncherRunnig(Context context)
{
boolean result = false;
List names = getAllTheLauncher(context);
ActivityManager mActivityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
List

tivityManager.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;
}